Flat Pressure Sensor for High Viscosity Fluids

Posted on August 16, 2022 by KimGuo11

Flat Pressure Sensor is a type of pressure sensor that specifically refers to the measurement diaphragm without pressure holes. Also known as a flat film pressure sensor.

Flat Pressure Sensor is a special pressure sensor most commonly used in industrial automatic control. It is widely used in the pressure measurement and control of viscous media such as chemical coatings, paints, mud, asphalt, crude oil, etc. It solves the problem that conventional products are easy to block and cannot be used continuously, etc. defect.

The Flat Pressure Sensor elastomer adopts imported materials, diaphragm isolation technology, no pressure holes in the test head, and no viscous medium clogging during the measurement process.

RFQ Pressure Sensors

Flat Pressure Sensor for High Viscosity Fluids

Main parameters of Flat Pressure Sensor

Range:	0-0.6, 1, 5, 10, 20, 30, 40, 50～200MPa
Comprehensive accuracy:	0.1%FS, 0.2%FS, 0.5%FS
Output signal:	4-20mA (two-wire system), 0-5/1-5/0-10VDC (three-wire system)
Supply voltage:	24VDC (10-30VDC)
Medium temperature:	-20～85℃～450℃
Ambient temperature:	-20～85℃
Load resistance:	current output type: maximum 800Ω; voltage output type: greater than 50KΩ
Insulation resistance:	greater than 2000MΩ (100VDC
Sealing class:	IP65
Long-term stable performance:	0.1%FS/year
Vibration influence:	within the mechanical vibration frequency of 20Hz ~ 1000Hz, the output change is less than 0.1%FS
Electrical interface:	metal sealed terminal, four-core aviation connector
Mechanical connection:	M20×1.5, G1/2-14, etc. Other threads can be customized according to customer requirements

Extended Reading: Fluid pressure sensor

Principle of Flat Pressure Sensor

The flat membrane pressure sensor test head adopts the pressure-free mode to ensure that there is no blockage of viscous media during the measurement process, and to ensure that the pressure detection works normally.

It adopts super-large diaphragm design, the core adopts highly sensitive material, diaphragm isolation technology, and integrated structure design.

The medium and high temperature pressure-sensitive chip and heat pipe structure are used in the measurement of high temperature medium, which effectively solves the drawbacks that the electronic components inside the sensor cannot withstand high temperature.

Extended Reading: Resistive Pressure Transducer

Application of Flat Pressure Sensor

Pressure measurement and control of viscous media such as chemical coatings, paints, mud, asphalt, and crude oil;
Viscous liquid, fluid;
It is suitable for pressure measurement and control in harsh working environment, explosion-proof and explosion-proof occasions;

Extended reading: LCD Display Oval Gear High Viscosity Flow Meter

We also supply a variety of chemical flow meters in corrosion-resistant materials.

More Featured Pressure Transmitters

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

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

**SI-703 Flush diaphragm pressure sensor**

**Differential pressure(DP) level transmitter**

**Remote Seal Differential Pressure Transmitter**

**Extended Diaphragm Seal DP Level Transmitter**

**Flange Mounted Differential Pressure Transmitter**

Frequently
Asked
Questions

Help Center

A pressure transducer often called a pressure transmitter, is a transducer that converts pressure into an analog electrical signal.

Although there are various types of pressure transducers, one of the most common is the strain-gage base transducer.

The conversion of pressure into an electrical signal, is achieved by the physical deformation of strain gauges, which are bonded into the diaphragm of the pressure transducer, and wired into a Wheatstone bridge configuration.

Pressure applied to the pressure transducer produces a deflection of the diaphragm, which introduces strain to the gages.

The strain will produce an electrical resistance change proportional to the pressure.

Extended reading: Pressure transmitter working principle

Fluid Pressure Sensors refers to sensors that can be used to measure the pressure of liquid media. Such as measuring pressure of Oil, Fuel and other fluid systems (select a sensor with the appropriate range for your system). Fluid Pressure Sensors have important uses. For example, the direct measurement of pressure in a fluid line. For example, put Fluid Pressure Sensors into the liquid, measure the liquid pressure, and estimate the liquid level. For example, by measuring the differential pressure of Fluid, the flow rate of the pipeline can be calculated.

Extended reading: How do fluid pressure sensors work?

There are many types of pressure sensors. Such as resistance strain gauge pressure sensors, semiconductor strain gauge pressure sensors, piezoresistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, resonant pressure sensors, etc.

Extended reading: wireless pressure transmitter working principle

Currently, the most widely used pressure sensors include:

Diffused silicon piezoresistive pressure sensor,
Ceramic piezoresistive pressure sensor,
Sputtering thin film pressure sensor,
Capacitive pressure sensor,
Sapphire pressure sensor with high temperature resistance.
But the most widely used is the piezoresistive pressure sensor, which has a very low price, high accuracy and good linearity.

Extended Reading: Electronic Pressure Switch for Air Compressor

Non Contact Flow Meters Measure Liquid Flow

Posted on August 14, 2022 by KimGuo11

What is non contact flow meter?

Non Contact Flow Meters refers to flow meters that can achieve flow measurement without contacting the fluid medium. No need to destroy the pipeline. Easy to install and remove. This is a good choice for many pipes with strict hygiene requirements or only temporary measurements.
Non Contact Flow Meters supplied by Sino-Inst are suitable for various pipe material requirements: stainless steel pipe, carbon steel pipe, copper pipe, plastic pipe (PVC, PVDF, PPR, PPH, HDPE, etc.). It can also meet the measurement of different clean fluids: various acids, chemical solvents, alcohol, beverage water, Coca-Cola, etc.

RFQ Flow Meters

Featured Non Contact Flow Meters

Types of Non Contact Flow Meters

Currently, the main Types of Non Contact Flow Meters on the market are ultrasonic flow meters and radar flow meters.

Non-contact ultrasonic flowmeters account for 90% of non-contact measurement applications. Mainly used for flow measurement of various pipeline fluids.

Non-contact radar flowmeter is suitable for non-contact flow measurement of rivers, channels, pipelines, etc.

Clamp-on ultrasonic flowmeters utilize ultrasonic technology for easy and quick installation. Applicable to a variety of materials and pipes of different diameters. Delivers incredible measurement results even when compared to electromagnetic flow products.

The non contact ultrasonic flow meter only needs to install a very small ultrasonic sensor on the outside of the pipe without destroying the pipe. It can provide completely reliable measurement results while saving a lot of installation costs.

The transducer and the converter are connected by a special signal transmission cable. In the case of fixed measurement, a junction box should be installed in an appropriate place. Clamp-on transducers usually also require mounting clamps and couplant.

Extended reading: Totalizing flow meter water

Non-contact radar flowmeters are used for flow measurement in drains, drains, and rivers. Suitable for surface flow velocity for easy measurement. It can be used for long-term flow monitoring of various non-full drainage pipes, open channels (rectangular, trapezoidal, etc.), weirs, grooves, etc. and surface runoff. Instantaneous liquid level, flow rate and flow can be automatically recorded.

It can work stably in complex environments such as inspection wells that are wet, full of toxic and harmful, flammable and explosive gases. Due to non-contact, it is suitable for monitoring of fast flow monitoring points. And compared to contact equipment, installation and maintenance are simpler. But it cannot work under long-term immersion and overflow conditions.

It can meet the needs of system monitoring and data transmission without AC power and network access. And has excellent sealing performance, with anti-corrosion, explosion-proof function.

It can be maintenance-free on a daily basis, run regularly for inspection, and no need for manual on-duty. Measurement information can be stored locally and sent wirelessly. With early warning and cloud management functions, it can be set remotely.

Strap on Flow Meter for Small Pipes Φ9.53~Φ90

Strap on flow meter X3 is widely used in flow measurement and monitoring in the production process.

Strap on flow meter X3 can meet the needs of different pipe materials: stainless steel pipe, carbon steel pipe, copper pipe, plastic pipe (PVC, PPR, PPH, HDPE), etc.

Strap on flow meter X3 almost meets the measurement of different clean fluids: various acids, alcohols, chemical solvents, alcohol, drinking water, Coca-Cola water… etc.

Product	Strap on Flow meter
Model	X3
Flow range	0.1m/s~5.0m/s
Accuracy	±2.0%
Repeatability	0.80%
Pipe size	φ6.35~φ90
Data storage	Daily, monthly, and Annual. Flow Totalizer
Analog output	4~20mA, Maximum load: 600Ω
Alarm output	DCT, Upper and lower limit alarm function(optional)
Communication	RS485,support Modbus communication protocol
Power supply	24VDC
Cable length	2.0m
Keypad	Four light touch buttons
Screen	OLED 128*64 displayscreen
Units	Metric and imperial units are available, Cubic Meters(m3), Liters(L), USA Gallons(GAL)/hour,/min,Default unit setting:m3/h
Totalizer	Six bit digit
Piper material	Stainless steel pipe, carbon steel pipe, copper pipe, plastic pipe
Case material	Aluminum alloy
Environment temp.	0℃~50℃（32°F~122°F)
Medium temp.	0℃~50℃（32°F~122°F)
Environment humidit	0-95% relative humidity, without condensation
IP Grade	IP54

Extended Reading: Types Of Crude Oil Flow Meters

More Featured Liquid Flow Meters

Flow Meter Selection Guide 101: Find the Perfect Fit for Your Application

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Frequently
Asked
Questions

Help Center

If you let me answer this question. I would like to divide flow meters into two categories: mass flow meters and volumetric flow meters.

Of course, it can also be divided according to the measurement medium. There are two types of flow meters for measuring gas and measuring liquid.

Perhaps, we can also divide into closed pipeline measurement and open channel measurement according to the situation of the pipeline.

Finally, we may also be able to divide into contact and non-contact measurements according to the contact situation of the medium.

Non-invasive flow meter is also known as non-contact flow meter. When measuring the fluid flow of the pipeline, there is no need to cut and open the pipeline. easy to use.

If the flowmeter is divided into 5 categories. Then the five commonly used flowmeters are:

Electromagnetic flowmeter
Differential pressure flowmeter
Turbine flowmeter
Ultrasonic flowmeter
Volumetric flowmeter (PD)

Extended reading: How to choose a high viscosity flow meter?

Sino-Inst is Manufacturer of Non Contact Flow Meters. We supply more than 20 kinds of Non Contact Flow Meters. 90% ultrasonic flowmeters, and other types of flowmeters.

Non Contact Flow Meters are mainly used for flow measurement of various liquids.
It can measure even liquids such as water, seawater, oil, and slurry.

Non Contact Flow Meters enable stable flow measurement without piping modifications. This greatly meets the measurement needs of many applications. Can be used from small to large tubes. For efficient non-contact flow measurement of flexible and rigid plastic pipes.

Sino-Inst’s Non Contact Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

The entire team at Sino-Inst’s has received excellent training, so we can ensure that every client’s needs are met. For assistance with your product requirements, whether it’s a non-contact flow sensor, level sensor, or other device, give us a call.

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KimGuo11

drurylandetheatre.com

What Is Resistive Pressure Transducer?

Posted on August 4, 2022 by KimGuo11

What Is Resistive Pressure Transducer?

Resistive pressure transducers are also called resistance pressure transducers. It is a commonly used pressure sensor. Pressure sensors are generally distinguished by principle: capacitive pressure transmitters, resistive pressure transducers, inductive pressure transmitters, semiconductor pressure transmitters, and pressure transmitters for high-frequency measurement. Among them, resistance pressure transmitters are commonly used.
Resistance strain pressure sensor is a kind of resistance pressure sensor. It measures the pressure value by the resistance change of the strain gauges bonded to the elastic element.

