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.
Explosion Proof Pressure transmitter refers to a pressure sensor with explosion-proof or intrinsically safe housing. Suitable for hazardous and explosive areas.
Explosion Proof Pressure transmitter, or explosion-proof pressure transducer, with the explosion-proof enclosure. For applications in hazardous areas. Class I, Division 1. Flameproof ExdIIBT5Gb; Intrinsically safe ExiaIICT4/T5/T6Ga. SIEP489 has flexible pressure calibration, push-button configuration, and programmable using HART® Communication. 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.
Sino-Inst offers a variety of Explosion-proof pressure sensors for industrial pressure measurement. If you have any questions, please contact our sales engineers.
We can provide maintenance, calibration and other services of the same type of products. Such as WIKA, Rosemount pressure transmitter.
Contact us now to see how we can help you with a pressure gauge solution that fits your exact needs.
Know More About Explosion proof pressure transmitter
Explosion-proof pressure transmitters are available in a wide range of specifications, easy to install and use, safe and explosion-proof. They can be widely used in petrochemical, electric power, metallurgy, pharmaceutical, food processing, and other industries.
Products comply with the “IEC” standard, and explosion-proof pressure transmitters are internationally renowned.
The company’s high-precision, high-stability pressure sensor components, through high-reliability amplifier circuit and precise temperature compensation, convert the absolute or gauge pressure of the measured medium into 4~20mA, 0~5VDC, 0~10VDC, and 1~5VDC. Such as standard electrical signals.
High-quality sensors hermetically sealed soldering technology and a complete assembly process ensures excellent quality and performance. The product is available in a variety of interface styles. And a variety of lead styles to best meet customer needs. And is suitable for use with a variety of measurement and control equipment.
Explosion proof pressure transmitter working principle
The explosion-proof pressure transmitter consists of an integrated intelligent sensor and peripheral circuits.
The sensor part is composed of a pressure sensor, a signal modulation circuit, a dedicated digital processing chip, a temperature sensor, and data memory, and the peripheral electronic circuit part is composed of an LCD display, function keys, and an EMC circuit.
The pressure signal is converted into an electrical signal by the pressure sensor. And the electrical signal is modulated. And sent to a dedicated digital processing chip for data processing. And then converted into a 4~20 mA output signal corresponding to the pressure signal. And the HART digital signal is superimposed on the current signal for communication.
Such as flammable gas, dust environment, oil refinery, petrochemical plant, gas station, gas station, etc., explosive gas environment.
Under atmospheric conditions, a mixture of combustible substances in the form of gas, steam or mist, and air. After being ignited in the mixture, the combustion will spread throughout the environment of the unburned mixture.
Such as CH4, C2H2, C2H4, NH3, CO, C2H5OH, and other explosion-proof electrical equipment.
The explosion-proof of the current pressure transmitter: mainly two forms of isolation explosion-proof and intrinsically safe explosion-proof.
Intrinsically safe explosion-proof:
“i” (Intrinsically safe electrical equipment and related equipment) Intrinsically safe circuits, circuits that cannot ignite the specified explosive gas or steam under the specified test conditions, under the specified test conditions, the electric sparks and thermal effects generated under the specified fault state . Intrinsically safe electrical equipment: All circuits are intrinsically safe electrical equipment.
Example: Intrinsic Safety: Ex ia II BT4
Flameproof:
It refers to the electrical equipment that encloses the components that can ignite the explosive mixture in a shell, and the shell can withstand the explosive pressure of the internal explosive mixture and prevent the explosion of the surrounding explosive mixture.
For example: Flameproof: Ex d II CT6
Ex(ia)ⅡC T6:
Sign
Symbol
Meaning
Explosion-proof declaration
Ex
Meet certain explosion-proof standards, such as my country’s national standards
Explosion-proof method
ia
Adopt ia-level intrinsically safe explosion-proof method, can be installed in О area
Gas category
Il c
It is allowed to involve IIC explosive gas
Temperature group
T6
The surface temperature of the instrument does not exceed 85℃
Ex（ia）ⅡC:
Sign
Symbol
Meaning
Explosion-proof declaration
Ex
Compliance with European explosion-proof standards
Explosion-proof method
ia
Adopt ia-level intrinsically safe explosion-proof method, can be installed in О area
Explosion-proof differential pressure transmitter is used to measure the liquid level, flow rate and pressure of liquid, gas or steam under high working pressure environment. Then converted into 4 ~ 20mA DC signal output. Intelligent type can communicate with HART Communicator.
High Temperature Pressure Transducer/Transmitter for measuring pressure in hot environments. Liquids or gases up to 850 ° C. Such as steam, food processing & engine monitoring.
Application of high temperature pressure transmitter in steam pipeline.
Liquid level sensors also called a water pressure sensor, or water pressure transducer. SI-10 liquid pressure sensor uses waterproof device to achieve IP68 waterproof rating. Like: water pipe pressure, oil pressure for pipe or tank.SI-10 liquid pressure sensor is a piezoresistive silicon pressure sensor.
Gas pressure sensor for industrial gas pressure monitoring. Pagoda gas nozzle Φ8. Such SI-503K Pagoda Joint Gas Pressure sensor uses stainless steel as a whole. High-precision strain gage and advanced technology. It has high sensitivity, stable performance and good impact resistance.
Sino-Inst offers over 20 Explosion Proof Pressure Transmitters. A wide variety of Pressure sensors options are available to you. Such as free samples, paid samples.
Sino-Instrument is a globally recognized manufacturer of Pressure sensors, located in China. Sino-Instrument sells through a mature distribution network that reaches all 30 countries worldwide.
Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.
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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.
Remote seal pressure transmitter, with capillary and diaphragm seal, remote mount. Diaphragm seal systems protect pressure transmitters from hot, viscous, contaminated or corrosive media.
Remote Diaphragm seal pressure transmitter with capillary is used as a level transmitter. Diaphragm Seals also called chemical seals, are used in applications where pressure sensor requires isolation from the process media. These applications are corrosive, high temperature, clogged. Or must sanitary fluids to remain in the pipeline or container. The pressure of the liquid in the process does not affect the pressure sensor. Instead, it is applied to the remote seal. And through the capillary, hydraulic pressure is transmitted to the pressure sensor. Installing and filling the diaphragm seal, the impact on instrument performance will be minimized.
Sino-Inst also offers repair, refurbishment or replacement of used transmitters with remote seals.
Features of Remote Diaphragm Seal Pressure Transmitter
Protect pressure sensor
The remote transmission diaphragm can protect the transmitter diaphragm from corrosive, aggressive or extreme temperature.
Various sealing diaphragms are available
Sino-Inst can provide a suitable sealing diaphragm according to your measurement requirements. For example, remote threaded seal, flush flanged type seals, remote flange seal-RTJ gasket surface, extended flanged seal, etc.
Suitable for special environments.
Such as: High / low temperature fluids; Highly corrosive / high viscosity fluids; Toxic fluids; The fluids containing suspended solids which are deposited in the impulse piping and may cause clogging.
Specifications of Remote Diaphragm Seal Pressure Transmitter
two-wire system, 4-20mADC + HART output, digital communication; output signal limit: Imin = 3.9mA, Imax = 20.5mA
Alarm current:
①Low report mode (minimum): 3.7mA ②High report mode (maximum): 21mA ③No report mode (hold): keep the effective current value before the fault ④Alarm current standard setting: high report mode
Response time:
the damping constant of the amplifier part is 0.1s; the time constant of the sensor and the remote flange is 0.2-6s, which depends on the range of the sensor, the range ratio, the length of the capillary, and the viscosity of the filling fluid The additional adjustable time constant is: 0.1-60s.
