Category Archives: Pressure

Pressure Transducers and Transmitters Manfacturer, China

 
A pressure transducer also called a pressure transmitter,
is a transducer that converts pressure into an analog electrical signal.
Pressure transmitters are used to measure the pressure,
or level of industrial liquids and gases.
The output is transmitted to a control system.
Accurate and stable process measurements ensure the safe,
reliable, and profitable operation of your plant.
Sino-Instrument is pressure transmitters manufacturer in China.
We offer all types of pressure transmitters.
Like Direct Mounted, flange-mounted, single flange,
double flange, Remote Diaphragm Seals, High Static, Digital Remote.
Most of our pressure transmitters are used in oil, liquids,
and other process variables.
Pressure transducers are generally available with three types of electrical output;
millivolt, amplified voltage, and 4-20mA.

4-20 mA Output Pressure Transducers

These types of transducers are also known as pressure transmitters,
work with HART communicators.
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.
Choose the right pressure transducer for your application:

SI-151 Hydrostatic Level Sensor

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

Hydrostatic Level Sensor

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.

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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 range0 ～ 1 ～ 200mH2O
Allow overload2 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 error0.2% FS (typical), 0.5% FS (maximum)
Temperature drift coefficient0.01% 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 supply15 ～ 36 VDC (calibration voltage 24VDC)
Load (Ω)Current output type <(U-15V) /0.02A, current output type> 5K
Shell materialAluminium Alloy
O-ringfluoro rubber
Diaphragm316L stainless steel
cableSpecial waterproof breathable cable
Protection levelIP68 (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
level measurement by using the hydrostatic pressure measurement

Read more about: Differences! Static pressure vs dynamic pressure vs total pressure

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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SI-10 Liquid pressure sensor

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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.

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More Pressure Sensors
Hydrostatic Level Sensor
Submersible Pressure Transducer
Hydrostatic level transmitter-Rod Type
Deep Well Water Level Sensor

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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SI-PCM261 Submersible Pressure Transducer

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Submersible pressure transducer with 4-20ma is a conventional liquid level measurement sensor. Such as water cans. Cable 0m ～ 300m, minimum range 0.5m.

Submersible pressure transducer with 4-20mA output is Hydrostatic Level Sensor for level measurement. Submersible pressure transducer is based on the measured liquid static pressure proportional to the height of the liquid Principle. Convert static pressure into electrical signal. After temperature compensation and linear correction. Convert into standard electrical signal. Generally 4 ～ 20mA / 1 ～ 5VDC. It can also be called “static pressure liquid level gauge, liquid level transmission Device, liquid level sensor, water level sensor “. Bullet, cage, and flush tip models are available. Applications include pumps, downhole, oil tanks, lime slurry, and water tanks. There is a miniature submersible transmitter that is low power voltage.

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

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More Hydrostatic Level Sensing

Features of SI-PCM261 Submersible Pressure Transducer

SI-PCM261 Submersible Pressure Transducer
  • Linear deviation is less than 0.02%
  • Accuracy over temperature range exceeds ±0.01 ft (3 mm) of water
  • Stainless steel sensor diaphragm, ballast, and casting
  • Polyurethane vented sensor cable is durable and rugged
  • Dry air moisture barrier system provides atmospheric compensation
  • No on-site calibration required

Specifications of Submersible Pressure transmitter

RangeVarious ranges from 0 ～ 0.5m to 0 ～ 300m
Measuring mediumOil, water and other media compatible with 316 stainless steel
Accuracy0.5% FS (standard type); 0.2% FS; 1.0% FS
Pressure overload200%
Protection levelIP65
Power supply24VDC (15 ～ 36VDC)
Output4 ～ 20mA ， 1 ～ 5V
Temperature drift-10 ℃ ～ 50 ℃ <0.5% FS; -20 ℃ ～ 85 ℃ <1.0% FS
Insulation resistance> 100MΩ at 500VDC
Anti-electromagnetic / RF interference30V / m, 10KHz to 500MHz
Long-term stability<0.2% FS / year
Compensation temperature0 ℃ ～ 50 ℃
Operating temperature0 ℃ ～ 70 ℃
storage temperature-40 ～ 100 ℃
Shock / vibration resistance100g, 10ms / 10g, 10 ～ 2000Hz
Pressure transmission diaphragm material316 stainless steel
Probe housing material1Cr18Ni9Ti
Cable sheath materialPolyethylene or polyamide
Sealing materialNitrile rubber
Junction box housing materialCast aluminum, surface sprayed
Explosion-proofEx IaII CT6; Ex IaII BT4
Protection levelIP68

You may like: Explosion Proof Pressure Transmitter for Hazardous locations

If you are measuring the fuel tank level, you can choose a magnetostrictive liquid level sensor with higher accuracy and longer service life.

Applications of Submersible Pressure transducer

  • Level measurement in vessel and storage systems
  • Overfilling and no-load operation monitoring
  • Level measurement in rivers and lakes
  • Deep well and groundwater monitoring
  • Battery-operated level measuring systems

Submersible pressure transducers are designed for measuring ground and surface water pressure, temperature and water level. The Sino-Inst submersible pressure transducer can send data up to 1000 feet (304.8 m) long.

The submersible pressure transducer is suitable for a wide range of applications. Urban water supply and drainage. Sewage treatment, water tanks. Oil tank oil tanks, hydrogeology, reservoirs, rivers and oceans and other fields. The compact structure, simple change and flexible installation method provide users with convenience for submersible pressure transducer. 4 ~ 20mA, 0 ~ 5v, 0 ~ 10mA and other standard signal output methods are selected by users according to their needs.

If you need to measure the liquid level of the ground tank, you can refer to the pressure level sensor.

Submersible pressure transducer installation

Precautions for the use and installation of the submersible level sensor:

1. When the liquid level transmitter is transported and stored, it should be restored to the original packaging and stored in a cool, dry and ventilated warehouse.

2. If an abnormality is found during use, turn off the power supply. Stop using it, and check it.

3. Connect the power supply according to the wiring instructions.

How to install the submersible level sensor ?

Total Time:

The ground terminal of the input liquid level gauge should be reliably grounded. The power shield should be connected to it.

When the transmitter is installed on the side, the bending radius of the air guide cable should be greater than 10 cm. Avoid excessive bending to damage the air guide cable.

In the occasions with large vibration. Wire can be wrapped around the transmitter. Use steel wire for shock absorption. So as not to break the cable.

The installation direction of the transmitter is vertical. The input installation position should be far away from the liquid inlet and outlet and agitator.

When measuring the level of flowing or agitated liquid. Usually the steel pipe with inner diameter Φ45mm is fixed in water. Then put the input level gauge into the steel pipe and use it. Make small holes at different heights on the opposite side of the liquid flow direction, so that the water can enter the pipe smoothly.

When the liquid level gauge is installed in a stationary deep well or pool, the steel pipe with an inner diameter of about Φ45mm is usually fixed in the water. Then put the input level gauge into the steel pipe and use it. Make small holes at different heights to allow water to enter the pipe.

When the medium fluctuates greatly and the air guide cable is very long. The probe should be fixed with a sleeve to prevent the probe from swinging and affecting the measurement accuracy.

Sludge, oil residue and other substances are easily deposited in the tank bottom or bilge. It is recommended to move the measuring probe at a certain height away from the bottom of the tank (cabin). In order to avoid debris blocking the probe.

If there is any problem with the submersible pressure transducer during use. You can call the Sino-Inst staff to get a timely solution.

If you need a portable instrument, we also provide Portable Ultrasonic Water Depth Gauge for water depth measurement.

What is a submersible pressure transducer?

Submersible pressure transducer is a hydrostatic pressure sensor. Because it can be put into water, the liquid level can be calculated by measuring the underwater static pressure, so it is also called throw-in water level transmitter / level transmitter /submersible water level sensor / level gauge. Submersible pressure transducer is based on the principle that the measured liquid static pressure is proportional to the height of the liquid. Use advanced isolated diffused silicon sensitive element or ceramic capacitor pressure sensitive sensor. Convert static pressure into electrical signal. After temperature compensation and linear correction. Converted into standard electrical signals (such as 4 ~ 20mA, etc.). Equipped with 2088 indicator head can also realize real-time display of on-site water level.

Read more about: Differences! Static pressure vs dynamic pressure vs total pressure

Precise level and temperature measurement with HART®communication

Measurement uncertainty of max. 0.5 %, long-term drift of 0.1 %.

And slight temperature errors make the SI-PCM261 a reliable measurement solution, for the monitoring of storage tanks and bodies of water.

The additional analog temperature output facilitates the compensation of a temperature-induced density error especially at temperatures of up to -40 … +80 °C [-40 … +176 °F].

The integrated HART® communication can be used for scaling the measuring range, and for the parameter isolation of unit, error signal, and others.

You may like the AMS TREX

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

Optimized electronics for battery operation

The modern electronic system guarantees not only a high accuracy in the long term. But also ensures a very long battery life thanks to the low power supply, low current consumption, fast response time and low-power output signals.

Safety also in hazardous areas

The optional intrinsically safe electronic system is authorized, according to the common international standards. And allows a safe worldwide application in explosive gases and vapours.