RFQ Pressure Sensors

Resistive Pressure Transducer Working Principle

The functional principle of a resistive pressure transducer is very simple. A pressure sensor converts a mechanical pressure value into a proportional electrical signal. Pressure sensors usually consist of a body and a (thin) diaphragm.

The electrical components of resistance pressure transmitters that feel pressure are generally resistance strain gauges. Resistance strain gauges are sensitive devices that convert the pressure on the measured component into an electrical signal.

The diaphragm is the most important element for pressure measurement and is equipped with strain-sensitive and piezoresistive structures, so-called strain gauges. The diaphragm deflects under pressure.

The most widely used resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. There are two types of metal resistance strain gauges: filamentary strain gauges and metal foil strain gauges.

Usually, the strain gauge is tightly bonded to the matrix that generates mechanical strain through a special adhesive. When the stress of the matrix changes, the resistance strain gauge also deforms together, which changes the resistance value of the strain gauge. The voltage across the resistor changes.

For example, if a resistor is connected to a Wheatstone measurement bridge, an electrical signal can be measured and transmitted to the indicator.

Extended reading: High accuracy pressure transducers

Types of Pressure Transducers

Let’s talk about the classification of transmitters:

According to the working principle of the sensor, it can be divided into resistance, capacitance, inductance, semiconductor, etc.;
According to the classification of sensor chips, it can be divided into metal, ceramic, diffused silicon, sapphire, etc.;
According to the measurement range, it can be divided into differential pressure, gauge pressure, absolute pressure, high static pressure and differential pressure, etc.;

Resistive pressure transducers are the most widely used transmitters and have the advantages of high cost performance and good linearity characteristics.

Extended Reading: 4 wire pressure sensor wiring diagram

Types of Resistance Pressure Transducers

Resistive pressure transducers are generally divided into metal, ceramic, and diffused silicon according to pressure-sensitive components.

The difference between the three:

The metal pressure transmitter has poor accuracy, but the temperature effect is small, and it is suitable for fields with a wide temperature range and low accuracy requirements.
The accuracy of ceramic pressure sensors is better, but it is greatly affected by temperature. Another advantage of ceramics is impact resistance and corrosion resistance.
Diffusion silicon pressure transmitter has high precision and large temperature drift, so it is generally necessary to perform temperature compensation before it can be used. And even after temperature compensation, pressures above 125°C cannot be measured. However, under normal temperature conditions, the sensitivity coefficient of diffused silicon is 5 times that of ceramics. Therefore, it is generally used in the field of high-precision measurement, but the accuracy is low in the micro-range.

Extended Reading: Smart pressure transmitter

Piezoresistive pressure sensor refers to a sensor made by using the piezoresistive effect of single crystal silicon material and integrated circuit technology.

After the single crystal silicon material is subjected to the force, the resistivity changes, and the electrical signal output proportional to the force change can be obtained through the measurement circuit.

It is also known as a diffused silicon piezoresistive pressure sensor. It is different from the adhesive strain gauge, which needs to indirectly feel the external force through the elastic sensitive element, but directly feels the measured pressure through the silicon diaphragm.

Capacitive pressure transducer (capacitive type pressure transducer) is a pressure sensor that uses capacitive sensing elements to convert the measured pressure into an electrical output that has a certain relationship with it. The characteristics are that the input energy is low, the dynamic response is high, the natural effect is small, and the environmental adaptability is good.

It generally uses a circular metal film or a metal-plated film as an electrode of the capacitor. When the film is deformed by pressure, the capacitance formed between the film and the fixed electrode changes. By measuring the circuit, the output voltage has a certain relationship with the voltage. electric signal.

Capacitive pressure sensors belong to the polar distance variable capacitive sensors, which can be divided into single capacitive pressure sensors and differential capacitive pressure sensors.

Extended Reading: MEMS Pressure Sensors

The differential pressure transmitter is a transmitter that measures the pressure difference between the two ends of the transmitter, and outputs a standard signal (such as 4~20mA, 0~5V).

Differential pressure transmitters are different from general pressure transmitters in that they have 2 pressure interfaces. Differential pressure transmitters are generally divided into positive pressure ends and negative pressure ends.

In general, the pressure at the positive pressure end of the differential pressure transmitter should be greater than the pressure at the negative pressure section to measure.

The differential pressure transmitter is used to prevent the medium in the pipeline from directly entering the transmitter, and the pressure-sensitive diaphragm and the transmitter are connected by a capillary filled with fluid.

It is used to measure the liquid level, flow and pressure of liquid, gas or steam. Then convert it into 4～20mA DC signal output.

Featured DP transmitters.

Potentiometric pressure transducers are usually used for displacement, level and angle measurement.

The measured component is connected to the rotating shaft (or sliding arm) of the potentiometer through a certain mechanical transmission part. When the measured change changes, the sliding arm moves, and the resistance from the center of the potentiometer to the two fixed ends changes differentially.

The resistance change of the potentiometer can be converted into a voltage change output through a voltage divider circuit or a bridge circuit, and after A/D conversion, the measured physical quantity can be accurately measured. !

The hydraulic pressure transducer is mainly used in the pressure measurement of industrial equipment such as construction machinery, special equipment, compressors, injection molding machines, and servo equipment. It has good waterproof, small size and high cost performance. It is easy to install. The whole structure is made of stainless steel, which has good sealing, vibration resistance and stable and reliable performance.

Hydraulic pressure transducer is the extension and development of pressure transmitter technology. According to the principle that the pressure generated by different specific gravity liquids at different heights is linear. Realize the accurate measurement of the volume, liquid height and weight of water, oil and paste. Measure and transmit.

Extended Reading: Liquid pressure sensor

Our pressure transmitters can also be upgraded to Low power-battery powered Wireless Pressure Sensors.

Strain Gauge Pressure Transducer Working Principle

The strain gauge pressure transducer works based on the principle of resistance strain effect.

There are two types of resistance strain gauges: metal strain gauges (wire or metal foil) and semiconductor strain gauges. The measured pressure strains the strain gauge.

When the strain gauge produces compressive strain, its resistance decreases. When the strain gauge produces tensile strain, its resistance increases.

The resistance value of the strain gauge changes, and then the corresponding millivolt-level potential output is obtained through the bridge circuit. The measured pressure is displayed by a millivoltmeter or other recording instruments. Thus, a strain gauge pressure gauge is formed.

Strain gauge structure: It consists of three parts: strain sensitive element, substrate and cover layer, and lead wire. Strain-sensitive elements are generally composed of metal wires and metal foils (high resistivity materials), which convert mechanical strain into changes in resistance. The substrate and cover layer serve to fix and protect sensitive components, transmit strain and electrically insulate.

Resistance strain pressure sensor structure: diaphragm type, cylinder type, combined type. Among them, the diaphragm type is suitable for low pressure measurement; the cylinder type is suitable for high pressure measurement.

The working mode of the resistance strain pressure sensor: the change of resistance is converted into the output of current or voltage signal through the unbalanced bridge.

Featured Air pressure transducer

**SI-300 Pressure Transducer 4-20mA/Voltage**

**SI-390 Industrial Pressure Transmitter**

SI-512H High Temperature Pressure Sensor

Featured Digital pressure transducer

**Diffused silicon Gauge Pressure Transmitter**

**Capacitive Gauge Pressure Transmitter**

**Hygienic / Sanitary Pressure Transmitter**

Frequently
Asked
Questions

Help Center

Classification of working principle of pressure sensor

Piezoresistive pressure sensor
Ceramic pressure sensor
Diffusion silicon pressure sensor:
Sapphire pressure sensor:
Piezoelectric pressure sensor:

Extended reading: Pressure Sensor Applications-Featured Industry Applications

Using a multimeter to test the pressure sensor can only perform simple tests, and the test results are only for reference.
There are roughly three tests that can be performed:

Bridge detection:
It mainly detects whether the circuit of the sensor is correct. Generally, it is a Wheatstone full-bridge circuit, which uses the ohm gear of the multimeter to measure the impedance between the input terminals and the impedance between the output terminals. These two impedances are the input and output of the pressure sensor. impedance. If the impedance is infinite, the bridge is disconnected. It means that there is a problem with the sensor or the definition of the pin is not correctly judged;

Detection of zero point:
Use the voltage range of the multimeter to detect the zero output of the sensor without applying pressure. This output is generally a mV level voltage. If it exceeds the technical specifications of the sensor, it means that the zero point deviation of the sensor is out of range;

Pressure detection:
The method of checking the order is: supply power to the sensor, blow the air guide hole of the pressure sensor with the mouth, and use the voltage range of the multimeter to detect the voltage change at the output end 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 will need to switch to an air pressure source to apply pressure.

These types of sensors are also called pressure transmitters. Because 4-20mA signals are least affected by electrical noise and resistance in the signal line, these sensors are best used when signals must be transmitted over long distances. These sensors are typically used in applications where the lead must be 1000 feet or more.

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

What Is a Fluid Pressure Sensor?

Posted on July 25, 2022 by KimGuo11

What Is a Fluid Pressure Sensor?

Fluid Pressure Sensors refers to sensors that can be used to measure the pressure of liquid media. Such as measuring pressure of Oil, Fuel and other fluid systems (select a sensor with the appropriate range for your system). Fluid Pressure Sensors are also called liquid pressure sensor or liquid pressure transducer. Fluid Pressure Sensors have important uses. For example, the direct measurement of pressure in a fluid line. For example, put Fluid Pressure Sensors into the liquid, measure the liquid pressure, and estimate the liquid level. For example, by measuring the differential pressure of Fluid, the flow rate of the pipeline can be calculated.

RFQ Pressure Sensors

What is a pressure sensor?

Typically, a pressure sensor (sometimes called a pressure transducer or pressure transmitter) is used to measure the pressure of a fluid (gas or liquid).
Pressure is an expression of the force required to stop a fluid from expanding, and is usually expressed in force per unit area.
Pressure sensors generate electrical signals related to the applied pressure. Such signals are usually digital or analog, but optical, visual and auditory signals are also common.
Industrial pressure sensors, also known as pressure transducers, pressure transmitters, pressure indicators and pressure switches.

Extended Reading: Smart pressure transmitter working principle

How do fluid pressure sensors work?

An instrument for measuring fluid pressure. Usually the measured pressure is compared to a reference pressure (such as atmospheric pressure or other given pressure), thus measuring the relative pressure or pressure difference.

According to the working principle, it can be divided into three types: liquid column, elastic and sensor.

The principle of the pressure sensor is to convert the pressure signal into an electrical signal. Such as strain type, elastic element deformation caused by resistance change. Piezoelectric, the use of piezoelectric effect.

Various pressure sensors can be miniaturized, more accurate and fast to measure, especially to measure dynamic pressure, realize multi-point inspection, signal conversion, long-distance transmission, computer connection, timely processing, etc., so as to develop rapidly and widely used.

Extended reading : Types of pressure sensors

Applications of fluid pressure sensors

Fluid pressure sensors are mainly used in: construction machinery, hydraulic and pneumatic systems, petrochemicals, energy and water treatment, water conservancy and hydropower, compressors and other fields:

In the hydraulic system, the pressure sensor is mainly used to complete the closed-loop control of the force. Extended reading: Hydraulic oil flow measurement solutions.

When the control spool moves suddenly, a peak pressure several times the working pressure of the system will be formed in a very short period of time.