Ambient temperature:
minimum: depends on the filling liquid; maximum: 85 ℃; with liquid crystal display, fluorine rubber sealing ring is -20 ~ +65 ℃
ANSI standard: 150psi-600psi; DIN standard: PN1.6MPa-PN10MPa
Warm-up time:
<15s
Explosion-proof performance:
NEPSI explosion-proof license: ExdⅡCT6; NEPSI intrinsically safe license: ExiaⅡCT4; allowable temperature is -40 ～ + 65 ℃
Power and load conditions:
① The power supply voltage is DC24V, R≤ (Us-12) / Imax kΩ, where Imax = 23mA ②Max power supply voltage: 42VDC ③Minimum power supply voltage: 12VDC, 15VDC (backlit LCD display) ④Digital communication load range: 250-600Ω
Electrical connection:
M20 × 1.5 cable sealing buckle, the terminal is suitable for 0.5-2.5mm2 wire
Process connection:
The remote flange meets ANSI standard or DIN standard. Can be installed directly, please refer to the dimension drawing for flange size
Types of SMT3151 Remote Diaphragm Seal System Pressure Transmitters
3151T flange type remote pressure transmitter
The selection is as follows: 3151TGP4SF00S1M4B4 0~40kPa 1199FFW A50AADL03H00
On behalf of the 3151TGP base table plus an American standard 2”150LB flange type remote transmission device, the capillary length is 3 meters.
3151T flat remote pressure transmitter
The selection is as follows: 3151TGP4SF00S1M4B4 0~40kPa 1199PFWA50AADL03H00
On behalf of the 3151TGP base table plus an American standard 2”150LB flat remote transmission device, the capillary length is 3 meters.
3151T type insert barrel remote pressure transmitter
The selection is as follows: 3151TGP4SF00S1M4B4 0~40kPa 1199EFWA50AABDL03H00
On behalf of the 3151TGP base table plus an American standard 2”150LB plug-in remote transmission device, the capillary length is 3 meters, the insertion barrel length is 100mm.
3151T threaded remote pressure transmitter
The selection is as follows: 3151TGP7SF00S1M4B4 0~1000kPa 1199RTWA1AADL03H00
On behalf of the 3151TGP base table plus a threaded connection remote transmission device, capillary length of 3 meters, user connection thread specifications 1/2NPT-14.
3151T type three clamp type remote pressure transmitter
The selection is as follows: 3151TGP5SF00S1M4B4 0~100kPa 1199SCWA1A0DL03H00
On behalf of the 3151TGP base table plus a three-clamp type remote transmission device, the capillary length is 3 meters, the user connection clamp specification is 1 1/2 inch.
3151GP/DP flange type remote pressure transmitter
The selection is as follows: 3151GP4SF22S1M4B3 0~40kPa 1199FFW A50AADL03H00
On behalf of the 3151GP base table plus an American standard 2”150LB flange type remote transmission device, the capillary length is 3 meters.
3151GP/DP flat remote pressure transmitter
The selection is as follows: 3151GP4SF22S1M4B3 0~40kPa 1199PFWA50AADL03H00
On behalf of the 3151GP base table plus an American standard 2”150LB flat remote transmission device, the capillary length is 3 meters.
3151GP/DP type insert barrel remote pressure transmitter
The selection is as follows: 3151GP4SF22S1M4B3 0~40kPabr> 1199EFWA50AABDL03H00
On behalf of the 3151GP base table plus an American standard 2”150LB plug-in remote transmission device, the capillary length is 3 meters, the insertion barrel length is 100mm.
3151GP/DP type threaded remote pressure transmitter
The selection is as follows: 3151GP7SF22S1M4B3 0~1000kPa 1199RTWA1AADL03H00
On behalf of the 3151GP base table plus a threaded connection remote transmission device, capillary length of 3 meters, user connection thread specifications 1/2NPT-14 specific size,
3151GP/DP type three clamp type remote pressure transmitter
The selection is as follows: 3151TGP5SF22S1M4B3 0~100kPa 1199SCWA1A0DL03H00
On behalf of the 3151GP base table plus a three-clamp type remote transmission device, the capillary length is 3 meters, the user connection clamp specification is 1 1/2 inch.
Diaphragm Seal System
Remote Diaphragm seal pressure transmitter, is the capillary type pressure transmitter. This type pressure transmitter, assembling diaphragm seals to field transmitters for the purpose of measuring pressure, differential pressure, level, and flow.
Basically, diaphragm seals are used in all pressure measurement processes to avoid direct contact between the measuring instrument and the medium during this process. In addition, if the measuring point cannot be installed or read because the measuring point is located in a hard-to-reach location, a diaphragm seal can also be used. In both cases, the applied pressure is transferred to the measuring instrument through the system fill fluid in the diaphragm seal housing. The diaphragm of the seal can be made of different materials, such as stainless steel, Hastelloy, Monel or tantalum. In addition, coatings with ECTFE, PFA or gold can also be used.
We can provide the best diaphragm seal design, materials, system fill fluid and accessories for each application. The combined configuration of the pressure measuring instrument and the diaphragm seal is mainly determined by the special application conditions of the diaphragm sealing system.
How does a diaphragm pressure sensor work?
When the diaphragm seal pressure transmitter is working, the high and low pressure side isolation diaphragms and the filling liquid transfer the process pressure to the center filling liquid. The filling fluid in the center transmits the pressure to the sensing diaphragm in the center of the δ-chamber sensor. The sensing diaphragm is a tensioned elastic element, and its displacement changes with the differential pressure. For GP gauge pressure transmitters, the atmospheric pressure is applied to the low-pressure side of the sensing diaphragm. AP absolute pressure transmitter, the low pressure side always maintains a reference pressure. The maximum displacement of the sensing diaphragm is 0.004 inches (0.10 mm). The displacement is proportional to the pressure. The two capacitance fixed plates of the measuring diaphragm are linearly converted into a 2-wire current, voltage or digital HART output signal of 4-20mADC by the amplifying circuit.
What is a diaphragm seal?
Diaphragm seals, also known as chemical seals or remote seals, are used for pressure measurements when the process medium should not come into contact with the pressurised parts of the measuring instrument.
A diaphragm seal has two primary tasks:
Separation of the measuring instrument from the process medium
Transfer of the pressure to the measuring instrument
The remote seal is used to prevent the medium in the pipeline from directly entering the pressure sensor assembly in the pressure transmitter. It is connected to the transmitter by a capillary filled with fluid. As a result, they’re often used in refining, petrochemical, and chemical plants.
Applicaitons of diaphragm seal
Typical applications where a diaphragm seal provides a cost-effective solution, to protecting the pressure instrument are:
In applications where the process fluid is corrosive;
In applications where the process fluid has a high viscosity, is comprised of slurries, sludge or other material that can actually coat, or damage a traditional pressure measuring device;
In applications where the process fluid can freeze or polymerize, thus causing a condition that might lead to the instrument becoming immobilized, or incapable of transmitting an accurate pressure measurement or signal.
The process side of the seal is isolated by a flexible diaphragm. The internal space between this diaphragm and pressure measuring sensor is filled with a system fill fluid. The pressure is transmitted from the measured medium, by the elastic diaphragm into the fluid. And from there to the measuring element, i.e. to the pressure measuring instrumentor the transmitter.