If you want buy Wika ls-10 submersible pressure sensor, you can contact us. Sino-Inst also agent for WIKA in China. If you want find the pressure sensor for liquid level measurement, to replace the WIKA, our submersible hydrostatic level transmitter, is your best choice.

FAQ

What is a pressure transducers?

The mechanical structure of Submersible pressure transducer is highly resistant to overload and corrosive media. Submersible pressure transducer has excellent sealing and anti-corrosion properties. It can be directly put into liquids (including corrosive liquids) such as water and oil for medium to long-term use. The shell and cable of PTFE material can measure a variety of highly corrosive liquids.

Do you have lighting protection?

Yes. We have. Lightning protection type Submersible pressure transducer is an outdoor type liquid level transmitter used in industrial fields that is free from frequent high-voltage overvoltage during lightning strikes and limits freewheel time and freewheeling value. The product is based on the principle that the measured static pressure of the liquid is linearly proportional to the height of the liquid level. The temperature drift is small and the accuracy is high. Imported diffused silicon sensor with long-term stability and embedded special anti-surge circuit technology. Thereby, the linear relationship between the output signal and the liquid depth is converted into a standard signal output, and accurate measurement of the liquid depth is realized. It can be widely used in water plants and sewage treatment plants with frequent lightning and surge currents.

What is the max depth?

For ordinary liquid level measurement, the range of 0m ~ 300m can already meet the needs of users. For deep well water level measurement, we can use our Deep Well Water Level Sensor, up to 1000 meters. Also supports customer customization.

Sino-Inst offers over 50 Submersible Pressure Transducer products.

About 50% of these are Submersible Pressure Transducer, 40% are Differential Pressure Gauge, and 40% are Diaphragm Seal Pressure transmitters.
A wide variety of  Submersible Pressure Transducer options are available to you, such as free samples, paid samples. 

Sino-Inst is a globally recognized supplier and manufacturer of 
Submersible Pressure Transducer, located in China. Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Submersible Pressure Transducer 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

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SI-D100 Diaphragm Pressure Gauge

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The diaphragm pressure gauge application spans from 10 mbar to 60 bar. The measuring element consists of one circular diaphragm, clamped between a pair of flanges.

The positive or negative pressure, acting on these diaphragms causes deformation of the measuring element. The magnitude of the deformation is proportional to the pressure to be measured, and it is coupled to the pointer mechanism.

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Features of the diaphragm pressure gauge

SI-D100 Diaphragm pressure gauge

  • Case and wetted parts from stainless steel
  • Wide choice of special materials
  • High overload safety up to the 10-fold full scale value
  • Process connection thread or open flange
  • Scale ranges from 0 … 60bar

You may like:

Diaphragm Seal Pressure/ Differential Pressure Transmitters

Submersible Pressure Transmitter for Level and Depth Measurement

Specifications of SI-D100 Diaphragm pressure gauge

Pressure gauges compliant with EN 837-3
Display ranges
 		0…10 mbar to 0…40 bar (unfilled)
0…60 mbar to 0…60 bar (filled)
Nominal size
 		100 mm
160 mm
Mechanical designStainless steel case with bayonet ring
Connections at bottom
the enlarged channel opening
in case of PTFE lining,
optional open flange		 Stainless steel
 
EN 837-3 accuracy
 		Class 1.6
Class 2.5 (with protecting foil)
Maximum pressure load
Static load
Dynamic load
Overload		 100 % of full scale values
90 % of full scale values
Up to 5-times, max. 40bar

Connection threads and materials of SI-D100 Diaphragm pressure gauge

Type 316L pressure gauges with stainless steel connection are available with a stainless steel diaphragm (40 to 250 mbar) , or a Duratherm diaphragm (0.4 to 40 bar).

In addition, they can optionally be produced with PTFE lining.

Options of SI-D100 Diaphragm pressure gauge

  • Inlet port orifice up to Ø 10 mm
  • Hygienic connection,
    • e.g. according to DIN 11851, DN 25 to DN 50,
    • with or without lateral cleaning valve
  • Other connection flanges according to former DIN standards
  • Special installation or connection orientation
  • Special scales such as dual ranges, fine-division (with knife-edge pointer) Stationary red pointer on the dial, or with external adjustment)
  • Maximum indicating pointer, external adjustment
  • Window acryl glass or polycarbonate (only for display ranges ≥ 0…100 mbar)
  • Micro-adjustable pointer, mechanism aluminum
  • Diaphragm with protection foil:
    • PTFE (> 40 mbar, vacuum tight), sealing PTFE;
    • Fine-silver (> 160 mbar, vacuum tight), sealing FPM;
    • Tantalum (> 160 mbar, vacuum tight upon request), sealing PFTE, others upon request
  • Up to 10-times overload protection, but max. 40 bar (600 psi) for measuring flange Ø 100 mm (3.94“) max. 2.5 bar (40 psi) for measuring flange Ø 160 mm (6.3“)
  • Other filling fluid, silicone oil for temp. down to -40 °C (flange sealing PTFE)
  • Version for temperatures > 100 °C
  • Electrical accessories

More Diaphragm Pressure Gauge Technical Guide

A diaphragm pressure gauge is a tool that measures the pressure of a gas or liquid by using a flexible diaphragm. The diaphragm will move in response to changes in pressure, and this movement is then translated into a reading on a dial.

These gauges are commonly used in industries like manufacturing, oil and gas, and chemical processing to monitor and control pressure in various processes. They are also commonly used in HVAC systems to measure the pressure of air and other gases.

Diaphragm pressure gauges are relatively easy to use and maintain, and they are often chosen for their accuracy, durability, and affordability. They come in different sizes, materials, and pressure ranges, making them versatile tools that can be used in a wide range of applications.

Diaphragm pressure gauge construction

A diaphragm pressure gauge is a device that uses a diaphragm with a known pressure to measure pressure in a fluid.

It has many different uses, such as monitoring the pressure of a canister of gas, measuring atmospheric pressure. Or recording the strength of the vacuum in a vacuum pump.

The diaphragm pressure gauge consists of a circular membrane, made from sheet metal of precise dimensions, which can either be flat or corrugated.

The diaphragm is mechanically connected to the transmission mechanism, which will amplify the small deflections of the diaphragm, and transfer them to the pointer.

The animation below shows the pressure gauge working principle.

You can see the movement of the diaphragm and the functioning of the transmission mechanism.

The process pressure is applied to the lower side of the diaphragm, while the upper side is at atmospheric pressure.

The differential pressure arising across the diaphragm lifts up the diaphragm and puts the pointer in motion.

The deflection of the diaphragm is very small (+/- 1 mm), making it necessary to use a high-ratio multiplying movement, to rotate the pointer along the full length of the scale.

The actuation of such a high-ratio transmission mechanism is possible, because diaphragm deflection is able to generate large forces.

Read more What is a diaphragm seal?

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Advantages:Disadvantages:
Versatility: can measure pressure of a wide range of fluids and gasesLimited range: may not be suitable for high or low pressures
Accuracy: provide precise measurementsSensitivity to overpressure: can be damaged and affect accuracy
Cost-effective: relatively affordableSusceptibility to damage: diaphragm can be damaged by certain fluids
Durability: made of durable materials and can withstand harsh conditionsEnvironmental factors: accuracy can be affected by changes in temperature, humidity, etc.

Pressure gauges with horizontal diaphragm allow to find suitable versions for even difficult kinds of media. Such as aggressive, contaminated or viscous media.

The stainless steel bayonet ring case is designed for applications, where a rust-resistant, sealed case of high chemical resistance is required (dirty damp, or corrosive atmosphere).

  • For measuring points with increased overload;
  • With liquid-filled case suitability for high dynamic pressure loads and vibrations (model 433.50);
  • For gaseous, liquid and aggressive media, also in aggressive environments;
  • With the open connecting flange option also for contaminated and viscous media;
  • Process industry:
    • Chemical, petrochemical, power plants, mining,
    • on-/offshore, environmental technology,
    • machine building and general plant construction

There are various types of pressure instruments. In addition to pressure sensors, pressure transmitters. Pressure gauges are also commonly used.

The function of a pressure gauge is to measure the pressure of fluids and gases in various industrial, commercial, and residential applications. Pressure gauges are used to monitor and regulate the pressure of liquids and gases in tanks, pipelines, and other containers to ensure that They are operating safely and efficiently.

The pressure gauge works by measuring the force that the fluid or gas exerts on a sensing element, which is typically a flexible diaphragm or a curved tube called a Bourdon tube. The sensing element then converts this force into a mechanical or electrical signal, which is displayed on the gauge as a pressure reading.
.

In summary, the function of a pressure gauge is to provide accurate and reliable measurements of pressure in various applications to ensure the safety and efficiency of systems and equipment.

Difference between bourdon tube and diaphragm pressure gauge

The working principle of the pressure gauge is through the elastic deformation of the sensitive element in the gauge. Then the pressure change is transmitted to the pointer by the conversion mechanism of the movement in the watch. Cause the pointer to rotate to show pressure. Sensitive element may be a Bourdon tube, diaphragm, bellows.

Therefore, the essential difference between the bourdon tube and diaphragm pressure gauge is the different sensitive components for pressure measurement.

