Guide to Ultrasonic Level Transmitters-for Continuous Non Contact Level Measurement of Liquid & Solids.

Posted on July 10, 2019 by KimGuo11

What is an Ultrasonic level transmitter?

Ultrasonic Level Transmitters & Ultrasonic Level Sensors are designed to provide accurate and reliable level sensing for difficult to monitor fluids, where contact with media is not desirable from the extremes of sending: ultrapure to corrosive or even dirty where coating or scaling is possible. Ultrasonic level transmitters have no moving parts, are easy to install and simple to use.

Ultrasonic level measurement provides continuous, non-contact and maintenance-free level measurement of fluids, pastes, sludges and powdery to coarse bulk materials. The measurement is unaffected by dielectric constant, density or humidity and also unaffected by build-up due to the self-cleaning effect of the sensors.

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The basics of ultrasonic level transmitters – how they work and what they’re used for

Ultrasonic Level Transmitters working principle

The Ultrasonic Level Transmitter consists of three parts: ultrasonic transducer (probe), drive circuit (module), and electronic display module.

The Ultrasonic Sensor is installed on the storage tank or process vessel. The sensor sends out a sound wave, which ricochets off the surface of the liquid and returns to the sensor. The time it takes for the sound wave to travel from the sensor to the liquid surface and return to the sensor is measured. This time delay is proportional to the level of the liquid.

The drive circuit processes the signal from the Ultrasonic Sensor, compensates for adverse conditions (temperature, pressure, etc) and converts it into a standard 4-20mA or 0-5/10 Vdc signal that can be read by a PLC, DCS or Display/Transmitter.

The Display/Transmitter converts the 4-20mA or 0-5/10 Vdc signal into a display reading in the unit of measure required (feet, inches, meters, centimeters, etc). Ultrasonic level transmitters can be outfitted with local displays and push button controls for easy configuration without the need of a laptop or other computer.

Applications

Ultrasonic level transmitters are used for inventory management and process automation in a wide range of industries. Applications include:

Food & Beverage
Water & Waste Water
Chemical
Petroleum
Pharmaceutical

Read more about: Ultrasonic Level Sensor Applications

Featured Ultrasonic level transmitters

Model	Integrated Model	Split model
Pictures
Measuring range	5m、10m、15m、20m、30m	5m、10m、15m、20m、30m
Accuracy	0.5%~1.0%	0.5%~1.0%
Resolution	3mm or 0.1% (choose the bigger)	3mm or 0.1% (choose the bigger)
Display	LCD	LCD
Analog output	4 wire system 4~20mA/510Q loading 2 wire system 4~20mA/250Q loading	4~20mA/510Q loading
Relay output	2 sets of AC 250V/ 8A or DC 30V/ 5A are optional, state is programmable	2 sets of single-channel are (optional), the double channel is 4 sets of AC 250V/ 8A or DC 30V/ 5A, the state is programmable
Power supply	Standard: 24VDC Optional: 220VAC + 15% 50Hz	Standard: 220V AC + 15% 50Hz Optional: 24VDC 120m Customized 12VDC or battery-powered
Environmental temperature	Meter display -20 ~ +60°C Probe -20~+80°C	Meter display -20~ +60°C Probe-20~+80°C
Communication	Optional 485,232 communication (manufacturer agreement)	Optional 485, 232 communication (manufacturer agreement)
Protection class	Display meter IP65, Probe Ip68	Display meter IP65, Probe Ip68
Probe cable	No	100m reachable, standard 10m
Probe installation	Selection based on measuring range and probe	Selection based on measuring range and probe

Ultrasonic level transmitter data sheet

Ultrasonic-Level-Meters-Catalogue

Extended reading: liquid nitrogen level sensor

The benefits of using an ultrasonic level transmitter

– Ultrasonic level transmitters are easy to install and simple to use.

– Ultrasonic level measurement provides continuous, non-contact and maintenance-free level measurement of fluids, pastes, sludges and powdery to coarse bulk materials.

– Ultrasonic level transmitters are unaffected by dielectric constant, density or humidity and also unaffected by build-up due to the self-cleaning effect of the sensors.

Sino-Inst offers a wide range of Ultrasonic Level Transmitters that can be used in various industries for inventory management and process automation. If you have any questions about which Ultrasonic Level Transmitter is right for your application, please contact us and we will be happy to assist you.

How to choose the right ultrasonic level transmitter for your needs

1. The ultrasonic level meter can only be used for the medium that can fully reflect sound waves and propagate sound waves. For the sound wave adsorption ability of the medium, it is not suitable to use ultrasonic level meter.

2. The ultrasonic level meter can not be applied to vacuum occasions, and not for negative pressure occasions. Because the propagation of ultrasonic waves need air medium. And the thin air environment is very unfavorable to ultrasonic propagation. Plus the sound attenuation will therefore increase. Ultimately, it will lead to serious errors in measurement or even can not be measured.

3. If the measured medium is a volatile liquid, or contains a large amount of water vapor, dust, bubbles, suspended particles and other media, the ultrasonic level meter should not be used.
This is due to the fact that when the sound waves from the probe of the ultrasonic level meter encounter the above medium, irregular reflection and scattering will occur. The probe will not be able to receive the normal signal. And these media will absorb the sound waves. This causes the attenuation of sound waves and affects the measurement results.

4. If there are obstacles or equipment that affect the propagation of sound waves inside the vessel. Then the ultrasonic level meter is not recommended.

5. Ultrasonic level meter can generally only be applied in the normal temperature and pressure range. If the pressure is too high, it will have a strong inhibiting effect on the sound speed of the acoustic wave. Eventually, it will affect the measurement accuracy, or even impossible to measure. And the temperature generally cannot exceed 100℃.

Tips for ultrasonic level transmitter installation

Before installing the ultrasonic level Transmitters, please read the instruction manual of the ultrasonic level Transmitters carefully. Work according to the instructions.

At the same time, it should be reconfirmed whether the model of the instrument matches the environmental requirements of the site such as process pressure, process temperature, and chemical properties of the medium. To ensure that the instrument can be used normally after installation.

To install the ultrasonic level meter, please observe the following operating rules:

Try to avoid in-tank facilities such as ladders, heating equipment, limit switch brackets, etc. for installation.
The ultrasonic beam must not intersect the feed stream. At the same time, pay attention to ensure that the highest material level does not enter the measurement blind area during installation. The ultrasonic level Transmitters must not be installed above the feed stream.
When installing the ultrasonic level Transmitters, it should keep a certain distance from the tank wall. And keep the transducer perpendicular to the liquid surface as much as possible.
When installed outdoors, the ultrasonic level Transmitters should take sunshade and rainproof measures. To avoid direct sunlight and reduce measurement errors caused by temperature changes. At the same time should also pay attention to moisture.
The ultrasonic level Transmitters installed in the hazardous area must comply with the installation regulations of the national explosion-proof hazardous area. The intrinsically safe ultrasonic liquid level Transmitter is installed in the occasion with explosion-proof requirements, and the ultrasonic liquid level Transmitter must be grounded.
When there is stirring in the container. The ultrasonic level Transmitters should be kept away from the agitator. In order to eliminate the false echo effect produced by the stirring blade. If foam or waves are created due to agitation, the still-pipe installation method should be used.
When there is foam in the container. When feeding, stirring or doing other processing in the container, foam will be formed on the surface of some media, which will attenuate the signal of the ultrasonic level Transmitter. The sensor should be installed in a still-pipe or a guided-wave radar level Transmitters should be used. Guided wave radar level Transmitters measurements are not affected by foam and are ideal for this application.
When there is airflow in the container. If there is a strong airflow or air vortex in the container, or if it is installed outdoors and in a very windy place. The sensor should be installed in a still-pipe or a guided-wave radar level Transmitters should be used.

Depending on the shape of the tank top of the container, the installation position of the ultrasonic level transmitter should be selected to avoid multiple reflection echoes between the liquid level and the top wall. In order to reduce interference, reduce noise signal and ensure the accuracy of detection.

Installation position of ultrasonic level transmitters

The reasonable installation position of the ultrasonic level transmitter should be determined according to the different top and internal structure shapes of the liquid container:

A. Grooved container:

The support frame should be firm and reliable;
The height of the intersection line of the beam emitted by the probe and the tank wall must be less than or equal to the minimum height of the liquid level to be measured;
The installation height should be within the required range.

B. Arched container:

Meters cannot be installed on vaulted ceilings. It should be installed at 1/2 or 1/3 of the radius of the empowerment.

C. Conical container:

For conical containers with flat tops. The best place to install the meter is in the center of the top of the vessel. This ensures that you measure to the bottom of the container.

ultrasonic level sensor alternative products

**Alternative to VEGAPULS 64-80GHz FMCW Level Radar**

**SIRD-905 Horn Antenna Radar Tank Level Sensor**

**SIRD-802 Radar Level Sensor for Corrosive Liquids**

**Pressure Guided Submersible Level Transmitter**

**Remote Seal Differential Pressure Transmitter**

**Differential pressure(DP) level transmitter**

**SI-PCM260 Deep Well Water Level Sensor**

**SIRD70 Guided Wave Radar (GWR) Level Transmitters**

Frequently
Asked
Questions

Help Center

Ultrasonic level transmitters use sound waves to measure the level of a liquid in a tank. The transmitter sends out a sound wave and measures the time it takes for the sound wave to bounce back. The transmitter then calculates the distance from the sensor to the liquid surface and displays the level on a digital display.

An ultrasonic level sensor is a device that uses sound waves to measure the level of liquids, pastes, sludges, and other similar substances. Ultrasonic sensors are unaffected by dielectric constant, density or humidity, and also have a self-cleaning effect that prevents build-up.

Ultrasonic level measurement works by sending out a sound wave from the sensor and measuring the time it takes for the sound wave to bounce back. The time it takes for the sound wave to bounce back is directly proportional to the level of the liquid. Ultrasonic sensors are very accurate and can be used in a wide range of applications.

Radar level transmitters use microwave energy to measure the level of liquids, while ultrasonic level transmitters use sound waves. Both technologies have their own advantages and disadvantages. Radar is more accurate than ultrasonic, but it is also more expensive. Ultrasonic is less accurate than radar, but it is less expensive and easier to install.

Sino-Ins offers 20 ultrasonic level transmitters products.

About 13% of these are ultrasonic level transducers, 4% are ultrasonic level indicators.

A wide variety of ultrasonic level transmitters options is available to you, such as free samples, paid samples.

Sino-Inst is an ultrasonic level transmitter supplier, located in China.

Ultrasonic level transmitter products are most popular in North America, Mid East, and Eastern Europe.

The United States, and India, which export 99%, 1%, and 1% of ultrasonic level transmitters respectively.

You can ensure product safety by selecting from a certified supplier, with ISO9001, ISO14001 certification.

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KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

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SI-303 Low-Pressure Transducer

Posted on July 9, 2019 by KimGuo11

Low pressure transducers for air and non-corrosive gases low pressure measurement.

Low pressure transducers also called low pressure transmitters. Sino-Inst offers High-precision low-pressure pressure transducers. 0 ～ 2.5kPa to 0 ～ 30kPa measurable. Low pressure transducer converts the measured pressure into an accurate electrical signal. This process is achieved through a high-performance amplifier circuit. The unique design of this product makes it unique in terms of environmental resistance. It is less affected by temperature changes. Anti-vibration With good long-term stability. Low pressure tranducers are suitable for applicaitons like: Liquid level. Flood warning. Waste water. Clean room. And open channel flow applications.

Sino-Inst offers a variety of low pressure transducers for industrial pressure measurement. If you have any questions, please contact our sales engineers.

Description

Sino-Inst SI-303 series high-precision low-pressure pressure transmitters adopt internationally renowned brand sensors. The measured pressure is converted into accurate electrical signals through high-performance amplifying circuits.

The unique design of this product makes it resistant to environmental influences Unique play. Little affected by temperature change. Vibration resistance and good long-term stability. It is extremely suitable for engineering equipment, factory automation control and other fields.

Features of Low-Pressure Transmitter

Low range and high dynamic frequency response;
Full stainless steel housing, excellent corrosion performance;
Advanced temperature digital compensation function, wide working temperature range;
Using piezoresistive diffusion silicon chip. The natural frequency is higher than the piezoelectric dynamic pressure sensor (the natural frequency can reach 400kHz);
Good signal-to-noise ratio, high resolution, high signal-to-noise ratio, and strong anti-interference ability;
Small size, light weight, complete type, high cost performance;
Suitable for high-end measurement industries. Such as chemical explosion experiments, hydraulic engineering and aerodynamic experiments;

Specifications of SI-303 Low-Pressure Transducer

Measurement medium	Non-corrosive, dust-free, dry gas
Measuring range	0 ～ 2.5kPa to 0 ～ 30kPa
Overload pressure	1.5 times the range
output signal	4 ～ 20mADC (two-wire system) 0 ～ 5VDC, 1 ～ 5VDC (three-wire system)
Supply voltage range	16 VDC ～ 32VDC (constant voltage)
Standard supply voltage	24VDC (constant voltage)
Response time	1.0ms 1.0ms
Operating temperature	-20 ℃ ～ + 85 ℃
Compensation temperature	0 ～ 70 ℃
Relative humidity	0 ～ 100% (non-condensing)
Load Resistance	(4 ～ 20mA): R = (U-16) /0.02-RD Where: U is the power supply voltage and RD is the cable internal resistance
Sum of linearity, hysteresis, and repeatability errors	± 0.2% FS (typical value) ± 0.4% FS (maximum)
Power Impact	Less than 0.02% / V of the output range
Zero temperature drift	± 1.5% FS (± 0.2% level), ± 2% FS (± 0.4% level)
Full-scale temperature drift	± 1.5% FS (± 0.2% grade), ± 2% FS (± 0.4% grade)
Long-term stability	± 0.25% FS / year
Resolution	Infinite, limited only by output noise
Housing material	stainless steel
Process interface	M20 × 1.5, M12 × 1 Or special production according to user needs
Leading method	Direct outlet, aviation plug, Hirschmann plug
Electrical parameters (voltage output type):	Circuit: 3 wires Power supply: 24VDC Output: 0 ～ 5VDC or 1 ～ 5VDC
Electrical parameters (current output type):	Circuit: 2 wires Power supply: 24VDC Output: 4-20mA

Read more about: Common Units Of Pressure

Applications of Low pressure transducers

Developed for low pressure applications in general industry and OEM applications
Flow measurement
Room monitoring
Energy management
HVAC and VAV
Process control
Aerospace
Car, medical equipment
Pipeline system

What is a low-pressure transducer?