Often, between the diaphragm seal and pressure measuring instrument, a capillary is connected. Capillary can eliminate or to minimize temperature effects from the hot fluid to the measuring instrument.
A Remote seal is mounted to the process by threaded, flanged, in-line, sanitary, or other connections. Usually, the fittings consist of T-pieces which are integrated into a pipeline, or of welding sockets which are welded to a pipeline, the process reactor or a tank.
This diaphragm seal type offers the advantage, that the “contact surface” between pressure medium and the diaphragm is relatively large. Thus ensuring accurate pressure measurement, especially for very low pressures (< 600 mbar).
Although standard remote seal bodies and diaphragms, are made of stainless steel, a variety of materials, from carbon steel to Hastelloy® C-276, are available to meet the demand of most applications.
A remote seal from Sino-Instrument can operate in pressure applications from 10″ Hg to 20,000 psi, and media temperatures between -130°F and 752°F. We can try to Learn more about the functionality, areas of application and advantages of a diaphragm seal in the following WIKA video.
The electronic watch case can rotate 360 degrees at the maximum. The positioning screw can fix it at any position.
Single-crystal silicon remote flange is connected with the matching flange conforming to ANSI / DIN standard. The matching flange should be equipped with soft gasket and fixed bolts and nuts. The user can choose to install bolts and nuts.
For the remote transmission pressure transmitter with capillary, if the remote transmission sealing device is lower than the transmitter body, the maximum height drop between the remote transmission sealing device and the transmitter body should be less than 5m. When the working pressure is lower than 100kPa absolute pressure, the transmitter body must be lower than the remote transmission sealing device.
The minimum bending radius of the capillary is 75mm, winding is strictly prohibited
Q&A
Parameters that determine the design of a remote seal transmitter
Location of the transmitter (indoor versus outdoor). Temperatures (process and ambient). Exposure to vacuum. Pressure (operating and maximum). Length of capillary. Type of seal desired. Process connection, material of construction and similar considerations. Installation requirements. Measurement span.
When are threaded connections used with diaphragm seals?
The combinations of diaphragm seals with threaded connection can be used for processes with extreme temperatures and with aggressive, adhesive, corrosive, environmentally hazardous or toxic media.
Why are there different system fill fluids with diaphragm seals?
In selecting the system fill fluid for diaphragm seals, factors such as compatibility (physiologically harmless) and also temperature and pressure conditions at the measurement location are of crucial importance. Depending on the system fill fluid, the appropriate minimum and maximum operating temperature range must be observed.
How are the diaphragm seals connected?
The diaphragm seals are available with female or male thread in their basic design. Due to the wide variety of available process connections they can be mounted to many different connections without any problems. Generally these connections are T-pieces which are integrated into a pipeline or welded to a pipeline by means of a welding socket.
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.
The Submersible Level Transmitter is the most commonly used tank level indicator. There are stainless steel probes that are placed at the bottom of tanks, wells, or other liquid containers. Output 4-20mA signal. For liquid level measurement and control.
The difference between the SMT3151TR Hydrostatic Submersible Level Transmitter and other submersible level transmitters is that it is a straight rod insertion type.
Measuring range: select within 0 ～ 5m (more than 5m negotiate order)
Measurement accuracy: 0.5
Output signal: 4 ～ 20mADC; 0 ～ 20mA;
Working temperature: -50 ～ 80 ℃/ -50~450℃ （High temperature type）;
Sino-Inst offers a variety of Hydrostatic Submersible Level Transmitters for flow measurement. If you have any questions, please contact our sales engineers.
Features of Hydrostatic Submersible level transmitter
Solid structure, no moving parts, high reliability and long service life;
From water to sewage, from oil to liquid with high viscosity, high-precision measurement can be carried out, and it is not affected by foaming and sedimentation of the medium;
With multi-purpose mounting bracket, easy to install and use;
Lightning protection design. Has good anti-interference and lightning protection capabilities;
With power reverse polarity protection and overload current limit protection;
The new material is not easy to fatigue and wear, and has strong resistance to vibration, impact and overload]
High temperature type can be customized. High temperature reaches 450 ℃.
Flange: DN32 (HG/T20593,20595-97) RF sealing face ； G2″ thread（customize）
Electrical connection:
M20×1.5
Explosion-proof grade:
Exia II CT6Ga; Exd II CT6Gb
Applications of Submersible Level Transmitter
Sino-Inst’s Hydrostatic Level Transmitter is used in various industrial and municipal environments. Especially in water supply and wastewater treatment plants. Mainly used for water level measurement of urban water supply, oil tanks, petrochemical and other open tanks.
Hydrostatic Level Transmitter measures the hydrostatic pressure of a liquid medium. Liquid level information is transmitted through electrical signals. The signal changes linearly and proportionally. To measure the hydrostatic pressure above the sensor.
The rod type static pressure liquid level transmitter has two standard installation methods of G11 / 2 thread and flange.
Thread installation For the transmitter that is directly installed with G11 / 2 thread, a G11 / 2 round nut is provided at the time of delivery. Generally, there are two ways for installation.
The installation position has G11 / 2 thread. The liquid level transmitter can be screwed in directly. The attached round nut can be used or screwed on to prevent loosening.
There is no G11 / 2 thread in the installation position. Can use the existing Φ50 ~ Φ60 light hole, or install a bracket with Φ50 ~ Φ60 hole. Install the liquid level transmitter, and screw on the round nut to fix it.
Flange mounting The standard installation dimensions of flanges are in accordance with DN50, GB9119.6-88 If there are other flange mounting holes in the installation location, please indicate the flange size or the corresponding specifications and standard numbers when ordering, in order to meet the installation requirements.
Hydrostatic level transmitter is actually a type of pressure transmitter. Hydrostatic level transmitter is the application of pressure transmitter to liquid level measurement. The submersible Hydostatic pressure level transmitter is based on the principle that the measured liquid static pressure is proportional to the height of the liquid. Piezoresistive effect using diffused silicon or ceramic sensitive elements. Convert static pressure into electrical signal. After temperature compensation and linear correction. Convert to 4-20mADC standard current signal output. In order to achieve liquid level measurement.
The basic working principle of Hydrostatic Level Sensor is static pressure level measurement.
In liquid, the pressure generated at a certain depth is generated by the weight of the medium itself above the measurement point. It is proportional to the density of the medium and the local acceleration of gravity.
The formula P = ρgh reflects the proportional relationship between them.
Where P = pressure, ρ = medium density, g = gravity acceleration, h = depth of measurement point.
Therefore, the physical quantity measured by the input liquid level gauge is actually pressure. It can be understood by the calibration unit mH2O of the input level gauge. The actual liquid level must be obtained by conversion after knowing the two parameters of density and gravity acceleration. In the industrial field, such conversion is usually performed by a secondary instrument or PLC.
The Hydrostatic Level Sensor mainly measures corrosive liquids such as hydrochloric acid, hydrogen peroxide, etc. Or chemical and electroplating wastewater. Mainly used in measuring corrosive media. It has the advantages of strong corrosion resistance and stable performance.
Compared with other liquid level transmitters, Hydrostatic level transmitter has lower cost. The price of Hydrostatic level transmitter is mainly affected by the measurement situation. such as:
Range range;
Medium temperature;
The medium is corrosive;
Sino-Inst is a manufacturer of Hydrostatic level transmitter. Sino-Inst provides customers with the best Hydrostatic level transmitter price. For example, the general-purpose Hydrostatic level transmitter has a reference price of USD70. If you want to know the exact price, please contact our sales engineer.
