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

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

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.

Read more about: Beginner’s guide to HART Communicators-HART Protocol

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

Related Blogs

Sino-Inst offers over 20 Smart Pressure Transmitters.
A wide variety of industrial Smart Pressure Transmitters options are available to you. Such as free samples, paid samples.
Sino-Inst is a globally recognized manufacturer of industrial Smart Pressure Transmitters, located in China.
Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide.
Industrial Smart Pressure Transmitters products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

Request a Quote

KimGuo11

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

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

drurylandetheatre.com

High Temperature Pressure Transducer is also called High Temperature Pressure Sensor, or High Temperature Pressure Transmitter.

The High Temperature Pressure Transducer is used for applications where the medium temperature exceeds the temperature limits of standard pressure transmitters.

By assembling Cooling Elements of different lengths, the temperature of the measured medium can be further improved. Reasonable and scientific configuration, advanced circuit design and temperature compensation processing fully ensure that the transmitter can work stably for a long time in a high temperature environment.

Examples include high temperature pressure monitoring for steam, food processing and engine monitoring.

RFQ Pressure Sensors

Featured High Temperature Pressure Transducers for Sale

High Temperature Pressure Transducer Specifications

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

Ultra High Temperature Pressure Sensor

The ultra-high temperature pressure transmitter adopts special imported materials, isolated diaphragm design, and water circulation cooling method. The temperature of the measuring medium can reach 1300 ℃.

It is suitable for pressure measurement and control of high temperature media such as engine gas and kiln.

Such sensors are also commonly referred to as:
Ultra-high temperature pressure transmitter, ultra-high temperature pressure sensor, fuel pressure sensor, furnace pressure sensor, water-cooled pressure sensor, water-cooled pressure transmitter.

Extended reading: Heating Oil Flowmeters

Technical Difficulties in Pressure Measurement at High Temperature

High temperature conditions have certain requirements on the material, process and performance of the pressure transmitter. In order to ensure the measurement of High Temperature Pressure Transducer, we need to pay attention to the following points.

1. Fully welded pressure transmitter.
   All connections between capillaries, transmitters and process connections are of fully welded hermetic construction. to eliminate possible leak points.
2. According to different applications, the amount of filling oil can be precisely controlled.
   According to the user’s application and the characteristics of different filling oils. After careful calculation. Appropriately reduce the amount of filling oil. To compensate for the expansion effect of the filling oil.
   For low temperature applications, the amount of filler oil can be appropriately increased according to the specific application. to compensate for the effect of volume shrinkage of the filler oil.
3. Special oil replenishment and oil discharge treatment.
   The main purpose of oil pretreatment for filler oil is to reduce dissolved gas content.
   And in the process of oil filling, vacuum oil filling is used. And strictly control the oil filling amount when the oil reaches the vacuum degree requirement. Guarantee the measurement accuracy of the final product.
4. In modern technological processes, high temperature pressure transmitters often adopt symmetrical designs. Same diaphragm, same capillary length and same oil-filled fluid on both high and low pressure ends.
   It is generally believed that when the effect of temperature change acts on the high and low pressure sides of the transmitter. This effect will be eliminated. The effect of temperature on the diaphragm is generally considered to be the most important cause of temperature drift. In fact, the opposite is true.
   • Using the same length of capillaries on the high and low pressure sides did not improve performance. Instead, it increases the impact of temperature changes on the overall performance of the transmitter.
   • Pressure transmitters are temperature dependent not only by the amount of temperature change of the diaphragm of the base product. The length of the capillary is also an important factor affecting the temperature change of the transmitter. And the hardness is proportional to the length of the capillary.
   • The high and low pressure sides use the same capillary length, which is twice the length of the capillary. This increases the effect of temperature on the overall performance of the transmitter.
   • That is, if the process temperature is 150°C or less and the process conditions allow it. Then remove the high side port capillary and connect directly to the transmitter. The length of the capillary can be shortened. Reduce the impact of temperature changes on transmitter accuracy and response time.

5. Choose according to the chemical properties of the measuring medium.
   • The corrosiveness of the same medium with different concentrations at different temperatures is also different.
   • Diaphragm sealed pressure transmitter, generally the inner diaphragm box is made of stainless steel. Wetted outer capsules are selected according to the characteristics of the medium.
   • At present, the commonly used materials are 316L, Monel, hafnium alloy and Tan diaphragm.
     Consider the housing material of the pressure transmitter according to environmental conditions and economy. Shell materials generally include aluminum alloy and stainless steel. If not in highly corrosive environmental conditions. It is more economical to choose aluminum alloy material.

Extended reading: How do you calibrate a smart pressure transmitter?

High Temperature Differential Pressure Transmitter

The high temperature differential pressure transmitter is only an instrument that can be used to measure the differential pressure of the medium under high temperature conditions.

It can work stably at 600℃ ultra-high temperature for a long time. Maintain the same high precision, high reliability and high stability as conventional single crystal silicon transmitters. Cost-effective. These three factors are the difficult points of Sino-inst technology research.

The brief principle of remote differential pressure transmitter for measuring 600℃-800℃ ultra-high temperature medium pressure is as follows:

The outer end faces of the connecting flange and the isolation flange are welded with the measuring diaphragm (meeting the requirements of the diaphragm’s resistance to medium corrosion) and the isolation diaphragm (conventional 316L diaphragm).

The heat sink is welded between the connection flange and the isolation flange, and then the ultra-high temperature resistant high-viscosity high-temperature filling liquid is injected to form an ultra-high temperature filling liquid cavity.

Weld the mating flange on the other end of the spacer flange. Connect capillary and pressure transmitter, differential pressure transmitter. Inject low-viscosity high-temperature filling fluid to form an ordinary high-temperature filling fluid cavity.

When working, the pressure of the ultra-high temperature medium is transmitted to the isolation diaphragm through the ultra-high temperature-resistant high-viscosity high-temperature filling liquid.

Then, the pressure of the ultra-high temperature medium is transmitted to the pressure transmitter and the differential pressure transmitter body through the low-viscosity high-temperature filling liquid in the capillary. Realized pressure transmission and measurement.