Low pressure transducer is pressure transmitter based on piezoresistive pressure sensor. Low pressure transmitters are suitable for air and non-corrosive gases low pressure measurement.

Low pressure transmitters are suitable formeasuring low-level gauge, differential & absolute pressures. Low pressure transmitters with 4 to 20 mA current output, can measure low pressure below 1 bar (15 psi, 400 inWG or 1000 mbar).

Low-pressure transmitters are used to measure air ventilation pressures in buildings. And small pressure differences between two different locations. Such as clean rooms and laboratories where it is important to prevent air contamination.Low pressure ranges are required to measure small pressure values. Often between two locations where the air is being moved from one place to another.

Low range pressure measurement is required for monitoring and controlling ventilation, and air extraction in office and factory buildings. In building management applications, air movement in large spaces creates very small changes in air pressure. So it is necessary to use highly sensitive measurement devices, which are set to read in inches of water column, mbar, hPa or Pascals.

How low-pressure transducers work?

Low pressure pressure transmitters use semiconductor piezoresistive effect and micro-machining technology.

On single crystal silicon wafers, semiconductor processes such as photolithography and diffusion are used to make Wheatstone bridges.

When subjected to external forces, micro-strains are generated. The electric bridge is out of balance. The signal is processed by a high-performance amplifying circuit. Makes the product have the advantages of high accuracy, good repeatability, high reliability, etc.

The circuit and core are all sealed in a stainless steel housing. And a variety of installation interfaces are designed.

For very low pressures, there are other types of transducers available, which are based on other principles. These include Pirani gauge, thermocouple and ionization gauge.

The first two techniques are based on the rate at which heat is loss from a heated filament placed in the low-pressure environment. This heat loss is depended on the number of gas molecules per unit volume.

Pirani gauge – This gauge calculates filament temperature by measuring filament resistance. Resistance measurement is measured with the help of a Wheatstone bridge circuit. The relation between the resistance and the applied pressure is highly non-linear.
thermocouple – In this type of pressure transducer, a thermocouple is attached to the heated filament to measure its temperature. For the reference temperature in the thermocouple, room temperature is used. The voltage output of the thermocouple varies non-linearly with the gas pressure.
Ionization gauge – It is highly useful for measuring very small pressures in the range of 10–3 atm to 10–13 atm. Here, the gas, whose pressure is to be measured, is ionized with the help of a heated filament. The current is measured between two electrodes in the ionized region, which depends on the gas pressure, because the number of ions per unit volume depends on the gas pressure.

Q&A

What is the function of a pressure transducer?

A pressure sensor is a device for pressure measurement of gases or liquids. Pressure is an expression of the force required to stop a fluid from expanding, and is usually stated in terms of force per unit area. A pressure sensor usually acts as a transducer; it generates a signal as a function of the pressure imposed. For the purposes of this article, such a signal is electrical.
More about Pressure sensor Wikipedia.

How does a 3 wire pressure transducer work?

Three-wire system: The three-wire sensor is the separation of the positive terminal of the power supply and the positive terminal of the signal output, but they share a COM terminal.
Use one wire for the positive end of the power supply and one wire for the positive end of the signal output. The negative end of the power supply and the negative end of the signal share one line. Its power supply is mostly 24v.dc, the output signal is 4-20ma.dc, the load resistance is 250ω or 0-10ma.dc, and the load resistance is 0-1.5kω; some also have ma and mv signals, but the load resistance or input The resistance varies with the form of the output circuit. The designation of a few-wire system was only after the birth of the two-wire transmitter. This is the result of the extensive application of electronic amplifiers in meters. The essence of amplification is an energy conversion process, which is inseparable from power supply. So the first to appear is a four-wire transmitter; that is, two wires are responsible for the power supply, and the other two wires are responsible for outputting the amplified signal (such as voltage, current, etc.).
How is a 3 wire 4-20mA pressure transmitter connected electrically?
Example of Sensor Connections:
Volts Input + (Supply positive)
Current Output + (Signal positive)
Volts Input (negative) / Current Output (Supply negative)

How do you hook up a pressure transducer?

Pressure sensors are generally two-wire, three-wire, four-wire, and some are five-wire.
Pressure sensor two-wire system is relatively simple. General customers know how to connect. One line is connected to the positive pole of the power supply. The other line is the signal line connected to the negative pole of the power supply through the instrument. This is the simplest. A wire is added to the wire system. This wire is directly connected to the negative pole of the power supply, which is a bit more troublesome than the two-wire system.
The four-wire pressure sensor must have two power input terminals and the other two signal output terminals. Most of the four-wire system is a voltage output rather than a 4-20mA output. The 4-20mA is called a pressure transmitter, and most of them are made of two-wire system.
Some of the signal output of the pressure sensor is not amplified, and the full-scale output is only tens of millivolts. Some pressure sensors have internal amplification circuits, and the full-scale output is 0 ~ 2V.
As for how to connect the display meter, it depends on the range of the meter. If there is a gear that is compatible with the output signal, you can directly measure it, otherwise you need to add a signal adjustment circuit. The five-wire pressure sensor is not much different from the four-wire system. There are relatively few five-wire sensors on the market.

Industrial Pressure Sensors

https://www.drurylandetheatre.com/industrial-process-pressure-transmitters/

Sino-Instrument offers over 10 Low-Pressure Transducers.

About 50% of these are 4-20ma Low-Pressure Transducers. 40% are Differential Pressure Gauge. And 20% are Diaphragm Seal Pressure transmitters. 20% are 4-20ma differential pressure transmitters.

A wide variety of Low-Pressure Transducers options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of
Low-Pressure Transducers, located in China.

The top supplying country is China (Mainland), which supply 100% of
Low-Pressure Transducers respectively.

Sino-Instrument sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.

Low-Pressure Transducers products are most popular in Domestic Market, Southeast Asia, and Mid East.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Request a Quote

Please enable JavaScript in your browser to submit the form

KimGuo11

drurylandetheatre.com

SI-350 Sanitary Pressure Transmitter

Posted on July 9, 2019 by KimGuo11

Sanitary Pressure Transmitter is also called a Hygienic pressure sensor or tri-clamp pressure transmitter. Sanitary Pressure Transmitter is used for food &beverage or pharmaceutical application.

Sanitary Pressure Transmitter, also called tri-clamp pressure transmitter. It is the pressure transducer with the flush diaphragm (flat membrane) as the pressure sensor. Sanitary Pressure Transmitter uses a flat membrane to directly sense the pressure. The sensor interface is available in clamp type, M27 × 2, and flange type.

The sanitary pressure transmitter is designed especially for the requirements of the food and beverage, pharmaceutical and biotechnology industries.
It is particularly suitable for the special conditions of CIP/SIP cleaning processes. Such as chemical stability towards cleaning liquids and high temperatures

Sino-Inst offers a variety of Sanitary Pressure Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.

More Pressure Transmitters

Features of Sanitary Pressure Transmitter

Pressure interface with 316L flat diaphragm structure
Hygienic, anti-fouling
Wide measuring range for absolute pressure, gauge pressure and sealed reference pressure
Good sealing and stable work for a long time
With heat sink, high temperature media application performance
Output signal can be selected, can be customized according to customer requirements

No Liquid Fill Diaphragm, Sanitary Clamp Fitting

The SI-350 sanitary pressure transmitter uses a flat membrane to directly sense the pressure signal. The diffused silicon pressure core acts as a sensitive component. Standard silicone oil is used as the pressure transmission medium.

The measuring end is made of 316L stainless steel and is specially welded and processed. Compact structure, corrosion resistance, vibration resistance, and wide temperature compensation.

SI-350 Sanitary Pressure Transmitter Type prevents fouling, unsanitary and sticky pressure blocking. Due to the pressure felt directly at the exposed end of the threaded diaphragm. It is particularly suitable for pressure measurement of viscous fluids with hygienic requirements in the medical and food industries.
Widely used in food, medicine, brewing, and other health industries. And stress tests that can scale the measurement medium.

Specifications of SI-350 Sanitary Pressure Transmitter

Model	Description
350-02	Sanitary pressure transmitter, range 0- 10kPa, 300％FS overpressure, 2″ sanitary clamp connection.
350-101	Sanitary pressure transmitter, range 0- 20kPa, 300％FS overpressure, 1-1/2″ sanitary clamp connection.
350-12	Sanitary pressure transmitter, range 0- 400kPa, 200％FS overpressure, 2″ sanitary clamp connection.
350-22	Sanitary pressure transmitter, range 0- 600kPa, 200％FS overpressure, 2″ sanitary clamp connection.
350-32	Sanitary pressure transmitter, range 0-1MPa, 200％FS overpressure, 2″ sanitary clamp connection.
350-42	Sanitary pressure transmitter, range 0-1.6MPa, 200％FS overpressure, 2″ sanitary clamp connection.
350-52	Sanitary pressure transmitter, range 0-2.5MPa, 200％FS overpressure, 2″ sanitary clamp connection.
350-62	Sanitary pressure transmitter, range 0-6MPa, 150％FS overpressure, 2″ sanitary clamp connection.
350-72	Sanitary pressure transmitter, range 0-10MPa, 150％FS overpressure, 2″ sanitary clamp connection.

Range range	-100kPa…0~10kPa…10MPa
Pressure type	gauge pressure, absolute pressure, sealing pressure
Power output	4 to 20 mA (12 to 30 VDC) 0 to 5V, 1 to 5V, 0.5 to 4.5V, 0 to 10V (12 to 24VDC)
Accuracy	0.5% FS
Hysteresis and repeatability	0.1%FS
Temperature drift	1.5% FS (@-20 °C ~ 85 °C)
Response time	≤ 1ms (up to 90% FS)
Service life	≥10x 10^6 pressure cycle
Working temperature	-20 ° C ~ 85 ° C
Storage temperature	-40 ° C ~ 85 ° C
Medium temperature	-40～85°C (without heat sink) -40～150°C (three heat sinks), -40°C～250°C (five heat sinks)
Insulation resistance	≥100MΩ/250VDC
Vibration resistance	Sinusoidal: 20g, 25Hz~2kHz; IEC 60068-2-6 Random: 7.5grms, 5Hz ~ 1kHz; IEC 60068-2-64
Protection level	IP65
Media compatible	with a variety of media compatible with 316L stainless steel
Explosion-proof grade	Intrinsically safe explosion-proof ExiaIICT6

Guess You’ll Like: Explosion Proof Pressure Transmitter

Applications of Sanitary Pressure Transmitter

Ideal for applications where sanitary conditions are of high priority (i.e. dairy, food processing, pharmaceutical, etc.)

Medical and health, food, wine, dairy, beverages, etc. thick and easy to block, high hygienic requirements, easy to clean occasions.

Environmentally friendly chemical coatings, polyurethane equipment, paint inspection systems, etc.

Extended reading: Vortex Hygienic Flow Meter

Sanitary process applications
Food and beverage processing
Water processing
Dairy processing
Pharmaceutical processing

Extended reading: Food grade flow meters for Food & Beverage industry

Drawing of SI-350 Sanitary Pressure Transmitter

More Featured Pressure Transmitters

**Diaphragm Seal Pressure Transmitter**
When the process medium should not come into contact with the pressured parts of the measuring instrument. Diaphragm sealed pressure transmitters are used.

**SI-303 Low-Pressure Transducer**
Low pressure transducers for air and non-corrosive gases low pressure measurement. 0 ～ 2.5kPa to 0 ～ 30kPa measurable.

**SI-703 Flush diaphragm pressure sensor**
Flush membrane / diaphragm structure, anti-blocking design. Pressure measurement of viscous media.

**SI-10 Liquid pressure sensor**
Liquid pressure sensor is widely used for pressure measurement of various liquids. Like water or oils. IP68 waterproof.

**SI-503K Gas Pressure Sensor**
Gas pressure sensor for industrial gas pressure monitoring. Pagoda gas nozzle Φ8. Such sensors are also commonly referred to as wind pressure transmitters, exhaust pressure sensors.

**SI-702 High Pressure Sensor**
High pressure sensor is pressure transmitter designed for high pressure measure&control. 0 ～ 40MPa… 600MPa. M20 × 1.5, G1 / 2 (others are customized according to requirements)

**SI-702S Ultra-High Pressure Senors**
Pressure sensor for Ultra high pressure applications. Ultra high pressures up to 15,00MPa. 0-2000MPa to 0-7000MPa (customized).Ball head M20 × 1.5, cone head M20 × 1.5.

