Diaphragm Seal Pressure Transmitters work with Diaphragm Seals for those harsh working conditions. The purpose of the diaphragm seal is to isolate the pressure sensor from the process medium.
The diaphragm seal makes measuring pressure safer and more reliable. It is ideal for protecting pressure process transmitters even under harsh working conditions. The diaphragm seal can isolate the pressure sensor from the process medium. No matter absolute pressure or differential pressure measurement. Mounting with capillary and flange, Diaphragm Seal pressure transmitter can measure pressure, liquid level and flow.When the environment is extremely hot or cold, or when the process connection is difficult to connect to the measuring instrument. When the measured medium is corrosive, sticky, sticky or easily cured. Or when the process is not chemically compatible with the instrument material. It is recommended to use a diaphragm seal.
Sino-Inst offers a variety of Diaphragm Seal Pressure Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.
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
Diaphragm seals offer the advantage that the “contact surface” between pressure medium and diaphragm is relatively large. Thus ensuring accurate pressure measurement, especially for very low pressures (< 600 mbar). Furthermore, they can be easily dismounted, e.g. for cleaning or calibration purposes.
Rosemount 1199
Rosemount 1199 remote transmission diaphragm system provides the world’s most extensive product variety and specifications to meet the requirements of various measurements and applications.
There are the following types of remote transmission differential pressure / level transmitters: 1) PFW flat type remote transmission device 2) RTW thread installation type remote transmission device 3) EFW inserted barrel remote transmission device 4) RFW flange mounted remote transmission device 5) SCW hygienic remote transmission device
The 1199 remote diaphragm can be assembled to Sino-Inst differential, gauge, and absolute pressure transmitters and liquid level transmitters.
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.
It is mainly composed of pressure measuring probe, capillary tube, filling liquid and pressure transmission head.
One end of the pressure measuring probe is provided with an elastic metal diaphragm
When the pressure acts directly on the surface of the measuring diaphragm, the diaphragm will have a slight deformation.
The high-precision circuit on the measuring diaphragm transforms this tiny deformation into a highly linear voltage signal proportional to the pressure and also proportional to the excitation voltage.
Then use a special chip to convert this voltage signal into an industry standard 4-2OmA current signal or 1-5V voltage signal.
Because the measuring diaphragm adopts standard integrated circuit, which contains linear and temperature compensation circuits, it can achieve high precision and high stability.
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.
Diaphragm pressure gauge consists of a diaphragm isolator and a universal pressure gauge to form a system pressure gauge. The spring tube is evacuated by special equipment. And fill people with irrigation fluid. Seal it with a diaphragm. When the pressure P of the measured medium acts on the diaphragm, it deforms. The working fluid filled in the compression system makes the working fluid form a △ P equivalent to P, with the help of work. The conduction of the liquid causes a corresponding elastic deformation-displacement at the free end of the elastic element (spring tube) in the pressure meter. According to the working principle of the pressure instrument matched with it, the measured pressure value is displayed.
Diaphragm pressure gauges consist of a system of diaphragms and universal pressure gauges. Diaphragm pressure gauges and equipment are mainly connected with threaded connections, flange connections and sanitary clamps. Diaphragm pressure gauges are suitable for measuring the pressure of medium with strong corrosion, high temperature, high viscosity, easy to crystallize, easy to solidify, and solid floats, as well as occasions where the measurement medium must be avoided from entering the general-purpose pressure meter and to prevent the accumulation of sediment and easy to clean.
The characteristics of the filling fluid determine the performance of the sealing system to a large extent, both in response time and temperature to the heat dissipation conditions. The initial consideration in choosing a sealed diaphragm to fill fluid is the media compatibility of the process. Glycerin, silicone oil and halogenated carbon are the most commonly used sealed diaphragm filling fluids. In general there are three ways to fill a diaphragm seal: 1. Filling a diaphragm seal after assembly of the seal to the instrument 2. Filling a diaphragm seal before assembly of the seal to the instrument 3. Filling a diaphragm seal with a capillary between the seal and the instrument
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Sino-Inst is a manufacturer of Diaphragm Seal Pressure Transmitters.