Bourdon tube pressure gauge:
The sensitive element of the Bourdon tube is an elastic C-shaped tube bent into a circle with an oval cross-sectional area. The pressure of the measuring medium acts on the inside of the wave tube. In this way, the elliptical cross-section of the Bourdon tube will tend to be circular. Due to the slight deformation of the Bourdon tube, a certain ring stress is formed. This ring stress causes the Bourdon tube to extend outward. Since the head of the elastic Bourdon tube is not fixed, it will deform slightly. The amount of deformation depends on the pressure of the measuring medium. The deformation of the Bourdon tube displays the pressure of the measured medium indirectly by the pointer through the movement.

Diaphragm pressure gauge:
The sensitive element of the Diaphragm is composed of two membranes with circular waves connected together. The pressure of the measuring medium acts on the inside of the capsule cavity. The resulting deformation can be used to indirectly measure the pressure of the medium. The pressure value is indicated by the pointer. The capsule pressure gauge is generally used to measure the pressure of the gas, and it can also measure the micro-pressure and over-pressure protection to a certain extent. When several bellows sensitive components are stacked together, a large transmission force will be generated to measure very small pressure.

Bourdon tubes have the following advantages over diaphragm elements:

  • They cover small pressure ranges from 0 to 0.6 bar up to high pressure ranges from 0 to 10,000 bar.
  • They enable accuracies up to class 0.1 of the calibration regulations.
  • They are easier to manufacture.
  • They can easily be connected or sealed with the pressurised components. Depending on the material and pressure load, they are either soldered, welded or screwed to them.

Diaphragm pressure gauges are used when a Bourdon tube pressure gauge reaches its limits.

Extended reading: Pressure indicator transmitters

Frequently
Asked
Questions

Help Center

In a pressure gauge, a diaphragm is a flexible membrane that responds to changes in pressure by expanding or contracting. The movement of the diaphragm is then converted into a reading on the gauge, which displays the pressure of the fluid or gas being measured.

Diaphragms can be made from a variety of materials, such as stainless steel or synthetic materials like rubber or silicone. They are designed to be durable and withstand the pressure and conditions of the environment in which they are used.

The capsule pressure gauge is also called micro pressure gauge. It is suitable for measuring the low micro-pressure of liquid, gas or steam which has no explosion risk, no crystallization, no solidification, and corrosive effect on copper and copper alloys.
The capsule pressure gauge uses the capsule as a sensitive element for measuring small pressures. Measure the micro-pressure and negative pressure of the corrosive effect on the copper alloy, no explosion hazard gas. Widely used in boiler ventilation, gas pipeline, combustion device and other similar equipment.

In the pressure gauge, the pressure measured by the diaphragm is generally regarded as relative pressure. Generally, the relative point is selected as atmospheric pressure. The elastic deformation of the diaphragm under the pressure of the medium. Amplified by the gear transmission mechanism of the pressure gauge. The pressure gauge will show the relative value to the atmospheric pressure (either high or low).

There are several different types of pressure gauges that are commonly used in different applications:

Bourdon Tube Pressure Gauge: This type of gauge uses a curved tube that is attached to the gauge mechanism. As the pressure of the fluid or gas being measured increases, the tube straightens out, causing the gauge mechanism to move and display the pressure reading.

Diaphragm Pressure Gauge: As we discussed earlier, diaphragm pressure gauges use a flexible membrane that responds to changes in pressure by expanding or contracting. This movement is then converted into a reading on the gauge.

Differential Pressure Gauge: This type of gauge measures the difference in pressure between two points in a system. It consists of two pressure inputs and a gauge mechanism that calculates the difference between the two inputs.

Digital Pressure Gauge: This type of gauge uses electronic sensors to measure pressure and displays the reading on a digital screen.

Compound Pressure Gauge: This type of gauge can measure both positive and negative pressures. It uses two Bourdon tubes, one for positive pressure and one for negative pressure, to display the reading on the gauge.

Overall, the type of pressure gauge used will depend on the specific application and requirements. Each type of gauge has its own advantages and disadvantages, and it’s important to choose the right one for the job.

More pressure measurements and applications

Sino-Instrument offers over 50 Diaphragm pressure gauge products.

About 50% of these are Diaphragm pressure gauge, 40% are Differential Pressure Gauge, and 40% are Diaphragm Seal Pressure transmitters.

A wide variety of  Diaphragm pressure gauge options are available to you, such as free samples, paid samples. 

Sino-Instrument is a globally recognized supplier and manufacturer of Diaphragm pressure gauge, located in China.

The top supplying country is China (Mainland), which supply 100% of Diaphragm pressure gauge respectively.

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

SI-PCM260 Deep Well Water Level Sensor

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Deep Well water level sensor is to apply Hydrostatic Level Sensor to deep well. Well water level sensor submerged in deep well work together with submersible water pump. Range within 300m ～ 1000m.

Deep Wells Water level sensor is based on the principle that the measured liquid pressure is proportional to the height of the liquid. The piezoresistive effect of the advanced foreign isolated silicon diffused sensor is used. Change to electrical signal. After temperature compensation and linear correction, convert to 4-20mA standard electrical signal. Well water level sensor submerged in deep well work together with water pump. It is extremely difficult to replace and submit an inspection. Therefore, it adopts stainless steel cable, waterproof, sealing ring, and other four-level seals. Special cables and special water sealing technology make the transmitter highly reliable and stable.

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

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More Hydrostatic Level Measurement

Features of Deep Well Water Level Sensor:

  • Suitable for deep well / groundwater level monitoring. Large measuring range: up to 500-1000 meters.
  • Military factory grade steel cable. Cable diameter φ10mm.
  • Three European waterproof technology. 50MPa high pressure waterproof test.
  • Triple lightning protection. Core lightning protection motherboard.
  • Easy to install. Just connect two wires.

Specifications of Deep Well Water Level Sensor

RangeVarious ranges within 300m ～ 1000m
Medium temperature－20 ℃ ～ 70 ℃
Ambient temperature－10 ℃ ～ 60 ℃
Supply voltageDC 24V (12V ～ 32V)
Load characteristicsCurrent output type≤500Ω; Voltage output type: ≥3KΩ
Insulation resistance＞ 100MΩ
level of accuracyClass A: 0.2 Class B: 0.5 Class
Non-linear± 0.2% F.S
Hysteresis and reproducibility± 0.1% F.S
Long-term stability± 0.1% F.S / y
Thermal zero drift± 0.03 ％ F.S / ℃
Response time≤50ms
Maximum working pressure2 times the range
Electrical connectionsStainless steel cable connection
Material of external partsStainless steel / 316 stainless steel
Shell materialStainless steel / 316 stainless steel
Measuring mediumOil, water and other media compatible with 316 stainless steel
Protection levelIP68

Extended Reading: 3 inch (3″) Water Flow Meter

Applications of Deep Well Water Level Sensor

  • Suitable for deep water level measurement of deep wells and groundwater;
  • Pumping stations, reservoirs, water channels and other water supply and sewage projects;
  • The pressure and oil level of the gas field in the oil field;
  • Ships and marine equipment;
  • Groundwater resource management;

Extended reading: Capacitive water level sensor

Submersible pressure transmitter for level measurement

By videos below, you can know more about submersible pressure transmitter for level measurement：

Video source: https://www.youtube.com/embed/EMotg3BQjlI?rel=0

How this Water Level Sensor Works

Well Water Level Sensor is one type of Hydrostatic Level Sensor.

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.

Extended Reading: LORA water meter

Deep Well Water Level Sensor Installation:

Well Water Level Sensor and oil pipe (water pipe) go down to install together:

  1. The deep well liquid level transmitter should use the special ferrule fixing cable for the matching oil pipe (water pipe). Prevent crushing and damaging the cable. The sensor part should be installed vertically to prevent the sediment and other impurities from burying or blocking the transmitter probe part.
  2. The three-way outlet part is filled with special sealant pad and sealant. Use a wrench to tighten the compression nut. Prevent air leakage.
  3. The entire signal line leads to the interior of the power distribution cabinet. Prevent rainwater at the terminal from penetrating into the cable to cause damage. The transmitter is used for the installation of hydrology, seismic monitoring wells and reservoir dams.
  4. When the transmitter is used alone for downhole measurement. When the cable length is greater than 100 meters, an additional load-bearing wire rope should be added. Go down with the signal cable together. Protect the signal cable to prevent the signal cable from being damaged due to excessive force.

Extended reading: Magnetic water meter-ultrasonic water meter-mechanical water meter

Well Water Level Sensor calibration method:

Unscrew the protective cover. You can see the zero and full range resistors. External standard power supply and ammeter (above 0.2 pole). To adjust. Proceed as follows:

◆ In the case of no liquid in the transmitter. Adjust the zero resistor. Make it output current 4mA.
◆ Transmitter is filled to full scale. Adjust the full-scale resistor. Make the output current 20mA,
◆ Repeat the above steps two or three times. Until the signal is normal.
◆ The adjustment is completed. Tighten the protective cover.

Extended Reading: What is level transmitter working principle?