Sino-Instrument offers detailed product specifications and data sheets for review. Our application engineers, can help ensure you choose exactly what you need for your specific installation. Or if you need the RFQ instantly, we can offer you with the submersible level transmitter price immediately.
Magnetostriction means that the change of the magnetization direction in ferromagnetic substance will cause the change of the medium lattice spacing. As a result, the length and volume of the ferromagnetic substance change. Magnetostrictive level transmitter is a level transmitter based on the principle of magnetostriction. It is a high-precision, high-resolution transmitter driven by a magnetic float.
Ultrasonic Level Indicator, also called Ultrasonic level sensor, or ultrasonic level transmitter. In this type of transmitter, an ultrasonic transducer is mounted at, or near the top of a container containing liquid. The transducer sends out an ultrasonic pulse. The pulse hits the surface of the liquid, and gets reflected. The sensor then calculates the fill level based on the time between the transmitted and received signal.
Sino-Inst offers over 10 Submersible Level Transmitters. About 50% of these are Submersible Level Sensors, 40% are water level meters, and 40% are for tank level. A wide variety of Hydrostatic Level Sensor options are available to you, such as free samples, paid samples.
Sino-Inst is a globally recognized supplier and manufacturer of Hydrostatic level transmitter. Submersible Level Transmitter instrumentation, located in China.
Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Submersible Level Transmitterproducts 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.Send RFQ NOW, You may get the price now.
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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.
Hydrostatic Pressure Transmitters is an instrument that measures the hydrostatic pressure or differential pressure exerted by a hydrostatic head.
Feel the measured pressure through the remote transmission device installed on the pipeline or container. The pressure is transmitted to the main body of the transmitter through the filling silicone oil (or other liquid) in the capillary tube. Then there is the delta chamber and the amplifier circuit board in the main body of the transmitter. Convert into 4-20mA DC signal output. HP Smart can communicate with a HART handheld communicator. Use it to set, monitor, or form an on-site monitoring system with the host computer.
The Hydrostatic pressure transmitter is used to measure the liquid level, flow, and pressure of the liquid, gas or steam under high working pressure, and then convert to 4~20mA DC signal output.
The high hydrostatic pressure transmitter can measure differential pressure below 32MPa hydrostatic pressure.
With 32MPa working pressure and overload protection.
Ensuring reliable application of the transmitter in Hydrostatic pressure systems.
Precipitating medium with solid particles or suspended matter
Strong corrosive or highly toxic medium
It can eliminate the phenomenon that the pressure guiding tube leaks and pollutes the surrounding environment. It can avoid the instability of the measurement signal when the isolation fluid is used. The tedious work of frequently supplementing the isolation fluid is required.
Continuous and accurate measurement of interface and density
The remote transmission device can avoid the mixing of different instantaneous media. So that the measurement result truly reflects the actual situation of the process change.
Occasions requiring high hygiene and cleanliness
For example, in the production of food, beverage and pharmaceutical industries, it is not only required that the parts of the transmitter contacting the medium meet the hygienic standards. It should also be easy to wash. To prevent cross-contamination of different batches of media.
Hydrostatic pressure is the pressure generated by the weight of the liquid above the measurement point when the liquid is stationary. The height of the liquid column with uniform density is proportional to the hydrostatic pressure. As the weight of the fluid exerting downward force from above increases, the hydrostatic pressure increases in proportion to the depth measured from the surface.
If the fluid is inside the container, the depth of the object placed in the fluid can be measured. The hydrostatic characteristics of a liquid are not constant, and the main factors affecting it are the density and local gravity of the liquid. In order to determine the hydrostatic pressure of a particular liquid, both quantities need to be known.
The deeper an object is placed in a fluid, the greater the pressure it bears. This is because the weight of the fluid is higher than its weight. Due to the weight of the fluid, the denser the fluid above it, the greater the pressure on the submerged object.
Measuring principle
The pressure in the liquid increases as the filling height increases. The hydrostatic pressure is transmitted to the measuring unit through the stainless steel diaphragm. Bubbling, accumulation of liquids, fluctuating electrical characteristics, and container design will not affect the measured value.
The formula for calculating the hydrostatic pressure of a column of liquid is:
Phyd = h.ρ.g
Prel = h.ρ.g
Pabs = h.ρ.g + Patm
Phyd = Hydrostatic Pressure (Pa) Prel = Relative Pressure (Pa) Pabs = Absolute Pressure (Pa) Patm = Atmospheric Pressure (Pa) h = Liquid Height (m) ρ = Liquid Density (kg/m3) g = Local Gravity (m/s2)
The above calculation formula is also the working principle of hydrostatic liquid level sensor.
The hydrostatic pressure sensor measures the hydrostatic pressure applied by the hydrostatic head. Output 4-20mA. Use a hydrostatic pressure transmitter to measure the storage tank and pump inlet. And other applications where hydrostatic pressure is used to determine the liquid level.
Hydrostatic Pressure Sensor/Transmitter can also be used with paperless recorder.
In liquid, the pressure generated at a certain depth is generated by the weight of the medium itself above the measurement point. It is proportional to the density of the medium and the local acceleration of gravity.
The formula P = ρgh reflects the proportional relationship between them.
Where P = pressure, ρ = medium density, g = gravity acceleration, h = depth of measurement point.
Therefore, the physical quantity measured by the input liquid level gauge is actually pressure. It can be understood by the calibration unit mH2O of the input level gauge. The actual liquid level must be obtained by conversion after knowing the two parameters of density and gravity acceleration. In the industrial field, such conversion is usually performed by a secondary instrument or PLC.
The Hydrostatic Level Sensor mainly measures corrosive liquids such as hydrochloric acid, hydrogen peroxide, etc. Or chemical and electroplating wastewater. Mainly used in measuring corrosive media. It has the advantages of strong corrosion resistance and stable performance.
There are various methods and techniques for measuring fluid level using hydrostatic pressure sensors. Depending on the installation, they all have advantages and disadvantages. Hydrostatic pressure measurement is an accurate and convenient technique for determining fluid height or volume.
Let’s take a look at each according to the installation location of the hydrostatic pressure sensor.
The Hydrostatic pressure liquid level sensor can be installed to the outside of the container through threads or flange fittings. If necessary, capillaries can also be used.
Submersible type
Picture source: network picture
If the externally mounted sensor is not available, a submersible pressure sensor can be used. The electrical connection with IP68 rating is suitable for long-term permanent immersion. The electronic equipment of the sensor can be protected from the external environment.
DP transmitters are Differential Pressure Transmitters. DP transmitter measures the pressure difference between the gas or liquid at both ends of the transmitter. Output 4~20mA, 0~5V. Used for liquid level, density, and pressure of liquid, gas, and steam.
DP transmitters are different from pressure transmitters as they have 2 pressure interfaces. With flanges, capillaries, valves, brackets, throttle devices. Differential pressure transmitters are used to measure the level, density, and flow of liquids, gases, and vapors. Then convert it into 4–20mADC current signal output.
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.
How to debug the fault of Hydrostatic pressure transmitter
Total Time:30 minutes
Check the power supply
Check if the power supply of the differential pressure transmitter is reversed, and whether the positive, and negative poles of the power supply are connected correctly.