**High-Temperature Pressure Transmitter**
High-temperature pressure transmitters with a 4-20mA output.
which has a temperature capability of over 850 °C and is not pyroelectric.

Technical Support

Flush diaphragm pressure transducer

Flush diaphragm pressure sensor uses a diaphragm isolation process. Feel the pressure directly with a flat membrane. There is no pressure hole in the test head. There is no clogging of viscous media during the measurement. Adopting flush membrane structure, diffused silicon pressure-sensitive core body, with good moisture resistance and excellent media compatibility. The sensor interface is available in clamp, thread and flange options. The output signal can be selected from voltage, current, and so on. The flush diaphragm of the sensor prevents problems such as scaling, unsanitary and clogging of viscous liquids.

More

Steam pressure transmitter

High Temperature Pressure Transducer/Transmitter works for steam and fluid. Temperature: -30 ℃ ～ 160-350 ℃, customized up to 850 ° C. It is possible to fit a stand off pipe, pigtail or other cooling device to reduce the media temperature. If not, High Temperature Pressure Transducer/Transmitter is the best choice. The pressure is transmitted to the sensor through the heat dissipation structure on the transmitter. The high-precision signal processing circuit is located in the stainless steel housing. The sensor output signal is converted to standard output signal, like 4-20mA.

More

High pressure transducer

The sino-Inst high-pressure transducer has gone through thousands of fatigue impact tests and several days of low and medium temperature aging cycles before leaving the factory. It has solved the disadvantages of high-pressure sensors in terms of stress and zero instability. Provide customers with reliable products for high voltage measurement. The pressure of the SI-702 series can reach 600MPa. The precision level is high, and the mature production technology can ensure the long-term stability of the sensor with excellent characteristics. SI-702 series pressure sensors are suitable for oil extraction platforms, water flow equipment, high-pressure measurement equipment, hydraulic control systems, test benches, and industrial automation control.

More

Pressure Transducer 4-20mA/Voltage

The signal system of 4-20mA and 1-5V output by the pressure transmitter is stipulated by international standards.In the signal circuit, the pressure transmitter is equivalent to a variable resistor. It is connected in series with the power supply, ammeter (indicator), and load resistance (including wire resistance). The function of the pressure transmitter is to change the current in the circuit in the range of 4-20mA by changing its own resistance according to requirements.The pressure acts on the sensor, and the sensitive element deforms. The deformation will cause the resistance or capacitance value to change. And then it will be converted into an analog 4-20mA output by the conversion circuit.

More

Industrial Pressure Sensors

https://www.drurylandetheatre.com/industrial-process-pressure-transmitters/

Other Sanitary Instruments

Sanitary Bimetal Thermometers also called the sanitary thermometer, or tri-clamp thermometer.

Sino-Instrument’s Sanitary Bimetal Thermometers are specially designed for direct insertion into sanitary process applications when a standard thermowell is not specified, or the process environment is not exposed to pressure.

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Sanitary Flow Meter, also called sanitary turbine flow meter or Hygienic turbine flowmeter.

The Sino-Instrument sanitary turbine flow meter, food grade flow meter, provides accuracy, versatility, and economy, in measuring a wide variety of food, beverage and pharmaceutical products.

View Details

All of Sino-Inst pressure transmitters can work with the AMS TREX!

FAQ

What is pressure transmitter how it works?

Pressure Transmitters are sensors with electrical transmission output for remote indication of pressure. Process transmitters differentiate themselves from pressure sensors through their increased range of functionality. They feature integrated displays, offer high measuring accuracies and freely scalable measuring ranges. Communication is via digital signals, and waterproof and explosion-proof certifications are available. Through connection to diaphragm seals, they are suitable for the harshest operating conditions. Ideal for OEMs, process applications, water processing, and industrial pressure applications.

What is the input of the pressure transmitter?

A pressure transmitter is an instrument that converts pressure variables into a standardized output signal that can be transmitted. And there is a given continuous function relationship between the output signal and the pressure variable (usually a linear function). Mainly used for measurement and control of industrial engineering pressure parameters. Differential pressure transmitters are often used for flow measurement.
There are two types of pressure transmitters, electric and pneumatic. The electric standardized output signals are mainly 0mA ~ 10mA and 4mA ~ 20mA (or 1V ~ 5V) DC signals.

How do you calibrate a pressure transmitter?

If the transmitter is used for a period of time, it may cause a change in metering performance. There will be zero drift and increased measurement error. Therefore, it is necessary to perform regular calibration. The accuracy of the calibrator used for calibration should be more than 3 times the required calibration accuracy. Use the pressure calibrator to input the standard pressure values of 0%, 25%, 50%, 75%, and 100% of the range to the transmitter in the forward and reverse directions. Check whether the current output signal is within the allowable accuracy range. If it is out of tolerance, it needs to be adjusted. The adjustment method is as follows (4 ~ 20mA output):
(1) Input a standard pressure of 4mA with a pressure calibrator. Adjust the ZERO (zero) potentiometer. Make the 4mA current output within the accuracy range.
(2) Input a standard pressure of 20mA with a pressure calibrator. Adjust the SPAN (range) potentiometer. Make the 20mA current output within the accuracy range.
(3) ZERO and SPAN will contain each other. Repeat steps (1) (2) until the current output of 4mA point and 20mA point meets the accuracy requirements at the same time. Then check whether the current output of the 25%, 50%, 75% range points meets the accuracy requirements. The transmitter is qualified if it meets the requirements.

What are the types of pressure transmitters?

There are different types of pressure transducers based on their design.
These sensors can come in several shapes and sizes,
but the technology inside can also differ.
There 4 main types of pressure sensors based on this:
Strain Gauge Pressure Transducers
Capacitance Pressure Transducers
Potentiometric Pressure Transducers
Resonant Wire Pressure Transducers
More about Industrial Pressure Sensors

Sino-Instrument offers over 10 Sanitary Pressure Transmitters.

About 50% of these are 4-20ma pressure transmitters, 40% are Differential Pressure Gauge. And 20% are Diaphragm Seal Pressure transmitters. 20% are 4-20ma pressure transducer wiring diagrams.

A wide variety of Sanitary Pressure Transmitter options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of Sanitary Pressure Transmitters, located in China.

The top supplying country is China (Mainland), which supply 100% of Sanitary Pressure Transmitters respectively.

Sino-Instrument sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.

Sanitary Pressure Transmitter products are most popular in Domestic Market, Southeast Asia, and Mid East.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Request a Quote

KimGuo11

drurylandetheatre.com

SI-300 Pressure Transducer 4-20mA/Voltage

Posted on July 9, 2019 by KimGuo11

Pressure transmitters convert pressure signal into 4 ～ 20mA DC, 0-5V, 0-10V signal output.

Sino-Inst offers a variety of 4-20mA pressure senors for industrial pressure measurement. If you have any questions, please contact our sales engineers.

The SI-300 4-20mA/Voltage Pressure Transducer, also called pressure transmitter 4-20mA. It is a pressure sensor with 4-20ma/Voltage output.

4-20mA Pressure Transducer can be OEM as differential pressure, explosion-proof, or sanitary, just as you need.Ideal for OEMs, process applications, water processing, and industrial pressure applications.

Features of SI-300 Pressure Transducer 4-20mA/Voltage

Sensor Type : Industrial Pressure Transducers
Pressure Range : 0 – 25 to 14000 psi
Output/Span : .5 – 4.5 V, .5 – 4.5 V, 1 – 5 V, 1 – 6 V, 10 mV/V, 4 – 20 mA
Type : Compound, Gage, Sealed
Accuracy : ±0.5% FSO

All of our pressure transmitters can work with the new AMS TREX

Specifications of SI-300 Pressure Transducer 4-20mA/Voltage

Range range	-100kPa…0~10kPa…100MPa (14000psi)
Pressure type	Gauge pressure, absolute pressure, sealing pressure
Power supply	24V, 12V
Output signal	4~20mA, 1~5V, 0~10V
Working temperature	-20 ° C ~ 85 ° C
Medium temperature	-20 ° C ~ 85 ° C
Storage temperature	-40 ° C ~ 125 ° C
Zero temperature drift	±1.5% FS (@-20°C～85°C)
Sensitivity temperature drift	±1.5%FS (@-20°C～85°C)
Overload pressure	150% FS
Mechanical vibration	20g (20～5000HZ)
Impact	100g (11ms)
Comprehensive accuracy	0.5, 0.3 optional
Insulation	100MΩ /250VDC
Response time	≤ 1ms (up to 90% FS)
Long-term stability	±0.2%FS/year
EMC Surge	(IEC61000-4-5) 2KV
EMC static	(IEC61000-4-2) contact discharge 8KV, air discharge 15KV
Protection level	IP65
Explosion-proof grade	Intrinsically safe explosion-proof ExiaIICT4
Material Housing	stainless steel; isolation diaphragm 316L
Media compatible	with a variety of media compatible with 316L stainless steel

Read more about: What Is 0-10V Signal Output?

Applications of Pressure Transmitter 4-20mA

Industrial OEM Equipment
Water Management
Pneumatics
Hydrogen Storage
Sub Sea Pressure
HVAC/R Equipment
Control Panels
Hydraulic Systems
Data Loggers

Extended reading: How to convert a 4-20mA to 0-10V /1-5V signal?

Drawings of SI-300 Pressure Transducer 4-20mA/Voltage

4-20ma pressure transducer wiring diagram

We offer OEM and Reseller Discounts for all kinds of 4-20mA pressure transducer

4-20ma differential pressure transmitter

The Smart Differential Pressure transmitter is upgraded **differential pressure transmitter**, which can work **with display, HART communicators, and 4-20mA output**. **SMT3151DP smart differential pressure transmitters** can be used for **differential pressure measurement.**

Diaphragm seals 4-20ma pressure transducer

Diaphragm seals are used to prevent process medium,
from entering into the pressure-sensing assembly of the **Differential pressure, Gauge pressure,**
orAbsolute pressure transmitter.

Industrial Pressure Transmitter

Submersible Pressure Transducer 4-20mA

**Submersible pressure transducer with 4-20mA output,**
is normal **submersible pressure transmitter** for **level measurement.**
Sino-Instrument Hydrostatic submersed level transducers are sensors,
with an electrical transmission output for indication of liquid level.

What is a 4-20mA Current Loop?

The 4-20 mA current loop is a process control signal commonly used in many industries.

This is an ideal method for transmitting process information. Because the current does not change when it flows from the transmitter to the receiver. It is also simpler and cost-effective. However, the number of voltage drops and process variables that need to be monitored can affect their cost and complexity.

By understanding these basics, you will be able to make more informed decisions about process control in your facility. This may affect your bottom line.

In order to understand what a 4-20 mA direct current (DC) loop is and how it works, we need to understand some math. Don’t worry we won’t study any advanced electrical engineering formulas.

In fact, the formula we need is relatively simple:
V = I x R This is Ohm’s law.

This means that the voltage (V) is equal to the current (I) times the resistance (R) (“I” stands for Intensitéde Courant, French for Current Intensity).
This is the basic equation in electrical engineering.
Consider the simple DC circuit above, which consists of one power supply and three loads.
The current loop requires voltage to drive the current. This is powered by the {PART 1} 12 power supply, which is labeled Vtot. Current then flows through the loop through each load. The voltage drop of each load can be calculated according to Ohm’s law.
The voltage drop V1 across R1 is:
Each element in the loop provides a voltage or has a voltage drop. However, currently, everything is the same in the loop.

This is the key principle of the 4-20 mA loop. The current is the same everywhere in the entire circuit.
It may be difficult to understand why the current stays constant, so compare your home’s water supply system.

There is a certain pressure in the water pipes that pushes the water towards the house. Voltage acts in a similar manner as pressure, pushing current through the circuit.
When the faucet in your home is turned on, the water runs down. The flow of water is similar to the flow of electrons or electricity. The ability of pressure to force water through a pipe is limited by the bending and restraint of the pipe. These limits limit the flow in the pipeline, similar to how resistors limit current.

Even if the pressure and voltage drop at various points, the flow through the pipeline and the current through the wires remain constant throughout the system.

This is why the use of current as a method of transmitting process information is so reliable.

Components of a 4-20 mA Loop

1. Sensor
2. Transmitter
3. Power Source
4. Loop
5. Receiver

Why we use the 4 20mA in transmitting signal?

Why is it 4/20 mA?

The reason for using a current signal is that it is less susceptible to interference. And the internal resistance of the current source is infinite. The wire resistance is connected in series in the loop without affecting the accuracy. And it can be transmitted over ordinary twisted pairs for hundreds of meters.

Due to explosion protection requirements, the upper limit is 20 mA: the spark energy caused by a current interruption of 20 mA is not sufficient to ignite the gas.

The reason why the lower limit is not set to 0mA is to detect a disconnection. During normal operation, the value will not be lower than 4mA. And when the transmission line is disconnected due to a fault, the loop current will drop to 0.

Usually, 20mA is used as the disconnection alarm value. There are two more reasons.
One reason is to avoid interference.
Another reason is that the two-wire system uses 4-20 mA of current. That is, the two wires are the signal line and the power line. The 4 mA is used to provide the quiescent operating current of the circuit for the sensor.

Extended reading: Smart Differential Pressure Transmitter

Pressure transmitter 4-20ma price

First of all, the parameters that must be seen when purchasing a pressure transmitter are:
Pressure range. Range. Measurement medium. Installation method-threaded flange clamps, etc. Installation dimensions. Temperature. Whether with display. Whether with HART protocol. Output type. Current output or voltage output. Explosion-proof level, protection level. Accessories. Mounting bracket.
The above parameters will affect the price of the pressure transmitter.
Sino-Inst, as the manufacturer of pressure transmitter, offer you with the best price.