In typical mobile and industrial hydraulics, any pressure sensor can quickly be destroyed if not designed with such extreme conditions in mind.

Shock-resistant pressure sensors are required. There are two main ways for pressure sensors to achieve shock resistance, one is a strain gauge chip, and the other is an external coil. Generally, the first method is used in hydraulic systems, mainly because Easy to install.

Another reason is that the pressure sensor is subject to constant pressure pulsations from the hydraulic pump.

Extended reading: extrusion melt pressure transducer

Fluid pressure sensors are often used in safety control systems, such as the safety management system of the air compressor itself.

In the field of security control, the application is generally considered from the performance aspect, as well as the safety and convenience of the actual operation.

The fluid pressure sensor can install some components and signal conditioners and other devices on a very small chip through materials and advanced processing technology. Therefore, its small size is also its advantage. Of course, it can also improve the accuracy of system testing to a certain extent. .

In the safety control system, the pressure brought by the compressor is controlled to a certain extent by installing a pressure sensor in the piping equipment of the air outlet. This is a certain protection measure and a very effective control system.

When the compressor starts normally, if the pressure value does not reach the upper limit, then the controller will open the air inlet and adjust the equipment to reach the maximum power.

Extended Reading: Resistive Pressure Transducer

Fluid pressure sensors play an important role in injection molds.

It is installed in the nozzle of the injection molding machine, the hot runner system, the cold runner system and the cavity of the mold to measure the distance between the nozzle of the injection molding machine and the cavity during the injection molding, filling, pressure holding and cooling of the plastic. plastic pressure.

Extended reading: High Pressure Hydraulic Flow Meter

There are many kinds of pressure sensors, for the special environment of mine pressure monitoring.

Mine pressure sensors mainly include: semiconductor piezoresistive pressure sensors, metal strain gauge pressure sensors, differential transformer pressure sensors, etc.

The above sensors are widely used in the mining industry, and the specific sensor to be used needs to be selected according to the specific mining environment.

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

Pressure sensors are commonly used in air compressors, as well as air conditioning and refrigeration equipment. These sensor products are small in size and easy to install. In addition, the pressure guide port generally adopts a special valve needle design.

Extended reading: Pressure Sensor Applications In Various Industries

Read more about: Calculation Of Pressure Drop

Pressure Sensor For Liquid Level Measurement

In physics, the pressure P of a liquid is determined by the relationship: p=pgh.

For the same kind of liquid, the liquid density p is constant. Therefore, the pressure P of the liquid is linearly proportional to the height h of the liquid surface (the height from the liquid surface).

It is not difficult to find that the pressure of the liquid at different heights of the liquid level is also different.

As shown in the figure above, when the pressure sensor is used to measure the liquid level, the pressure sensor is installed at the bottom of the tank. When the liquid level in the tank changes, the height h from the tank bottom to the liquid level also changes at the same time, and the pressure naturally changes accordingly, thus achieving the purpose of continuous measurement.

One of the advantages of using pressure sensors for liquid level measurement is non-contact. Compared with mechanical and static methods, when measuring, it does not require too many parts to contact the liquid, and the installation is relatively convenient.

In addition, in terms of measurement principle, compared with similar non-contact measurement methods such as laser and ultrasonic, the relationship of pressure sensor measurement principle is simpler and linear, and it is more intuitive in data processing, analysis and processing.

Extended reading: Differential pressure level transmitter working principle

Pressure Sensors For Flow Measurement

The pressure of the fluid is an extremely important parameter in flow measurement. Differential pressure flowmeter uses the pressure difference at both ends of the throttling element to realize flow measurement.

In addition, the working pressure of the flowmeter can be known through pressure measurement, and necessary correction calculations are performed to ensure the accuracy of flow measurement.

Extended reading: flow rate and pressure relationship

Differential pressure flow meter advantages and disadvantages

Upstream and Downstream Flow Straight Pipe Requirements-for Flowmeter Installation

fluid depth pressure sensor

If we make the pressure sensor into a submersible sensor, it can be used to measure the depth of the liquid.

The most common fluid depth pressure sensor is what we often call the submersible hydrostatic pressure sensor. Used to measure the depth or level of liquids such as water, fuel.

Hydrostatic level measurement is often used for tank level measurement. Hydrostatic level measurement is one type of continuous level measurement.

Hydrostatic pressure sensors are used to measure the level or fill height of liquids. Hydrostatic pressure measurement is suitable for liquid level measurement due to the static pressure effect of non-flowing fluids. This physical principle describes the effect of the gravity of a stationary (i.e. non-flowing) liquid on the measurement point. This gravity is often described as “hydrostatic pressure”.

Related pressure transmitter

**SI-350 Sanitary Pressure Transmitter**

**High Frequency Dynamic Pressure Sensor**

Frequently
Asked
Questions

Help Center

Nonlinear error: This is a factor that has little effect on the initial error of the pressure sensor. The reason for the error is the physical nonlinearity of the silicon chip, but for sensors with amplifiers, the nonlinearity of the amplifier should also be included, the linearity error curve can be a concave or convex dynamometer.
Offset error: Since the vertical offset of the pressure sensor remains constant over the entire pressure range, the diffusion variation of the converter and laser trim correction will generate offset errors.
Sensitivity error: The magnitude of the error is proportional to the pressure, if the sensitivity of the device is higher than the typical value, the sensitivity error will be an increasing function of the pressure. If the sensitivity is lower than typical, then the sensitivity error will be a decreasing function of pressure. The cause of this error is a change in the diffusion process.
Hysteresis error: In most cases, the hysteresis error of the pressure sensor can be completely ignored. Because the silicon chip has high mechanical stiffness. Typically, only hysteresis errors need to be considered when pressure changes are large.

Four errors of pressure sensors are inevitable. We can only choose high-precision production equipment. Using high technology to reduce these errors, it is also possible to perform error calibration at the factory and try to reduce errors as much as possible. Therefore, you don’t need to pay too much attention when using it, but try to reduce these errors as much as possible.

Extended Reading: MEMS Pressure Sensors

Please note that Pressure Transmitter Calibration is required after the pressure transmitter has been used for a period of time. In order to ensure the accuracy of the quantity.

A pressure transducer often called a pressure transmitter, is a transducer that converts pressure into an analog electrical signal.

Although there are various types of pressure transducers, one of the most common is the strain-gage base transducer.

Pressure applied to the pressure transducer produces a deflection of the diaphragm, which introduces strain to the gages.

The strain will produce an electrical resistance change proportional to the pressure.

Extended reading: Pressure transmitter working principle

Of course, you can install a pressure gauge.

Pressure transmitters can be categorized into four main types:

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

Extended reading: High accuracy pressure transducers

Flow is an important parameter in industrial production and life. The amount of fluid flowing through a section of a pipe per unit time is called instantaneous flow. Instantaneous flow is divided into volume flow and mass flow. A flow sensor is a sensor that measures the flow of a fluid. Flow sensor is an important instrument in measurement technology, it is widely used in industrial process control, life science and technology, commercial application, military and other fields. In recent years, with the development of science and technology and the development of human needs, flow sensors are also constantly developing.

Extended reading: Digital Flow Meters

In the hydraulic system, the closed-loop control of the force is mainly caused by the pressure sensor.
The working principle of the pressure sensor in the hydraulic system is that the pressure acts directly on the diaphragm of the sensor. Make the diaphragm produce micro-displacement proportional to the medium pressure. Causes the resistance of the sensor to change. And by using an electronic circuit to detect the change, a standard signal corresponding to the pressure is converted and output.

Sino-Inst offers over 50 pressure sensors for fluid measurement. About 50% of these are differential pressure flow meters, 40% is the liquid pressure sensor, and 20% are pressure Level Transmitter.

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

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

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KimGuo11

drurylandetheatre.com

Influence of Dielectric Constant on Liquid Level Measurement | Radar-Guided Wave Radar Level Meter

Posted on July 24, 2022 by KimGuo11

“Low dielectric constant liquid measurement, not suitable for radar level gauge”. Inadvertently, we hear this all the time. In fact, when I first entered the industry, I thought so too. After a long time and understanding more, I realized that this statement is a bit one-sided. Let’s discuss it in detail.

what is dielectric constant?

The dielectric constant is the main parameter reflecting the dielectric properties or polarization properties of the piezoelectric smart material dielectric under the action of an electrostatic field. Usually denoted by ε.
Different applications of piezoelectric elements have different requirements for the dielectric constant of piezoelectric smart materials.
When the shape and size of the piezoelectric smart material are certain. The dielectric constant ε is determined by measuring the intrinsic capacitance CP of the piezoelectric smart material.

RFQ Level Sensors

Commonly used dielectric constant table

gas	temperature(℃)	Relative dielectric constant	liquid	temperature(℃)	Relative dielectric constant
water vapor	140~150	1.00785	solid ammonia	-90	4.01
gaseous bromine	180	1.0128	solid acetic acid	2	4.1
helium	0	1	paraffin	-5	2.0~2.1
hydrogen	0	1.00026	polystyrene	20	24~2.6
oxygen	0	1.00051	wireless porcelain	16	6~6.5
nitrogen	0	1.00058	UHF porcelain		7~8.5
Argon	0	1.00056	barium dioxide		106
gaseous mercury	400	1.00074	rubber		2~3
Air	0	1	hard rubber		4.3
hydrogen sulfide	0	1.004	Paper		2.5
vacuum	20	1	dry sand		2.5
ether	0	4.335	15% water wet sand		约9
liquid carbon dioxide	20	1.585	wood		2~8
methanol	20	33.7	amber		2.8
Ethanol	16.3	25.7	ice		2.8
water vapor	14	81.5	shellac		3~4
liquid ammonia	-270.8	16.2	Celluloid		3.3
liquid helium	-253	1.058	Glass		4~11
liquid hydrogen	-182	1.22	Yellow phosphorus		4.1
liquid oxygen	-185	1.465	sulfur		4.2
liquid nitrogen	0	2.28	carbon (diamond)		5.5`16.5
liquid chlorine	20	1.9	Mica		6~8
kerosene	20	2~4	granite		7~9
turpentine		2.2	marble		8.3
benzene		2.283	salt		6.2
paint		3.5	Beryllium oxide		7.5
glycerin		45.8

Dielectric constants of common liquids

The relative permittivity of common solvents is at room temperature and the test frequency is 1KHz.

H2O (water) 78.5
HCOOH (formic acid) 58.5
HCON (CH3) 2 (N,N-dimethylformamide) 36.7
CH3OH (methanol) 32.7
C2H5OH (ethanol) 24.5
CH3COCH3 (acetone) 20.7
n-C6H13OH (n-hexanol) 13.3
CH3COOH (acetic acid or acetic acid) 6.15
C6H6 (benzene) 2.28
CCl4 (carbon tetrachloride) 2.24
n-C6H14 (n-hexane) 1.88
n-C4H10 (No. 4 solvent) 1.78

Extended reading: Non contact level measurement

Influence of Dielectric Constant on Guided Wave Radar Level Meter

From the point of view of process conditions, the dielectric constant of the medium to be measured plays a very important role in the measurement of guided wave radar as a known condition.

According to the electrical properties of the dielectric constant, it is roughly divided into three categories: non-polar substances (εr<2.8), weakly polar substances (2.8≤εr≤3.6), polar substances (εr>3.6) .

For liquefied petroleum gas, petroleum, gasoline or other hydrocarbons in petrochemical plants, and petrochemical products, 1.4≤εr≤4.0.
Alcohol, organic solvent, oil-water mixture, etc., 4.0≤εr≤10.0.
Conductive liquids, such as water-based solutions, dilute acids and bases, εr>10.0.