Measure the power supply
Measure the power supply of the transmitter, whether there is 24V DC voltage. It must ensure that the power supply voltage to the transmitter is ≥12V (that is, the voltage of the transmitter power input terminal is ≥12V). If there is no power supply, check whether the circuit is disconnected, whether the instrument is selected incorrectly (input impedance should be ≤250Ω), and so on.
Check the display meter
If the pressure transmitter is equipped with a meter head, it is necessary to check whether the dislay meter is damaged. You can short-circuit the two wires of the meter head first. If it is normal after a short circuited, it means the head is damaged. If the meter head is damaged, Then you need to change the header.
Check the current
If there is a problem with the differential pressure transmitter, connect the ammeter to the 24V power supply circuit to check if the current is normal. If it is normal, the transmitter is normal. In this case, check if other instruments in the loop are normal.
Connect the power supply
Connect the power supply to the transmitter power input terminal, and connect the power cable to the power supply wiring port. If you still have any question with the selection, application, and use of pressure transmitters, you can just contact our engineer today.
Cryogenic pressure transducer for low temperature pressure measurement. -196℃～+125℃、-260℃/-350c（especial）. Sino-Inst offers a variety of Pressure Sensors for pressure measure and…
Hydrostatic pressure transmitter/sensor measures the level, density, and pressure of liquid, gas, or steam. And then converts it into a 4-20 mA DC signal output. The Hydrostatic pressure transmitter can communicate with the HART communicator intelligently. Use it to set, monitor or form a site monitoring system with the host computer. Use a Hydrostatic pressure sensor to measure tanks, processing vessels, headers, pump inlets and others using hydrostatic pressure to determine the liquid height. SI3051HP Hydrostatic pressure transmitters, with working Hydrostatic pressure up to 32Mpa.
Sino-Inst offers a variety of Hydrostatic Pressure Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.
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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.
OEM Pressure Sensor is an economical product. It uses all stainless steel wetted parts, has a compact size and high cost performance.
This pressure transmitter measures gauge pressure and absolute pressure. The measurement system is fully welded and can be used for most liquid and gas media. This series provides a variety of electrical outputs as well as electrical connections and pressure interfaces to meet most application requirements. The compact structure is very suitable for installation in a small space.
Sino-Inst offers a variety of OEM pressure senors for industrial pressure measurement. If you have any questions, please contact our sales engineers.
Piezoelectric effect is the main working principle of piezoelectric sensors. Piezoelectric sensors cannot be used for static measurement. Because the charge after external force is applied, it can only be saved when the loop has infinite input impedance. This is not the case, so this determines that piezoelectric sensors can only measure dynamic stress.
Ceramic pressure sensor:
Ceramic pressure sensors are based on the piezoresistive effect. Pressure directly acts on the front surface of the ceramic diaphragm, causing the membrane to deform slightly. Thick film resistors are printed on the back of the ceramic diaphragm and connected into a Wheatstone bridge. Because of the varistor The piezoresistive effect makes the bridge generate a voltage signal that is highly linear and proportional to the pressure and proportional to the excitation voltage. The standard signal is calibrated to 2.0 / 3.0 / 3.3mv / v according to different pressure ranges. Strain sensors are compatible.
Diffused silicon pressure sensor:
The working principle of a diffused silicon pressure sensor is also based on the piezoresistive effect. Using the piezoresistive effect principle, the pressure of the measured medium directly acts on the diaphragm of the sensor (stainless steel or ceramic). The diaphragm produces a micro-displacement proportional to the pressure of the medium. Change the resistance value of the sensor. Use electronic circuits to detect this change, and convert and output a standard measurement signal corresponding to this pressure.
Sapphire pressure sensor:
Utilizing strain-resistance working principle. Using silicon-sapphire as the semiconductor sensitive element has unparalleled metrological characteristics. Therefore, silicon-sapphire semiconductor sensitive components are used. They are not sensitive to temperature changes and have good working characteristics even under high temperature conditions. Sapphire has extremely strong radiation resistance. In addition, silicon-sapphire semiconductor sensitive components, pn drift.
Piezoresistive force sensor:
Resistance strain gage is one of the main components of a piezoresistive strain sensor. The working principle of a metal resistance strain gage is that the resistance of the strain resistance absorbed by the base material changes with the mechanical deformation.
Applications of OEM pressure sensor
Industrial process control: liquid level measurement, gas, liquid pressure measurement;
Pressure testing instruments: pressure calibration instruments, hydraulic systems and switches; refrigeration equipment and air conditioning systems, aviation and marine testing.
Sino-Inst sensors are produced in three basic configurations: gauge pressure sensors, absolute pressure sensors and sealed gauge pressure sensors.
A large percentage of OEM pressure sensors produced by Sino-Instrument, are used in our own pressure transducers, and pressure transmitters, so Sino-Inst understands the OEM viewpoint.
Whatever the need, Sino-Inst can provide the solution!
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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.
Absolute pressure transmitters measure the absolute pressure of the medium in the equipment. Its reference pressure is the absolute value 0 (vacuum), which has nothing to do with atmospheric pressure. Therefore, there is a vacuum sealed chamber on the low-pressure side of the pressure core.
When the fluctuation amplitude of the actual atmospheric pressure affects the process parameters beyond the allowable range, the use of absolute pressure transmitters is necessary. For example, in places where the local average atmospheric pressure deviates greatly from the standard atmospheric pressure.
Sino-Inst offers a variety of pressure senors for industrial pressure measurement. If you have any questions, please contact our sales engineers.
4~20mAdc. output, superimposed HART protocol digital signal (two-wire system)
Power supply:
External power supply 24Vdc., power supply range 12V~45V
Hazardous location installation:
Explosion-proof type ExdIIBT5Gb; Intrinsically safe type ExialCT.4/T5/T6Ga;
Migration characteristics:
At the minimum range (range compression ratio is 40:1), the maximum positive migration zero point is 39/40 times the upper limit of the range. The maximum negative migration zero point can be the lower limit of the range. The absolute pressure transmitter has no negative migration. (No matter what the output form is, after the positive and negative migration, the upper and lower limits of the range shall not exceed the range limit)
Temperature range:
The electronic circuit board works at -40~85℃; the sensitive element works at -40~104℃; the storage temperature works at -40~85℃: with digital display works at -25~75℃ (operation); -40~85℃ (no damage)
Relative humidity:
0~95%
Overpressure limit:
Range 3 to 8 withstand 0 (absolute pressure) ~13.78MPa, pressure transmitter without damage; range 9 pressure does not exceed 31.29MPa; range 0 pressure does not exceed 51.4MPa: normal working pressure is 3.43kPa (absolute pressure) to the upper limit of the range.
Volume change:
Less than 0.16cm3
Damping:
The time constant is adjustable between 0.2~32.0s.
Accuracy:
±0.1%, ±0.075%
Stability:
±0.1% of the maximum range/12 months
Temperature effect:
The temperature error including zero point and range is ±0.2% of the maximum range/20℃
Power supply effect:
Less than 0.005%/V of the output range.
Vibration effect:
In any axis, the frequency is 200Hz, and the error is ±0.05%/g of the maximum range.
Load effect:
As long as the voltage of the input transmitter is higher than 12V, there is no load influence in the load working area.
Installation position effect:
The maximum zero position error that can be generated is no more than 0.2kP, which can be eliminated by correction without affecting the range; the rotation of the measuring body relative to the flange has no effect.
Note: Under no migration, 316 stainless steel isolation diaphragm and other standard test conditions.