With high-temperature isolation and heat dissipation, ultra-high temperatures are not directly transferred to low-viscosity, high-temperature fill fluids. Thereby protecting the high temperature remote pressure transmitter and differential pressure transmitter. The pressure measurement of ultra-high temperature medium is realized.

Especially in the power generation system with molten salt as the heat transfer medium. The molten salt temperature as high as 560°C and the corrosiveness of molten salt have put forward higher requirements for pressure transmitters.

Utilizes a combination of ultra-high temperature silicone oil and an internal isolating diaphragm. The application temperature of the site is greatly increased to about 600 ℃. Greatly expands the application range of ultra-high temperature pressure/differential pressure measurement. It can be widely used in coal chemical industry and solar thermal power generation industry.

The selection ideas and methods of 600°C ultra-high temperature remote pressure transmitter/remote differential pressure transmitter are the same as those of conventional single crystal silicon remote pressure transmitter and remote differential pressure transmitter, and will not be repeated here. .

If you encounter high temperature measurement problems, welcome to communicate with Sino-Inst.

Extended reading: Industrial Pressure Transmitters|Buy from the manufacturer

Cooling Element

Cooling Element is mostly used in pressure gauges and High Temperature Pressure Transducers.

Cooling elements should be constructed of stainless steel to provide maximum corrosion resistance to most process media.
Female thread 20×1.5 and male thread 20×1.5 are standard.
Also supports customized according to customer requirements.

Extended reading:  Tri Clamp Sanitary Thermometers

Temperature and Pressure Sensor

Combined pressure and temperature sensor for Simultaneous measurement of pressure and temperature.

The Combined pressure-temperature sensor uses a special core. Thermocouple types are: J, K, E type or PT100 platinum resistance. Integrated structure of temperature and pressure. Measure the medium pressure and temperature at the same point at the same time. The combined pressure and temperature sensor has a built-in temperature / pressure sensor. The two outputs do not affect each other. Consuming the power of one sensor can complete the pressure and temperature measurement. Widely used in scientific research, military industry, petrochemical, electric power, metallurgical machinery and environmental protection fields. Such as oil well temperature and pressure measurement, diesel engine common rail temperature and pressure measurement, injection machinery temperature and pressure measurement.

Extended reading: Flat Pressure Sensor for High Viscosity Fluids

Frequently
Asked
Questions

Help Center

Does temperature affect pressure transducer?

Yes. Temperature affects pressure transducers.
Temperature has a major impact on the functionality and operating life of most electronic devices. This is especially true for electronic pressure sensors.

This is why pressure sensor specifications generally include small and large values for operation, storage, and compensation of medium temperature. Exceeding these ranges can introduce unexpected errors in pressure readings. Or in extreme cases, leading to the failure of the complete instrument.

Another temperature specification – calibration temperature – can also be included in the data sheet.

Extended Reading: Selection of pressure transmitter

What is a high pressure transducer?

High pressure transducer is used to measure high pressure up to 1500Mpa. Also called ultra high pressure transducer.

High pressure transducer adopts ultra high pressure design. Suitable for high pressure applications up to 15000bar. SI-702S series ultra high pressure pressure transducer can provide reliable ultra-high pressure measurement. Ultra high pressure transmitter adopts rare metal alloy material. After special process treatment, integrated design. All stainless steel welding package. Laser resistance temperature compensation. With high performance digital processing circuit. The factory has undergone high and low temperature aging and long-term fatigue tests. Good long-term stability. Ultra-long working life. Maintain safe and stable operation in the ultra-high pressure range.

Which pressure transducer is useful for high pressure measurement?

This depends on the user’s highest pressure requirements. Our common pressure transmitters also have a certain pressure range. If the customer is ultra-high pressure, such as 700MPa or even higher pressure. Sino-Inst supports customization.

Related Products

Related Blogs

High Temperature Pressure Transducers are used in applications, where the media temperature exceeds the temperature limits of standard pressure transmitters.
Or where it is not possible to fit a standoff pipe,
pigtail or other cooling devices to reduce media temperature.

As high temperature pressure transducer manufacturer, Sino-Instrument supplies High Temperature Pressure Transducer with Best Price.

For example:
High Temperature Pressure Transducer, measure high temperature liquid, high temperature 300 degrees. The reference price is USD 200.00/pc.
High Temperature Pressure Transducer, measuring compressed air, high temperature 800 degrees. The reference price is USD 790.00/pc.

Tolerant to high-temperature applications such as steam, food processing & engine monitoring.

If you have a special request, you can just contact us for Technical Support.

Request a Quote

KimGuo11

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

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

drurylandetheatre.com

What Is Static Water Pressure?

Definition of Static Water Pressure: Static Water Pressure refers to the pressure on water when it is stationary or moving in a straight line at a constant speed. Static Water Pressure is also called hydrostatic pressure. In fluid dynamics, many authors use the term static pressure, not just pressure, to avoid ambiguity. In general, however, the word “static” can be discarded, and the pressure in use is the same as the static pressure at a given point in the fluid.

RFQ

How to Calculate static water pressure?

Static Water Pressure Formula

Static Water Pressure or Hydrostatic pressure in a liquid can be calculated as:

p = ρ*g*h

Where:

p = pressure in liquid (N/m2, Pa, lbf/ft2, psf)

ρ = density of liquid (kg/m3, slugs/ft3)

g = acceleration of gravity (9.81 m/s2, 32.17405 ft/s2)

h = height of fluid column – or depth in the fluid where pressure is measured (m, ft)

Extended reading: Static pressure vs dynamic pressure vs total pressure

Height of Water Column to Pressure

Extended reading: extrusion melt pressure transducer

Extended reading: Pressure Sensor Applications-Featured Industry Applications

Static Water Pressure Calculator

The Static Water Pressure Calculator can easily and quickly calculate the pressure value. Here is a nice online tool:

Open: Hydrostatic Pressure Calculator

Static Water Pressure Gauge

In the process of industrial process control and technical measurement, because the elastic sensitive element of the mechanical water pressure gauge (Static Water Pressure Gauge) has the characteristics of high mechanical strength and convenient production, the mechanical water pressure gauge is widely used.