The Guided Wave Radar Level Meter can measure gas/liquid, gas/solid, and liquid/liquid two-phase interfaces.

Ideal for measuring liquid/liquid interfaces, such as oil-water interfaces.

Extended reading: Oil-water interface measurement-Magtech magnetic level indicator

The Guided Wave Radar Level Meter emits low-energy pulsed microwaves that are sent down the probe at the speed of light. At the interface between the probe and the medium, a considerable proportion of microwave energy is reflected back to the transmitter through the probe to receive the first echo signal.

A certain percentage of the pulses will continue down the probe, traversing the upper low dielectric constant medium until it is reflected on the lower medium surface and the transmitter receives the second echo.

To measure the boundary, the minimum thickness of the upper medium is 10-20 cm, so that the echoes of the two liquids can be distinguished. The maximum thickness of the upper dielectric depends on its dielectric constant.

The dielectric constant of the liquid in the upper layer is relatively low, and the difference between the dielectric constants of the upper layer and the lower layer liquid is required to be greater than 10, and the upper layer medium εr<3, the lower layer medium εr>20. Only in this way can the obvious reflection effect be obtained. Both level and interface can be measured simultaneously.

The smaller the dielectric constant of the medium, the greater the amplitude of the reflected signal. For the medium with low dielectric constant (1.2≤εr≤2.5), the guided wave radar level gauge can be selected for powdery or volatile medium.

Some substances hinder or absorb electromagnetic waves in the gas phase, and there are substances in the gas phase that weaken electromagnetic waves. For example, dust, powder (graphite, iron alloy, etc.) with high conductivity, or volatile media. For example, the dielectric constant of liquid ammonia is at room temperature 25 ℃. It is 14.9, which is a conductive medium and can be measured effectively.

The advanced Guided Wave Radar Level Meter is especially suitable for measuring a variety of powders. And liquids with inclined liquid levels caused by vortices.

Because the reflected wave does not depend on a “flat” surface to reflect the echo, microwave safe transmission makes the medium surface condition less affected. Disturbed liquid surface or foam formation, as well as different curved surfaces or furnace outlet will not affect the measurement. Therefore the Guided Wave Radar Level Meter also has a good measurement effect in turbulent situations.

From the perspective of measurement range, the medium with higher dielectric constant has better reflection performance and is suitable for longer measurement range. Guided Wave Radar Level Meter adopts two-wire loop power supply, 24V (DC) or 220V (AC) liquid level transmitter, low energy consumption, and meets the control level process requirements.

Extended Reading: Low Cost Float Level Sensor for Tank Liquid Volume Monitoring

Influence of Dielectric Constant on Radar Level Meter

The Radar Level Meter adopts the principle of transmit-reflection-receive. The antenna of the Radar Level Meter emits electromagnetic waves. These electromagnetic waves are reflected by the surface of the measured object and then received by the antenna. The time from emission to reception of electromagnetic waves is proportional to the distance to the liquid surface.

In the measurement of Radar Level Meter, the measured medium needs to provide sufficient radar reflection signal. In general, the higher the dielectric constant, the stronger the reflected signal. The farther away the target is, the greater the intensity of the reflection is required. In order to have sufficient signal back to the radar transmitter.

When the radar wave reaches the liquid level surface and is reflected. The radar wave will be absorbed and attenuated. When the attenuation is too much, the radar level gauge will not receive enough signal, resulting in inaccurate measurement. This is the dielectric constant of the measured medium. Effects of radar level gauge measurements.

From this point of view, the dielectric constant has an effect on the Radar Level Meter measurement. However, this problem has been well resolved.

The Radar Level Meter can also perform interface measurements, especially on oil-water interfaces.

Principle: When measuring the interface, the part of the pulse that is not reflected on the surface of the upper product will continue down to the surface of the lower product, and then be reflected back.

The requirements for the dielectric constant when the Radar Level Meter measures the interface are as follows:

(1) The dielectric constant of the upper product must be known and must not be changed;
(2) The difference between the dielectric constants of the two products must be greater than 6;
(3) Mainly used in the interface between oil-water liquid and water/water-like liquid with lower dielectric constant of the upper layer (<3) and higher dielectric constant of the lower product (>20).

Extended Reading: What is level transmitter working principle?

Frequently
Asked
Questions

Help Center

Water is extremely unique in that it has a high dielectric constant (=80). A high dielectric constant suggests that the solvent (in this case, water) has the ability to screen charges. This means that water molecules will surround both anions and cations in a solution, and ultimately, diminish the attraction of the two charges.

Perhaps a Coaxial Probe Guided Wave Radar Level Transmitter can work for your low dielectric constant.

For example, if you place a cation (such as sodium) in water, the positive charge (+) of sodium is able to interact with anions and other molecules. However, because water has such a high dielectric constant, there is a decreasing effect on the interaction between sodium and its counter-ion. This is primarily because the charges interact with the electric dipole of water more than with each other, decreasing the overall interaction. In comparison to water, the interaction between anions and cations is much greater when placed in solvents with lower dielectric constants

Quote from: Wikibooks Structural Biochemistry/Unique Properties/High Dielectric Constant

The dielectric constant of polar liquid dielectrics decreases with increasing voltage frequency. This is because the carrier mobility is enhanced, making it easier to conduct electricity. such as electrolytic capacitors.

Although radar level meters are affected by the dielectric constant of the medium. Ultrasonic level meters are not affected. More about Ultrasonic Level Sensor Applications.

So far there is no sensor that can measure the volume of liquid. Because there are various shapes of liquid containers, such as cylinders, spheres, rectangles, cylinders and squares with hemispherical ends.

The height of the liquid in these containers can be detected by a variety of sensors. According to the shape of the container, the volume and weight of the liquid in the container can be calculated.

For rectangles, cylinders or squares, the volume and weight of the liquid can be calculated directly by multiplying the floor area of the container by the height of the liquid. And the corresponding relationship is linear. The hemispherical cylinder and sphere at both ends can be calculated by definite integral. The law of curvature change is the volume formula of the function. Calculate the volume and weight of the liquid according to the height of the liquid.

Read more about: Monitoring liquid volume solutions

Radar level instruments measure the distance from the transmitter (located at some high point) to the surface of a process material located farther below in much the same way as ultrasonic transmitters – by measuring the time-of-flight of a traveling wave.

A guided wave radar level transmitter is also called a wave-guided radar level sensor. They can measure both levels and the interface between two media. Through probe rod or cable, complete level contact types continuous level measurement. Such as Coaxial Probe Guided Wave Radar Level Transmitter. This is different from ultrasonic level measurement, which is a non-contact measurement. A guided wave radar level transmitter is often used for tank level measurement. Including liquid and solid. Output 4～20mA/HART, so as to measure and control the level during production.

Extended Reading: Guided-wave radar (GWR) level transmitter working principle

Related Level Sensors

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

**SIRD-903 26 GHz Radar level Sensor -Dust solid level measurement**

**SIRD-906 Radar Sanitary Level Sensor**

**SIRD-806 Radar High Temperature Level Sensor**

**SI-FMF11 FMCW Radar Level Transmitter 120GHz**

**SIRD-701 Guided Wave Radar Level Sensor**

**SIRD-702 GWR Corrosive Liquid Chemical Level Sensor**

**SIRD-703 GWR Bulk Solids & Powder Solid Level Sensor**

**SIRD-704 Coaxial Probe Guided Wave Radar Level Transmitter**

**SIRD-705 GWR Level Sensor for High Temperature & High Pressure**

Liquid Volume Sensor? Monitors Liquid Volume Solutions

Posted on July 12, 2022 by KimGuo11

Ideally, we should be able to use a liquid volume sensor to directly measure the volume of the liquid in the container. Well, but in fact, there is no mature liquid volume sensor product on the market.

Because there are various shapes of liquid containers. Such as cylinders, spheres, rectangles, cylinders and squares with hemispherical ends.

RFQ

Level Sensors

So why are we talking about liquid volume sensor here? Don’t worry, we don’t have a mature liquid volume sensor. However, we have A dozen ways for liquid level measurement, with different level sensors. Combined with Sino-Inst’s volume recorder. It can collect, display and convert the liquid level of various regular and irregular tanks in the industrial field into the corresponding tank volume. It is suitable for monitoring, controlling and collecting various process parameters.

Featured Level Sensors

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

**SI-PCM261 Submersible Pressure Transducer**

Level Measurement Technologies

Principle: The principle of the connector. Developed according to the principle of buoyancy and magnetic coupling.

When the liquid level in the container under test rises and falls. The permanent magnet steel in the float is transmitted to the magnetic flip column indicating panel through magnetic coupling. Flip the red and white columns over 180°.

The column turns from white to red when the liquid level rises.
The column turns from red to white when the liquid level drops.

The junction of red and white on the panel is the actual height of the liquid level in the container, so as to realize the liquid level display.

The structure of the float level meter is mainly designed and produced based on the principles of buoyancy and static magnetic field.

The position of the float with a magnet (abbreviated as float) in the measured medium is affected by buoyancy: changes in the liquid level lead to changes in the position of the magnetic float.

The magnet and sensor (reed switch) in the floating ball act to change the number of components (such as fixed-value resistors) connected in series to the circuit, thereby changing the electrical quantity of the instrument circuit system.

That is, the change of the position of the magnetic float causes the change of the electrical quantity.

The liquid level in the container is reflected by detecting the change of the electrical quantity.

It is designed and manufactured using the principle of mechanical balance.

When the liquid level changes, the original mechanical balance will reach a new balance through the movement of the steel belt under the disturbance of the buoyancy of the float.

The liquid level detection device (float) drives the steel belt to move according to the liquid level. The displacement transmission system drives the transmission pin to rotate through the movement of the steel belt. It then acts on the counter to display the liquid level.

The radar level meter is a measuring instrument based on the principle of time travel. The radar wave runs at the speed of light, and the running time can be converted into a level signal by electronic components.

The probe emits high-frequency pulses and propagates along the cable probe. When the pulses meet the surface of the material, they are reflected back and received by the receiver in the instrument. The distance signal is converted into a level signal.

When the sensor of the magnetostrictive level transmitter works, the circuit part of the sensor will excite a pulse current on the waveguide wire. When the current propagates along the waveguide wire, a pulse current magnetic field will be generated around the waveguide wire.

There is a float outside the sensor rod of the magnetostrictive liquid level gauge. This float can move up and down along the rod with the change of the liquid level.

Inside the float there is a set of permanent magnetic rings.

When the magnetic field of the pulse current meets the magnetic field of the magnetic ring generated by the float, the magnetic field around the float changes so that the waveguide wire made of magnetostrictive material generates a torsional wave pulse at the position of the float. The waveguide wire is returned and detected by the detection mechanism.

By measuring the time difference between the pulse current and the torsional wave, the position of the float, that is, the position of the liquid surface, can be accurately determined.

The radio frequency admittance level meter is composed of a sensor and a control instrument. The sensor can be installed on the roof of the warehouse using rod-type, coaxial or cable-type probes.

The pulse card in the sensor can convert the material level change into a pulse signal and send it to the control instrument. After the control instrument is processed and converted into engineering quantity and displayed, it realizes the continuous measurement of the material level.

The working principle of the tuning fork level controller is to make the tuning fork vibrate at a certain resonance frequency through a pair of piezoelectric crystals installed on the tuning fork base.