Q&A

What does a pressure transducer do?

A pressure transducer is a device or device that can sense the pressure signal and convert the pressure signal into a usable output electrical signal according to a certain rule.
A pressure transducer usually consists of a pressure-sensitive element and a signal processing unit. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors.
Pressure transducer is the most commonly used sensor in industrial practice. It is widely used in various industrial automatic control environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military, petrochemical, oil wells, electricity, ships, machine tools , Pipelines and many other industries.

How do you test a 4 20ma pressure transducer?

Pressure transducer is a commonly used pressure instrument, which has certain applications in many industries. When a user detects a pressure transducer, the detection items are different depending on the purpose. Of course, the detection methods will be different. I will introduce 3 common methods for pressure transducer detection, and I hope it can help everyone.
1. Pressure test.
The detection method is: power the sensor. Use your mouth to blow the air holes of the pressure sensor. Use the multimeter’s voltage range to detect the voltage change at the output of the sensor. If the relative sensitivity of the pressure sensor is large, this amount of change will be significant. If nothing has changed, you need to use a pneumatic source instead.
Through the above methods, the condition of a sensor can be basically detected. If accurate testing is required, a standard pressure source is required. Apply pressure to the sensor and calibrate the sensor according to the pressure and the change of the output signal. When conditions permit, temperature detection of relevant parameters is performed.
2. Detection of zero point.
Use the multimeter’s voltage range. Detects the zero output of the sensor without applying pressure. This output is typically a mV level voltage. If it exceeds the sensor specifications. It means that the zero deviation of the sensor is out of range.
3. Detection of bridges.
The main test circuit of the sensor is correct. It is generally a Wheatstone full-bridge circuit, which uses the ohm range of a multimeter to measure the impedance between the input terminals and the impedance between the output terminals. These two impedances are the input and output impedances of the pressure sensor. If the impedance is infinite, the bridge is disconnected. It indicates that there is a problem with the sensor or the definition of the pins is not judged correctly.

What is a low pressure transducer?

Low pressure transducers for air and non-corrosive gases low pressure measurement.
Low pressure transducers also called low pressure transmitters. Sino-Inst offers High-precision low-pressure pressure transducers. 0 ～ 2.5kPa to 0 ～ 30kPa measurable. Low pressure transducer converts the measured pressure into an accurate electrical signal. This process is achieved through a high-performance amplifier circuit. The unique design of this product makes it unique in terms of environmental resistance. It is less affected by temperature changes. Anti-vibration With good long-term stability. Low pressure tranducers are suitable for applicaitons like: Liquid level. Flood warning. Waste water. Clean room. And open channel flow applications.
More about low pressure transducer.

What is the difference between transmitter and transducer?

A pressure sensor is a device or device that can sense a pressure signal and convert the pressure signal into a usable output electrical signal according to a certain rule.
A pressure sensor usually consists of a pressure-sensitive element and a signal processing unit. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors. A pressure sensor is the core part of pressure transmitter.
In a pressure transducer, a thin-film or piezo-resistive pressure sensor is mounted on a process connection. The transducer converts pressure into an analog electronic output signal, typically as a millivolt per volt output. These signals are not linearized or temperature compensated.
A pressure transmitter has additional circuitry that linearizes, compensates, and amplifies the signal from a transducer. The different signal types are typically voltage signals (eg, 0 to 5 or 0 to 10 volts), milliamp (eg, 4 to 20 milliamp), or digital. The instrument then can transmit the signal to a remote receiver.

Sino-Instrument offers over 50 pressure transducers 4-20mA/Voltage.

About 50% of these are 4-20ma differential pressure transmitters, 40% are Differential Pressure Gauge, and 20% are Diaphragm Seal Pressure transmitters, 20% are 4-20ma pressure transducer wiring diagram.

A wide variety of pressure transducers 4-20mA options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of pressure transducers 4-20mA, located in China.

The top supplying country is China (Mainland), which supply 100% of
pressure transducers 4-20mA respectively.

Sino-Instrument sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.

Pressure Transducer 4-20mA/Voltage products are most popular in Domestic Market, Southeast Asia, and Mid East.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Current Output, 4 – 20 mA Transmitters

KimGuo11

drurylandetheatre.com

How Does a Pressure Transmitter Work?

Posted on July 5, 2019 by KimGuo11

What is a pressure transmitter?

A pressure transmitter also often called a pressure transducer. A pressure transmitter is a device used to measure the pressure of liquids or gases in pipes or containers. It works by converting the pressure readings into an electrical signal that can be easily transmitted to a control system for monitoring and analysis.

These devices are commonly used in industrial settings, such as in manufacturing plants and refineries. Where it’s important to monitor the pressure of gases and liquids flowing through pipes and containers to ensure that they’re at safe levels.

Pressure transmitters can measure pressure in gases, liquids, air or oil. Widely used in various industrial processes. Such as pharmaceutical industry, chemical feed, waste water industry, food industry, farms, etc.

Overall, pressure transmitters are essential tools for measuring and monitoring pressure levels in various settings, helping to keep people and equipment safe and functioning properly.

In order to choose a suitable pressure transmitter, we must understand what types of pressure transmitters are there, what are the functions of pressure transmitters, and how do pressure transmitters work? Read on to find out the answers below.

Types of Pressure Transmitters

According to different measurement media, pressure transmitters can be divided into liquid pressure transmitters and gas pressure transmitters.
According to the measurement conditions, the pressure transmitter can have a high temperature type, a very low temperature type, and a high pressure type.
Here we divide by the type of pressure measured.

Type of Pressure Transmitter	Characteristics/Principles
Absolute Pressure Transmitter	– Measures pressure relative to atmospheric pressure – Can only measure positive pressures
Gauge Pressure Transmitter	– Measures pressure relative to atmospheric pressure – Can only measure positive pressures
Differential Pressure Transmitter	– Measures the difference between two pressures – Can measure both positive and negative pressures<br>- Used to measure flow rates
Vacuum Pressure Transmitter	– Measures pressure below atmospheric pressure – Can only measure negative pressures – Used to maintain vacuum in a process
Hydrostatic pressure transmitters	– Often called level transmitters. Because of their working principle and ability to measure level. – Hydrostatic pressure transmitters work on the basis that the amount of pressure increases with depth. – These devices are submersible and can be used for liquids and gases.

Featured Pressure Transmitters

**SI-512H High Temperature Pressure Sensor**

**SIJC-1000HSM-Silicon Pressure Sensor**

**SI-706 Combined Pressure and Temperature Sensor-Dual function**

**Diffused silicon Gauge Pressure Transmitter**

**Capacitive Gauge Pressure Transmitter**

**Explosion-proof Pressure Transmitter**

Pressure Transmitter Working Principle

A pressure transmitter is a device that measures the pressure of fluids or gases in a process and converts it into an electrical signal that can be used for monitoring or control purposes. There are several different working principles that pressure transmitters use to accomplish this:

One of the main components of piezoresistive pressure transmitters is the resistance strain gauge. It is a sensitive device that converts the strain change on the DUT into an electrical signal.

Usually, the strain gauges are closely bonded to the substrate that generates mechanical strain with a special adhesive. When the stress of the substrate changes, the resistance strain gauge also deforms together. Change the resistance value of the strain gauge, so that the voltage applied to the resistance changes. The transmitter has extremely low price and high accuracy and good linearity characteristics.

Diffused silicon pressure transmitters were introduced in the mid-1990s. It utilizes the piezoresistive effect of elastic elements. When the pressure of the measured medium directly acts on the diaphragm of the sensor, the diaphragm produces a micro-displacement proportional to the pressure of the medium, which changes the resistance value of the sensor. This change is detected electronically. And convert and output a unified standard signal.

Compared with traditional products, this transmitter has the advantages of advanced technology, reliable performance, convenient installation, high accuracy and small size.

Corrosion-resistant ceramic pressure transmitters have no liquid transfer. When the pressure acts on the ceramic diaphragm, the diaphragm will produce a slight deformation. Make the thick film resistor printed on the back of the ceramic diaphragm pass through the Wheatstone bridge (closed bridge) connected to it. Output a voltage signal proportional to the excitation voltage.

The pressure physical quantity is measured through the built-in circuit of the transmitter and converted into a unified standard signal.

The transmitter can introduce various media (corrosive and non-corrosive gases, liquids) directly to the ceramic diaphragm.

The thermal stability of the ceramic and its thick-film resistance allow it to operate over a temperature range as high as -40°C to 135°C.

Therefore, it has high measurement accuracy, good stability, strong output signal and low price.

Piezoelectric pressure transmitters work on the piezoelectric effect.

The crystal is anisotropic, and when a force is applied along a certain direction, the crystal can produce an electric effect. When the mechanical force is removed, it will return to the uncharged state again. The piezoelectric materials mainly used in sensors are quartz, sodium potassium tartrate and ammonium dihydrogen phosphate.

The transmitter is mainly used in the measurement of acceleration and pressure. It has the characteristics of simple structure, small size, light weight and long service life. But it can only be used to measure dynamic stress.

The capacitive pressure transmitter is composed of a measuring diaphragm and electrodes on both sides of the insulating sheet to form a capacitance.

When the pressure on both sides is inconsistent, the displacement of the measuring diaphragm is proportional to the pressure difference. Therefore, the capacitance on both sides is not equal.

Through the oscillation and demodulation link, it is converted into a signal proportional to the pressure. Then the pressure physical quantity is measured and converted into a unified standard signal through the transmission circuit.

It has high precision, corrosion resistance, pollution resistance and good stability. It is recognized as an ideal instrument for detecting low vacuum pressure at home and abroad. It is mainly used in various fields of civil industry, and plays a unique role in military industries such as aerospace industry and nuclear industry.

Extended Reading: Smart pressure transmitter

Video source: https://www.youtube.com/embed/QrT8VWxdxwk?rel=0

Flange Mounted Differential Pressure Transmitter

Extended Diaphragm Seal DP Level Transmitter

Pressure transmitter signal output

There are three common signal outputs that pressure transmitters provide: millivolt, amplified voltage, and 4-20mA.

Below is a summary of the outputs and when they are best used.

Millivolt Output:

This type of output signal is a low-level voltage signal that is proportional to the pressure being measured. The signal typically ranges from 0-50mV or 0-100mV, depending on the specific pressure range being measured.

This type of output signal is usually used in applications where the signal needs to be amplified or converted to a different format before it can be used by the control system.

Amplified Voltage Output:

This type of output signal is a higher-level voltage signal that has been amplified to a specific range, such as 0-5V or 0-10V.

The voltage signal is proportional to the pressure being measured and can be used directly by the control system without the need for additional signal conditioning.

Amplified voltage output signals are commonly used in applications where the control system requires a voltage input signal.

4-20mA Output:

This type of output signal is a current signal that ranges from 4mA at zero pressure to 20mA at the maximum pressure being measured.

This type of signal output is popular because it is immune to electrical noise and can be transmitted over long distances without signal degradation.

4-20mA output signals are commonly used in industrial applications where the control system requires a current input signal.

The choice of signal output will depend on the specific requirements of the application, such as the distance between the pressure transmitter and the control system, the required accuracy and resolution, and the environmental conditions.

Extended reading: Pressure indicator transmitters

How to Choose Pressure Transducer

There are multiple types of pressure transducers for a variety of applications.

Each pressure transducer has different aspects, that will impact how it works and the applications the pressure transducer works best for.

When selecting a pressure transducer, keep these 6 criteria in mind:

Application and measurement type
Pressure range
Process media
Temperature range and installation environment
Accuracy
Output

If you still don’t know how to choose the pressure transmitter, please contact our sales engineers.

how to use a pressure transducer?

Once you receive the pressure transmitter you ordered, you are ready to use it. First, please check the instruction manual configured by the manufacturer. Based on our many years of experience at Sino-Inst, you can start using a pressure transmitter by following these steps:

Confirm parameters: Before use, please confirm whether the model, range, output type (generally 4-20 mA current output or 0-10 V voltage output) and working voltage of the pressure transmitter meet your application requirements.
Check the appearance: Carefully check whether the transmitter is physically damaged and whether the interface is clean.
Installation location: Install the pressure transmitter on the pipe or container that needs to be measured, ensuring that it is installed securely. Usually the pressure interface should be vertical to the ground.
Connect the power supply and output: According to the instructions of the pressure transmitter, connect the power cord and output cord. Current-type transmitters need to be connected in series in the control loop, and voltage-type transmitters need to be connected in parallel on the measuring equipment.
Zero point calibration: Perform zero point calibration in a no-pressure state to ensure that the output of the transmitter is 4 mA or 0 V when there is no load.
Testing and debugging: Turn on the power and gradually increase the pressure. Observe whether the output signal changes linearly with pressure. Adjust settings until the transmitter’s output meets operating requirements.
Record data: Record the output current or voltage value under different pressures. To ensure that the pressure transmitter can accurately reflect pressure changes throughout the entire working range.
Periodic calibration: Check and calibrate the pressure transmitter regularly to ensure its accuracy and stability in long-term operation.

Can a pressure transducer be used to measure volume?

Pressure transducer cannot be used to directly measure volume. Pressure transmitters are used to measure medium pressure.

However, we can also calculate the volume indirectly through measurements from a pressure transmitter. But this requires other parameters.

For example, in a closed tank, if the temperature of the gas can be kept constant. Then measuring the pressure of the gas can be used to calculate the volume of the gas. This is based on Boyle’s law, which states that the pressure of a gas is inversely proportional to its volume.