The elastic sensing element in the Static Water Pressure Gauge elastically deforms as the pressure changes. Static Water Pressure Gauge adopts spring tube (Bourdon tube), diaphragm, diaphragm, bellows and other sensitive components and is classified according to this. The measured pressure is generally regarded as relative pressure. Generally, the relative point is selected as atmospheric pressure.

The elastic deformation of the elastic element under the action of medium pressure is amplified by the gear transmission mechanism of the water pressure gauge. The water pressure gauge will display the relative value (high or low) relative to the atmospheric pressure.

The pressure value within the measurement range is displayed by the pointer. The indication range of the dial is generally 270 degrees.

It can be divided into precision water pressure gauge and general water pressure gauge. The measurement accuracy levels of precision water pressure gauges are 0.1, 0.16, 0.25, 0.4 and 0.05 respectively. The measurement accuracy levels of general water pressure gauges are 1.0, 1.6, 2.5 and 4.0 respectively.

Extended Reading: Up to 800°C High Temperature Pressure Sensor

Static Pressure vs Dynamic Pressure

Extended Reading: LORA water meter

Water Pressure Is Measured by Which Instrument

In industry, there are multiple instrument options for measuring the static pressure of water.

For example. If you need to measure the water pressure on the pipeline, you can choose a water pressure gauge or a pressure transmitter.

If you need to measure the water pressure in the tank, you can use a diaphragm pressure or differential pressure transmitter.

If Need to measure the pressure of downhole water, you can use a submersible level sensor. The latter two are also commonly used for water level measurement.

Read More: Hydrostatic Level Measurement

Read more about: How to Calculate Pressure Drop in a Pipe?

Related Blogs

Sino-Inst offers over 20 Static Pressure/Hydrostatic Pressure Transmitter. A wide variety of Static Pressure/Hydrostatic Pressure Transmitter options are available to you. Such as free samples, paid samples.  Read more about: What Are 0-10V Pressure Transducers?

Sino-Inst is a globally recognized manufacturer of Static Pressure/Hydrostatic Pressure Transmitters, located in China. Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Static Pressure/Hydrostatic Pressure Transmitters products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

Request a Quote

KimGuo11

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

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

drurylandetheatre.com

The Hydrostatic Pressure Transmitter measures the hydrostatic pressure exerted by a hydrostatic head. Use these hydrostatic pressure transmitters to measure the liquid level in storage tanks, processing vessels, collection tanks, pump inlet heads. And other applications use hydrostatic pressure to determine the liquid height. The pressure transmitter used to measure liquid level can be called: pressure liquid level transmitter. It is mainly used for open non-pressure vessels. One is submersible type, and the other is flat film installation.

RFQ

You may often hear Hydrostatic Pressure Transmitter or static pressure transmitter. So are they the same? What is their role? Next, the Sino-Inst engineer will take you to take a look.

What Is Static Pressure?

Static pressure refers to the pressure on the surface of an object when it is stationary or moving in a straight line at a constant speed. The unit is pa. Static pressure plus dynamic pressure equals total pressure.

Static pressure pile construction is a pile-driving process in which the pile driver’s own weight and the counterweight on the frame provide reaction force through the pile driving mechanism of the static pile driver to press the pile into the soil. This kind of pile driving method completely avoids the vibration, noise, and pollution caused by hammering pile driving. Therefore, it has the advantages of no noise, no vibration, no impact, no pollution, etc. during construction.

Advantages: no noise, no vibration, no impact
Field: Fluid Dynamics

1. The pressure generated by the fluid when it is at rest.
2. The pressure perpendicular to the direction of fluid movement generated by the fluid when it flows.
3. The gauge pressure value measured in a fluid that is not affected by the flow rate.

Extended reading: Static pressure vs dynamic pressure vs total pressure

Static pressure conversion table

Pa	mmH2O	inH2O	mmHg	Kgf/cm²	Atm	Bar	1bf/in²
1	0.10197	4.017mili	7.5mili	10.197u	9.869u	10u	14.5mili
9.30665	1	39.39mili	73.553mili	100u	96.78u	98.08u	1.422mili
249	25.4	1	1.8683	2.54mili	2.46mili	2.48mili	36.1mili
133.228	13.5947	0.535	1	1.359mili	1.3158mili	1.3332mili	19.337mili
98.0665k	10k	393.7	735.53	1	`0.9673	0.930665	14.2231
101.325k	10.332k	407.1	760	1.03323	1	1.01325	14.6960
100k	10.197k	401.8	750	1.01972	0.986923	1	14.5038
6.895k	703.1	27.686	69.61	70.31mili	63.05mili	63.95mili

1in=25.4mm ; 11b=445g ; k=1000; mili=0.001 ; u=0.00000

Extended Reading: Electronic Pressure Switch for Air Compressor

What Is Hydrostatic Pressure?

Hydrostatic pressure is the pressure exerted on an object by a homogeneous fluid. This is a kind of Omni-directional force, and it is evenly applied to all parts of the surface of the object. The increase in hydrostatic pressure will reduce the volume of the stressed object, but will not change its shape.

The pressure on the rock deep inside the earth’s crust is similar to this. It comes from the overlying rock layer and is called lithostatic pressure. There is also strong pressurization of the capacity load of water.

Extended reading: Industrial Pressure Transmitters|Buy from the manufacturer

Hydrostatic Level Measurement

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

Hydrostatic level measurement is based on the principle that the Hydrostatic is proportional to the height of the liquid. Hydrostatic submersible pressure level transmitter is the most commonly used level measurement sensor. Of course, the differential pressure transmitter can also measure the liquid level. A hydrostatic level sensor is a submersible pressure transmitter that has a pressure diaphragm at the end of level probe. A hydrostatic level sensor is a submersible pressure transmitter that has a pressure diaphragm at the end of level probe. This Hydrostatic is caused by the weight of the fluid on top of the transmitter and is used to calculate the level. And the inner side of the diaphragm is vented to atmospheric pressure.

Extended reading: wireless pressure transmitter working principle

Featured Static Pressure/Hydrostatic Pressure Transmitters

Hydrostatic Level Measurement Calculation

Liquid level sensors based on hydrostatic liquid level measurement usually measure the filling height of the container according to the following principles:

The liquid passes its specific gravity and gravity. The gravity increases with the filling height. This kind of gravity, which increases with the increase of the filling height, is called a liquid column.