Order Guide
Model
Transmitter type
GP
Pressure transmitter
AP
Absolute pressure transmitter
Code
Scale range
2
0-0.10～3.5kPa(0-10～350mmH2O)
3
0-0.8～8.0kPa(0-80～800mmH2O)
4
0-4.0～40kPa(0-400～4000mmH2O)
5
0-20～200kPa(0-2000～20000mmH2O)
6
0-70～700kPa(0-0.7～7kgf/cm2)
7
0-210～2100kPa(0-2.1～21kgf/cm2)
8
0-700～7000kPa(0-7.0～70kgf/cm2)
9
0-2.1～21MPa(0-21～210kgf/cm2)
0
0-4.1～41MPa(0-41～4100kgf/cm2)
Code
Output form
E
Linear output 4-20mAdc
SF
Linear output 4-20mAdc+HART signal，Full function buttons on site
The pressure expressed with complete vacuum as the zero standard is called absolute pressure. Absolute pressure has only positive values.
What is absolute pressure transmitter?
Absolute pressure (AP) transmitter measure relative to perfect (full) vacuum pressure (absolute zero pressure).
Therefore, AP transmitters are not affected by fluctuations in the local atmosphere.
All absolute pressure measurements are positive. The letter ‘a’ or the abbreviation ‘abs’ in the unit of measure (i.e., inH₂O(abs) or psia) indicates an absolute pressure measurement.
Any critical storage and delivery (toxic gases) will change due to atmospheric conditions. So these systems must be accurate and use static references.
Absolute pressure transmitters are used in applications where the pressure of a gas or liquid is isolated from changes in atmosphere. For example, when testing a sealed pressure vessel for leaks for a long time.
How do absolute pressure sensors work?
The absolute pressure transmitter is mainly composed of two parts. One part is directly connected to the side to be measured. The other side is designed as an absolute vacuum reference chamber. This makes the two compartments form Absolute pressure. When the pressure on both sides is inconsistent, the difference signal will be transmitted through a special transmission line. The computer system in the background can calculate the difference. The pressure value on the measured side is directly displayed.
Applications for Absolute Pressure Sensors
Absolute pressure sensors and absolute pressure gauges are often used for industrial high-performance vacuum pumps that need to be monitored.
It is used to vacuum pack medical products in a clean environment. To ensure hygienic and sterile delivery to hospitals and doctors.
In the food industry, vacuum packaging can be used when the highest possible vacuum is required to prevent oxygen from deteriorating perishable foods. This greatly extends the flavor and shelf life of the product.
In meat packaging, a vacuum that meets the requirements must be generated. This can safely guarantee the longest shelf life.
And pressure sensors affected by the atmosphere cannot monitor the high end of the vacuum.
Applications that require true absolute pressure sensors and instruments can also be found in scientific laboratories, universities, military and aerospace industries.
Sino-Inst supplies Direct Mount Pressure / Absolute Pressure Transmitter.
SMT3151 Absolute Pressure Transmitter
SM3151 TAP Pressure-absolute pressure transmitter shape and installation dimensions
Absolute pressure transmitter calibration
First make a 4-20mA fine adjustment. It is used to calibrate the D / A converter inside the transmitter. Because it does not involve sensing components, no external pressure signal source is required.
Finally, re-quantify the range. By adjusting the analog output 4-20mA and the external pressure signal source. Its function is exactly the same as the zero (Z) and range (R) switches on the transmitter shell.
Absolute pressure transmitter VS Gauge pressure transmitter
Absolute pressure transmitter
Absolute pressure transmitter can realize absolute pressure measurement in equipment such as degassing system, distillation tower, evaporator and crystallizer, and allows pressure under 10Mpa. The δ chamber side of the absolute pressure transmitter receives the measured absolute pressure signal. The other side is sealed into a high vacuum reference chamber. Then convert it into 4 ~ 20mA DC signal output.
A gauge pressure transmitter in the general sense is mainly composed of a load cell sensor (also called a pressure sensor), a measurement circuit and a process connection. It can convert the physical pressure parameters such as gas and liquid felt by the load cell sensor into standard electrical signals (such as 4 ~ 20mADC, etc.), and provide secondary indicators such as alarm indicators, recorders, and regulators for measurement and indication. And process regulation.
More Featured Pressure Transmitters and Pressure Measurement Solutions
Sino-Inst is Chinese manufacturer of absolute pressure transmitters. SMT3151AP absolute pressure transmitters, are our main products, which are widely used in USA, South Africa, and other countries.
Contact us any time, if you need the quotation or technical support.
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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.
High Temperature Pressure Transducer is specially used for high temperature medium pressure measurement. Such as high temperature liquid, gas, steam, etc. The highest temperature is customized to 850℃.
High temperature resistant pressure sensor is selected as the signal measurement element. The transmitter structure includes a heat dissipation structure, and the high-precision signal processing circuit is located in the stainless steel housing. The sensor output signal is converted into a standard output signal, such as 4-20mA.
Sino-Inst is a manufacturer of high temperature pressure transducer in China. Committed to the manufacture, sales and engineering support of high temperature pressure sensors.
Features of SI-2088 High Temperature Pressure Transducer
Working temperature –55 …850 ° C, customizable;
Pressure range can also be customized, such as 150MPa high pressure;
The sensor and pressure interface are fully welded structures, and the housing protection level is IP65;
The material in contact with the medium is stainless steel, which has good corrosion resistance;
It is suitable for pressure measurement of high temperature, low temperature and normal temperature media, and can work stably for a long time;
It is impact-resistant, vibration-resistant and corrosion-resistant;
High temperature pressure transducer for measuring lowest pressure fluctuations in a harsh environment up to 850 ° C. For applications in hazardous areas, the sensor is available with intrinsically safe Ex-ia and non-incendive Ex-nA certifications.
Specifications of High Temperature Transducer
Range:
0 ～ 1KPa ～ 10KPa ～ 400KPa, -0.1 ～ 0 ～ 1 ～ 60 (MPa), 0 ～ 10KPa ~ 100MPa, Other pressure ranges can be customized.
SI2088 High Temperature Pressure Transducer used in the fields of steam, oil, boiler and heat energy exchange. Realize the measurement of liquid, gas and vapor pressure.
Application of high temperature pressure transmitter in steam pipeline
Pure steam pipes have good mechanical properties and thermal insulation properties. Under normal circumstances, it can withstand a high temperature of 120 ° C. It can withstand a high temperature of 180 ° C by modification or in combination with other thermal insulation materials.
It is suitable for thermal insulation of various cold and hot water high and low temperature pipelines. The pressure detection in the steam pipeline is very important. And because of the high temperature characteristics in the pipeline. Therefore, it is suitable to use the high temperature pressure transmitter designed by our company for such occasions.
In addition, in the steam system, water hammer (Water Hammer) is one of the main hazards causing casualties. Thereby eliminating the hazard of water hammer. This shows that daily pressure monitoring of the pipeline is very important.
Precautions for the correct use of steam pressure transmitters
1. Prevent the steam pressure transmitter from contacting with corrosive or overheated media; 2. Prevent dross from depositing in the conduit; 3. When measuring gas pressure, the pressure port should be opened at the top of the pipeline, and the pressure transmitter should also be installed at the top of the pipeline, so that the accumulated liquid can be easily injected into the process pipeline; 4. The pressure guiding pipe should be installed in a place with small temperature fluctuation; 5. When measuring steam or other high-temperature media, a condenser such as a buffer tube (coil) should be connected, and the working temperature of the transmitter should not exceed the limit; 6. When freezing occurs in winter, the transmitter installed outdoors must take anti-freezing measures to avoid the expansion of the liquid in the pressure port due to the frozen volume, resulting in the loss of the sensor; 7. When wiring, pass the cable through the waterproof connector or the flexible tube and tighten the sealing nut to prevent the rainwater etc. from leaking into the transmitter housing through the cable.