Precautions for using Well Water Level Sensor:

  1. When the static pressure input type liquid level gauge is installed. The pressure tube must be inserted vertically into the measured medium;
  2. For media with impurities or crystals. The head of the gas collector must be cleaned regularly. To prevent clogging;

Read more about: Why Is The Submersible Level Transducer The First Choice For Water Level Measurement?

FAQ

How do I check the water level in my well?

If it is a deep well, the range is wide. Can only be measured in water. Pressure type liquid level transmitter can be used in the water.
Read more about: Submersible Level Transmitter-Straight Rod Insertion

How does the water level sensor work?

The liquid level sensor mainly has contact type and non-contact type. Different water level sensors have different working principles.
1. The first type is contact. Including single flange static pressure / double flange differential pressure liquid level transmitter, float type liquid level transmitter, magnetic liquid level transmitter, input type liquid level transmitter, electric inner float level transmission Devices, electric float level transmitters, capacitive level transmitters, magnetostrictive level transmitters, service level transmitters, etc.
2. The second type is non-contact. Divided into ultrasonic liquid level transmitter, radar liquid level transmitter, etc.

Extended reading: Radar Water Level Sensor Applications

Deep Wells Water level sensor is designed for deep well level measurement. It effectively solves the problem of deep well liquid level measurement difficulty. Sino-Inst offers over 50 water level sensors. About 50% of these are Submersible level Transmitter, 40% are water meters, and 40% are level meters.
A wide variety of water level sensors options are available to you, such as free samples, paid samples. 
Sino-Inst is a globally recognized supplier and manufacturer of Submersible Pressure Transmitter , located in China. The top supplying country is China (Mainland). You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Request a Quote

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SI-2000 Differential Pressure Gauge

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Differential Pressure Gauge measures the pressure difference between two points. Quickly measure the positive, negative or DP of air or non-corrosive gas.

Differential pressure gauge measures the pressure difference between two independent pressure sources. Differential pressure gauge is a more economical method. Used for process monitoring or control, which allows a small amount of migration of process media. Suitable for air and non-flammable, non-corrosive applications. And certain air and natural gas applications. Using a simple, frictionless magnet spiral movement, it can quickly indicate the pressure of low pressure or non-corrosive gas. Whether positive, negative (vacuum is also available) or differential pressure. This design can prevent vibration, jitter, and overvoltage. No liquid needs to be filled in the watch.

Sino-Inst is a manufacturer of Differential Pressure Gauge. Sino-Inst supplies Differential Pressure Gauges made in China. DWYER 2000 Differential Pressure Gauges, Magnehelic differential pressure gauges are also available.

CONTACT US
More DP Transmitters

Features of Differential Pressure Gauge

  • Up to 81 kinds of range selection, can accurately meet your requirements
  • Using simple and unique patented double helix frictionless magnetic moving parts, you can quickly measure the positive pressure of air or non-corrosive gas, measure negative or differential pressure
  • Designed to resist shock, shock and overload protection
  • No liquid U-tube pressure gauge liquid evaporation, freezing, poisoning and leakage problems
  • Can measure fan, blower, filter resistance, furnace ventilation, orifice plate
  • Pressure drop and other system pressures. Can also be used in various purification rooms, biological safety
  • Cabinet, clean bench, dust removal equipment, medical breathing equipment, air intake
  • Sample differential pressure detection
  • Up to 63 models with different ranges and engineering units, suitable for various applications
  • Ultra-thin design: embedded thickness is only 38.5mm, overall thickness is only 52.2mm
  • Patented wave stripe decorative mask, beautiful and elegant
  • Standard accuracy up to 2%; after high precision calibration, up to 1% FS
  • Optional mirror dial to eliminate visual reading error and brushed 304 SS or plated bezel

Specifications of Differential Pressure Gauge

  • Accuracy: ±2% (ascending pressure)
  • Pressure Ranges: 0-5 thru 0-150 psi
  • Dial size: 2″, 2 1/2″, 3 1/2″, 4″, 4 1/2″ and 6″
  • Case: stainless steel
  • Body: aluminum, brass or stainless steel 
  • Wetted Material: body material, Teflon ®, ceramic and various O-ring materials
  • Medium: air and non-flammable, compatible gas (optional natural gas)
  • Shell: cast aluminum or ABS shell, plexiglass beveled panel. Dark gray coating for 168 hours salt spray test
  • Withstand voltage range: -20Hg. to 15 psi (-0.677 bar to 1.034 bar)
  • Temperature range: 20 to 140 °F (-6.67 to 60 °C)
  • Opening size: 114mm
  • Installation positioning: diaphragm for the vertical direction
  • Connector: the same 1/8″ NPT high and low-pressure connector, one pair on the side and one pair on the back
  • Weight: 500g / only
  • Standard accessories:
    • two 1/8″ NPT threaded joints for high and low-pressure joints and connected to rubber hoses;
    • two 1/8″ NPT plugs for blocking the remaining two high and low-pressure ports;
    • Three threaded countersunk mounting connectors (mounting ring, snap ring retainer are used to replace the three ports on the MP and HP metering accessories).
RANGES FOR REFERENCEPaKpaInches of WaterMM of Water Dual Scale    
0-300-0.50-.250-6 in w.ccPa or Kpa
0-600-10-.500-100-.250-62 Pa
0-1000-1.50-1.00-150-0.50-125 Pa
0-1250-20-2.00-250-1.00-250 Pa
0-3000-50-8.00-300-2.00-500 Pa
0-5000-80-10 0-500-3.00-750Pa
-30-0-300-100-200-800-4.00-1.0kPa
-60-0-600-200-500-1000-5.00-1.25kPa
-100-0-1000-300-1000-1250-6.00-1.5kPa
-250-0-2500-500-1800-2000-8.00-2.0kPa
-500-0-5000-600-2500-3000-0.50-2.5kPa
VARIOUS RANGES  CAN BE CUSTOMIZED FOR YOU

You may like: Diaphragm Seal Pressure/ Differential Pressure Transmitters

What is a differential pressure gauge?

SI-D2000 Differential Pressure Gauge

Differential pressure gauges are suitable for measuring small pressure differences between two pressure sources in an industrial process. Measure the pressure loss of the filter and observe the working state of the valve. It is widely used to measure the pressure of fan and blower, filter resistance, wind speed, furnace pressure, orifice differential pressure, bubble water level, liquid amplifier or hydraulic system pressure, etc. It is also used for air-gas ratio control and automatic valve control during the combustion process.

Differential pressure gauge is suitable for measuring the differential pressure, flow rate and other parameters of various liquid (gas) media in the process flow of industrial sectors such as chemical, chemical, metallurgy, electric power, and nuclear power. The instrument structure is all made of stainless steel. Among them, the measurement system (double bellows emergency connection parts) and the pressure guiding system (including joints, conduits, etc.) adopt special structure design and advanced technology.

Principle of differential pressure gauge

How does a differential pressure gauge work ?

Based on the pressure-sensitive element, two bellows with the same stiffness are used. Therefore, they are forced to produce the same concentrated force on the movable bracket under the same measured medium. Because the two sides of the spring sheet do not produce deflection under the action of equal moments. It is still in the original position. In this way, the gear transmission mechanism does not operate. The pointer is still at the zero position.

When different pressures are applied (generally the high-pressure end is higher than the low-pressure end), the forces of the two bellows acting on the movable bracket are not equal. The corresponding displacements are generated. The gear transmission mechanism is driven and amplified. The pointer deflection The latter indicates the differential pressure between the two.

Home > DP Transmitters > D2000 Differential Pressure Gauge

Differential Pressure Gauge Application

The SI-2000 differential gauge is ideal Where safe and reliable pressure measurement is essential:

  • Filtration Monitoring
  • Pressure Drop across a Strainer
  • Flow Rate

Dwyer Magnehelic series 2000 differential pressure gauge

American Dwyer differential pressure gauge/ Dwyer 2000 differential pressure gauge

The Dwyer 2000 series differential pressure gauge is an ultra-low-range, inexpensive, and solid structure field indicator. It uses the frictionless Magnehelic movement principle to eliminate wear, hysteresis and gaps. Without liquid filling, it will not vaporize and freeze. It can quickly indicate the low pressure and non-corrosive gas (positive pressure, negative (vacuum) and differential pressure). There are 81 ranges, the minimum range is 0-60Pa, or 0-6mm water column or 0-0.25′ water column). This design has anti-vibration, shaking and high resistance to overpressure.

Main technical indicators of American Dwyer differential pressure gauge Dwyer 2000

  • Accuracy: accuracy 2% FS (suffix 0 is 3%; suffix 00 is 4%) Rated pressure: -0.7 ～ 1Kg / cm
  • Connection: 1/8 “NPT internal thread, two pairs of high and low pressure ports, on the side and back
  • Overpressure: The vent will open automatically when it is about 1.75Kg / cm2
  • Ambient temperature: -5 ℃ ～ 60 ℃, weight 0.5Kg
  • Outer shell: cast aluminum outer shell, the main body and components pass the 168-hour salt spray test, and the exterior is dark gray coating.
  • Standard accessories: two 1/8 “NPT threaded joints, used as high and low pressure joints and can be connected with rubber tubes; two 1/8” NPT plugs; three threaded countersunk fittings.
  • According to the requirements of the National GMP Drug Production Verification Guidelines for clean workshops, we recommend selecting:
    • Add positive micro-pressure (5-10Pa) to the workshop or room, and select a 2000-60Pa micro differential pressure gauge.
    • Check the filtering effect of coarse, medium and high-efficiency air filters, use differential pressure gauges such as 2000-125, 250Pa, 500Pa or 1Kpa, and observe the pressure difference of the filter at any time to replace the filter.