So, if a static pressure type liquid level sensor is selected. This transmitter will measure the corresponding height of gravity of the liquid column as the hydrostatic pressure. Based on the measured hydrostatic pressure and product density. Now you can also calculate the filling height of the container.

Extended reading: What is flush diaphragm?

Hydrostatic level measurement has enjoyed a high reputation for many years and represents 40% of the market share. It is by far the most common electronic liquid level measurement method. Most importantly, it is well known for its high reliability and low installation cost. Therefore, users think that hydrostatic level measurement is very simple and powerful.

Extended reading: Silicon Pressure Sensor

Hydrostatic Level Transmitter Advantages and Disadvantages

About Hydrostatic level transmitter advantages and disadvantages, we do a simple analysis here. If you want to know more about the advantages and disadvantages of level transmitters. Please refer to Sino-Inst Level Transmitters.

Extended reading: High accuracy pressure transducers

Static Pressure Effect in Pressure Transmitter

Static pressure is easy to understand. It is the maximum bearable pressure.

For example, the differential pressure range you measure is 0-1KPa. This pressure may be that the pressure on one side is 0. The other side is 1KPA. At this time, the maximum static pressure is 1KPA.

The differential pressure range you measure is 0-1KPa. This pressure may be that the pressure on one side is 10000KPa and the other side is 10001KPA. At this time, the maximum static pressure is 10001KPA.

Although the measuring range is the same. The pressure displayed by the transmitter is the same. But the static pressure value of the two pressure transmitters is completely different. The sensor selected for the transmitter is also different.

The verification of the influence of the static pressure of the pressure transmitter is as follows:

1. Connect the high and low pressure chambers of the transmitter to the atmosphere and measure the lower limit of output.
2. Introduce the static pressure to slowly change from atmospheric pressure to rated working pressure. After stabilizing for 3 minutes, measure the lower limit of output. And calculate the difference of the lower limit of output to atmospheric pressure.
3. Transmitter with adjustable input range. Except for special regulations, the static pressure influence verification should be carried out on the smallest range. After verification, it should be restored to the original range.

Extended reading: Best Price Ceramic Pressure Sensor

High Static Differential Pressure Transmitter

The high static pressure differential pressure transmitter is used to measure the level, flow and pressure of liquid, gas or steam in a high working pressure environment. Then it is converted into a 420mA DC signal output. The HP intelligent type can communicate with the HART handheld communicator. Use it to set up, monitor or form an on-site monitoring system with the host computer.

Influence of static pressure

①Zero point: ±0.2% URL under 31027kPa static pressure. The zero point error can be corrected online through zero adjustment.
②Range: can be corrected to ±0.25% output reading/6895kPa

In addition, the excellent static pressure performance of the monocrystalline silicon differential pressure transmitter is also better than that of the capacitive products on the same occasion. The optimal static pressure error can be controlled within ±0.05%/10MPa.

Extended reading: Pressure Sensor Applications In Various Industries

Hydrostatic Pressure Transmitter Price

The price of Hydrostatic Pressure Transmitter is not much different from that of ordinary pressure transmitters. The price of Hydrostatic Pressure Transmitter can be determined according to the customer’s parameters. About USD150~350.00.

Sino-Inst offers over 20 Static Pressure/Hydrostatic Pressure Transmitter. A wide variety of Static Pressure/Hydrostatic Pressure Transmitter options are available to you. Such as free samples, paid samples. 

Sino-Inst is a globally recognized manufacturer of Static Pressure/Hydrostatic Pressure Transmitters, located in China. Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Static Pressure/Hydrostatic Pressure Transmitters products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

Request a Quote

KimGuo11

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

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

drurylandetheatre.com

Intrinsically safe type is an explosion-proof type of electrical equipment. When purchasing electrical equipment, do you often hear about intrinsic safety? For example, when ordering pressure transmitters or flow meters.

Intrinsically safe instruments are intrinsically safe instruments. Also called safety spark type instrument. It means that the instrument is in the normal state and in the fault state. The sparks generated by the circuit and the system and the temperature reached will not ignite the explosive mixture.

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What is intrinsically safe?

Intrinsically safe type is an explosion-proof type of electrical equipment. It limits the electric spark or thermal effect energy that may be generated by the inside of the equipment and the connecting wires exposed to the potentially explosive environment to a level that cannot produce ignition.

ia or ib or ic. ia is the highest and ic is the lowest. See GB3836.4-2010 for details.

By controlling the energy level of the equipment itself, it is lower than the critical condition for igniting explosive gas under normal working or fault conditions. It will not produce sparks or higher than the temperature of igniting explosive gas. It does not need to be shielded or blocked by other means.

By limiting the various parameters of the electrical equipment circuit, or taking protective measures to limit the spark discharge energy and thermal energy of the circuit, so that the electric spark and thermal effects generated under normal operation and specified fault conditions cannot ignite the explosive mixture in the surrounding environment. In this way, electrical explosion-proof is realized. The circuit of this kind of electrical equipment itself has explosion-proof performance. That is to say, it is “essentially” safe. So it is called intrinsically safe. Electrical equipment using intrinsically safe circuits is called intrinsically safe electrical equipment.

Because the circuit of intrinsically safe electrical equipment is inherently safe. The sparks, arcs, and heat generated will not ignite the explosive mixture in the surrounding environment. Therefore, intrinsically safe electrical equipment does not require special explosion-proof enclosures. This can reduce the size of the equipment. Volume and weight. Simplify the structure of the device.

At the same time, the transmission line of intrinsically safe electrical equipment can use glue lines and bare wires. It can save a lot of cables.

Therefore, intrinsically safe electrical equipment has the characteristics of safety and reliability, simple structure, small size, lightweight, low cost, convenient manufacturing, and maintenance, etc. It is an ideal explosion-proof electrical equipment.

However, since the maximum output power of intrinsically safe electrical equipment is about 25W, the range of use is limited.

Intrinsically safe electrical equipment is mainly used in communication, monitoring, signal, and control systems, as well as instruments and meters.

Extended reading: How To Install The Pressure Sensor When Measuring The Flow Pipeline?

What are the specifications and guidelines for intrinsic safety?