Or, in some liquid tanks, if the tank is regular, then we can calculate the cross-sectional area of the tank. Then by measuring the pressure at the bottom of the container, we can calculate the volume of the liquid. Our volumetric recorders also enable this conversion.

Our Pressure Transmitter Markets and Applications

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Different Types of Pressure: Absolute, Gauge, Sealed Gauge and Differential Pressure

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Static Pressure Sensor and Transmitter Features and Applications

The static pressure sensor or static pressure transmitter is based on atmospheric pressure or absolute vacuum, and compares the difference…

Pressure Transducer Price

There are a number of factors, that will impact the price of a pressure transducer.

The biggest differentiator is whether you can use a standard, off-the-shelf pressure transducer or if you need a custom pressure transducer.

For an off-the shelf pressure transducer, pressure transducer prices will be most affected, by the level of accuracy required for your application.

The more accurate, typically the more expensive the pressure transducer.

Extended reading: What is a pressure sensor?

Choose the right pressure transducer for your application

Sino-Inst offers over 20 Pressure Transmitters. A wide variety of Pressure sensors options are available to you. Such as free samples, paid samples. Sino-Inst is a globally recognized manufacturer of Pressure sensors, located in China.

Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

Request a Quote

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KimGuo11

drurylandetheatre.com

SI-390 General Purpose Industrial Pressure Transducer

Posted on July 5, 2019 by KimGuo11

Industrial pressure transducers are essential devices in various industrial processes. They are designed to convert a liquid or gas(air) pressure into an electrical signal, which can be used to measure or control different industrial applications. SI-390 General Precision Industrial help improve the efficiency and reliability of various industrial processes. Support OEM.

RFQ More Pressure Sensors

Features
Specifications
Drawings

Features of SI-390 Industrial Pressure Transducer

Compact structure and easy installation.
Advanced diaphragm / oil-filled isolation technology.
High stability and high reliability.
Resistant to vibration and radio frequency interference.
316L stainless steel isolation diaphragm structure.
High precision, all stainless steel structure.
Miniature amplifier, voltage and current signal output.
Strong anti-interference and long-term stability.
Forms and structures are diversified and easy to install and use.
Wide measuring range, which can measure absolute pressure, gauge pressure and sealed vacuum pressure.
Resistant to vibration and shock.
Zero and full range can be adjusted.

Specifications of SI-390 Industrial Pressure Transducer

Measuring medium: various liquids, gases or vapors compatible with 316L stainless steel
Measuring range: -0.1kPa ~ 0 ~ 0.01kPa ~ 100MPa
Overload: 1.5 times full scale pressure or 110 MPa (minimum value)
Pressure type: gauge pressure, absolute pressure, sealed reference pressure
Power supply: 15~30VDC 15~28 VDC 15~28 VDC
Output signal: 4~20mADC 0~10/20 mADC 0/1~5/10VDC
Transmission method: two-wire system; three-wire system; three-wire system:
Accuracy: Typical: ±0.25% FS Maximum: ±0.5% FS
- (including nonlinearity, hysteresis, and repeatability)
Long-term stability: Typical: ±0.1%FS Maximum: ±0.2%FS
Zero temperature coefficient: 0.03% FS / ° C (≤ 100kPa) 0.02% FS / ° C (> 100kPa)
Full temperature coefficient: 0.03% FS / ° C (≤ 100kPa) 0.02% FS / ° C (> 100kPa)
Working temperature: -30~ 80°C
Storage temperature: -40～100°C
Load resistance: ≤ (U-15) / 0.02Ω
Electrical connection: cable connection, aviation hoe, Hessmann components
Housing material: stainless steel 1Cr18Ni9Ti
Process interface: M12×1 N20×1.5 or G 1/4 external thread
Protection level: IP65
Explosion-proof mark: ExiaIICT6 (intrinsic safety explosion-proof type)

Drawings of SI-390 Industrial Pressure Transducer

Industrial Pressure Transmitter drawings

What is the pressure transducer?

Pressure transducer/transmitter is a device that converts pressure into pneumatic signal or electric signal for control and remote transmission.

It can convert the gas, liquid and other physical pressure parameters felt by the load cell sensor into a standard electrical signal (such as 4-20mADC, etc.). Use secondary instruments such as indicator alarms, recorders, and regulators for measurement, indication, and process adjustment.

Industrial Pressure Transmitters are precision-engineered to fit most industrial pressure measurement applications. Sino-Instrument offers industrial pressure transmitters with the display, 4-20ma output.

The industrial pressure transmitter can work as a natural gas pressure transducer, water pressure transmitter.

The piezoresistive pressure transmitter uses an advanced micromechanical etching process. By diffusing four high-precision resistors with temperature compensation on the silicon wafer. Form a Wheatstone bridge. Due to the piezoresistive effect, the resistance values of the four bridge arm resistors change. The bridge is out of balance. The sensitive element outputs an electrical signal corresponding to a pressure change. The output electrical signal is amplified by the compensation of the non-linear correction circuit to generate a voltage and current signal that has a linear correspondence with the input pressure.

It uses a programmable KELLER-ASIC chip called a “programmable resistor.” The “programmable resistance” chip allows the transmitter to be installed and calibrated with automatic test equipment to improve product quality and reduce costs.

The transmitter uses 6SC series bellows. The piezoresistive silicon pressure sensor is housed in an oil-filled capsule. The dielectric voltage is isolated by the stainless steel diaphragm and transmitted to the wafer through the oil-filled liquid.The sealed pressure gauge has a TAB (Automatically Insulated Tape) sensor. The sensor floats freely in oil to ensure stability and durability.The “programmable resistor” line has a network of programmable resistors. The network adjusts the zero / gain and temperature coefficients.

All SI-390 series transmitters undergo pressure and temperature cycle compensation test procedures. At the end of the compensation test, various parameters are automatically calibrated. And adjusted by computer-controlled test equipment. A final inspection is then carried out and results are obtained. Check if it is correct. The adjustment position is correct and meets the requirements.

The transmitter is very reliable and economical. It is suitable for process control and pressure measurement in petroleum, chemical, metallurgy, power, light industry, textile, building materials, hydrogeology, food, medicine, environmental control, papermaking, and other industries.

SI-390 Industrial Pressure Transmitter is used for process control in the petrochemical, chemical and HVAC industries. They allow measurement results to be transmitted to the control center.The compact, rugged design makes these instruments suitable for a variety of applications. Including hydraulic and pneumatic, vacuum, test equipment. Level measurement, pressure control, compressor control, pump protection and many other processing and control operations. A wide range of electrical and process connection options can meet almost all requirements.

Hydraulics and pneumatics
Test equipment
Pump and compressor control
Liquid level measurement
Off-road equipment
Compressor control
Industrial engines
Industrial refrigeration

These types of transducers are also known as pressure transmitters.

Since a 4-20mA signal is least affected by electrical noise and resistance in the signal wires, these transducers are best used when the signal must be transmitted long distances.

It is not uncommon to use these transducers in applications where the lead wire must be 1000 feet or more.

Extended reading: How to calibrate HART pressure transmitters

How to choose the right industrial pressure transducer?

Pressure transmitters are pressure sensors whose electronics can generate measurement signals. The signal can be remotely transmitted via cables, buses or radio frequency.

Consider the unit’s measurement range and maximum pressure capacity, it’s precision, its operational environment (temperatures, vibrations, etc.), the nature of the measured medium and the type of output signal.

1. In order to ensure the stable operation of the product,
- it is recommended to consider the actual pressure value,
- and the range of possible migration when selecting the measurement range.
- The maximum pressure should be within the measurement range,
- and the company will complete the migration before leaving the factory.
2. The product is installed vertically on the field pressure interface, and the display level is facing the observer.
3. For transmitters with zero pressure and negative pressure, please indicate the range of the range in the order.
4. Intrinsically safe explosion-proof products are limited to products with a pointer head.
5. Qiping diaphragm type transmitter measurement range is 0 ~ 70kPa … 35MPa.
6. When M3 is selected, the ambient temperature range of the transmitter is -20~60°C;
- when M4 is selected, the ambient temperature range of the transmitter is -30~70°C.

Want to know more about pressure transmitter?

This video gives you the answers to your basic questions about pressure and pressure transmitters.

More Related Industrial Pressure Sensors

**High Frequency Dynamic Pressure Sensor**

**Hygienic / Sanitary Pressure Transmitter**

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Frequently
Asked
Questions

Help Center

Pressure transmitter types:

According to the working principle: it can be divided into capacitive, piezoresistive, resonant, etc. (resonant pressure transmitters can directly output digital pulse signals without going through the signal processing circuit);
According to the wiring method: it can be divided into a two-wire system, a three-wire system (one positive power line. Two signal lines, one of which is GND), a four-wire system (two positive and negative power lines, two signal lines, among them One GND), etc.;
According to the output mode: it can be divided into a voltage output, current output, digital signal output, etc.;
According to the pressure measurement range: it can be divided into general pressure transmitter (0.001～35MPa), micro pressure transmitter (0～1.5kPa), negative pressure transmitter (0～-100kPa), etc.;
According to accuracy: can be divided into high accuracy transmitter (0.1% or 0.075% level) and general transmitter (0.5% level);

Pressure transmitters are widely used. Typical examples are constant pressure water supply, pipeline monitoring, hydraulic systems, automated testing, etc. Used for air pressure, hydraulic, oil pressure testing. There are many users who cooperate with us. We The engineers have accumulated rich field experience.

Sino-Instrument offers 10 Industrial Pressure Transducer products.

These are wireless pressure transmitters, pressure transmitter with display, and water pressure transmitter. A wide variety of Industrial Pressure Transducer options are available to you, such as free samples, paid samples.

The top applying countries are China (Mainland), Hong Kong, and the United States, which supply 96%, 2%, and 1% of wireless pressure transmitter respectively.

Industrial Pressure Transmitter products are most popular in North America, Domestic Market, and South America.

Sino-Inst is a company that designs and manufactures OEM pressure transducers and transmitters featuring various pressure sensor technologies to tailor designs to individual applications.

Our Indutrial pressure transducers are available in various pressure ranges with customized and electrical or pressure connections, as well as analogue and digital interfaces. Contact us today for a standard product quotation or to discuss a custom solution.
Contact Sino-Inst for a standard product quotation or to discuss a custom OEM solution.

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KimGuo11

drurylandetheatre.com

SI2088-W Wireless Pressure Transmitter

Posted on July 3, 2019 by KimGuo11

Wireless Pressure Transmitter is often used for outdoor pressure measurement. Battery-Powered Self-Contained Pressure Monitoring Solution.

Wireless Pressure Transmitter is based on GPRS mobile network or NB-iot IoT transmission. Powered by solar panel or 3.6V battery, or wired power supply. NB-IOT / GPRS / LoraWan and eMTC, a variety of networks are available. , Full-scale compensation, high-precision and high-stability amplifier IC temperature compensation function. The medium pressure can be measured as 4 ~ 20mA, 0 ~ 5VDC, 0 ~ 10VDC, 0.5 ~ 4.5VDC and other standard electrical signals. There are many ways to connect product processes and electrical connections, which can best meet the needs of users.

Sino-Inst offers a variety of Wireless Pressure Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.

Features of SI2088-W Wireless Pressure Transmitter

SI2088-W Wireless Pressure Transmitter is a lithium battery-powered digital pressure gauge with wireless data transmission. The built-in high-precision pressure sensor can accurately display the pressure in real time. It has high stability and long-term stability.

This digital pressure gauge is equipped with a large-size high-definition LCD liquid crystal display and a built-in MCU. With the mature GPRS / LTE / NB-IoT network, the pipeline pressure on the spot is uploaded to the data center.

The product adopts a cast aluminum shell with good shock resistance. The built-in SUS630 stainless steel diaphragm has good media compatibility. It can measure gases, liquids, oils and other non-corrosive media to stainless steel.

The product function is practical, the reporting frequency can be set. The pressure collection frequency can be set. It has a real-time pressure alarm function. Once the pressure is abnormal, the alarm data can be sent in time. The alarm pressure value can be set. Two consecutive detections exceed the set value and the detection frequency is automatically increased At the same time, the amount of change will be detected. After the amount of change exceeds 10% of the total range (default, can be set), the data will be reported immediately.

In addition, it also has a variety of pressure unit switching, error clearing, and one-key wake-up functions. It is especially suitable for unmanned, inconvenient power supply, such as fire pipelines, fire terminals, fire pump rooms, and urban water supply, which require remote monitoring.

Five-digit LCD display, visual key operation
Remote parameter setting, panel parameter setting
Ultra-low power consumption design, powered by 7.2V lithium battery.
Using GPRS / LTE / NB-IoT network, stable signal
One key to wake up
High precision, full range coverage
Message format can be customized (default Modbus_RTU protocol)

Sino-Inst provides products that can replace Rosemount 3051S wireless pressure transmitter. Sino-Inst also provides maintenance and calibration of Rosemount and WIKA pressure measurement products.