When the tuning fork is in contact with the measured medium, the frequency and amplitude of the tuning fork will change. These changes are detected, processed and converted into a switching signal by an intelligent circuit.

The glass plate type liquid level meter is connected to the container through the flange to form a communication device, and the height of the liquid level in the container can be directly read through the glass plate.

The pressure level transmitter adopts the principle of static pressure measurement.

When the liquid level transmitter is put into a certain depth in the measured liquid.

At the same time as the pressure on the liquid surface of the sensor, the pressure of the liquid is introduced into the positive pressure chamber of the sensor through the air-conducting stainless steel. Then the atmospheric pressure Po on the liquid surface is connected to the negative pressure chamber of the sensor to offset the Po on the back of the sensor.

The pressure measured by the sensor is: ρ .g.H , and the liquid level depth can be obtained by measuring the pressure P .

Capacitive level meters measure the level of liquid level by measuring changes in capacitance.

It is a metal rod inserted into the liquid container. The metal rod is used as one pole of the capacitor. The wall of the container is used as the other pole of the capacitor.

The medium between the two electrodes is the liquid and the gas above it.

Because the dielectric constant ε1 of the liquid and the dielectric constant ε2 on the liquid surface are different. For example: ε1>ε2.

Then when the liquid level rises, the total dielectric constant value between the two electrodes of the capacitive liquid level gauge increases accordingly and the capacitance increases.

Conversely, when the liquid level drops, the value of ε decreases, and the capacitance also decreases.

Therefore, the capacitive liquid level meter can measure the level of the liquid level through the change of the capacitance between the two electrodes.

The intelligent electric displacer liquid level meter is a liquid level measuring instrument designed according to Archimedes’ law and the principle of magnetic coupling. The instrument can be used to measure the liquid level, boundary level and density, and is responsible for the output of upper and lower limit alarm signals.

It is designed and manufactured using the principle of mechanical balance.

When the liquid level changes, the original mechanical balance will be disturbed by the buoyancy of the float. The new balance will be achieved by the movement of the steel belt (rope).

The liquid level detection device (float) drives the steel belt (rope) to move according to the liquid level. The displacement transmission system drives the on-site indicating device through the movement of the steel belt (rope), and then displays the liquid level on the display device.

The pontoon is submerged in the liquid in the pontoon chamber and is rigidly connected to the torsion tube system. The force on the torsion tube system is the net weight of the pontoon minus the buoyancy on the pontoon. Under the action of this combined force, the torsion tube is twisted by a certain angle.

Changes in the position, density or boundary level of the liquid in the buoyancy chamber cause the buoyancy force of the buoyancy immersed in the liquid to change, so that the twisting angle of the tube also changes.

This change is transmitted to a sensor rigidly connected to the torsion tube. Change the sensor output voltage. Then it is amplified by electronic components and converted into 4-20mA current output.

Displacer level transmitters use microcontrollers and associated electronics to measure process variables. Provides current output. Drive LCD display and provide HART communication capability.

The magnetic-sensitive electronic two-color liquid level meter is made of high-quality stainless steel and imported electronic components.

The display part adopts high-brightness LED two-color light-emitting tube to form a columnar display screen.

Through the red and green changes of the LED light column, the upper and lower limit alarm and control of the liquid level can be realized.

The external liquid level meter is an instrument that measures the liquid level from the outside of the container using the principle of sonar ranging and “micro-vibration analysis” technology.

Two small external level gauge ultrasonic sensors are installed on the bottom of the tank and the other on the side wall of the tank to compensate for density changes.

The signal of the external level meter sensor is converted by the microprocessor and output to the local display or user control system. Can calculate the height of the liquid in the tank and the volume of the liquid in the tank

The hydrostatic level transmitter encapsulates the diffused silicon oil-filled core in a stainless steel shell.

The front protective cap protects the sensor diaphragm. It can also make the liquid contact the diaphragm smoothly. The water wire is sealed with the housing. The ventilation tube is connected to the outside world in the cable. The internal structure is designed to prevent condensation.

Ultrasonic level Sensor is composed of a complete ultrasonic sensor and control circuit.

The ultrasonic wave emitted by the ultrasonic sensor is reflected by the liquid surface. The time required to return is used for calculation.

The temperature influence in the ultrasonic transmission process is corrected by the temperature sensor, which is converted into the distance between the liquid surface and the ultrasonic sensor.

Output 4mA-20mADC analog signal through LCD screen. Realize remote reading of field instruments.

The differential pressure liquid level transmitter is an electrical component that measures the high and low pressure difference, and then converts it into a current signal by the conversion component and transmits it to the control room.

Differential pressure liquid level transmitter is mainly used for liquid level measurement of closed pressure vessels.

The size of the differential pressure also represents the size of the liquid level height.

Use a differential pressure gauge to measure the differential pressure between the gas and liquid phases to know the liquid level.

Liquid Volume Sensor

The height of the liquid in these containers can be detected by a variety of sensors. According to the shape of the container, the volume and weight of the liquid in the container can be calculated.

Extended Reading: Advantages and disadvantages of laser level transmitter

Monitoring liquid volume solutions

Most of our liquid level sensors can output liquid level signals, such as 4-20mA signal, 0-10V signal, RS485 and so on.

However, the liquid level transmitter alone cannot calculate the liquid volume of tanks of different sizes. It’s too complicated. A separate recorder is required to calculate it.

Therefore, the digital display volume meter can collect, display and convert the liquid level of various regular and irregular tanks in the industrial field into the corresponding tank volume. It is suitable for monitoring, controlling and collecting various process parameters.

So, How to measure volume of liquid?

After the liquid level gauge is installed in your tank, Sino-Inst’s volume display controller/recorder can collect, display and convert the liquid level of various regular and irregular tanks on the industrial site into the volume of the corresponding tank . It is suitable for monitoring, controlling and collecting various process parameters.

The volume meter is equipped with volume download software as standard. Form a liquid level volume comparison table. Import volume meter, suitable for volume conversion of various regular or irregular tanks.

The meter is equipped with RS232 communication interface as standard. Connect with the host computer. Through the volume download software, data writing for regular and irregular tanks can be realized. 1000 sets of data can be downloaded.

Volume Recorder

LCD Volume Display Regulator/ Recorder is specifically designed for industrial on-site regular and irregular canned liquid, volume and mass conversion.

It is based on a 32-bit ARM micro-processor and equipped with the secondary meter with high-speed AD and high-capacity storage unit.

The device has empowered by the surface mounting technology, featuring the design of multiple-layered protection and isolation, with a strong anti-interference capability and high reliability.

It has used the embedded operating system with USB data dump function.

The data storage time could reach up to 720 days.

By using U disk and host computer analysis software, one could call and view the historic curve of process variants and relevant historic data from time to time.

It also could match with various liquid sensors, such as ultrasonic liquid level meter. The device has sound anti-theft and anti-damage and other features.

Measurement Input
Input Signal	Current: 0~20mA, 0~10mA, 4~20mA, 0~10mA rooting, 4~20mA rooting
	Input impedance: ≤ 100Ω
	Maximum input current limit: ≤ 30mA
	Voltage: 0~5V, 1~5V, 0~10V (customized), 0~5V rooting, 1~5V rooting,
	Input impedance: ≥ 500KΩ
Output
Output Signal	Analog output: 4~20mA (load resistance ≤ 480Ω), 0~20mA (load resistance ≤ 480Ω), 0~10mA (load resistance ≤ 960Ω), 1~5V (load resistance ≥ 250KΩ), 0~5V (load resistance ≥250KΩ), 0~10 V (load resistance ≥4KΩ) (customized)
	Alarm output: relay control output – AC220V/2A, DC24V/2A (resistive load)
	Feed output: DC24V±1, load current ≤ 50mA
	Communication output: RS485/RS232 communication interface, configurable baud rate of 1200~9600bps, standard MODBUS RTU communication protocol, RS-485 communication distance of up to 1km, and RS-232 communication distance of up to 15m.
General Parameters
Measuring Accuracy		0.2%FS±1d
Setting Mode		Touch-panel-based key setting; password locking of parameter settings; permanent preservation of settings upon power failure.
Display		Backlit 3.5-inch 128*64 high-resolution dot-matrix FSTN LCD
		Support the display of Chinese characters, figures, curves and bar graphs, as well as screen page turning, historical data search and timescale changes of curves etc. through the panel keys
Recording Interval		1, 2, 4, 6, 15, 30, 60, 120, or 240 seconds, nine options available
Storage Length		3 days (with 1-sec interval) – 720 days (with 240-sec interval)
Printing Control		RS-232C printer interface, supporting SP-A40SH series serial printers
Operating Environment		Ambient temperature: 0~50℃; relative humidity: ≤ 85%RH; avoid strongly corrosive gas
Working Power Supply		AC 100~240V (switching power supply), 50/60HZ; DC 20~29V (switching power supply)
Power		≤5W
Structure		-Standard snap-in type

Frequently
Asked
Questions

Help Center

Different types of liquid level sensors work based on different principles.

For example, a commonly used water level sensor:
Liquid level sensor (hydrostatic level gauge/liquid level transmitter/liquid level sensor/water level sensor) is a pressure sensor that measures liquid level. The hydrostatic submersion type liquid level transmitter (liquid level gauge) is based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid. The isolated diffused silicon sensitive element or ceramic capacitive pressure sensitive sensor is used. Convert static pressure to electrical signal. After temperature compensation and linear correction, it is converted into a standard electrical signal (usually 4~20mA/1~5VDC).

Liquid level sensor (hydrostatic level gauge/liquid level transmitter/liquid level sensor/water level sensor) is a pressure sensor that measures liquid level.

The static pressure input liquid level transmitter (liquid level gauge) is based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid. It adopts an isolated diffusion silicon sensitive element or a ceramic capacitive pressure sensitive sensor. The static pressure is converted into Electrical signal. After temperature compensation and linear correction, it is converted into a standard electrical signal (usually 4~20mA/1~5VDC).

It is suitable for liquid level measurement of various media in petrochemical, metallurgy, electric power, pharmaceutical, water supply and drainage, environmental protection and other systems and industries.

There are two ways to measure the volume of a liquid:

The measuring cylinder can directly measure the liquid volume;
Using the density formula, the volume of a liquid can be obtained as the quotient of the mass and density of the liquid.

Yes.
Ultrasonic sensors are widely used in liquid level detection. That’s the ultrasonic level sensor.

Liquid volume calculation formula: v=m/ρ, where m is mass, v is volume, and ρ is density.

Liquid volume formula: vml×cmol/l=n1.

Liquid is one of the three major forms of matter. It has no definite shape and is often influenced by the container. But its volume is fixed under the environment of constant pressure and temperature.

The distance between the molecules of the liquid is farther, the molecular motion is also more intense, and the attraction between the molecules is small. Increasing the temperature or reducing the pressure can generally vaporize the liquid and turn it into a gas.

LORA Water Meter

Posted on July 11, 2022 by KimGuo11

LORA Water Meter is a commonly used wireless water meter/wireless flowmeter.

The wireless remote water meter measures the water flow in the pipeline. The microcomputer in the water meter automatically stores the amount of water used. When the time to send data regularly or when a meter reading signal is detected, the data is sent out through the wireless frequency band. Such as narrowband Internet of Things NB-IOT technology, LORA technology, GRS technology, etc.

There will be no signal interference, instead of manual meter reading. It is more convenient and faster, and the success rate of meter reading is high.

RFQ

Flow Meters

Featured Water Meters for Sale

**Ultrasonic Water Meter for Residential Water**

**Insertion Ultrasonic Water Flow Meter**

What is LORA Smart Water Meter?