ATEX (Europe)

The European Union Directive 94/9/EC often referred to as ATEX (“Atmospheric Explosion”). It is the main European regulation for protection systems and equipment used in potentially explosive atmospheres.

The purpose is to serve as a unified directive to lay the foundation for the necessary health and safety requirements. Replace existing different national and European legislation.

The directive is mandatory for electrical and electronic equipment sold in Europe on July 1, 2003 and used in environments affected by explosion hazards.

The ATEX directive has now been adopted all over the world.

NEC (United States)

The National Electrical Code (NEC) is the basis for all electrical codes in the United States. NEC 500 and 505 cover the classification of hazardous areas and related product identification.
NEC 500 explained that it is a long-term regulation. It has been adopted all over the world, except in Europe. NEC 505 is similar to ATEX.

Intrinsically safe symbol

After evaluation, each approved intrinsic safety device should meet ATEX and NEC or Factory Manual standards. Through the corresponding grade system, you can know which areas, protection types, gas groups, and temperature grades the instrument has been approved for.

Example: Fluke 707ex conforms to ATEX II 2 G Ex ia IIC T4

Read more about: What Is the Difference Between Class 1 Div 1 and Class 1 Div 2 ?

Definitions of Hazardous Areas

According to the frequency and duration of the explosive environment, the hazardous area is divided into different areas.
The gas field is divided into three areas: Zone 0, Zone 1, and Zone 2.

The dust site is divided into three areas: Zone 20, Zone 21, and Zone 22:

Intrinsically safe certification

Intrinsically safe explosion-proof certification technology is currently standardized and suitable for zone 0 technology. For automation instruments, the most commonly used explosion-proof types are intrinsically safe, explosion-proof, and increased safety.

However, due to the rapid development of electronic technology and the continuous birth of low-power electronic devices. So that the promotion and application of intrinsically safe explosion-proof technology has a broader space. Especially because the intrinsically safe explosion-proof type is compared with other explosion-proof types. It not only has a simple structure but also has a wide range of applications. It also has the characteristics of easy operation and convenient maintenance. Therefore, this kind of intrinsically safe explosion-proof, which suppresses the ignition source energy as an explosion-proof method, has been accepted by instrument manufacturers and users.

1. Basic principles of intrinsically safe explosion-proof certification technology

Electric sparks and thermal effects are the main sources of ignition that cause explosive hazardous gas explosions. Intrinsic safety is achieved by limiting the energy of two possible ignition sources: electric spark and thermal effects.

Under normal working and fault conditions, when the energy of the electric spark or thermal effect that the meter may produce is less than this energy. It is impossible for the instrument to ignite explosive dangerous gas and cause an explosion.

The principle is to start with limiting energy. Reliably limit the voltage and current in the circuit to an allowable range. In order to ensure that the electric spark and thermal effects generated by the instrument in normal operation or short-circuit and component damage, etc., will not cause the explosion of dangerous gases that may exist around it.

2. Features of intrinsically safe explosion-proof certification technology

Intrinsically safe explosion-proof technology is actually a low-power design technology. Usually, for hydrogen (IIC) environment, the circuit power must be limited to about 1.3w.

It can be seen that intrinsically safe technology can be well applied to industrial automation instruments.

Compared with any other explosion-proof type. The use of intrinsically safe explosion-proof technology can bring the following technical and commercial features to industrial automation instruments:

• No complicated design and manufacturing process is required. A bulky and heavy flameproof enclosure. Therefore, the intrinsically safe instrument has the characteristics of simple structure, small size, light weight and low cost. According to data, the cost ratio of establishing an intrinsically safe and flameproof switch transmission circuit is about 1:4.
• Maintenance, calibration and replacement of some parts of the instrument can be carried out under electrified conditions.
• High safety and reliability. The intrinsically safe instrument will not reduce the safety and reliability of the instrument due to the loss of the fastening bolts or the corrosion of the casing joint surface, scratches and other man-made reasons
• Because intrinsically safe explosion-proof technology is a kind of “weak current” technology. Therefore, the use of intrinsically safe instruments can avoid the occurrence of electric shock accidents of on-site engineering and technical personnel.
• Wide application range. Intrinsically safe technology is the only explosion-proof technology applicable to hazardous locations in Zone 0.
• For simple devices like thermocouples. No special certification is required to access the intrinsically safe explosion-proof system.

In summary, for automated instruments, intrinsically safe explosion-proof technology is an ideal explosion-proof technology. It will also be widely used in the design of Fieldbus intelligent instruments and their systems.

Intrinsically safe vs explosion-proof

It is often necessary to use explosion-proof instruments in industrial sites. The general industrial explosion-proof instruments are mainly explosion-proof and intrinsically safe. So, how to understand the difference between them?

Read more Intrinsically Safe vs Explosion Proof Pressure Transmitters

Choose the right intrinsically safe device for your application

Explosion Proof Pressure Transmitter

SIEP489 Explosion proof pressure Transmitter is a microprocessor-based high-performance transmitter. SIEP489 has flexible pressure calibration, push button configuration, and programmable using HART® Communication. We also supply industrial pressure sensors, and explosion proof differential pressure transmitter.

All our electronic pressure transducers can be offered with Explosion-proof. Select explosion-proof pressure transmitters with Ex d certification and 4-20mA output signals for installation. These installations require the use of equipment and enclosures designated as containing internal explosives. This prevents ignition of the explosive environment surrounding the equipment ( Specified) Flameproof area.

Intrinsically Safe Flow Meter

When do I need to choose an explosion-proof or intrinsically safe flowmeter?

Please remember that when you need to measure the medium is flammable and explosive. Be sure to tell the flowmeter manufacturer. Choose intrinsically safe or explosion-proof flow meters.

For example, to measure diesel oil, turbine flowmeters are used. The explosion-proof model must be selected.
Another example is measuring hydrogen. Use vortex flowmeter. The intrinsically safe model must be selected.

Sino-Inst offers a variety of Intrinsically Safe vs Explosion Proof Pressure-Level-Flow Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.

KimGuo11

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

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

drurylandetheatre.com

What does SCADA stand for?