High Temperature Pressure Transducers vs. Cooling Elements
Generally, the design method is to reduce the temperature near the pressure transmitter by incorporating mechanical cooling components to dissipate heat.
The cooling assembly may be filled with oil and isolated from the process medium by the isolation diaphragm.
Alternatively, the cooling assembly may include a hollow tube. The shape of the hollow tube is designed to increase heat transfer. This allows the process medium that is allowed to pass to be lowered to a much lower temperature.
The cooling element usually relies on the principle of convection heat transfer. This convective heat transfer principle is a mechanism for transferring heat due to the movement of fluid. In contrast, conductive heat transfer is the transfer of energy due to molecular vibration. In addition to cooling elements, convection is also used in many other engineering practices.
The cooling element may be able to reduce the temperature of the medium. This is usually a much cheaper solution than high temperature sensors. It is assumed that the medium density is not greatly affected by temperature changes within the normal operating range. Then this method can keep the pressure unchanged.
The cooling element usually works in air and water, but it is not suitable for oily media such as hydraulic oil. High temperature sensors must be used in these applications because the viscosity of this medium is highly temperature dependent.
The cooling element should be made of stainless steel so that most process media have maximum corrosion resistance. The nickel content of the steel is usually 1.25% and the chromium content is 0.65% to 0.8%.
The cooling element should withstand a maximum pressure of 5,000 psi at 38 ° C (100.4 ° F) and a maximum pressure of 3500 psi at 400 ° C (752 ° F). It also reduces the liquid process temperature at the sensing element from 260 to 38 ° C (500 to 100.4 ° F).
600 ℃ High Temperature Remote Pressure transmitter / Differential Pressure Transmitter
Greatly expanded the application range of ultra-high temperature pressure / differential pressure measurement. It can be widely used in coal chemical industry and CSP industry.
How to Select a Pressure Transducer For High Temperature Medium
Define your high temperature pressure transmitter requirements using this checklist:
Sino-Inst produces and supplies pressure transmitters that meet various extreme temperature conditions. In addition to customizing high temperature pressure transmitters, we can also customize ultra-low temperature pressure transmitters, ultra-high pressure pressure transmitters, etc.
Our high temperature pressure transmitters are suitable for high temperature applications such as steam, food processing and engine monitoring. We widely serve users in various countries and industries.
If you have a special request, you can just contact us for Technical Support.
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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.
A Silicon Pressure Sensor is a pressure transmitter widely used in industry. It uses diffused silicon or ceramic piezoresistive sensors as pressure detection elements. It has strong overload capacity, good stability, and strong anti-interference ability. It has extremely high accuracy and repeatability, and the measurement interface has good corrosion resistance.
Silicon Pressure Sensor has a large signal output. It provides great advantages for the back-end transmission and conditioning circuit. It has high resolution and high sensitivity.
It can be compensated twice. The sensitivity temperature coefficient and zero temperature coefficient of Silicon Pressure Sensor can be compensated. Even the finished core can be compensated twice.
Silicon Pressure Sensors are relatively cheap and cost-effective.
The Silicon Pressure Sensor is small and easy to install. It can be installed and used in narrow locations.
316L stainless steel mechatronic structure with good durability.
Integrated dedicated chip, few discrete components, good temperature characteristics.
(4～20)mA+HART protocol（Current two-wire/three-wire, HART protocol）, etc.
Temperature Range
-30℃~160-350℃, Customized up to -300~850℃
Temperature Effects
0.00015%FS/℃
Pressure Connection
G1/2 female or user specified
Electrical Connection
Waterproof Connector(M20*1.5)
Protection Class
IP65
Silicon Pressure Sensor Applications
Silicon Pressure Sensor Mainly used to measure the pressure of gas, liquid and other objects. The parameters are then converted into standard telecom signals.
Petroleum/Petrochemical/Chemical Matched with the throttling device, it provides accurate flow measurement and control. Measures pressure and level in pipes and tanks.
Electricity/city gas/other company business Places such as measurement require high stability and high precision.
Pulp and paper It is used in places requiring chemical resistance, corrosion resistance, etc.
Steel/non-ferrous metals/ceramics It is used for furnace pressure measurement and other places requiring high stability and high precision measurement. For use where stable measurements are required under strictly controlled (temperature, humidity, etc.) conditions.
Machinery/Shipbuilding It is used in places where stable measurement is required under high-precision conditions such as strict control of temperature and humidity.
There are many types of pressure sensors. Such as resistance strain gauge pressure sensor. Semiconductor strain gauge pressure sensor. Piezoresistive pressure sensor. Inductive pressure sensor. Capacitive pressure sensor. Resonant pressure sensor, etc.
At present, the widely used pressure sensors include: diffused silicon piezoresistive pressure sensors, ceramic piezoresistive pressure sensors, sputtering film pressure sensors, capacitive pressure sensors, and sapphire pressure sensors with high temperature resistance.
But the most widely used is the piezoresistive pressure sensor, which has extremely low price, high precision and good linearity.
When the semiconductor silicon material is subjected to force, the atomic lattice changes. That is, the spacing of the lattice changes. Then the carrier mobility of the silicon material changes. changes, and the concentration changes. The lateral distribution structure and longitudinal distribution of carriers are disturbed. The distribution structure of the material eventually leads to a change in the resistivity of the material. The above is half of the A detailed elaboration of the piezoresistive effect of conductor silicon materials.
A pressure sensor that is also widely used, that is, a resistance strain sensor. Compared with a piezoresistive pressure sensor, the working process or working principle between the two is essentially different.
Piezoresistive Effect of Semiconductor Silicon Piezoresistive Pressure Sensor and Strain Effect of Metal Strain Gauge The difference between the two should be: the output power of the former, that is, the change of the resistance value mainly depends on the material. The change of the resistivity of the material. The output power of the latter, that is, the change of the resistance value depends on Changes in material geometry (strain.
The sensitivity of semiconductor silicon material is high, and its sensitivity is 50 to 100 times that of metal strain gauges.
In 1954, Smith devoted himself to researching the piezoresistive effect of semiconductor silicon material. At the same time, he used it to make pressure sensors.
The silicon pressure sensor researched in the early stage is similar to the semiconductor strain gauge. After development and research, the N-type silicon wafer is doped with P-type impurities by diffusion or ion implantation. The resistance bar is customized. It is matched behind the resistance bar Connect a suitable bridge circuit to make an integrated chip.
It is the same as the use of resistance strain gauges. The chip cannot be used independently to complete the measurement work. It also needs to be firmly attached to the elastic element to sense the change in the measured pressure.
Diffused silicon piezoresistive pressure sensor refers to a sensor made by using the above-mentioned chip as a sensitive element.
The piezoresistive chip of the piezoresistive pressure sensor is packaged in a shell, and the periphery is fixed to form a silicon cup structure.
On the circular silicon diaphragm, four resistance strips with equal resistance value are made by the above-mentioned diffusion or ion implantation doping method.
Put two of them in the range of compressive stress. The other two are fixed in the range of tensile stress. Together they form a Wheatstone bridge measurement circuit.