Specification Wireless pressure transmitter

Pressure Range:	-100kPa ～ 60MPa
Pressure type:	Sealed gauge pressure / absolute pressure / differential pressure
Accuracy:	± 0.2 ~ ± 0.5% FS
Display:	5 digit LCD display, white backlight
Network standard:	GPRS / NB-IOT / LoraWan wireless signal transmission (customized according to demand)
Skyline:	External
Sampling interval:	It can be set arbitrarily, in seconds, if it needs real-time collection, set to 0
Upload interval:	It can be set arbitrarily, in minutes, the fastest is 1 minute, if you need to set it to 0
Wake-up mode:	timer, button, alarm wake-up
Configuration mode:	local configuration / remote configuration
Upload information:	data of each channel, battery information, network status, self-test status, signal strength, alarm information, etc.
Power supply:	3.6V@13Ah section X2
Power consumption:	standby current ≤50uA, sending average current ≤100mA
Working temperature:	-20 ℃ ～ 70 ℃
Storage temperature:	-40 ℃ ～ 85 ℃
Vibration:	≤3g / 10Hz … 150Hz (IEC 60068-2-6-2007)
Protection level:	IP67
Pressure-sensitive diaphragm:	Stainless steel 316L
Shell material:	304 steel joint + aluminum alloy shell
Installation method:	Vertical and horizontal installation

Battery operated wireless pressure transmitter

The wireless pressure transmitter sensor is a battery-powered low-power / wireless digital output digital pressure gauge.

Low power consumption design. 3.6V / 7.2V lithium battery can be selected for power supply (ER34615M is recommended).
It can report 70,000 times during NB-IoT communication. Battery-powered, ultra-low power operation. Battery life reaches 2-5 years (affected by upload interval time).

Drawings of SI2088-W Wireless Pressure Transmitter

How Wireless Pressure Transmitter Works ?

Install the wireless pressure transmitter on the pipeline.

When the medium in the pipeline acts on the sensitive element, it is pressed.

Its internal circuit detects an electrical signal proportional to the process pressure.

After the signal is accurately amplified and compensated by the linear amplifier circuit.

Enter the microprocessor to measure, process and display data.

And wirelessly transmit the measurement data to the remote terminal equipment.

The wireless pressure transmitter adopts the wireless remote transmission module added on this basis. It can form a pressure acquisition system with our intelligent wireless receiving terminal.This system changes the transmission mode and switching power supply mode of RS485 and 4-20mA in the industry. It uses 3.6V lithium battery power supply. This simplifies the installation and saves the cost of customer wiring. The purpose of environmental protection. The product is widely used in various industrial pressure measurement systems. Such as oil fields, power, petrochemical and some occasions where wiring is inconvenient.

How Does a Pressure Transmitter Work?

Pressure Transmitter Calibration

Applications of SI2088-W Wireless Pressure Transmitter

Wireless pressure transmitters are suitable for measuring non-viscous liquids, vapors and gases, etc.

Fire water pipe network
Heating
Smart Water
Medical equipment
Other occasions requiring wireless pressure monitoring
Advanced HVAC Systems
Hydraulic / Pneumatic Systems
Agriculture Equipment
Energy Generation and Management
Pool / Spa Pump Monitoring

Wireless hydrostatic level transmitter

The battery operated hydrostatic level transmitter integrates the functions of liquid level acquisition, wireless reporting and local digital display.

The construction of the wireless liquid level transmitter is simple and ready to use. It is mainly suitable for places where power is not available on site and remote data transmission is required. It can be widely used in liquid level monitoring in urban water supply and drainage, sewage treatment, hydrology and water resources, fire protection, industry and other fields.

Of course, the wireless pressure transmitter can also be customized on other instruments. Such as wireless differential pressure transmitter, wireless absolute pressure transmitter, wireless temperature transmitter, wireless liquid level transmitter, etc.

Anti-corrosive Submersible Level Transmitter

Wireless Pressure Transmitter Price

Wireless Pressure Transmitter Price will cost more than ordinary pressure transmitters.

Extended reading: How to calibrate HART pressure transmitters

The above parameters will affect the price of the pressure transmitter.
Sino-Inst, as the manufacturer of wireless pressure transmitter, offer you with the best price.

Sino-Inst offers 5 wireless pressure transmitter products. These are wireless pressure transmitters, wireless differential pressure transmitter, and wireless temperature transmitter.

A wide variety of wireless pressure transmitter options are available to you, such as free samples, paid samples. Sino-Inst is wireless pressure transmitter manufacturer, located in China.

Wireless pressure transmitter products are most popular in North America, Domestic Market, and South America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and ISO14001 certification.

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KimGuo11

drurylandetheatre.com

Pressure Transmitter Calibration

Posted on July 3, 2019 by KimGuo11

Pressure transmitter calibration is what you need to do before you install the pressure transmitters. Also called pressure transducer calibration, or pressure sensor calibration.

In this article, we will share pressure transmitter calibration using hart communicator.

Pressure transmitters used in the process industries are very durable and reliable instruments.

Even so, they still require periodic maintenance and calibration to ensure optimal performance.

RFQ Pressure Transmitter

Before we start to calibrate the pressure transmitter, we should know:

What is span in pressure transmitter?

Span value:
The difference between two minimum value and maximum value of readings is known as a span value.

As shown in fig. below span = 20mA – 4mA

Zero Value:
The value of readings at zero lines (Y-axis) is known as zero value as shown in the figure.

How Often Should You Calibrate a Pressure Transmitter?

Pressure transmitters require regular maintenance and calibration to ensure optimum performance.

There are no specific rules for the calibration of pressure transmitters. However, this depends on the regulations the company must comply with and the purpose of the calibration. Examples include safety specifications, application requirements, process conditions or as part of standard maintenance.

General industry practice is to calibrate pressure transmitters every 1 to 3 years based on the above conditions.

If it is found that there are obvious errors, or it is more important, the calibration cycle can be shortened.

Extended reading: Pressure Sensor Applications-Featured Industry Applications

how to calibrate a 4-20mA pressure transmitter

Once you have established the calibration interval and MPE, you are ready to perform the actual calibration procedure on your pressure transmitter.

The best-practice recommendation is:

Mount the transmitter in a stable fixture free from vibration or movement.
Exercise the sensor or membrane before performing the calibration.

This means applying pressure and raising the level to approximately 90 percent of the maximum range.
For a 150 psi cell that means pressurizing it to 130–135 psig. Hold this pressure for 30 seconds, and then vent.
Your overall results will be much better than if you calibrate “cold.” cent of the maximum range.
For a 150 psi cell that means pressurizing it to 130–135 psig.
Hold this pressure for 30 seconds, and then vent.
Your overall results will be much better than if you calibrate “cold.”
Perform a position zero adjustment (zero the transmitter).

This is important because the orientation of the fixture used for calibration may be different than the way the transmitter is mounted in the process.
Failing to correct for this by skipping this step can result in nonconformance.
You may like:
Magnetostrictive level transmitters
Magnetostrictive level sensor
Begin the Pressure Transmitter Calibration procedure.

Typically this means three points up (0 percent/50 percent/100 percent) and then three points down.
The 4–20 mA output should be 4 mA, 12 mA, and 20 mA at the three points (or the correct digital values for a smart transmitter).
Each test point should be held and allowed to stabilize before proceeding to the next.
Normally that should take no more than 30 seconds.
You can use more points if you require higher confidence in the performance of the instrument.
Compare the results of your pressure transmitter to your reference device.
Document the results for your records.

Pressure transmitter calibration formula

There is a formula that we can easily use to convert most (or all) units utilizing 4 to 20 mA signal to mA units.

There are others out there but this is the simplest I know.

Below is a simple formula for pressure to current conversion.

For example:

the range is : 0 to 10 Bar

Full range = 10 Bar

Displayed or measured value: 7 Bar

15.2 mA is the equivalent current value of a 7 Bar pressure.

（Read more about: Common Units Of Pressure）

For Value or range which is not starting with zero ( with a vacuum range), use below linear interpolation formula.

You can also encode this to excel for easier conversion.

If you want to know and calculate the error,

Just subtract the True value with your computed value.

Error = Measured Value – True Value.

If the Pressure Transmitter has an accuracy of 0.5% of the range,

then 0.005 x 7= +/-0.035 Bar,

you can use this as the tolerance to determine a pass or fail result.

Or you can ask the user for their respective tolerances.

Read more about: What Is 0-10V Signal Output?

How to calibrate pressure transmitter with hart communicator

Equipment required for Pressure Transmitter Calibration

Pressure transmitter, multimeter, HART communicator

The basic procedure for Pressure Transmitter Calibration

Isolate the Pressure Transmitter from the Process.
Slowly open the vent plug and the vent valve to release the pressure.
Connect the multimeter with the transmitter and ensure that output is 4ma when 0 pressures are applied.
Connect the handheld test pump (pressure source) to the transmitter.
Ensure there is no leak.
Apply pressure range at 0%, 25%, 50%, 75%, 100% and check there is any error.
If there is any error calibration should be done.

Read more about HART Pressure Transmitter

If the transmitter is the analog transmitter

Apply 0% pressure as per LRV with handheld test pump and check multimeter if it is not 4ma adjust the zero pot in the transmitter and correct transmitter output to 4ma
Apply 100%pressure as per the URV and correct 20ma in multimeter by adjusting span pot in the transmitter
Repeat these steps to rectify the error.

In case of SMART Transmitter

We have to use HART communicator, connect the communicator with the transmitter select the HART Communicator Menu for lower range value trim and upper range value trim.
Basic Set up – Calibration – Zero Trim/Sensor Trim —Lower/Upper range value trims.
HART communicator will automatically calibrate the transmitter.
Restore the process connection
Take the transmitter on line. Ensure there is no leak

a small example of five-point calibration is given below

Low range value=0psi

upper range value=200psi

This calibration can work for Rosemount 3051 calibration.

Preparing for Field Calibration of Differential Pressure Transmitters

The usual practice is to disassemble the joint of the pressure guiding tube and the differential pressure transmitter, and then connect to the pressure source for calibration. It is troublesome and labor-intensive. The most worry is that there will be leakage or the pressure guiding pipe will be broken when disassembling and assembling the joint.

No matter what type of differential pressure transmitter, the positive and negative pressure chambers have exhaust, drain valves or cocks. This provides convenience for on-site calibration of the differential pressure transmitter, so that it can be calibrated without removing the pressure guiding tube. Differential pressure transmitter.

But make a fitting with the same thread as the vent, drain valve or cock.

When the differential pressure transmitter is calibrated, first close the positive and negative valves of the three-valve group. Open the balance valve, and then loosen the exhaust and drain valves to vent.

Then use a self-made connector to replace the vent, drain valve or cock connected to the positive pressure chamber.
The negative pressure chamber is kept unscrewed, allowing it to vent to the atmosphere.

The pressure source is connected with the self-made joint through the rubber tube. Close the balance valve. And check the air circuit sealing.

Then connect the ammeter (voltmeter) and the hand-operated communicator into the differential pressure transmitter circuit, and start the calibration after power-on and preheating.

Field Calibration of Conventional Differential Pressure Transmitters

First adjust the damping to zero state, first adjust the zero point. Then add full pressure to adjust the full scale, so that the output is 20mA. The adjustment should be fast in the field. Here is a quick adjustment method for zero point and span.

When the zero point is adjusted, it has almost no effect on the full scale, but when the full scale is adjusted, it has an effect on the zero point. When there is no migration, the effect is about 1/5 of the range adjustment amount, that is, the range is adjusted upward by 1mA. The zero point will move upward by about 0.2mA ,vice versa.

E.g:
The input full scale pressure is 100kPa, the reading is 19.900mA.
The range-adjusting potentiometer makes the output 19.900+(20.000-19.900)×1.25=20.025mA, and the range increases by 0.125mA. Then the zero point increases by 1/5×0.125=0.025, and the zero-point potentiometer makes the output 20.000mA.

After the zero point and full scale adjustment are normal, check the middle scales, and make fine adjustments if they are out of tolerance. Then carry out the adjustment work of migration, linearity and damping.

Smart Differential Pressure Transmitter Field Calibration

The intelligent differential pressure transmitter is between the input pressure source and the output 4-20mA signal. In addition to machinery and circuits, there is also a microprocessor chip that operates on the input data.

Therefore, the field calibration method of intelligent differential pressure transmitter is different from that of conventional differential pressure transmitter.

The differential pressure liquid level transmitter has been calibrated according to customer requirements in terms of range, accuracy, linearity and other parameters. And mark the range, accuracy, etc. on the nameplate of the differential pressure liquid level transmitter. As long as the parameters such as the density of the measured medium meet the requirements of the nameplate, there is usually no need to adjust.

If the customer needs to adjust the span or zero position, please adjust according to the following methods. Assuming that the range of the differential pressure liquid level transmitter is 0~10 meters:

Unscrew the back cover of the differential pressure liquid level transmitter, connect an external standard 24VDC power supply and an ammeter (requires an accuracy of 0.2% or higher) to adjust.
When there is no liquid in the differential pressure liquid level transmitter. Adjust the zero point potentiometer so that the output current is 4mA.
Pressurize the differential pressure liquid level transmitter to the full scale (10 meters). Adjust the full-scale resistor so that the output current is 20mA.
Repeat the above steps two or three times until the signal is normal.
Please input 25%, 50% and 75% respectively to check the deviation of the differential pressure liquid level transmitter.
For non-water media, when the differential pressure liquid level transmitter is calibrated with water, it should be converted according to the pressure generated by the actual use of the medium density. For example, when the density of the medium is 1.3, the 1.3m water level should be used to calibrate the 1m range.
After adjustment, tighten the back cover.
The calibration cycle of the differential pressure liquid level transmitter is once a year.
The HART intelligent differential pressure liquid level transmitter of Sino-Inst can be selected, which is convenient to adjust the range of the differential pressure liquid level transmitter.

Learn more about Pressure Transmitter Calibration

When you buy a pressure transmitter, for example, you have the instrument range, which is the pressure range the device can support.