SCADA is the abbreviation of Supervisory Control And Data Acquisition. Namely data acquisition and monitoring control system. SCADA system is also called monitoring configuration software, which is widely used in enterprise equipment management of equipment automatic operation.

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What is a SCADA system?

SCADA is a data acquisition and monitoring control system. The scada system is a computer-based production process control and scheduling automation system. It can monitor and control the operating equipment on site. Because each application field has different requirements for scada, the development of scada system in different application fields is not exactly the same.

The scada system is the most widely used in the power system, and the technology development is also the most mature. It is one of the most important subsystems of the energy management system (EMS system). It has the advantages of complete information, improved efficiency, correct control of system operation status, accelerated decision-making, and can help quickly diagnose system fault status. Now it has become an indispensable power dispatcher. Missing tools.

The scada system plays an irreplaceable role in improving the reliability, safety and economic benefits of power grid operation, realizing the automation and modernization of power dispatching, and improving the efficiency and level of dispatching.

How does SCADA work?

The SCADA system deploys multiple software and hardware elements, allowing industrial organizations to: monitor, collect and process data.

Connect and control machines and equipment such as valves, pumps, motors, etc. through HMI (Human Machine Interface) software.

Log the event to a log file.

In the basic SCADA architecture, sensor or manual input information is sent to PLC (Programmable Logic Controller) or RTU (Remote Terminal Unit), and then sent to a computer with SCADA software.

SCADA software analyzes and displays data to help operators and other workers reduce waste and improve the efficiency of the manufacturing process.

An effective SCADA system can greatly save time and money. Many case studies have been published, highlighting the benefits and savings of using modern SCADA software solutions such as ignition.

What is SCADA used for?

The SCADA system has a wide range of applications, and it can be used in the fields of data acquisition, monitoring and control and process control in electric power, metallurgy, petroleum, chemical, gas, railway and other industries. Its functions mainly focus on four aspects: real-time collection of production data, process monitoring of production equipment, abnormal alarms of production equipment, data analysis, data reports and dashboard display. Its characteristics mainly reflect the following aspects.

1. It supports more than 5000 communication protocols and meets the communication requirements of 99.99% of controllers and instruments on the market. Get through the automated hardware system and the information transmission of the information software system.
2. Isolate office network IP and industrial equipment IP in hardware to avoid IP conflicts.
3. Intuitive display of production dynamics, direct or indirect control of on-site equipment, to meet the needs of visual management.
4. Perform statistical analysis of data and display it through the dashboard.

The SCADA system is centered on the data collected in the production process. It is related to the distribution of people, machines, materials, methods, environments, testing, and R&D. It is based on the data generated during the operation of production equipment. It is also a big Most companies are most concerned about.

Secondly, the SCADA system is aimed at the application needs of the above-mentioned manufacturing enterprises. At the same time, it will give play to its own unique advantages to bring improvements and benefits to the enterprise.

1. Help companies collect all kinds of data in the production process in real time. Instead of manual operations, it also avoids certain losses caused by personnel errors. Not only improves work efficiency, but also enables real-time monitoring of production All abnormal data in the process provides another layer of guarantee for the quality of the product.
2. The SCADA system provides the production data of each device, which makes the production situation intuitive and clear, and facilitates the analysis of the production situation by the management personnel of the enterprise, and at the same time helps the enterprise optimize the production, making the production plan more scientific and reasonable.
3. Realize the digital and intelligent improvement of the management process of products, production schedule, production efficiency, quality information, equipment operation, etc., and optimize the digital management and control capabilities of the production process.
4. During the company’s external publicity and visit, the company’s image and professionalism will be improved by explaining the application and advantages of the system for the company.

Extended reading: PID Controller Working Principle

The difference between SCADA, DCS and PLC

SCADA and DCS are a concept, and PLC is a product, the three are not comparable:

1. PLC is a product, which can form SCADA, DCS;
2. DCS is developed from process control, and PLC is developed from relay-logic control system;
3. PLC is equipment, DCS and SCADA are systems.

In a narrow sense, DCS is mainly used for process automation. PLC is mainly used for factory automation (production line). SCADA is mainly used for wide-area needs. Such as oil fields, which stretch for thousands of miles of pipelines.

If they are unified from the perspective of computers and networks, the main reason for the differences lies in the application requirements. DCS often requires advanced control algorithms.

For example, in the oil refining industry, PLC requires high processing speed. Because it is often used in interlocking, even fail-safe systems. SCADA also has some special requirements. Such as vibration monitoring, flow calculation, peak and valley adjustment, and so on.

Therefore, you can simply think:

• SCADA is the dispatch management layer
• DCS is the plant management
• PLC is the field device layer

Sino-Inst offers over controllers for Industrial data recording and analysis.

It is widely used in hydropower, tap water, petroleum, chemical, machinery, hydraulic and other industries to measure, display and control the pressure of fluid media on site.

A wide variety of controllers are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of controllers, located in China.

KimGuo11

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

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

drurylandetheatre.com

What is a PID controller?

A PID controller is an instrument used in industrial control applications to regulate temperature, flow, pressure, speed, and other process variables. PID is the abbreviation for proportional integral derivative. PID controllers use a control loop feedback mechanism to control process variables and are the most accurate and stable controllers.

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Remote Recorders

What is meant by PID?

In the manufacturing process, if the equipment or space needs to be kept at a constant temperature, then PID is the best choice.
What is meant by PID?

P: Proportion, the input deviation is multiplied by a coefficient;
I: Integral, perform an integral operation on the input deviation;
D: It is differentiation, which performs a differential operation on the input deviation.

Mathematical description of PID:
u(t)=kp[e(t)+1/TI∫e(t)dt+TD×de(t)/dt].
Where
E(t) is the error signal;
U(t) is the output signal of the controller;
kp is the ratio coefficient;
TI is the integral time constant;
TD is the derivative time constant.

PID control is a kind of negative feedback control. Because in the feedback control system, the automatic regulator and the controlled object form a closed loop.

There are two possible situations when connected into a closed-loop: positive feedback and negative feedback.

The effect of positive feedback aggravates the imbalance of the inflow and outflow of the controlled object, resulting in system instability;

Negative feedback is to alleviate the imbalance, so as to correctly achieve the purpose of automatic control.