Scope and model:
2000-60PA 0-60Pa,
2300-120PA, 0- ± 60Pa,
2000-125PA0, -125Pa,
2300-250PA, 0– ± 125Pa,
2000-125PA, 0-250Pa,
2300-500PA, 0- ± 250Pa,
2000-500PA, 0-500Pa,
2000-750PA, 0-750Pa

81 range specifications including 2000-30KPA.
Sino-Inst provides DWYER differential pressure gauge, micro differential pressure gauge, mechanical differential pressure gauge including MAGNEHELIC 2000 series. All products can be ordered, domestic brands include: MACROHELIC and MAGRFHELIC, price concessions, spot supply.

Differential pressure gauge price

Reference Price:
Dwyer 2000 series differential pressure gauge: USD 75.00 / pc
SI-2000 Differential Pressure Gauge: USD49.50 / pc

The exact price needs to be determined according to the product parameters and the quantity purchased.

Differential pressure gauge installation

1-Surface Mount

(1) Installation method one, as shown in the following picture 1. Drill three installation vias with an angle of 120 degrees and a diameter of 4.5mm on the installation plane. Use the corresponding short installation screws in the accessory package to match the screw holes on the bottom of the instrument. Make it secure .
  (2) Mounting method two, as shown in the following figure 2. Take three mounting brackets first. Use the corresponding installation short screws in the accessory package. Fix the mounting bracket to the three mounting screw holes on the bottom of the instrument. Then take the longest three screws. Lock with the installation plane

2-Embedded (panel) installation

Cut the installation and insertion holes with a diameter of 115.5mm on the panel. Insert the meter into the holes. See Figure 3 below. Take three mounting brackets, and use the corresponding installation short screws in the accessory package. Fix the mounting bracket to the three mounting screw holes on the bottom of the meter. Then take the longest three screws. Fasten the meter to the panel.

3-Embedded (color steel plate) installation

Cut the embedded hole with a diameter of 115.5mm on one side of the color steel plate. As shown in figure 4 below, install the A-S1 / S2 panel into the color steel plate.
The pressure port on the back of the meter is firmly installed. Among them, accessories A-S1 / S2 and A-S81 need to be purchased separately.

4-For other installation methods. see the following figure 5. Use special screws A-S9 to fix the installation with the pressure interface on the back of the instrument. Accessories A-S9 need to be purchased separately.

5-Zero adjustment

After installing the instrument, adjust the zero position. Using a suitable flat-blade screwdriver, turn the zero adjustment screw at the bottom of the transparent mask counterclockwise. Align the pointer with the zero position of the dial. During zero adjustment, both the high-pressure port and the low-pressure port can communicate with the atmospheric pressure.

6-Pressure connection

With the standard configuration accessories, according to actual needs, correctly connect the “+” and “-” pressure ports. Note that the instrument has a pair of pressure ports on the side and back. The unused pair of plug seals in the application accessories.

Differential-pressure-gauge-installation-picture-1
Differential-pressure-gauge-installation-picture-2
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Differential-pressure-gauge-installation-picture-5
Differential-pressure-gauge-installation-picture-4

FAQ

How do you hook up a differential pressure gauge?

Two pressure ports for L (low pressure) and H (high pressure). Different connections can quickly indicate gas pressure. Including positive, negative or differential pressure. Zero calibration can be directly operated externally.
Pressure measurement: Connect the pressure source to any one of the two high-pressure ports with an air pipe, and block the unused one; make one or two low-pressure ports open to the atmosphere.
Differential pressure measurement: Connect the high-pressure source to any one of the two high-pressure ports with an air pipe, and connect the low-pressure source to any one of the two low-pressure ports with an air pipe; block the two pressure ports that are not used on the meter.
Negative pressure measurement: Connect the pressure source to any one of the two low-pressure ports with an air duct, and block the unused one; make one or two high-pressure ports open to the atmosphere.

How to calibrate differential pressure gauge?

Send to Calibration Institute for calibration. Self-calibration requires equipment and qualifications, otherwise it will not be recognized.
If no report is required, you can calibrate yourself:
First, at least one certified high-precision micro-pressure gauge or pressure gauge is required as a reference standard. Then select 5-7 points in the full range and give a fixed pressure difference at both ends of the differential pressure gauge. If it is a micro differential pressure gauge, you can use a micro pressure pump to give pressure to the high pressure port. If it is a large number of differential pressure gauges, you can use a liquid pump to give pressure to the high-pressure port. Then observe the reading between the reference standard and the differential pressure gauge, record and calculate the relative error.

What is the function of a pressure gauge?

The role of the pressure gauge is used to measure and indicate the size of the pressure in the pressure product. If the pressure product does not have a pressure gauge, or if the pressure gauge fails, the pressure of the pressure product cannot be expressed. This directly threatens safety.
A sensitive and accurate pressure gauge is installed on the pressure product. The operator can operate the pressure product correctly with the pressure gauge to ensure safe and economical operation.
The pressure gauge can accurately indicate the level of the steam pressure in the pressure product. The operator can adjust the heating degree of the product according to the indicated value of the pressure gauge. In order to ensure the requirements of the gas department and the safe operation of pressure products.

Sino-Instrument offers over 50 Differential Pressure Gauge products. About 50% of these are differential pressure meters, 40% are water meters, and 40% are level meters.
A wide variety of Differential Pressure Gauge options are available to you, such as free samples, paid samples.
Sino-Instrument is a globally recognized supplier and manufacturer of Differential Pressure Gauge, located in China.
The top supplying country is China (Mainland), which supply 100% of Differential Pressure Gauge respectively.

Sino-Instrument sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Differential Pressure Gauge 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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SI-3151GP Capacitive Gauge Pressure Transducer

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Gauge Pressure Sensor (GP) is a pressure transmitter for Gauge pressure measurement. SI-3151GP Capacitive Gauge Pressure Transducers use capacitive sensing elements to measure gauge pressure.

Gauge pressure (GP) transmitters compare process pressure with local ambient air pressure. Gauge pressure transmitters have ports for a real-time sampling of ambient air pressure. There are different types of pressure measurement. Such as gauge pressure, absolute and differential pressure measurement. Among them, the gauge pressure measurement is performed using a gauge pressure transmitter. These devices are designed to measure pressure relative to ambient atmospheric pressure. The output of the gauge pressure sensor will vary depending on the atmosphere or different altitudes. Measurements above ambient pressure are expressed as positive numbers. And negative numbers indicate measurements below ambient pressure. At Sino-Inst, we offer gauge pressure transmitters for a variety of industrial applications.

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

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More Pressure Transmitters

Features of 3151GP gauge pressure transmitter

  • High-reliability micro-capacitance silicon cell
  • Long Term stability: +/- 0.1% URL / 10 Years
  • High accuracy, up to +/-0.04% of calibrated span (0.065% as standard)
  • Versatile indicator with push-button programming
  • Exceptional resistance to harsh environments
  • Hart® 5.2 multi-drop communication
  • Field repair possible with common spare parts
  • The built-in loop calibration facility
  • Large installed base
  • Exia “Intrinsically safe” or Exd “Explosion proof” versions ex stock
  • SIL2 (EN61508)

Specifications of 3151 gage pressure(GP) transmitter

Model3151GP
Measurement span0-0.10～3.5kPa(0-10～350mmH2O)
0-0.8～8.0kPa(0-80～800mmH2O)
0-4.0～40kPa(0-400～4000mmH2O)
0-20～200kPa(0-2000～20000mmH2O)
0-70～700kPa(0-0.7～7kgf/cm2)
0-210～2100kPa(0-2.1～21kgf/cm2)
0-700～7000kPa(0-7.0～70kgf/cm2)
0-2.1～21MPa(0-21～210kgf/cm2)
0-4.1～41MPa(0-41～4100kgf/cm2)
Reference accuracy
(Varies by material and measurement span)		± 0.1%, ±0.075%
Fill fluidSilicone oil (general purpose models), fluorine oil (oxygen and chlorine models)
Waterproof and dust-proof constructionIEC IP66/IP67
Explosion-proof constructionTIIS flameproof (Exd IICT4)
KOSHA flameproof
FM explosion proof, intrinsic safe and Nonincendive
ATEX/NEPSI/IECEx flameproof, intrinsic safe and Type n
INMETRO flameproof
Wetted materialSUS316 (diaphragm SUS316L), Hastelloy C, Tantalum
Power17.9 to 42V DC
Output signal4 to 20 mA DC (SFN communication)
4 to 20 mA DC (HART® communication)
MODBUS-485 signal
Process connectionsRc 1/2 or 1/2 NPT internal thread
Safety certificationSafety Integrity Level (SIL) 2 certification

By selecting from a large range of materials, we are able to customize the transmitter and supply remote seals.