With the development of the Internet of Things technology, the “members” of the water meter family have undergone various changes. The new LORA smart water meter is favored by large water companies with spread spectrum modulation technology.

Presumably everyone is very unfamiliar with the word “LORA” in the Lora smart water meter. “LORA” stands for long-distance low-power data transmission, and it is a patented technology of a company in the United States. It uses chirp spread spectrum modulation technology and requires no wiring. A SIM card is added inside the concentrator host to realize wireless remote data transmission. Its receiving sensitivity has reached an astonishing -148dbm.

Compared with other advanced level chips in the industry. The higher receiving sensitivity improves more than 20db, which ensures the reliability of network connection.

Compared with other ordinary smart water meters, LORA smart water meters have the advantages of strong anti-interference, strong signal reception, low power consumption, and no wiring. Completely beats other ordinary smart water meters. It must be the trend of water meter products in the future.

Extended reading: Ultrasonic Water Meter Working Principle

Wireless Remote LORA Water Meter vs Mechanical Water Meter

With the continuous update of intelligent remote transmission technology, traditional mechanical water meters have been hit unprecedentedly in the industry. Will mechanical water meters be replaced by new smart water meters? Then we have to see which of their respective performance can better meet the market demand.

Let’s take the current popular LORA wireless remote water meter as an example to compare it with ordinary mechanical water meters.

The most prominent drawback of ordinary mechanical water meters is its meter reading method, and the impact of this drawback is becoming increasingly prominent.

In our inherent thinking, it is a very common and normal thing for meter readers to go door-to-door to read meters. However, under the impact of technologies such as the Internet of Things, the efficiency of door-to-door meter reading has been questioned.

The LORA wireless remote water meter developed using new technology is a meter reading command issued by the meter reader through the remote meter reading system. After the LORA module on the wireless remote water meter receives the meter reading command, it will The data is uploaded to the server. The meter reader can read the water meter data. This avoids the high cost and low efficiency of manual meter reading and the nuisance problems caused by household meter reading.

No matter what kind of water meter and what kind of function it has, they are all born to serve people’s lives. Whoever can provide more convenience and higher efficiency will be pushed to the stage of history.

LoRa technology realizes the application of water meter-flow meter wireless transmission

LoRa is one of the LPWAN communication technologies, and it is an ultra-long-distance wireless transmission scheme based on spread spectrum technology adopted and promoted by Semtech in the United States. This solution changes the way of considering the compromise between transmission distance and power consumption in the past. Provide users with a simple system that can achieve long distance, long battery life, and large capacity, thereby expanding sensor networks.

At present, LoRa mainly operates in free frequency bands around the world, including 433, 470, 868, 915MHz, etc.

Extended reading: How to Select the Right Agriculture Flow Meter

LORA wireless RF module

Narrowband spread spectrum wireless communication module based on LORA technology.

Sino-Inst’s modular design idea, the battery and circuit are installed independently. It can be added or repaired later. It does not destroy the reliability of measurement.

One master and one slave connect two modules. There is no wiring trouble on site!

Top 8 Types Petroleum Flow Meters for Oil and Gas Industry

Posted on June 29, 2022 by KimGuo11

In the new era, petrochemical enterprises are facing unprecedented challenges. How to improve the production efficiency of the petroleum industry and improve the product quality is an important problem that needs to be solved urgently in front of us. The rational application of flow meters to the petrochemical industry can effectively reduce production costs. Promote the improvement of work quality and efficiency of petrochemical enterprises. However, due to the difference of fluids and different production conditions, it is necessary to choose the petroleum flow meters that meet the actual situation based on the actual production needs.

RFQ Flow Meters

Top 8 petroleum flow meters for Measuring Oil and Gas

It can mainly use the principle that there is a corresponding relationship between the pressure difference and the flow rate generated when the fluid passes through the throttling device, and use the measurement of the pressure difference to achieve flow measurement.

The differential pressure type structure is relatively simple and has been widely used.

However, with the continuous emergence of various technologies, the problem of insufficient accuracy has gradually appeared in this type of instrument.

The types of differential pressure flowmeters include orifice plate, nozzle, venturi tube, etc.

The ultrasonic flowmeter uses ultrasonic waves to detect the liquid flowing inside, so as to capture the reflected waveform data and calculate the corresponding material flow.

As a non-contact flow meter, the ultrasonic flowmeter is suitable for measuring fluids that are not easy to touch and observe and large-diameter flow.

Extended Reading: Collection of Industrial Insertion Flowmeter Type

Turbine flowmeter is a kind of velocity type flowmeter. Turbine flowmeters are divided into liquid turbine flowmeters and gas turbine flowmeters.

The liquid turbine flowmeter is suitable for the measurement of various clean liquid media, but not for gas measurement.

Gas turbine flowmeter is suitable for the measurement of clean gas medium, not for steam and liquid measurement.

Extended Reading: Industrial petrol flow meters Types

Positive displacement flowmeter is also called fixed displacement flowmeter. Positive displacement flowmeters use mechanical measuring elements to continuously divide the fluid into a single known volume portion, and measure the total flow volume based on the number of times the metering chamber fills and discharges that volume portion of fluid sequentially and repeatedly.

The main varieties of positive displacement flowmeters are oval gear flowmeters, waist wheel flowmeters, membrane gas flowmeters, etc.

Extended Reading: Summary Of Crude Oil Flow Measurement Options

The electromagnetic flowmeter has been well used in the flow measurement of some conductive liquid substances, but it cannot measure the flow of gas, steam and pure water.

In addition to measuring the flow of general conductive liquids, electromagnetic flowmeters can also measure liquid-solid two-phase flow, high-viscosity liquid flow, and volume flow of salt, acid, and alkaline liquids.

However, it is worth noting that it is not suitable for use in environments with high temperatures and strong magnetic fields.

Vortex flowmeter is a volume flowmeter that measures the volume flow of gas, steam or liquid, the volume flow or mass flow of standard conditions, and is researched and produced according to the principle of Karman vortex. Mainly used for flow measurement of industrial pipeline medium fluid, such as gas, liquid, steam and other media.

It is characterized by small pressure loss, large measuring range, high precision, and is almost not affected by parameters such as fluid density, pressure, temperature, viscosity, etc. when measuring the volume flow of the working condition. No moving mechanical parts, so high reliability and low maintenance.

Read more about: Types of biogas flow meters

Thermal flowmeter is a flow meter designed based on the principle of thermal diffusion, that is, it is measured according to the heat exchange relationship between the fluid in flow and the heat source.

Thermal gas mass flow meters are suitable for the measurement of various dry and pure gas media (except acetylene).

Rotameter, also known as rotameter, is mainly used for small and medium caliber flow measurement. Can measure liquid, gas, steam and other media. The product series has complete specifications and is widely used.

According to the material, the rotameter can be divided into glass tube rotameter, plastic tube rotameter, metal tube rotameter, etc.

Extended Reading: Metal Tube Flow Meter Applications

Extended reading: High Pressure Rotameter for Liquids/gas-Upto 25 Mpa

Featured Petroleum Flow Meters

**Low temperature Turbine Flowmeter-Liquid Nitrogen Flow Meter**

Factors affecting the accuracy of petroleum flow meters

(1) Instrument accuracy

During the production of the flow meter, due to rough parts, assembly accuracy and wear, etc., the accuracy of the flow meter itself is not high or the accuracy is reduced, so that the quantity of petroleum products sent (paid) is inaccurate. Therefore, when selecting a flowmeter, one with higher accuracy should be selected. At present, the accuracy of the working flowmeter is required to be ±0.5% in China, and the periodic verification should be carried out according to the regulations in use.

(2) Installation process

Although the accuracy of the flowmeter is high, due to improper or unreasonable installation process, the flowmeter will produce systematic errors. If there is not enough straight pipe section in front of the flowmeter (generally the straight pipe section should not be less than five times the diameter of the oil pipeline used), eddy current will occur, and the elbow in the pipeline will increase the flow resistance for a long time, which cannot guarantee the working pressure of the flowmeter. It can cause errors in the indication value of the flowmeter.

Extended reading: Crude oil measurement, 80G radar level meter should be your first choice!

(3) Medium

The medium used for the factory calibration indication value of the flowmeter is different from the medium at work, and the indication value reflected by the flowmeter is also different. For example, water is used as the medium during calibration, but it is used in various petroleum product media during work, so there will be errors, mainly due to the different viscosity of the medium. Therefore, it is required that the medium used for calibrating the indication value of the flowmeter should be consistent with the working medium, so as to eliminate the error caused by this.

(4) Temperature

The flowmeter cannot display the true value of the output (payment) amount due to accidental errors caused by temperature instability during the work start to end. Therefore, it is required that the flowmeter should keep the temperature as consistent as possible during the oil delivery process.

(5) Differential pressure and flow rate

The use of the flowmeter should be within the specified pressure differential range to ensure accuracy. Because the pressure is high and the flow rate is fast, the flow rate is also large, and vice versa. If the flowmeter cannot maintain the consistency of the pressure difference between the front and rear during the oil delivery process, and it is higher or lower than the working pressure difference range of the instrument, it will affect the accuracy of its output (payment) volume.

Extended Reading: Mechanical oil flow meter

(6) The working environment is different from the verification environment

During the periodic verification of the flowmeter, if it is carried out in a specific device of the metrological verification unit, when it cannot be consistent with the verification conditions in use, environmental errors will also occur. Therefore, when periodic verification is required, it is required to be carried out under working conditions, that is, on-site calibration.

Extended reading: Heating Oil Flowmeters

Flowmeter selection principle

The rational design and selection of flow meter should be a scheme with high reliability, convenient maintenance and cost saving under the premise of meeting the requirements of use.

The factors that need to be considered in the selection of flow meters mainly include: fluid characteristics, flowmeter characteristics requirements, installation conditions, environmental conditions and costs.

In addition, the selection of flow meters cannot fully pursue high performance and high precision, which not only increases the procurement cost, but also increases the cost of spare parts.

Accurate measurement and regulation of fluid flow is the basis for ensuring the safety of petrochemical production processes, improving product quality and reducing energy consumption.

Due to the complexity and diversity of the medium for flow measurement, there is no universal flowmeter, and no flowmeter can be applied to various media under any different conditions.

Each flowmeter has its advantages and limitations in measurement, and flowmeters with different principles, structures and functions play a role in their respective applicable ranges.

Therefore, the selection of flowmeters needs to follow standard specifications and selection principles, and comprehensively consider various factors that affect flow measurement.

Read More about: Choose the most suitable Inline flow meter

Read more about: Coriolis meter for High viscosity liquid

Related Flow Meters for Measuring Oil and Gas

**LCD display Oval Gear High Viscosity Flow Meter**

**High Temperature Oval Gear Flow Meter – Heating oil**

What is a fuel flow meter? The fuel flow meter is an instrument that can monitor fuel flow. Industrial Fuel is an important energy source. For example, diesel, marine fuel, gasoline, etc.

Industrail Fuel is an important energy source for production and manufacturing. For example, diesel, marine fuel, gasoline, etc. It is very necessary to accurately measure industrial fuel. Commonly used industrial fuel flow meters, such as turbine flow meters, gear flow meters, mass flow meters, ultrasonic flow meters, etc.

Application of flow meter in petrochemical industry

3.1 Application in Onshore Oilfield

Constrained by various factors, the drilling of deep wells and ultra-deep wells in Youshan generally has the problem of wasting high-density weighted materials.