The instrument used in PID control is a PID regulator (also called a PID controller). Simply put, the PID control algorithm determines the price of the PID regulator. The temperature controller is also a kind of control algorithm that is more suitable for temperature control PID regulator. Its control algorithm is different from the regulator control algorithm commonly used for process control such as flow and pressure.

PID Controller Working Principle

PID controller, Promotion Integration Differentiation, that is, proportional-integral-derivative controller. It is mainly through the setting of three parameters Kp, Ki, and Kd. It is used to control the basic linearity and dynamic characteristics that do not change with time.

PID controller is based on the PID control principle to adjust the deviation of the entire control system. So that the actual value of the controlled variable is consistent with the predetermined value required by the process. Different control laws are applicable to different production processes. The corresponding control law must be selected reasonably. Otherwise, the PID controller will not achieve the expected control effect.

PID controller is a kind of feedback loop component that is very common in industrial control applications. This controller compares the collected data with a reference value. This difference is then used to calculate the new input value. The purpose of this new input value is to allow the system data to reach or maintain the reference value.

The PID controller can adjust the input value based on historical data and the occurrence rate of differences. This can make the system more accurate and more stable. It can be proved by mathematical methods. When other control methods lead to system stability errors or process repetitions, a PID feedback loop can keep the system stable.

Video source: https://www.youtube.com/watch?v=v27xYKdZUzI

PID Temperature Controller Working Principle

Proportional integral derivative (PID) controllers can be used as a means to control temperature, pressure, flow, and other process variables. As the name suggests, PID controllers combine proportional control with additional integral and derivative adjustments. Help the equipment to automatically compensate for changes in the system.

Computer-controlled thermostat: Using PID fuzzy control technology* Use advanced digital technology to form a fuzzy control to solve the problem of inertial temperature error through the combination of Pvar, Ivar, and Dvar (proportional, integral, derivative).

Many manufacturers often encounter the problem of inertial temperature error in the process of using the thermostat. Suffering cannot be solved, relying on manual pressure adjustment to control the temperature.

PID controller Applications

The PID controller is the most widely used controller. There are many digital pid algorithms.
PID controllers are mostly used for temperature control. But there are other more advanced and lower-level programs.

The PID regulator used by the instrument ranges from tens of yuan to tens of thousands of yuan. The difference lies in IO precision, type, algorithm complexity, operation speed, and additional functions.

The PID algorithm used by PLC is also different. Usually simpler than meters.

In the field of temperature control, there are PID meters, smart fuzzy meters, fuzzy PID meters, and even industrial computers.

If the temperature control also needs to control the temperature rise curve, then a simple PID meter is not suitable. A set value generator is also needed, and most intelligent thermostats with this function are built-in.

1. Classic PID control algorithm regulator

For example, the accuracy is 0.5%. The intelligent regulator is used for process control such as pressure, flow, and liquid level to achieve good control effects. The temperature control effect is not good when used for temperature control.

2. Fuzzy control algorithm regulator

Such as accuracy of 0.3%. The fuzzy PID regulator is used for pressure, flow, liquid level, and other process control effects. It is best for temperature control in plastic/food/packaging machinery, heating furnaces, and other industries with a constant temperature effect of ±1℃. PID parameter self-tuning effect is excellent It is the classic PID control algorithm regulator. The price of the two is the same.

3. Artificial intelligence control algorithm regulator

Such as an accuracy of 0.2%. This artificial intelligence regulator is suitable for all automatic control sites and can achieve very good control effects. The best constant temperature effect for temperature control is ±0.1℃. The effect of PID parameter self-tuning is better than the adjustment of classic PID control algorithms and fuzzy control algorithms The price is slightly higher. Product performance is no different from European and American products.

4. Temperature controller

Such as an accuracy of 0.2%. The temperature controller is dedicated to the temperature control of various large lag working conditions (such as kilns, electric furnaces). The temperature is constant and does not fluctuate. The performance is not much different from that of Japanese island power products. The cost is lower.

Related measurement and control instruments

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Sino-Inst offers over 10 PID controllers for Industrial data recording and analysis.

It is widely used in hydropower, tap water, petroleum, chemical, machinery, hydraulic and other industries to measure, display and control the pressure of fluid media on site.

A wide variety of PID controllers are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of PID controllers, located in China.

KimGuo11

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

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

drurylandetheatre.com

What is a piezoelectric pressure sensor?

The piezoelectric pressure sensor is a sensor that uses the piezoelectric effect of piezoelectric materials to convert the measured pressure into an electrical signal. Use electrical components and other machinery to convert the pressure to be measured into electricity. Measuring precision instrument for related measurement work. Such as pressure transmitters and pressure sensors.

RFQ

More Pressure Sensors

Piezoelectric pressure sensor working principle

Piezoelectric pressure sensors are mainly based on the piezoelectric effect (Piezoelectric effect). Use electrical components and other machinery to convert the pressure to be measured into electricity. Then perform measurement precision instruments such as pressure transmitters and pressure sensors.

Piezoelectric sensors can not be used in static measurement. The reason is the electric charge after the action of external force. When the circuit has infinite input resistance, it can be preserved.

But this is not the case.

Therefore, piezoelectric sensors can only be used in dynamic measurements.

Its main piezoelectric materials are: dihydrogen phosphate, sodium potassium tartrate and quartz. The piezoelectric effect is found on quartz.

When the stress changes, the electric field changes very little, and some other piezoelectric crystals will replace quartz.

Potassium sodium tartrate, it has a large piezoelectric coefficient and piezoelectric sensitivity. However, it can only be used indoors where the humidity and temperature are relatively low.

Dihydrogen phosphate is a kind of artificial crystal. It can be used in high humidity and high temperature environment. Therefore, its application is very wide.

With the development of technology, the piezoelectric effect has also been applied to polycrystals. For example: piezoelectric ceramics, niobate magnesium acid piezoelectric ceramics, niobate series piezoelectric ceramics and barium titanate piezoelectric ceramics, etc. are included.

The sensors based on the piezoelectric effect are electromechanical conversion and self-generation sensors. Its sensitive components are made of piezoelectric materials.

When the piezoelectric material is subjected to an external force, an electric charge will be formed on its surface. The electric charge will be amplified by the charge amplifier, the measuring circuit and the impedance converted. It will be converted into an electrical output proportional to the external force received.