We temperature compensate for the whole assembly to maintain the highest level of performance.

Selecting from 316SS, Hastelloy, Monel, Tantalum, Gold, and Ceramic.

We can custom build a transmitter to our own high standards, or to your individual specifications.

To provide high flexibility, remote seals can be fitted to any of the SI series of transmitters.

For further information, please Contact us.

Gauge Pressure Sensor Applications

Pressure transmitters are used to measure level, density, and pressure of liquids, gases or vapors. And then converted to a 4-20 mA DC signal output. The SI-3151 GP intelligent pressure transmitter can communicate with the HART Communicator.

There are many types of pressure sensors, which are widely used in:

Water plants. Oil refineries. Sewage treatment plants. Building materials. Light industry. Machinery and other industrial fields.

To achieve the measurement of liquid, gas, steam pressure.

However, different pressure sensors are required for different applications.

The pressure sensor can be used to measure some mechanical physical quantities such as: Displacement. Vibration. Angular velocity and acceleration.

It is also widely used in the measurement of thermal engineering parameters such as: Pressure. Differential pressure. Liquid pressure. And content of ingredients.

Gauge Pressure Sensor working principle

What is gauge pressure?

Gauge pressure, also known as ‘relative pressure’ or ‘vented gauge pressure’. Gauge pressure is the measurement of pressure relative to atmospheric or barometric pressure.Gauge pressure sensor has the back of the sensing element open (or ‘vented’), to provide a reference to atmospheric.
More about the Difference between absolute, gage and differential pressure.

How does a gauge pressure sensor work?

Gauge Pressure Transmitter / transducer (GP) is a pressure transmitter for Gauge pressure measurement. According to the measurement principle, it can be divided into: capacitive and diffused silicon.

Capacitive pressure sensor (capacitive type pressure transducer) is a pressure sensor that uses a capacitive sensing element to convert the measured pressure into an electrical output with a certain relationship. It is characterized by low input energy, high dynamic response, small natural effects, and good environmental adaptability. It generally uses a round metal film or metal-plated film as an electrode of the capacitor. When the membrane is deformed by pressure, the capacitance formed between the membrane and the fixed electrode changes. Through the measuring circuit, the electrical signal with a certain relationship with the voltage can be output. Capacitive pressure sensor is a capacitive sensor with variable pole distance. It can be divided into single capacitive pressure sensor and differential capacitive pressure sensor.

Read more about: What is the capacitive pressure transducer?

SMT3151 TGP-Gauge Pressure Transmitter / Transducer is a diffusion silicon pressure transmitter. The working principle of the diffused silicon pressure sensor is based on the piezoresistive effect. Using the principle of piezoresistive effect, the pressure of the measured medium directly acts on the diaphragm of the sensor (stainless steel or ceramic). Make the diaphragm produce a slight displacement proportional to the pressure of the medium. To change the resistance value of the sensor. Use electronic circuits to detect this change. And convert and output a standard measurement signal corresponding to this pressure.

3151 gage pressure transmitter

Gauge vs Absolute Pressure Sensor

In terms of pressure type, pressure sensors can be divided into gauge pressure, absolute pressure, and negative pressure.

Absolute pressure: Absolute pressure for short, is the pressure calculated from the absolute zero pressure or the vacuum starting point.

Gage pressure: refers to the pressure calculated from the atmospheric pressure of a specific place at a specific time as a starting point. Atmospheric pressure at the same location will change slightly.

Vacuum: When the measured absolute pressure is less than atmospheric pressure, the difference between the measured absolute pressure and absolute vacuum.

Negative pressure: when the measured absolute pressure is less than atmospheric pressure, the difference between the current atmospheric pressure and the measured absolute pressure, referred to as negative pressure.

The formula for the relationship between absolute pressure, gauge pressure, and atmospheric pressure: absolute pressure = gauge pressure + atmospheric pressure.

Therefore, when selecting a pressure sensor, it is generally necessary to clearly indicate the pressure type of the pressure sensor,

Gauge vs Absolute Pressure Sensor

  1. Gauge pressure and absolute pressure are based on different measurement reference points. The reference point for gauge pressure measurement is the local atmospheric pressure. Absolute pressure is the absolute vacuum zero. Absolute pressure sensors cannot replace gauge pressure sensors.
  2. In layman’s terms. When your measured object uses atmospheric pressure as the reference point, and only has the inflation action, select the gauge pressure type. When your measured object takes absolute vacuum zero as the reference point, and there are inflation and inhalation actions, it is often the absolute pressure type.
  3. The two principles of gauge pressure and absolute pressure sensor are different! Cannot be used instead!

Technical Support

Cryogenic Pressure Transducers

Cryogenic pressure transducer for low temperature pressure measurement.  -196℃～+125℃、-260℃/-350c（especial）. Sino-Inst offers a variety of Pressure Sensors for…

Sino-Instrument Gauge Pressure Transmitters, made in China, are high-performance cost-effective devices, used where long term accuracy and reliability is a priority.

SI-3151GP Advanced Transmitter Gauge Pressure Transmitters, are used to measure the pressure of gases, liquids, and steam, as well as to measure tank pressure and fluid levels.
Sino-Instrument 1151 Gauge Pressure Transmitters are high-performance cost effective devices used, where long term accuracy and reliability is a priority.
We also offer Gauge Pressure Transmitter SMT3151 TGP, for the process, oil and gas industry.

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More Featured Products:

SI-1110 Wireless Pressure Transducer

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Wireless Pressure Transducer is also called Wireless Pressure Transmitter. Wireless Pressure Transducer is a wireless remote transmission module added to the common pressure transmitter. Works with the receiver. Battery powered. Can realize true wireless working wireless transmission. This product has a variety of wireless transmission methods, including GPRS/LoRa/NB-IoT/ZigBee.

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

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More Wireless Pressure Solultions

Features of Wireless Pressure Transducer

Wireless Pressure Transmitter SI-1110
  • Five-digit LCD screen, white backlight;
  • Waterproof design, waterproof grade ≥IP66;
  • GPRS/NB-iot optional, LORA protocol can be customized development;
  • Cast aluminum explosion-proof shell, durable, beautiful product;
  • The protocol is self-edited and can be customized, timely transmission and alarm;
  • Sending interval, the buttons can be adjusted from 1 minute to 24 hours;
  • Low power consumption design, 3.6V lithium battery power supply, can support more than 15000 times;
  • Remote parameter configuration (transmission frequency, collection frequency, alarm value, etc.) to reduce maintenance costs.

Extended Reading: Digital Pressure Sensor-RS485

Specifications of Wireless pressure transducer

Dimension of wireless pressure transducer
Power SupplyInternal Battery, 2200mAh@7.4V Lithium
Pressure mediumgas or liquid compatible to wetted stainless steel
Pressure ranges-1…0~0.01bar…1000bar
Pressure typegauge(G), absolute(A), sealed gauge(S)
WirelessLoRaWANR CN470/EU868/US915/AS923Mhz,10km in view sight
Accuracy0.5%FS
Long term stability<0.1%FS/year
Relay output(2 relays)220V/3A
Indicator4 digits LCD display
Compensation temperature range-20~+85°C
Working temperature range-40~+125℃
Temperature coefficient of zero0.2%FS/10℃
Temperature coefficient of span0.2%FS/10℃
Insulation resistance100MQ@50VDC
Electrical connectionM20×1.5 female
Material of wetted part1Cr18Ni9Ti
Material of membrane316L
Material of housingcast aluminium
Process connectionM20x1.5,G1/2 or others
Overload pressure150%FS

Read more about: Common Units Of Pressure

Wireless Gateway

ChipSX1276
Spreading Factor6-12
Bandwidth7.8-500KHZ
Bitrate0.018-37.5kbps
Sensitivity-141dBm
Frequency Range137-1020MHz
Emission Power17土1 dBm
Sleep Current1.45uA
Stand_By Current1.8mA
Receiver Current12.15mA
Emission Current93mA
Max.DATA Rate300kbps
CertificationFCC&CE,IC,TELEC

Extended reading: What is flush diaphragm?

LORA

Item

Name

Function

System Configuration

Core

ARM Cortex-A53

Basic frequency

1.2GHZ

RAM

1Gbytes

Flash

4Gbytes eMMC

Communication Mode

10M/100M Internet Interface

 

GPRS/3G/4G Wireless Communication

 

Wireless Communication

Lora

Electric Performance

Power Supply

PoE +48V input

IEEE 802.3 af/at

Average Consumption

5W

Peak Power

15W

Lora output power

Type:14dBm@868MHZ

17dBm@470MHZ

Max:27dBm

Lora Receive Sensitivity

-141dBm@SF12,BW=125KHZ

Inner sensor

Temperature Sensor

Temperature Sensor

User interface(Outer)

4G Antenna Interface

4G Connect to Server

User interface(Inner)

LoraWan Antenna Interface

LoraWan Connect to Sensor

GPS Antenna Interface

Connect to the outer GPS module

PoE Interface

10M/100M Ethernet cable connect to Server

Micro Sim Card

 

USB

USB boot, Burning or update

Serial Com

Online debug

LED100

System Running Indicator

LED200

FDX-LED Mode indicator

LED201

LNKA_LED Connection status indicator

LED202

SPD_LED data rate indicator

LED203

4G mode indicator

Mechanical dimension and weight

dimension

145x95x40mm

Weight

715g

Installation

Wall mount or Holding pole

Working Temperature

Working Temperature

-40~75℃

Storage Temperature

-40~85℃

The wireless pressure transmitter has optimized the circuit design, power management, communication protocol, and realized the “micro-power consumption” design of wireless communication. Using micro-transmission power and high-sensitivity receiving strategy, it has the advantages of real-time online monitoring of battery power and so on.