Resistor strips are drawn from the bridge power supply terminal and output terminal.
The above-mentioned structure is packaged by the manufacturing method of an integrated circuit to obtain a diffused silicon piezoresistive pressure sensor.
Capacitive pressure sensor is a pressure sensor that uses capacitive sensitive 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 z 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. The output can be in a certain relationship with the voltage by measuring the circuit. electrical signal.
Capacitive pressure sensors belong to the polar distance variable capacitive sensors. They can be divided into single capacitive pressure sensors and differential capacitive pressure sensors
Current MEMS pressure sensors include silicon piezoresistive pressure sensors and silicon capacitive pressure sensors. Both are microelectromechanical sensors produced on silicon wafers.
The silicon piezoresistive pressure sensor uses high-precision semiconductor resistance strain gauges to form a Wheatstone bridge as a force-electricity conversion measurement circuit. It has high measurement accuracy, low power consumption and extremely low cost. Piezoresistive sensor for a Wheatstone bridge. If there is no pressure change, its output is zero and almost no power consumption.
Capacitive pressure sensors use MEMS technology to create a grid-like shape on a silicon wafer. The upper and lower two transverse barriers become a group of capacitive pressure sensors. The upper transverse grille is displaced downward by pressure. Changed the spacing between the upper and lower transverse grids. It also changes the size of the capacitance between the plates, that is, △ pressure = △ capacitance.
Sino-Inst offers over 20 Silicon Pressure Sensors. A wide variety of Silicon Pressure Sensors options are available to you. Such as free samples, paid samples. Sino-Instrument is a globally recognized manufacturer of Silicon Pressure Sensors, located in China.
Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Silicon Pressure Sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.
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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.
Gauge Pressure Transmitter/Transducer is a commonly used pressure measurement process instrument in industry. The gauge pressure transmitter measures the pressure signal at the reference end of atmospheric pressure.
An industrial gauge pressure transmitter is commonly used to monitor the process pressure of liquid, gas, steam, etc.
Sino-Inst offers a variety of Gauge pressure transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.
High accuracy: The pressure transmitter can perform high-accuracy measurements within the measurement range of 0~60MPa.
Excellent overpressure performance: Can withstand 2 times the pressure range.
Intelligent static pressure compensation and temperature compensation protect the transmitter from the influence of temperature, static pressure and overpressure, reducing errors.
LCD digital display with backlight
Built-in three-button quick operation and local adjustment function
Various anti-corrosion materials are available
Multi-faceted self-diagnosis function
Optional signals 0-10V, 4-20mA, RS485, HART protocol, etc.
Common Industrial Applications of Gauge Pressure Transmitter
Gauge pressure transmitter is the most commonly used detection instrument in industrial process control, which is widely used in various automatic control systems. Such as aerospace, military industry, petrochemical, chemical industry, oil well, electricity, shipbuilding, building materials, pipelines and many other industries.
It is generally used to measure pressure or absolute pressure in environments where the medium temperature is not too high, the corrosiveness is not strong, the viscosity is not high, and it is not easy to crystallize.
If low temperature, high temperature, corrosive medium measurement is required. Please contact our engineers for customization!
SMT3151 TGP-Gauge Pressure Transmitter / Transducer is a diffusion silicon pressure transmitter. The working principle of the diffused silicon pressure sensor is based on the piezoresistive effect.
Using the principle of piezoresistive effect, the pressure of the measured medium directly acts on the diaphragm of the sensor (stainless steel or ceramic).
Make the diaphragm produce a slight displacement proportional to the pressure of the medium. To change the resistance value of the sensor. Use electronic circuits to detect this change. And convert and output a standard measurement signal corresponding to this pressure.
Difference between absolute, gauge, and differential pressure
Comparison of absolute, gauge and differential pressure
Absolute pressure
Absolute pressure is referred to as the vacuum of free space (zero pressure). In practice, absolute piezoresistive pressure sensors, measure the pressure relative to a high vacuum reference, sealed behind its sensing diaphragm.
The vacuum has to be negligible compared to the pressure to be measured. Sino-Instrument’s absolute pressure sensors, offer ranges from 1 bar or even 700 mbar as well as barometric pressure ranges.
Gauge pressure
Gauge pressure is measured relative to the ambient atmospheric. The average atmospheric at sea level is 1013.25 mbar. Changes of the atmospheric, due to weather conditions, or altitude influences the output of a gauge pressure sensor.
A gauge pressure higher than ambient pressure is referred to as positive pressure. If the measured pressure is below atmospheric, it is called negative or vacuum gauge pressure. In general, a vacuum is a volume of space that is essentially empty of matter.
According to its quality vacuum is divided into different ranges such as an e.g. low, high and ultra high vacuum.
Differential pressure
Differential pressure is the difference between any two process pressures p1 and p2. Differential pressure sensors must offer two separate pressure ports, with a tube or thread. Sino-Instrument’s amplified pressure sensors, are able to measure positive and negative pressure differences. i.e. p1>p2 and p1<p2.
These sensors are called bidirectional differential pressure sensors, with ranges of e.g. -1…+1.0 bar or -2.5…+2.5 mbar. In contrast, unidirectional differential pressure sensor only operate in the positive range (p1>p2). E.g. from 0…1.0 bar or 0…2.5 mbar. And the higher has to be applied to the pressure port defined as “high pressure”.
Gauge Pressure VS Absolute Pressure
Gauge pressure refers to pipeline pressure. It refers to the pressure measured with pressure gauges, vacuum gauges, U-shaped tubes and other instruments, also called relative pressure). “Gauge pressure” starts from atmospheric pressure.
The pressure directly acting on the surface of the container or object is called “absolute pressure”. The absolute pressure value starts with absolute vacuum. Absolute pressure actually refers to the gauge pressure plus the local atmospheric pressure (generally a standard atmospheric pressure can be 101.3Kpa).
Absolute pressure = gauge pressure + one atmosphere If the unit is MPa, absolute pressure = gauge pressure + 0.1MPa
Transmitters can convert physical signals into electrical signals. For example, our pressure transmitter can convert pressure signals into 4-20mA. Liquid level transmitter can convert liquid level signals into 4-20mA.
Gauges are generally mechanical. There is no output of electrical signals. For example, pressure gauges and liquid level gauges. The measurement results can be measured and read intuitively.
When selecting a pressure transmitter, the concept of pressure type is involved: absolute pressure, gauge pressure, negative pressure and differential pressure.
Absolute pressure transmitter measures the absolute pressure of the medium in the equipment. Its reference pressure is an absolute value of 0. It has nothing to do with atmospheric pressure. Therefore, there will be a vacuum sealed cavity on the low-pressure side of the pressure core.
Gauge pressure transmitter measures the pressure based on atmospheric pressure. One side of the pressure transmitter is connected to the atmosphere, and the other side is connected to the measured pressure, so the reference pressure side is open to the atmosphere. It is generally used to measure the liquid level of pipelines and non-pressure tanks.
If you pay close attention to the outer shell of some gauge pressure transmitters, it is not difficult to find some small holes on it. These vents are reserved to keep the reference side connected to the atmosphere.
More Featured Pressure Transmitters and Pressure Measurement Solutions
We at Sino-Inst manufacture and supply various types of gauge pressure transmitters for various industries. Customized production is available based on your measurement requirements, including pressure range, temperature, accuracy, signal output, mounting thread, material, etc.
If you need to purchase a gauge pressure transmitter, or have any technical questions, please feel free to contact us.
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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.