This range covers the overpressure that might occur in the device.

The measuring range covers the values where the transmitter works properly, omitting the overpressure zone.

The lower range limit (LRL) and upper range limit (URL) define this range.

Inside the measuring range, you’ll find the calibration span, the range in which your device will be working, depending on your application.

The calibration span covers the difference between your upper range value (URV), the maximum value your transmitter can read, and the lower range value (LRV), the minimum value the device can read.

So there you go!

You should also know that each instrument has a minimum and maximum calibration span it can support.

If you go below or over these limits, you’ll lose accuracy in your readings.

Make sense? Let me give you an example, just to make it clearer.

Let’s say you want a pressure transmitter with a measurement range of -100 to 200 kilopascals (kPa).

This device can measure pressures as low as -100 and as high as 200 kPa.

If your application just requires pressure between -20 to 50 kpa, then this will be your calibration range.

Your calibration span is the URV-LRV.

By the numbers: 50 – (-20) = 70 kPa.

Therefore, you get a calibration span of 70 kPa, which falls inside the span range (10 to 200 kPa).

A pressure transmitter or pressure sensor is a device that measures pressure in a liquid, fluid, or gas.

Pressure transmitters are commonly used to measure the pressure inside of industrial machinery, in order to alert the user before a catastrophe occurs.

Extended reading: Pressure Sensor Applications-Featured Industry Applications

Yes, pressure transducers require calibration.
Pressure transducers are used in many applications to provide accurate, real-time data on how systems work. Calibration is critical to maintaining the accuracy of pressure sensors. And it’s not a one-time process.

If the sensor deviates from its specified pressure range, it may cause erroneous pressure readings. This results in degraded device performance and possible security issues.

Calibration allows users to be completely confident that their pressure transducers are performing correctly and accurately measuring the desired pressure range.

If you cannot find an answer to your question in our Pressure Transmitter Calibration you can always contact us and we will be with you shortly.

Contact Support

Conclusion:

It is normal for the pressure transmitter to have a certain error. But if the error is too large, it needs to be calibrated. There are two types of Pressure Transmitter Calibrations: conventional method and intelligent calibration. no matter where
Kinds of preparations must be done before calibration, and then calibrate and debug through the handheld operator.

There are no mandatory fixed requirements for Pressure Transmitter Calibration. Generally, enterprises can formulate them by themselves. Normally, they can be calibrated once a year. Crucially, the calibration cycle can be shortened.

About how to calibrate the pressure transmitter, and what needs to be paid attention to during the process of Pressure Transmitter Calibration. If you still have questions, please feel free to contact our engineers.

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KimGuo11

drurylandetheatre.com

SI-151 Hydrostatic Level Sensor

Posted on June 28, 2019 by KimGuo11

Hydrostatic Level Sensor (Best Price), also called Hydrostatic level transmitter. Continuous level measurement in liquid applications with pressure sensors.

Hydrostatic Level Sensor measures the hydrostatic pressure by the submersible pressure sensor. The static pressure of the liquid is proportional to the height of the liquid. Then the static pressure was converted into an electrical signal. Convert to analog signal output or 4-20mADC. With digital display. For water level measurement, hydrostatic level sensor is a low cost type. Different types of measuring cells are used in level measurement based on the hydrostatic principle.

Lightning protection, anti-corrosion, explosion-proof optional. IP68 is optional.

Sino-Inst offers a variety of Hydrostatic Level sensors for industrial level measurement. If you have any questions, please contact our sales engineers.

More Hydrostatic Level

Features of Hydrostatic Level Sensor

Standards:

CE
FCC
RoHS compliant
China RoHS

Level measurement with hydrostatics is totally unaffected by foaming or vessel installations
Ceramic measuring cells offer excellent long-term stability and high overload resistance
Metallic measuring cells also cover larger measuring ranges
Level/depth measurement
4 to 20 mA or digital (S3L) output
Flush ceramic diaphragm
Easy submersible installation
Choice of two pressure ranges
Standard union connection and extended cable and capillary tubing 10 m (32.8 ft)

Best Price from
Hydrostatic Level Sensor Manufacturer

Specifications of Hydrostatic Level Sensor

Measurement form and range	0 ～ 1 ～ 200mH2O
Allow overload	2 times full scale pressure
Operating temperature	-20 ～ 80 ℃
Temperature compensation	-10 ～ 70 ℃
storage temperature	-40 ～ 80 ℃
Accuracy (including nonlinearity, repeatability, hysteresis)	0.2% FS (typical) 0.5% FS (maximum)
Stability error	0.2% FS (typical), 0.5% FS (maximum)
Temperature drift coefficient	0.01% FS (typical, range is not less than 5mH2O), 0.03% FS (typical, range is less than 5mH2O)
output signal	(4 ～ 20) mA (two / three wire system), (0 ～ 10/20) mA, (0 ～ 5) V, (1 ～ 5) V,) 0 ～ 10) V
Power supply	15 ～ 36 VDC (calibration voltage 24VDC)
Load (Ω)	Current output type <(U-15V) /0.02A, current output type> 5K
Shell material	Aluminium Alloy
O-ring	fluoro rubber
Diaphragm	316L stainless steel
cable	Special waterproof breathable cable
Protection level	IP68 (pressure sensor part), IP65 (junction box transmitter part)

If you need more than 200meters, please refer to Deep Wells Water level sensor.

If you measure less than 5meters, you can also check the Hydrostatic level transmitter-Rod Type.

Applications of Hydrostatic Level Sensor

Hydrostatic level sensors measure the pressure generated by a static head of liquid. Use hydrostatic level sensors to measure fluid levels in Tanks. And applications like storage tanks, processing vessels, header tanks, pump inlet heads, and others. Hydrostatic pressure is used to determine the liquid height.

SI-151 Hydrostatic Level Sensor application

Inventory Management
Storage Tank Monitoring
Neutralization Tanks
Plating Lines
Waste Sumps
Clarifiers
Overflow Protection

If you need a liquid level sensor with longer service life, you can refer to Magnetostrictive level sensor

Hydrostatic level measurement: Measuring Principle

The basic working principle of Hydrostatic Level Sensor is static pressure level measurement.

In liquid, the pressure generated at a certain depth is generated by the weight of the medium itself above the measurement point. It is proportional to the density of the medium and the local acceleration of gravity.

The formula P = ρgh reflects the proportional relationship between them.

Where P = pressure, ρ = medium density, g = gravity acceleration, h = depth of measurement point.

Therefore, the physical quantity measured by the input liquid level gauge is actually pressure. It can be understood by the calibration unit mH2O of the input level gauge. The actual liquid level must be obtained by conversion after knowing the two parameters of density and gravity acceleration. In the industrial field, such conversion is usually performed by a secondary instrument or PLC.

The Hydrostatic Level Sensor mainly measures corrosive liquids such as hydrochloric acid, hydrogen peroxide, etc. Or chemical and electroplating wastewater. Mainly used in measuring corrosive media. It has the advantages of strong corrosion resistance and stable performance.

Let’s see how does a hydrostatic level sensor work ?

Video source: https://www.youtube.com/watch?v=T2OPoEod_jM&feature=emb_logo

What is a hydrostatic gauge? Or, What is a hydrostatic level sensor?

Hydrostatics is the science of fluids not in motion.

A hydrostatic level sensor is a form of a level probe, that is used especially for level monitoring, by measuring the hydrostatic pressure, in a virtually static liquid at a pre-determined level of submersion.

A hydrostatic level sensor is a submersible pressure transmitter, that has a pressure diaphragm, where the inner side of the diaphragm is vented to atmospheric pressure, through a vent tube in the cable, and the outer side is in contact with the liquid, and measuring the static pressure of the liquid column above the transmitter.

This static pressure is basically caused by the weight of the fluid on top of the transmitter, and is used to calculate the level of the liquid.

level measurement by using the hydrostatic pressure measurement

How does a hydrostatic level sensor work? Or How is hydrostatic pressure measured?

When considering a new level sensor for level measurement applications, it is often hard to find information on how the different types of level sensors, like the hydrostatic level sensors respectively hydrostatic pressure sensors, are working.

Recently, I explained level measurement by using the hydrostatic pressure measurement.

In closed geometries, such as enclosed tanks and vessels, generally, flush pressure sensors or pressure transmitters are used, which can be screwed into the vessel from the outside.

Pressure sensors are therefore particularly suitable, in applications of free-standing tanks and vessels.

A submersible pressure transducer or a flush pressure sensor measures the height-dependent weight-force of the liquid column, also known as hydrostatic pressure.

This pressure measurement is directly proportional to the liquid level respectively liquid column, at the measuring point of the pressure sensor.

It is, therefore, necessary, for the measurement of level, that the pressure sensor is placed as close as possible to the level of the vessel’s bottom.

The measured hydrostatic pressure then directly corresponds to the height of the liquid column, from the ground-level measurement point to the surface level of the medium.

So, the filling height is calculated from the distance of the medium surface to the measuring point by the pressure measurement.

The weight force of the liquid column, thus the hydrostatic pressure, however, is not only directly proportional to the filling height but also varies with the specific gravity of the medium and the force of gravity.

Extended reading: Hydrostatic Pressure Transmitter

Hydrostatic level sensor in use

The simplicity of using a hydrostatic level sensor makes it the instrument of choice wherever level needs to be measured, no matter if in a vented tank, vessel, lake, river, or reservoir.

In most cases, it is suspended by the cable to the desired level of measurement, or just submerged and allowed to sink to the bottom of the resource.

It does not matter what the structure of the tank, basin, or natural geometry is or if it has any obstructions, ledges, or complex shape, a hydrostatic level sensor will always measure the pressure of the liquid unaffected by such disturbances.

As the hydrostatic level sensor commonly is a gauge pressure sensor, it automatically compensates for the atmospheric pressure changes, so the pressure measured represents only the pressure of the liquid, caused by the liquid’s specific gravity and the vertical distance to the surface.

Therefore, the hydrostatic level sensor accurately measures the level of the liquid, by calculating the distance from the measuring point to the surface level via the measured pressure.

A hydrostatic level sensor may be calibrated in the meters water column to allow for standard gravity or local gravity.

For very high accuracy level monitoring often the temperature of the media may also be considered to take the temperature effects on the specific gravity into account.

The hydrostatic level sensor is a specialized sensor for level monitoring, most commonly used in the water and wastewater industry.

Its simple use and reliable and accurate measurement technology make it one of the most commonly used level sensors by far.

Extended reading: Capacitive water level sensor

FAQ

How does a hydrostatic level sensor work?

The hydrostatic level sensor is based on the principle that the measured static pressure of the liquid is proportional to the height of the liquid. It is made with an advanced isolated diffused silicon sensitive element or a ceramic capacitive pressure sensitive sensor. The static pressure is converted into an electrical signal. After temperature compensation And linear correction. Converted into a standard electrical signal (generally 4 ~ 20mA / 1 ~ 5VDC). The hydrostatic level sensor can also be called “static pressure liquid level gauge, liquid level transmitter, liquid level sensor, water level sensor”.
Read more about: What Is A Submersible Level Transducer?

How is hydrostatic pressure measured?

The hydrostatic pressure can be measured by a pressure sensor.
Principle of hydrostatic pressure measurement:
When the liquid level transmitter is put into a certain depth in the liquid to be measured, the pressure on the liquid-facing surface of the sensor.
The formula is: ρ = ρ .g.h + po
In the formula:
p: pressure on the liquid face of the transmitter
ρ: measured liquid density
g: local gravity acceleration
PO: atmospheric pressure on the liquid surface
h: the depth of the transmitter into the liquid
At the same time, the pressure of the liquid is introduced into the positive pressure chamber of the sensor through the air-conducting stainless steel. Then connect the atmospheric pressure PO on the liquid surface to the negative pressure chamber of the sensor. To offset so on the back of the sensor, the pressure measured by the sensor is: ρ .g.h. Obviously, by measuring the pressure p, the liquid level depth can be obtained.
Extended reading: Static pressure vs dynamic pressure vs total pressure

What is the hydrostatic level sensor?

A hydrostatic pressure level sensor (Submersible Level Transmitter) is a pressure sensor that measures liquid level based on the principle of static pressure measurement. It can also be called “static pressure liquid level gauge, liquid level transmitter, liquid level sensor, water level sensor”

What is the water level sensor?

The water level sensor is an instrument that can convert the water level parameter of the measured point into the corresponding power signal in real time. It is mainly composed of a fully sealed isolation membrane oil-filled sensor and a built-in high-performance microprocessor.
There are many types of water level sensors. There are three common types of ultrasonic liquid level sensors, servo liquid level sensors, and static pressure liquid level sensors. Due to the differences in their working principles and performance, their applications are also different.

What is the ultrasonic level sensor?

The ultrasonic level sensor is a non-contact liquid level sensor. Ultrasonic sensors are sensors developed using the characteristics of ultrasound. Ultrasound is a mechanical wave with a vibration frequency higher than that of sound waves, which is generated by the vibration of the transducing wafer under the excitation of voltage. It has high frequency, short wavelength, and small diffraction phenomena. In particular, it has good directivity and can be ray and directional propagation. Ultrasound has a great ability to penetrate liquids and solids. Especially in the opaque solids of sunlight, it can penetrate a depth of tens of meters.

What is meant by hydrostatic pressure?

Hydrostatic pressure refers to the pressure on the surface of an object when it is stationary or moving at a uniform speed. Its unit is pa. Static pressure plus dynamic pressure equals total pressure.
In fluid mechanics, it mainly refers to the following three types:
The pressure is generated by the fluid at rest.
The pressure is perpendicular to the direction of fluid movement when the fluid is flowing.
The gauge pressure value is measured in the fluid without being affected by the flow velocity.