The wireless pressure transmitter system is mainly composed of pressure sensor, signal processing circuit, wireless module, power management circuit, battery and antenna. On this basis, a wireless remote transmission module is added, which can form a pressure acquisition system with our intelligent wireless receiving terminal.

This system has changed the transmission mode of RS485 and 4-20mA current signal and the power supply mode of switching power supply in the past, and used 3.6V lithium battery for power supply. This simplifies the installation method and saves the cost of customer wiring. Really achieve the purpose of energy saving and environmental protection.

Read more about: Industrial pressure transmitters Working Principle

The wireless pressure transmitter is a high-precision, low-power radio transmission pressure detection instrument. Powered by lithium battery, IP65 waterproof cast aluminum casing. Support data recording and data supplementary transmission functions. No wiring, no external power supply required. Built-in 3.6V lithium battery.

In the field of the Internet of Things, there are various communication technologies at the same time.

Divided by the dimension of transmission distance, in the field of local area wireless network, there are BLE, Wi-Fi, ZigBee, etc., which are widely used in home, enterprise and other scenarios.

For wide-area wireless networks, there are LoRa, NB-IoT, etc., which are specially used for low-rate, low-power, and wide-coverage IoT services.

NB-IOT/Zigbee/Lora comparison

WiFi is ubiquitous in life, but we know very little about NB-IOT, Zigbee, and Lora. Sino-Inst compares the three wireless networking solutions from five aspects to help you understand these three technologies.

  1. Transmission distance comparison

NB-IoT: Long-distance, up to ten kilometers, generally more than 10KM; NB-IoT technology improves the power spectral density, realizes wide-area coverage, and effectively solves the problem that existing wireless signals are difficult to cover.

LoRa: Long distance, up to ten kilometers, 1~2 kilometers in cities, and 20 kilometers in suburbs;

ZigBee: short distance, 10 meters to 100 meters level;

  1. Single-network access node capacity

NB-IOT: about 200,000. Compared with traditional 2G, 3G and 4G, NB-IoT has a 50-100 times increase in uplink capacity;

LoRa: about 60,000, which is actually related to the number of gateway channels, node packet sending frequency, data packet size, etc. Generally, there are 500 to 5000;

ZigBee: more than 60,000 in theory, 200-500 in general

  1. Battery life

NB-IOT: theoretical about 10 years / AA battery, no need to charge;

LoRa: Theoretically about 10 years/AA battery;

ZigBee: Theoretically about 2 years/AA battery;

  1. Cost

NB-IOT: The cost of the module is less than 5 US dollars, and the future target is reduced to 1 US dollar. The low cost and low power consumption make NB-IOT more cost-effective and wider application range than other types of IoT;

LoRa: The module is about $5;

ZigBee: The module is about 1~2 US dollars;

  1. Transmission speed

NB-IOT: theoretical 160kbp ~ 250Kbps, generally less than 100kbps in practice, limited by low-speed communication interface UART;

LoRa: 0.3~50kbps;

ZigBee: theoretical 250kps, practically less than 100kbps, limited low-speed communication interface UART;

Wireless pressure transmitters are low-power wireless transmission digital pressure transmitters that are battery powered. This product has a variety of wireless transmission methods, including GPRS/LoRa/NB-IoT/ZigBee. Users can choose the appropriate configuration according to their needs.

The wireless digital pressure transmitter of GPRS transmission, with the mature GPRS network, uploads the pipeline pressure on site to the cloud. Users can match IP addresses and other general parameters on-site or remotely.

Wireless digital pressure transmitter with LoRa transmission. Use with LoRa gateway. It has the advantages of low power consumption, long transmission distance, strong signal penetration, and self-organized network.

NB-IoT transmits wireless digital pressure transmitter. Adopt the latest NB-IoT technology. Low power consumption, high transmission efficiency, low tariff and other advantages.

Wireless digital pressure transmitter with ZigBee transmission. It is characterized by close proximity, low complexity, self-organization, low power consumption, and low data rate.

Extended reading: Use of high temperature melt pressure sensor

Applications of wireless pressure transducer

  • Pipeling pressure monitoring
  • Machinery and oil industry
  • Paper making, pharmaceutical
  • Electric power, environmental protection and food industry
  • metallurgical and chemical industry
  • 6 Field or inconvenient power distribution

Extended reading: Featured Diaphragm Seal Pressure Transmitters

Wireless differential pressure sensor

Wireless differential pressure sensor is a wireless transmission type differential pressure sensor. Supporting test software, with display, curve recording, data storage and other functions. Mainly used for measuring and monitoring system of gas differential pressure. This product is a wireless product developed mainly for inconvenient wiring environment on site.

This product can also output the RS485 signal of the MODBUS communication protocol and the analog signal of 0~5VDC, which is truly a three-in-one product. It is convenient for on-site customers to use data collection systems in different fields.

Wireless differential pressure sensors are mainly used in:

  • Pipeline differential pressure long distance transmission
  • Filter network monitoring
  • Pipeline differential pressure monitoring
  • Power station operation inspection
  • Locomotive brake system
  • Thermoelectric unit
  • Building fire pressure monitoring
  • Industrial process detection and control
  • Laboratory pressure calibration, etc.

Extended reading: What is a pressure sensor?

Pressure transducers for sale

Diaphragm Seal Pressure Transmitter
Explosion-proof Pressure Transmitter
Capacitive Gauge Pressure Transmitter
Diffused silicon Gauge Pressure Transmitter
Wireless Pressure Transducer
Submersible Pressure Transducer
Hydrostatic Level Sensor
Anti-corrosive Submersible Level

Extended reading: Industrial Pressure Transmitters|Buy from the manufacturer

Wireless Pressure Transducer Price

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

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 wireless pressure transmitter, offer you with the best price.

Frequently
Asked
Questions

Help Center

Wireless pressure sensors are also wireless pressure transmitters.

The wireless pressure transmitter is added with a wireless remote transmission module, which can form a pressure acquisition system with an intelligent wireless receiving terminal. Including GPRS/LoRa/NB-IoT/ZigBee multiple transmission methods are optional.

Pressure transmitters can be categorized into four main types:

  • Gauge Pressure Transmitter.
  • Absolute Transmitters.
  • Differential-Pressure Transmitter.
  • Multivariable Pressure Transmitters.

Extended Reading: Liquid pressure sensor

A pressure transmitter is a device that converts pressure into pneumatic or electric signals for control and remote transmission.

It can convert physical pressure parameters such as gas and liquid sensed by the load cell sensor into standard electrical signals (such as 4~20mADC, etc.). Measurement, indication and process adjustment are carried out by supplying secondary instruments such as indicating alarms, recorders and regulators.

Related pressure measurement solutions

Cryogenic Pressure Transducers

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High Frequency Dynamic Pressure Sensor

Dynamic pressure sensor, the transmitter is a high frequency sensor. Sino-Inst offers a variety of  Dynamic Pressure Sensors for pressure measurement. If you have any questions, please…

How to Calibrate a Pressure Transmitter

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Differential Pressure Transmitter Installation Guide

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MEMS Pressure Sensors

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How Does a Pressure Transmitter Work?

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…

Extended reading: How to Calibrate DP Level Transmitter

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

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

Wireless pressure transducer 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.

Request a Quote

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SI-520 Digital Pressure Sensor

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Digital Pressure Sensor is particularly suitable for use in computer control systems.

Digital pressure sensors measure the relative pressure of hydraulic and pneumatic systems. Pressure transmitters provide absolute or differential analog readings over a wide measurement range. SI-520 Digital Pressure Sensor passes high-reliability digital circuit 485 and precision temperature compensation. RS485 half-duplex working mode. This protocol complies with the MODBUS communication protocol. And uses a subset of RMOD methods in the MODBUS protocol. Digital Pressure Sensor adopts 304ss seal and welding, and has compact structure. Digital Pressure Sensor has good moisture resistance and excellent media compatibility.

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

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Such sensors are also commonly referred to as:RS485 pressure transmitter. MODBUS protocol transmitter. RS485 bus sensor. Digital signal pressure transmitter.

Measurement medium: weakly corrosive liquid; weakly corrosive gas.

The digital pressure sensor is a new type of RS485 digital output sensor. Compared with the transmitters that generally output analog signals on the market, it is more suitable for the signal acquisition of the majority of industrial automation users.

RS485 digital sensor has broad development prospects. It is widely used in various industrial automation environments. It involves oil pipelines, water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military industry, petrochemicals, oil wells, electricity, ships, machine tools, hydraulic machinery and many other industries.