In order to maximize the use of weighted materials, it is necessary to combine the relevant parameters of the centrifuge, the change of density difference, the viscosity of drilling fluid and other data. With the support of the calculation flow meter sensor, accurate data information can be obtained. Working speed and processing capacity. And scientifically control it with the help of computer to achieve the purpose of recycling.

In the use of flow meters in the petroleum industry, the selection of flow meters is very important. Therefore, we must fully consider the characteristics and working principles of flow meters and choose suitable flow meters.

3.2 Application on Offshore Drilling Platforms

At present, the development of offshore oil resources is in the ascendant, and a large number of offshore drilling platforms have been put into operation. They are mainly composed of modules such as public system, process production system and auxiliary process system.

According to the functional requirements of each plate, it is determined that it needs to rely on a large number of flow meters in its role.

For example:

The main measurement uses condensate oil as the fluid medium, its parameters are viscosity 0.89cp, temperature range 42～65℃, working pressure 6690～7411KPa, conventional flow 0.521m/h.

Combine the above basic data to filter the flow meter.
First, since the petroleum medium is not conductive, electromagnetic flowmeters can be excluded;
Second, condensate is highly dependent on pipelines, which are then delivered directly to end equipment. This can exclude turbine, ultrasonic and mass flow meters;
Finally, due to the limited space of the offshore drilling platform, the differential pressure flowmeter is also difficult to apply.

In order to prevent high cost, it is also necessary to exclude flow meters and positive displacement. In order to meet the requirements of small pipe diameter and low flow rate, it is also necessary to choose a rotameter.

Extended reading: metal tube flow meter

Frequently asked questions

Contact Us

Measuring oil flow is to measure the volume or mass flow of oil. According to the actual demand, and the actual parameters of the oil, the appropriate oil flow meter can be selected.

Extended reading: What Is Hydraulic Flow Meter?

Turbine flowmeter can be used to measure the flow of gasoline, with high measurement accuracy, liquid crystal display instantaneous flow, cumulative flow, stainless steel material, flange installation!

Of course, other types of flow meters can also be selected.

Industrial oil flow meters measure the volume or mass of oil. Can realize the mutual conversion of volume and mass.

The main industrial oils are hydraulic oil. Gear Oil. Turbine oil. Compressor oil. Refrigeration oil. Transformer oil. Cylinder oil, heat treatment oil, heat transfer oil, etc. Of course, edible oil can also be produced in the industry. In addition, there are greases with lubricating oil as base oil and thickening agent.

Therefore, whether it is a company that uses, trades, or produces oil, it needs to accurately measure the oil flow.

There are many common oil flow meters, such as turbine flow meters, positive displacement flow meters, gear flow meters, mass flow meters, etc.

Extended Reading: Rotameter vs Flow meter

If you want to divide the flow meter into three categories. I think it can be divided into volumetric flowmeters, mass flowmeters, and velocity flowmeters.

Sino-Inst’s petroleum flow meter offer reliable and accurate volume flow measurement in a large range of sizes and pressure rating while being fully compliant with international standards.

Sino-Inst is the risk-free choice for your petroleum flow measurement applications.

Sino-Inst supplies petroleum flow meters, like: gas turbine flow meter. vortex flowmeter, thermal mass flow meter, and more.

Sino-Inst’spetroleum flow meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.

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KimGuo11

drurylandetheatre.com

Mechanical Oil Flow Meters

Posted on June 21, 2022 by KimGuo11

What is mechanical oil flow meter?

RFQ Flow Meters

Featured Mechanical Oil Flow Meters

**Thermal insulation Oval Gear flow meter**

**Clamp Filling Oval Gear Positive Displacement Flow Meter**

**Rotameter flow meter-Variable Area Flow Meters**

oil flow meter types

At present, the following types of flow meters can be used to measure oil: Turbine flow meters. Gear flow meter. Vortex flowmeter. Ultrasonic flow meter. Mass flowmeter. Differential pressure flow meters.

You can find a suitable flow meter in the appropriate type of oil flow meter according to your needs. Of course, maybe, you don’t know what type of flowmeter you should use.

Next, we recommend suitable flow meters for some commonly used oils.

The fuel flow meter is an instrument that can monitor fuel flow. Industrial Fuel is an important energy source. For example, diesel, marine fuel, gasoline, etc.

Industrial Fuel is an important energy source for production and manufacturing. For example, diesel, marine fuel, gasoline, etc. It is very necessary to accurately measure industrial fuel. Commonly used industrial fuel flow meters, such as turbine flow meters, gear flow meters, mass flow meters, ultrasonic flow meters, etc.

If your fuel has low viscosity and good flow rate. You can first refer to the turbine flowmeter. As long as the pressure and flow range are satisfied, you can find a suitable flow meter and use the best price.

Extended reading: Flow Totalizer F3000X for Data collection and calculation

Turbine Sanitary flow meter

If you need to measure the flow of cooking oil. Such as sunflower oil. Then, the sanitary flowmeter is the first choice.

Sanitary turbine flow meters have stainless steel bodies and come standard with Tri-Clover fittings. A Sanitary flow meter is suitable for measuring liquid without impurities. It can output a pulse frequency signal. It is used to detect instantaneous flow and total integrated flow. A Sanitary flow meters can be used in food, sports drink, liquor, and other beverage industries, in preprocess applications.

The heat transfer oil uses a high-temperature vortex flowmeter to measure the flow rate. Can meet the measurement of high temperature. the best price.

Extended Reading: Summary Of Crude Oil Flow Measurement Options

For measuring lubricating oil, the mechanical oval gear flowmeter is the first choice. Because of measuring temperature, high viscosity measurement can be met. Oil with low viscosity can be measured with a turbine flowmeter.

Extended reading: mechanical oil flow meter

To measure crude oil, you can also consider the oval gear flowmeter first. If the precision is extremely high. Then you can use a mass flow meter.

Extended reading: Oil Level Measurement Solutions for the Oil & Gas Industry

There is no hydraulic oil flow meter in the strict sense. It is not accurate to say which flowmeter is a hydraulic flow meter. Which one to use depends on the specific flow measurement conditions.

For example, the hydraulic oil is also labeled, 40 #, 46 #, or other viscosity properties. Then choose a suitable flow meter according to the relevant information such as flow, pressure, viscosity, and so on.

Of course, turbine flowmeters can be considered first.

Extended Reading: Guide and Selection for Diesel Fuel Flow Meters

The heating oil flow meter is also called a heating oil flow gauge. It is a high-temperature mechanical fuel meter. A high-temperature type oval gear flow meter can be used as a heating oil flow meter. Can reach 60℃~200℃.

mechanical flow meter types

There are many types of flow meters.

The electromagnetic flowmeter is based on the electromagnetic principle. When a conductive fluid flows through an electromagnetic field, the velocity of the fluid can be obtained by measuring the voltage.

Ultrasonic flow meters use the principle of ultrasonic acoustics to measure flow velocity. The mechanical flow meter is a relative concept.

Compared with other flow meters, the mechanical flowmeter relies on the rotation and displacement of mechanical parts to measure the flow rate. Common mechanical flow meters have the following categories.

Tool: Volumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

A positive displacement flowmeter as a mechanical flow meter is a common type of Volumetric Flow Meter. It can measure the volume flow of high viscosity and corrosive fluids.

Volumetric flow meter working principle
The positive displacement flow meter is a flow meter that uses mechanical measuring elements to continuously divide the fluid into a single known volume, and repeatedly fill and discharge the volume of fluid to accumulate the total amount of fluid.

Read more about: positive displacement flowmeter

A Rotameter flow meter is a variable area flow meter based on float position measurement. It is suitable for liquid and gas volumetric flow measurement and control.

Rotameter flow meter working principle
When the measured fluid passes through the annulus formed by the cone and floats from the bottom to the top. The differential pressure produced at the upper and lower ends of the float forms the force for the float to rise. Until the rising force equals the weight of the float immersed in the fluid, the float will stabilize at a certain height.
The height of the float in the tapered tube and the flow rate through it correspond to each other.

Extended reading: Beginner’s Guide: Variable area flow meter

Turbine flow meters are velocity flow meters, also called impeller flow meters. Can be used to measure the instantaneous flow and cumulative flow of liquids and gases.

Turbine Flow Meter Working Principle
The fluid flows through the sensor housing. Because the blades of the impeller have a certain angle with the flow direction. The impulse of the fluid makes the blades have a rotational torque. After the friction torque and fluid resistance are overcome, the blades rotate. The speed is stable after the torque is balanced.
Under certain conditions, the speed is proportional to the flow rate.

Read more about Turbine Flow Meter Working Principle

Gear flow meter is a micro digital positive displacement flow meter. Can measure very small flow rates and quantify small volumes of liquid. High and low temperature resistance (-196℃-200℃).

Gear flow meter working principle
With the flow of the medium, the gears mesh and rotate. Under the action of the fluid flow, a pressure difference is formed at both ends of the instrument inlet and outlet. There is no need for power supply. A pair of gears rotate freely. The cavity between the gears is filled with liquid. Discharge and measure the number of revolutions of the gear to know the flow of liquid and liquid flowing through the instrument.

Read more about Gear flow meter for Microflow

Frequently asked questions

Mechanical flow meters are a type of flow meters that use arrangement moving parts to measure flow. The fluid passes through a series of gears or chambers (positive displacement or PD) or through a rotating turbine or rotor. Mechanical flowmeter is different from electromagnetic and ultrasonic in principle. Mechanical flow meters easily monitor liquid flow rates for water, fuels, viscous fluids and more.

More about Different Types of Flowmeters – Technical and Application Analysis.

Industrial oil flow meters measure the volume or mass of oil. Can realize the mutual conversion of volume and mass.

Therefore, whether it is a company that uses, trades, or produces oil, it needs to accurately measure the oil flow.

There are many common oil flow meters, such as turbine flow meters, positive displacement flow meters, gear flow meters, mass flow meters, etc.

Extended reading: More Inline Digital Diesel Fuel Flow Meters

If you want to divide the flow meter into three categories. I think it can be divided into volumetric flowmeters, mass flowmeters, and velocity flowmeters.

Extended reading: Ultrasonic Water Meter for Residential Water

Oil is generally transported through pipelines. There are many ways to measure oil flow. For example, use the oil tank level difference to calculate the oil flow. Of course, the simplest and most effective way is to use a flow meter.

Although the types of oil flow meters are different, their working principles are different. However, they can all help us achieve a goal. That is to measure and monitor the flow of oil. Instantaneous flow, cumulative flow, etc.

So that we can better control production and trade.

Read more about: Industrial Oil Flow Meters

Flow Meter Selection Guide 101: Find the Perfect Fit for Your Application

mechanical flow meter for diesel

There are three types of flowmeters commonly used to measure diesel.

The first is the oval gear flowmeter, which is also commonly used with an accuracy of 0.5.
The second is the liquid turbine flowmeter, the accuracy can be 0.5, flange or threaded connection
The third type is float type, installed vertically or horizontally, with an accuracy of 1.5.

Read more about: Featured Inline Diesel Fuel Flow Meters

More Featured Oil Flow Meters

**Z-Series Straight Tube Micro Motion Coriolis Flow Meter**

**T-series Triangle Coriolis Mass Flowmeter**

mechanical water flow meter

Mechanical water flow meters refer to a type of flow meter suitable for clean water processes or applications. The working principle of a mechanical water flow meter is to measure the speed of water flowing through a pipe. This causes the piston or turbine to rotate. The volume flow of water is proportional to the rotation speed of the blades. Compared with electronic water flow meters, mechanical water flow meters may become clogged when the water is dirty or contains large particles. When the water flow is low, the mechanical water meter does not work well.