Sino-Inst offers over 10 Hydrostatic Level Sensors. About 50% of these are Submersible Level Sensors, 40% are water level meters, and 40% are liquid treatment.
A wide variety of Hydrostatic Level Sensor options are available to you, such as free samples, paid samples.
Sino-Inst is a globally recognized supplier and manufacturer of Hydrostatic Level Sensor instrumentation, located in China.
The top supplying country is China (Mainland), which supply 100% of
Hydrostatic Level Sensor respectively.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.
Hydrostatic Level Sensor products are most popular in Domestic Market, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers with ISO9001, ISO14001 certification.

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KimGuo11

drurylandetheatre.com

SI-10 Liquid pressure sensor

Posted on June 28, 2019 by KimGuo11

Liquid pressure sensor is widely used for pressure measurement of various liquids. Like water or oils tank. IP68 waterproof.

Liquid pressure sensors also called a water level pressure sensor, or water pressure transducer. SI-10 liquid pressure sensor uses waterproof device to achieve IP68 waterproof rating. Like: water, oil pressure for pipe or tank. SI-10 liquid pressure sensor is a piezoresistive silicon pressure sensor. The main component of liquid pressure sensor is diffused silicon, with high stability. SI-10 liquid pressure sensor supports analog output, and 4-20mA, HART. For open tank, the liquid pressure sensor is easier to install than the differential pressure level measurement.

Sino-Inst offers a variety of liquid pressure sensors for industrial level measurement. If you have any questions, please contact our sales engineers.

More Pressure Sensors

Features of SI-10 Liquid pressure sensor

Comparison-of-water-pressure-transmitter-and-flat-waterproof-pressure-transmitter

Adopt stainless steel integral components. High precision strain process. After highly reliable amplifier circuit and precise temperature compensation. With stable performance, good EMC electromagnetic compatibility and impact resistance.
National standard 304 stainless steel seal welding. The structure is small and compact. Has good moisture resistance and excellent media compatibility.
Adopt waterproof device to achieve IP68 waterproof rating.
Integrated structure design, electrical part adopts fully sealed waterproof structure.
Can be customized flat membrane waterproof pressure sensor. The diaphragm isolation technology is adopted, and the test head has no pressure hole. There is no clogging of viscous medium during the measurement. It is suitable for pressure measurement and control of viscous media such as chemical coatings, paints, mud, asphalt, crude oil and other harsh environments.

Extended Reading: Fluid pressure sensor

Specifications of Liquid Pressure Sensor

Range:	-0.1 ～ 0, 1-5, 10, 20, 30-60, 80-150MPa (other ranges can be customized)
Comprehensive accuracy:	0.1% FS, 0.25% FS, 0.5% FS
Output signal:	4-20mA (2-wire system), 0-5 / 1-5 / 0-10V (3-wire system)
Power supply voltage:	24DCV (9 ～ 36DCV)
Medium temperature:	-20 ～ 75 ℃
Ambient temperature:	normal temperature (-20 ～ 65 ℃)
Load resistance:	current output type: maximum 800Ω; voltage output type: greater than 50KΩ
Insulation resistance:	greater than 2000MΩ (100VDC)
Response time:	<1mS
Sealing grade:	IP68
Long-term stability:	0.1% FS / year
Vibration effect:	In the mechanical vibration frequency 20Hz ～ 1000Hz, the output change is less than 0.1% FS
Electrical interface:	waterproof sealed outlet
Thread connection:	G1 / 4, M20 × 1.5 other threads can be customized.

Applications of SI-10 Liquid pressure transducer

Off-Highway Vehicles
Natural Gas Equipment
Semiconductor Processing
Power Plants
Refrigeration
Robotics
HVAC

How does a water pressure sensor work?

The core of the water pressure sensor is usually diffused silicon. The working principle of the water pressure sensor is that the pressure of the measured water pressure directly acts on the diaphragm of the sensor, so that the diaphragm produces a micro-displacement proportional to the water pressure. As a result, the resistance value of the sensor changes. Use an electronic circuit to detect this change. And convert and output a standard measurement signal corresponding to the pressure.

About the working principle of water pressure sensor, WIKA made a great introduction. Of course, if you need to know more about how the water pressure sensor works, please refer to Wikipedia: Pressure sensor

A pressure sensor may also be used to calculate the level of a fluid. This technique is commonly employed to measure the depth of a submerged body (such as a diver or submarine), or level of contents in a tank (such as in a water tower).

For most practical purposes, fluid level is directly proportional to pressure. In the case of fresh water where the contents are under atmospheric pressure, 1psi = 27.7 inH20 / 1Pa = 9.81 mmH20.

The basic equation for such a measurement is:

where P = pressure, ρ = density of the fluid, g = standard gravity, h = height of fluid column above pressure sensor

https://www.drurylandetheatre.com/industrial-process-pressure-transmitters/

SI-503K Gas Pressure Transducer

SI-706 Combined Pressure and Temperature Sensor-Dual function

Liquid pressure sensor Calibration

If the transmitter is used for a period of time, it may cause a change in metering performance. There will be zero drift, and the measurement error will increase. Therefore, it is necessary to perform regular calibration.

The accuracy of the calibrator used for calibration should be more than 3 times the required calibration accuracy.

Use the pressure calibrator to input the standard pressure values of 0%, 25%, 50%, 75%, and 100% of the range to the transmitter in the forward and reverse directions.

Check whether the current output signal is within the allowable accuracy range. If it is out of tolerance, it needs to be adjusted.

The adjustment method is as follows (4 ~ 20mA output):

(1) Input a standard pressure of 4mA with a pressure calibrator. Adjust the ZERO (zero) potentiometer. Make the 4mA current output within the accuracy range;
(2) Input a standard pressure of 20mA with a pressure calibrator. Adjust the SPAN (range) potentiometer. Make the 20mA current output within the accuracy range;
(3) ZERO and SPAN will contain each other. Repeat steps (1) (2) until the current output of 4mA point and 20mA point meets the accuracy requirements at the same time. Then check whether the current output of 25%, 50% and 75% range points meet the accuracy requirements. The transmitter is qualified if it meets the requirements.

Differental pressure liquid level sensor

SMT3151LT differential pressure level transmitter is usually used to measure the liquid level in a closed container. The differential pressure level transmitter uses the differential pressure generated by the gravity of the liquid to measure the liquid level in the container.

The high-pressure side measuring tube is always filled with water due to steam condensation, keeping the pressure constant. The low-pressure side measuring tube forms a communication device with the container. The pressure changes with the liquid level in the container.

Sino-Inst offers overs 100 DP transmitters, for liquid level, pressure measurement. Our differential pressure (dp) level transmitters suit to measeure water and other liquid level.

A wide variety of DP level transmitters are available to you, such as SMT3151LT Differential pressure level transmitter.

SM3151LT liquid level pressure-differential pressure transmitter

Water pressure sensor

Water pressure sensors are usually used to measure the water level in the water tank or the rate of change of the water level. The sensor is mounted on top of an open tube submerged in the container.

As the water level rises, the air above the water in the tube is compressed, which increases the pressure on the sensor. An analog-to-digital converter (ADC) is used to convert the signal from the sensor to a digital value.

They can also be used to measure the pressure in running water pipes (for example, in a water supply system). It automatically determines whether it is necessary to start the pump to increase the flow rate.

They can be used to measure the depth of submerged objects. For example, in deep sea diving.

Of course, we can also calculate the liquid level based on water pressure. Or you can directly refer to our static pressure level transmitter.

Q & A

How does pressure sensor work?

What is the working principle of a pressure sensor?
A pressure sensor works by converting pressure into an analog electrical signal.
The demand for pressure measuring instruments increased during the steam age.
When pressure sensing technologies were first manufactured,
they were mechanical and used Bourdon tube gauges to move a needle,
and give a visual indication of pressure.
Nowadays we measure pressure electronically using pressure transducers and pressure switches.

What is a capacitive pressure sensor?

Capacitive pressure sensors typically use a thin diaphragm, as one plate of a capacitor.
The applied pressure causes the diaphragm to deflect and the capacitance to change.
You may like: Diaphragm Seal Pressure/ Differential Pressure Transmitters
This change may or may not be linear, and is typically on the order of several picofarads out of a total capacitance of 50-100 pF.
The change in capacitance may be used to control the frequency of an oscillator or to vary the coupling of an AC signal through a network.
The electronics for signal conditioning should be located close to the sensing element,
to prevent errors due to stray capacitance.
Read more about Capacitive pressure transducer [What is & How does it work]

What are the various types of sensors used to measure pressure?

Pressure measurements can be taken to determine a range of different values,
depending on whether the pressure is relative to the atmosphere,
vacuum conditions, or other measuring factors.
Pressure sensors are instruments that can be designed
and configured to detect pressure across these variables.

Absolute pressure sensors are intended to measure pressure relative to a vacuum,
and they are designed with a reference vacuum enclosed within the sensor itself.
These sensors can also measure atmospheric pressure.
Similarly, a gauge pressure sensor detects values relative to atmospheric pressure,
and part of the device is usually exposed to ambient conditions.
This device may be employed for blood pressure measurements.
For more information on the differences between the gauge and absolute pressure.
More about: Absolute Pressure Vs Gauge Pressure.

How to take off a high pressure sensor on thr liquid line?

Generally, the pressure sensor is installed behind the pressure valve. When you need to remove the pressure sensor, simply close the pressure valve.
When purchasing a pressure transmitter, the manufacturer will recommend configuring a valve block. Or according to the measurement situation, install the pressure guiding tube. This can facilitate the installation and disassembly of the pressure transmitter, while ensuring continuous flow of the pipeline.

How do you test a pressure sensor?

There are 3 commonly used detection methods for pressure sensors. Hope it can help you.
1. Pressure test. The method of detection is to power the sensor. Use your mouth to blow the air hole of the pressure sensor. Use the voltage file of a multimeter to detect the voltage change at the output of the sensor. If the relative sensitivity of the pressure sensor is large, this amount of change will be significant. If there is no change at all, you need to use a pneumatic source to apply pressure.
Through the above method, you can basically detect the condition of a sensor. If accurate testing is required, a standard pressure source is required. Give pressure to the sensor, and calibrate the sensor according to the pressure and the change of the output signal. And when conditions permit, the temperature detection of relevant parameters.
2. Zero point detection. Use the voltage range of the multimeter to detect the zero output of the sensor under no pressure. This output is generally a voltage of mV level. If it exceeds the technical specifications of the sensor, it means that the zero deviation of the sensor is out of range.
3. Detection of bridges. It mainly detects whether the circuit of the sensor is correct. It is generally a Wheatstone full-bridge circuit. Use the ohm file of the multimeter. Measure the impedance between the input terminals and the impedance between the output terminals. These two impedances are the input and output impedances of the pressure sensor. If the impedance is infinite, the bridge is disconnected. It means there is a problem with the sensor or the definition of the pin is not correct.

What is the difference between pressure switch and pressure transmitter?

Pressure Switch:
When the pressure in the system is higher or lower than the rated safety pressure. The disc in the sensor moves instantaneously. Push the switch connector on or off by connecting the guide rod. When the pressure drops or rises to the rated recovery value, the disc resets instantly. The switch automatically resets. Or simply put, when the measured pressure exceeds the rated value, the free end of the elastic element is displaced. Push the switching element directly or after comparison. Change the on-off status of the switching element. To achieve the purpose of controlling the measured pressure. The elastic elements used in the pressure switch include single-turn spring tube, diaphragm, diaphragm box and bellows.
Pressure Transmitter:
When the pressure signal acts on the sensor. The pressure sensor converts the pressure signal into an electrical signal. Amplified by differential amplifier and output amplifier. Finally, the V / A voltage and current are converted into a 4-20mA standard current output signal in linear correspondence with the measured medium (liquid) level pressure.

Pressure sensors for corrosive liquids and gases

Sino-Inst’s absolute pressure, gauge pressure and real gauge pressure and miniature pressure sensors are produced from the beginning. Can meet the most demanding tests and measurement specifications in some of the harshest environments. From general industrial process requirements to highly specialized sensors used in pressure hazardous locations.

Special products include micro-sized, ultra-micro-sized high-pressure high-temperature and flushing diaphragm models. To fit the space with narrow gaps.

Sino-Inst provides pressure and differential pressure sensors based on silicon or foil-based strain gauge technology. Very suitable for many types of applications in automotive, aerospace, chemical, semiconductor manufacturing and general industry.

All our pressure products are highly configurable. Can meet the unique requirements and environment of customers. On some pressure sensor models, intrinsically safe and explosion-proof options for use in hazardous locations are provided.

If you need special modifications or complete custom designs to meet your unique requirements, please feel free to contact us.

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KimGuo11

drurylandetheatre.com

What is an Ultrasonic level transmitter?

The basics of ultrasonic level transmitters – how they work and what they’re used for

Ultrasonic Level Transmitters working principle

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Ultrasonic level transmitter data sheet

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Frequently Asked Questions

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What is a ultrasonic level sensor?

How does ultrasonic level measurement work?

What is the difference between radar and ultrasonic level transmitter?

Description

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What is a low-pressure transducer?

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No Liquid Fill Diaphragm, Sanitary Clamp Fitting

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Drawing of SI-350 Sanitary Pressure Transmitter

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Features of SI-300 Pressure Transducer 4-20mA/Voltage

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