The working principle of the digital pressure sensor is that the pressure acts directly on the diaphragm of the sensor, so that the diaphragm produces a micro-displacement proportional to the pressure of the medium. The resistance of the sensor changes, and the electronic circuit is used to detect this change. And convert the output A digital standard signal corresponding to this pressure.

Extended reading: What is an air pressure transducer?

Digital Pressure Sensor Features

  • RS485 communication interface or HART communication protocol (optional)
  • Using digital compensation and non-linear correction technology
  • -10 ℃ ～ 70 ℃ digital wide temperature compensation
  • Support networking application
  • Digital display (optional)
  • Special requirements can be customized to suit various occasions

Extended reading: Pressure indicator transmitters

Specifications of SI-520 Digital Pressure Sensor

Amount-0.1～0，0-1,6,10～100MPaAmbient temperature-20～85℃
Supply voltage24VDC(10～36VDC)Medium temperature-20～85～105℃-500
output signalRS485 half duplexResponse time＜1ms
ProtocolMODBUS protocolElectrical InterfaceStainless steel waterproof sealed terminal
Precision0.1%FS、 0.25%FS、0.5%FSThreaded connectionM20 * 1.5 or according to customer requirements
Sampling rate:10 times / second.Overload capacity150%
Communication speed9600bps,n,8,1Sealing levelIP65/68
Communication speed9600bps,n,8,1Stability:≤ ± 0.15% FS / year
Serial port settingsNo parity, 8-bit data, 1 stop bit.
Serial baud rate200,240,048,009,600,000,000,000,000,000,000,000
Vibration effect≤ ± 0.15% FS / year (mechanical vibration frequency: 20Hz ～ 1000Hz)

Extended reading: High Pressure Flow Meters for Liquids-Steam-Gas

SI-520 Digital Pressure Sensor Dimensions

Digital Pressure Sensor Applicaitons

  • Various liquids, gases, or vapors compatible with 304, 316L stainless steel
  • Static & dynamic pressure measurement
  • Vacuum measurement/control
  • Barometric pressure measurement
  • Fluid level measurement
  • Gas Flow
  • Medical Instrumentation
  • HVAC

You may like: Capacitive pressure transducer [What is & How does it work]

What does 485 communication (modbus protocol) mean in a pressure transmitter?

The pressure transmitter has a common 4-20mA output and has Hart protocol. There is also 485 communication which is the modbus protocol. Today we will talk about what is 485 communication.

MCU pin outputs TTL level. TTL level means when the MCU pin outputs 0 level. In general, the voltage is 0V. When the MCU pin outputs 1 level, the voltage is 5V. Because the TTL level is generated by a signal line and a ground line. The interference signal on the signal line will be transmitted to the receiving end with the effective signal, so that the effective signal is interfered. 485 communication actually converts the TTL level from the MCU through a converter chip in the hardware layer.

485 communication features:

  1. RS-485 electrical characteristics:
    Logic “1” is represented by the voltage difference between the two lines being + (2-6) V. Logic “0” is represented by the voltage difference between the two lines being-(2-6) V. The interface signal level is lower than that of RS-232-C, so it is not easy to damage the chip of the interface circuit. And this level is compatible with TTL level, which can be easily connected to TTL circuits.
  2. The maximum data transmission rate of RS-485 is 10Mbps.
  3. The RS-485 interface is strong, which means it has good anti-noise interference.
  4. The standard value of the maximum transmission distance of the RS-485 interface is 4000 feet, in fact it can reach 3000 meters (theoretical data, in actual operation, the limit distance is only about 1200 meters). In addition, the RS-232-C interface allows only one transceiver to be connected on the bus, that is, a single station capability. The RS-485 interface allows up to 128 transceivers on the bus. That is to say, it has multi-station capability, so that users can easily set up a device network using a single RS-485 interface.

RS485 disadvantages:

RS485 bus is a conventional communication bus. It cannot do automatic arbitration of the bus. That is, data cannot be sent simultaneously to avoid bus contention. Therefore, the communication efficiency of the entire system is necessarily low, and the amount of data redundancy is large. RS485 bus is not suitable for application places with high speed requirements. At the same time, because there is usually only one host on the RS485 bus, this bus method is a typical centralized-decentralized control system. Once the host fails, the communication of the entire system is limited to a paralyzed state. Therefore, it is an important measure to do online backup of the host.

Extended Reading: Resistive Pressure Transducer

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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.
More: Industrial Pressure Sensors

A gauge pressure (GP) transmitter, compares a process pressure against local ambient air pressure.

Gauge pressure transmitters have ports to sample the ambient air pressure in real-time.
Today’s highly accurate gauge pressure transmitters can be affected by fluctuations in the local ambient pressure.
Measurements above the ambient air pressure are represented, as a positive number, while a negative number represents measurements below ambient.
A gauge pressure measurement is indicated by the letter ‘g’ following the unit of measure of the reading (i.e., inH₂O(g) or psig).
More: Gauge Pressure Transmitter

Pressure sensor is a commonly used pressure instrument, which has certain applications in many industries. It is very important for the user to determine how to detect the pressure sensor when using the pressure sensor. According to the purpose of detecting the pressure sensor, the detection items are different, of course, the detection methods will be different. Today, I will mainly introduce the three detection methods commonly used by pressure sensors. I hope they can help everyone.
Pressurization test. The checklist method is to supply power to the sensor. Blow the air holes of the pressure sensor with your mouth. Use the voltage range of the 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 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 you need accurate detection, you need to use a standard pressure source to pressure the sensor. Calibrate the sensor according to the pressure and the amount of change in the output signal. When conditions permit, temperature detection of relevant parameters is performed.
Detection of zero point. Use the voltage range of the multimeter to detect the zero point output of the sensor when no pressure is applied. This output is generally a mV level voltage. If it exceeds the sensor’s technical indicators, it means that the zero deviation of the sensor is out of range.
The detection of the bridge circuit. The main test circuit of the sensor is correct. Generally, it is a Wheatstone full bridge circuit. The ohm range of the multimeter is used. The impedance between the input terminal and the impedance between the output terminal. These two impedances It is the input and output impedance of the pressure sensor. If the impedance is infinite, the bridge is disconnected, indicating that there is a problem with the sensor or that the pin definition is not judged correctly.
Extended reading: What is a pressure sensor?

Frequently
Asked
Questions

Help Center

The working principle of the digital pressure sensor is that the pressure directly acts on the diaphragm of the sensor. The diaphragm generates a micro-displacement that is proportional to the pressure of the medium. The resistance of the sensor changes. This change is detected by electronic circuits. The output is converted to correspond to this Digital standard signal of pressure.
More about: How does a pressure transmitter work?

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 sensor based on this: 

  • Strain Gauge Pressure Transducers
  • Capacitance Pressure Transducers
  • Potentiometric Pressure Transducers
  • Resonant Wire Pressure Transducers

More about Industrial Pressure Sensors

In fact, the pressure sensor can do both digital and analog signal output.
When you order a pressure sensor, you need to confirm with the manufacturer: Do you need a local digital display? What kind of signal output is required, etc. General pressure sensors support 4-20mA, 0-5V, 0-10V and other signal outputs. Or RS485, HART and other protocols.

Extended reading: extrusion melt pressure transducer

Digital pressure switches are mainly based on electronic pressure transmitters. This provides the switch with the complete functionality of a transmitter. Simple control tasks can be performed using the integrated pressure switch. The switching points can be set individually using the digital display or an I/O link.

Extended reading: Miniature Pressure Switch

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.
More: Industrial Pressure Sensors

A gauge pressure (GP) transmitter, compares a process pressure against local ambient air pressure.
Gauge pressure transmitters have ports to sample the ambient air pressure in real-time.
Today’s highly accurate gauge pressure transmitters can be affected by fluctuations in the local ambient pressure.
Measurements above the ambient air pressure are represented, as a positive number, while a negative number represents measurements below ambient.
A gauge pressure measurement is indicated by the letter ‘g’ following the unit of measure of the reading (i.e., inH₂O(g) or psig).
More: Gauge Pressure Transmitter

Extended Reading: MEMS Pressure Sensors

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

Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Digital 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.

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SI3151 Level TRANSMITTERS Direct Mounted Flange Type

Posted on by

Sino-Instrument > level transmitter > Hydrostatic for Liquids

High-performance level measurement using a differential pressure transmitter.

  1. High-reliability micro-capacitance silicon cell
  2. All welded construction with no flange ‘O’ rings
  3. Exceptional resistance to harsh environments
  4. Electronic linearisation to correct tank shape
  5. Hart® 5.2 multi-drop communication
  6. Versatile indicator with 5-digit display
  7. Field repair possible with common spare parts
  8. The built-in loop calibration facility
  9. Wide range of flange types
  10. Large installed base

Most DP type level transmitters use an ‘O’ ring seal,

which will perish within 6 to 12 months usage in a hostile process environment. 

The FCX series transmitter uses an all-welded construction with fill fluid,

that has been subjected to high vacuum for an extended period to remove entrained air. 

This provides long term reliability not found in any level transmitter of its type.

Each application is different. Please feel free to get in touch to discuss your requirements.

Data sheet:

https://www.drurylandetheatre.com/SI/SMT3151TLT Direct-mounted level (pressure) transmitter.pdf

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