It is used to measure force and non-electrical physical quantities that can be converted into force. For example: acceleration and pressure.

It has many advantages: lighter weight, reliable work, simple structure, high signal-to-noise ratio, high sensitivity and signal bandwidth, etc.

But it also has some shortcomings: some voltage materials are protected from moisture. Therefore, a series of moisture-proof measures need to be taken. And the output current response is relatively poor. Then it is necessary to use a charge amplifier or a high input impedance circuit to make up for this shortcoming. Make the instrument work better.

Extended reading: Silicon Pressure Sensor

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Piezoelectric pressure sensor advantages and disadvantages

1. The advantages are bandwidth, high sensitivity, high signal-to-noise ratio, simple structure, reliable work, and lightweight.
2. The disadvantage is that some piezoelectric materials need moisture-proof measures. And the output DC response is poor. It is necessary to use a high input impedance circuit or a charge amplifier to overcome this defect.

Extended Reading: Digital Pressure Sensor-RS485

The working principle of 5 common pressure sensors

In addition to the Piezoelectric Pressure Sensors described in this article, there are many pressure transmitters and pressure sensors that can convert pressure into electrical signals.

So how do these pressure transmitters and pressure sensors convert pressure signals into electrical signals? What are the characteristics of different conversion methods?

Here, I have summarized the measurement principles of several common pressure sensors for everyone. hope that it can help us.

Piezoresistive pressure sensor

Piezoresistive pressure sensors are mainly based on the piezoresistive effect (Piezoresistive effect). The piezoresistive effect is used to describe the resistance change of a material under mechanical stress.

Unlike the piezoelectric effect described above, the piezoresistive effect only produces impedance changes, and does not generate electric charges.

Most metal materials and semiconductor materials have been found to have a piezoresistive effect. Among them, the piezoresistive effect in semiconductor materials is much greater than that in metals.

Extended reading: wireless pressure transmitter working principle

Because silicon is the mainstay of today’s integrated circuits. The application of piezoresistive elements made of silicon becomes very meaningful.

Piezoresistive pressure sensors are generally connected to Wheatstone bridges through lead wires.

Normally, the sensitive core has no applied pressure, and the bridge is in a balanced state (called zero position). When the sensor is pressed, the chip resistance changes, and the bridge will lose balance.

If a constant current or voltage power supply is added to the bridge. The bridge will output a voltage signal corresponding to the pressure. In this way, the resistance change of the sensor is converted into a pressure signal output by the electric bridge.

The bridge detects the change in resistance value, and after amplification, it undergoes voltage and current conversion. Converted into the corresponding current signal. The current signal is compensated by the nonlinear correction loop. That is, a standard output signal of 4-20mA with a linear corresponding relationship between the input voltage is produced.

In order to reduce the influence of temperature changes on the resistance of the core, and improve the measurement accuracy. The pressure sensor adopts temperature compensation measures to maintain a high level of technical indicators such as zero drift, sensitivity, linearity, and stability.

Extended Reading: Electronic Pressure Switch for Air Compressor

Capacitive pressure sensor

The capacitive pressure sensor is a pressure sensor that uses capacitance as a sensitive element to convert the measured pressure into a change in capacitance value.

This kind of pressure sensor generally uses a circular metal film or a metal-plated film as an electrode of the capacitor. When the film deforms under pressure, the capacitance formed between the film and the fixed electrode changes.

The electrical signal that has a certain relationship with the voltage can be output through the measuring circuit.

The capacitive pressure sensor is a capacitive sensor with a variable pole pitch. It can be divided into a single capacitive pressure sensor and a differential capacitive pressure sensor.

Read more about Capacitive pressure transducer.

Electromagnetic pressure sensor

A variety of sensors that use electromagnetic principles are collectively referred to. They mainly include inductive pressure sensors, Hall pressure sensors, and eddy current pressure sensors.

Extended reading: how to calibrate a pressure transmitter

The working principle of inductive pressure sensors is due to the different magnetic materials and permeability.

When the pressure acts on the diaphragm, the size of the air gap changes, and the change of the air gap affects the change of the inductance of the coil. The processing circuit can convert the change of this inductance into the corresponding signal output. So as to achieve the purpose of measuring pressure.

This kind of pressure sensor can be divided into two types according to the change of the magnetic circuit: variable magnetic resistance and variable magnetic permeability. The advantages of inductive pressure sensors are high sensitivity and large measuring range. The disadvantage is that they cannot be used in high-frequency dynamic environments.

Hall pressure sensors are made based on the Hall effect of certain semiconductor materials.

The Hall effect refers to when a solid conductor is placed in a magnetic field and a current flows through it.

The charge carriers in the conductor are biased to one side by the Lorentz force. Then a voltage (Hall voltage) is generated. The electric field force caused by the voltage will balance the Lorentz force.

Through the polarity of the Hall voltage, it can be confirmed that the current inside the conductor is caused by the movement of negatively charged particles (free electrons).

Eddy current pressure sensor is a pressure sensor based on the eddy current effect.

The eddy current effect is caused by the intersection of a moving magnetic field and a metal conductor, or the intersection of a moving metal conductor and the magnetic field perpendicularly.

In short, it is caused by electromagnetic induction effects. This action creates a current circulating in the conductor.

Extended reading: What is a pressure sensor?

Vibrating wire pressure sensor

Vibrating wire pressure sensor is a frequency sensitive sensor.

This kind of frequency measurement has the desired high accuracy. Because time and frequency are physical parameters that can be accurately measured. And the frequency signal can ignore the influence of cable resistance, inductance, capacitance and other factors during the transmission process.

At the same time, the vibrating wire pressure sensor also has strong anti-interference ability, small zero drift, good temperature characteristics, simple structure, high resolution, stable performance. It is convenient for data transmission, processing and storage. It is easy to realize the digitalization of the instrument.

Therefore, vibrating wire pressure sensors can also be used as one of the development directions of sensing technology.

Extended reading: Best Price Ceramic Pressure Sensor

What Is Flush Diaphragm Pressure Sensor?

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

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

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

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

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

KimGuo11

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

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

drurylandetheatre.com