Water Flow Meters

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Sino-Inst offers Mechanical Oil Flow Meters with best price. Please contact our sale engineer for quotation.

Sino-Inst offers over 50 Mechanical Oil Flow Meters for flow measurement. About 50% of these are differential pressure flow meters, 40% is the turbine flow sensor, and 20% are dp flow meters and gear flow meters.

A wide variety of Mechanical Oil Flow Meters options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of flow measurement instrumentation, located in China.

Request a Quote

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KimGuo11

drurylandetheatre.com

What Is a Smart Pressure Transmitter?

Posted on June 20, 2022 by KimGuo11

What Is a Smart Pressure Transmitter?

Smart pressure transmitter is also called Smart pressure sensor or Smart pressure transducer. Smart pressure transmitter is the best pressure measuring instrument. It is also used to measure flow, liquid level, etc.

Smart pressure transmitter (Intelligent Transmitter) is composed of sensor and microprocessor (microcomputer). It makes full use of the computing and storage capabilities of the microprocessor. The sensor data can be processed. Including conditioning of measurement signals. Data display, automatic correction and automatic compensation, etc.

RFQ Pressure Sensors

List of Featured Smart Pressure Transmitters

**Remote Diaphragm Seal Pressure Transmitter**

**Smart Differential Pressure Transmitter**

**SI-1110 Wireless Pressure Transducer**

Advantages of Smart Pressure Transmitters

Smart Pressure Transmitters with reverse polarity and current limiting protection;
Laser trimming temperature compensation, wide range, anti-corrosion, suitable for a variety of media;
Strong overload and anti-interference ability, stable performance;
Unique display header design, optional analog and digital display headers;
The zero point and full scale can be adjusted through the hand-held communicator, and the range shift range is wide.

Extended reading: High accuracy pressure transducers

Zero and span adjustment

The zero point and span adjustment of the transmitter can be adjusted on-site through the buttons of the transmitter itself. It can also be adjusted remotely through a handheld terminal.

The specific method is: add zero pressure and stabilize. Press and hold the Z and S keys at the same time (Z is for zero adjustment, S is for range adjustment) and release for 5 seconds. Press the Z key for 2 seconds to adjust the zero point. After the full pressure is added and stabilized. Press the S key for 2 seconds to adjust the full range.

Note: The adjustment range of zero point calibration is ±8% of the pressure range. The span calibration range is 30% to 100% of the pressure span. Continuously adjustable. After adjustment, close the sealing cap and tighten.

Learn more about: How To Calibrate A 4-20mA Pressure Transmitter

Smart Pressure Transmitters Features

With automatic compensation capability. The nonlinearity, temperature drift, time drift, etc. of the sensor can be automatically compensated by software. It can self-diagnose, and the sensor can be self-tested after power-on. to check whether all parts of the sensor are normal. and make judgments. Data processing is convenient and accurate, and data can be automatically processed according to internal procedures. Such as statistical processing, removal of abnormal values, etc.

With two-way communication function. The microprocessor can not only receive and process sensor data. Information can also be fed back to sensors. The measurement process is thus regulated and controlled. Information storage and memory can be carried out. It can store the characteristic data, configuration information and compensation characteristics of the sensor.

With digital interface output function. The output digital signal can be easily connected with computer or field bus.

Extended reading: extrusion melt pressure transducer

Analog Pressure Transmitter VS Smart Pressure Transmitter

Analog Features

High precision
Span and zero point are continuously adjustable externally
good stability
Positive migration up to 500%, negative migration up to 600%
two-wire system
Adjustable damping, overvoltage resistance
Solid State Sensor Design
No mechanical moving parts, less maintenance
Light weight (2.5kg)
The whole series has a unified structure and strong interchangeability
Miniaturization (166mm total height)
Diaphragm material in contact with the medium is optional
Unilateral overpressure resistance
Low pressure cast aluminum alloy housing

Smart Features

Superior measurement performance for pressure, differential pressure, level, flow measurement
Digital accuracy: + (-) 0.05%
Simulation accuracy: +(-)0.75%+(-)0.1%F.S
Full performance: +(-)0.25F.S
Stability: 0.25% for 60 months
Turndown ratio: 100:1
Measurement rate: 0.2S
Miniaturized (2.4kg) all stainless steel flange for easy installation
Process connections are compatible with other products for optimal measurement
The world’s only sensor with H alloy sheath (patented technology), achieving excellent cold and thermal stability
Smart transmitter using 16-bit computer
Standard 4-20mA, with digital signal based on HART protocol, remote control
Support for upgrades to fieldbus and field control-based technologies.

Our pressure transmitters can also be upgraded to Low power-battery powered Wireless Pressure Sensors.

Smart Pressure Transmitters Working Principle

Smart Pressure Transmitters/intelligent pressure transmitters are composed of pressure sensors and microprocessors.

It makes full use of the computing and storage capabilities of the microprocessor. It can process the data of the sensor, including the conditioning of the measurement signal (such as filtering, amplification, A/D conversion, etc.), data display, automatic correction and automatic compensation.

Microprocessor is the core of intelligent transmitter. It can not only calculate, store and process the measurement data, but also adjust the sensor through the feedback loop to make the collected data optimal.

Since the microprocessor has various software and hardware functions, it can complete tasks that are difficult for traditional transmitters.

Extended reading: Flat Pressure Sensor for High Viscosity Fluids

Smart Pressure Transmitter Communication Protocol

The intelligent pressure transmitter has three forms: voltage output (usually 0-5V), current output (4-20mA), and digital output. The reliability and stability of smart transmitters are very high, but they often encounter communication problems.

Since there was no unified communication protocol standard in the world when the smart transmitter was born, the communication protocols used by transmitters produced by various manufacturers are not the same.

A typical ST3000 such as Honeywell uses the DE protocol. Fisher-Rosement’s 3051 uses the HART protocol. There are also all-digital smart transmitters that follow the fieldbus communication standard.

HART protocol

The intelligent pressure transmitter HART (Highway Addressable Remote Transducer) is a frequency shift keying (FSK) technology based on the Bell 202 communication standard. Digital communication is realized by superimposing the frequency signal on the 4-20mA current.

2 different frequencies: 1200 Hz and 2200H: representing “0” and “1”, superimposed on the 4-20mA DC signal in the form of a sine wave. Because the average value of these sine waves is zero. Therefore, no DC component is generated. It will not affect the 4~20mA process signal. It completes true synchronous communication without interrupting the transmission signal.

DE agreement

The DE protocol of the intelligent pressure transmitter represents “1” and “0” by the amount of pulse current. Digital and analog signals are transmitted separately. When transmitting digital signals, analog signals must be interrupted.

HART communication frequency is high (about 1 ~ 2 kHz). The time constant of the network is required to be no greater than 0.65μs. In this way, the maximum capacitance of HART communication equipment and network limits the maximum distance of communication, which is generally not more than 400m.

Fieldbus Communication Protocol

Fieldbus is defined by IEC (International Electrotechnical Commission) as “a digital, serial, multi-point communication data bus between field devices installed in manufacturing and process areas and automatic control devices in the control room. bus.”

It is a fully digital, bidirectional, serial, multi-station communication network, and a pair of wires can transmit a variety of information.

smart pressure transmitter selection

The main basis for the selection of pressure/intelligent pressure transmitters:

The property index of the measured medium shall prevail, and the reference shall be to save money and facilitate installation and maintenance.

If the measured medium is high viscosity, easy to crystallize and strong corrosion, the isolation type transmitter must be selected. When choosing, consider the corrosion of its medium to the metal of the diaphragm. Be sure to choose the material of the diaphragm. Otherwise, the outer diaphragm will be corroded in a short time after use. The flange will also be corroded, causing equipment and personal accidents. So the choice of material is very important.

The membrane box materials of the transmitter include ordinary stainless steel, 304 stainless steel, 316L stainless steel, and tantalum membrane box materials. When selecting, the temperature of the measured medium should be considered. If the temperature is high, it is generally

Frequently Asked Questions

Pressure transmitters can be categorized into four main types:

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

The smart pressure sensor is the most widely used sensor, which generally consists of elastic sensing elements and displacement sensing elements.

The function of the elastic sensing element is to make the measured pressure act on a certain area and convert it into displacement or strain. It is then converted into an electrical signal with a certain relationship to the pressure by the displacement sensitive element or strain gauge. Sometimes the functions of these two elements are combined.

More about: MEMS Pressure Sensors

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.

Generally speaking, regardless of the type, smart sensors include the following basic features:

self-compensation ability
Self-calibration function
Self-diagnostic function
Numerical processing function
Two-way communication function
Information storage and memory functions

With the development of science and technology, the functions of smart sensors will be gradually enhanced. It will use artificial neural network, artificial intelligence, information processing technology (such as sensor information fusion technology, fuzzy theory, etc.). Empower sensors with more advanced intelligence. It has the functions of analysis, judgment, self-adaptation and self-learning. It can complete complex tasks such as image recognition, feature detection, and multi-dimensional detection.

How the pressure sensor works:

Piezoresistive force sensor:
Resistive strain gauges are one of the main components of piezoresistive strain sensors. The working principle of the metal resistance strain gauge is the phenomenon that the resistance value changes with the mechanical deformation of the strain resistance adsorbed on the base material. Commonly known as the resistance strain effect.
Ceramic pressure sensor:
Ceramic pressure sensors are based on the piezoresistive effect. Pressure acts directly on the front surface of the ceramic diaphragm. The diaphragm is slightly deformed. Thick film resistors are printed on the back of the ceramic diaphragm. connected as a Wheatstone bridge. due to the piezoresistive effect of the varistor. The bridge produces a highly linear voltage signal proportional to the pressure and also proportional to the excitation voltage. The standard signal is calibrated to 2.0/3.0/3.3mV/V according to different pressure ranges, which can be compatible with strain gauge sensors.
Diffusion silicon pressure sensor:
The working principle of the diffused silicon pressure sensor is also based on the piezoresistive effect. Use the principle of piezoresistive effect. The pressure of the measured medium acts directly on the diaphragm of the sensor (stainless steel or ceramic). Make the diaphragm produce a micro-displacement proportional to the medium pressure. The resistance value of the sensor is changed, and the change is detected by the electronic circuit. And convert and output a standard measurement signal corresponding to this pressure.
Sapphire pressure sensor:
Using the working principle of strain resistance, using silicon-sapphire as the semiconductor sensitive element, it has unparalleled metrology characteristics.
Therefore, semiconductor sensitive elements made of silicon-sapphire are used. It is not sensitive to temperature changes, and has good working characteristics even under high temperature conditions; sapphire has extremely strong radiation resistance. In addition, the silicon-sapphire semiconductor sensitive element has no p-n drift.
Piezoelectric pressure sensor:
The piezoelectric effect is the main working principle of piezoelectric sensors. Piezoelectric sensors cannot be used for static measurements. Because of the charge after external force. Saved only if the loop has infinite input impedance. This is not the case in reality, so this determines that the piezoelectric sensor can only measure dynamic stress.

There are many types of sensors that detect pressure.

The most commonly used is the silicon piezoresistive pressure sensor, which has the advantages of high sensitivity, large range, many varieties and reasonable price.

Others include ceramic capacitive pressure sensors, quartz pressure sensors, vibrating wire pressure sensors…etc.

Extended reading: Pressure Sensor Applications-Featured Industry Applications

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