Sino-Inst offers over 20 Diaphragm Seal Pressure Transmitters at best price. About 50% of these are Pressure level Transducer, 40% are Differential Pressure transmitters, and 40% are Diaphragm Seal Pressure transmitters. A wide variety of Diaphragm Seal Pressure Transmitters options are available to you, such as free samples, paid samples.
Sino-Inst is a globally recognized supplier and manufacturer of Diaphragm Seal Pressure Transmitters, located in China. Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Diaphragm Seal Pressure Transmitters products are most popular in Domestic Market, Southeast Asia, and Mid East.
You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.
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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 differential pressure transmitter is used to prevent medium from entering transmitter. The pressure sensitive diaphragm and the transmitter are connected by a capillary filled with fluid. It is used to measure the level, flow and pressure of fluids, gases or steam.
Remote Seal Differential Pressure Transmitter is often used as a tank level transmitter. The smart pressure transmitter is connected with a stainless steel flange by capillary. The pressure is sensed by a remote transmission device installed on a pipe or container. The pressure is transmitted to the body of the transmitter through the filling silicone oil in the capillary. Then The delta chamber and the amplifying circuit board in the main body of the transmitter convert the pressure or differential pressure to 4 ～ 20mA. The DC signal is output. It can communicate for the setting and monitoring by cooperating with the HART communicator.
Sino-Inst offers a variety of DP pressure transmitters for industrial pressure measurement. Connection with diaphragm seals. If you have any questions, please contact our sales engineers.
Features of Remote Seal Differential Pressure Transmitter
Simulate the “online operation” assessment one by one. Ensure that the transmitter works stably and reliably under the extreme ambient temperature, medium temperature and working pressure (including positive pressure or vacuum).
Adopt “dynamic profile” remote transmission diaphragm structure. The diaphragm will not be damaged after overload. The accuracy will not change after long-term work.
The filling system with full fusion welding and rigid sealing structure is selected to eliminate the occurrence of oil leakage.
Novelly designed capillary coupling parts. Capillary is reliably protected. It is not easy to break when used on site.
Variety, form and size of remote transmission device. And a variety of filling liquid types. It can meet the measurement needs of various occasions.
Various special products can be provided. Including high temperature, high vacuum, fast response and unequal length capillary (length ≤ 3 meters) remote transmission pressure transmitter
Specifications of Remote Seal Differential Pressure Transmitter
Output signal:
4 ～ 20MA. DC two-wire system (analog) superimposes the digital signal on the two-wire 4 ～ 20mA DC signal, and the user selects linear or square root output.
Power supply:
12 ～ 45V.DC;
Load characteristics:
Power supply impact: <0.005% output range / V; Load effect: when the power supply is stable, there is no load effect; Measurement accuracy: ± 0.1% of the adjustment range, ± 0.2% standard accuracy is ± 0.2%, if other accuracy is selected, please indicate when ordering and selecting; Range ratio: 10: 1 or 100 to 1; Resistance: usually adjustable from 0.1 to 16 seconds, when inert liquid is filled or with a remote transmission device, the time constant will increase; Startup time: <2 seconds, no warm-up is required.
0.05% large range value, receiving radiation frequency 27 ～ 500MHz, test field strength 3V / m.
Indication table (%):
LCD digital display accuracy ± 0.2%.
Vibration effect:
± 200% / g when vibrating at 200Hz in any direction.
Installation position:
The diaphragm is not installed vertically, and a zero error of less than 0.24KPa may occur, but it can be corrected by zero adjustment.
Weight:
3.9Kg (excluding accessories).
Note: ① The working pressure of the remote pressure transmitter also depends on the specifications of the selected flange. ② The working temperature of the remote transmission device is determined by the type of filling liquid selected. ③ The remote transmission pressure transmitter refers to the output change produced by the temperature of the remote transmission device on one side. ④ The effects of static pressure and temperature are measured during a large range. ⑤ The length of the capillary on the side of the GP remote pressure transmitter is generally 1.5 meters, and the length should not exceed 3 meters (special agreement is agreed).
DP Remote Seal Pressure Transmitter with Diaphragm Seal Installation
Rosemount 1199 remote transmission diaphragm system provides the world’s most extensive product variety and specifications to meet the requirements of various measurements and applications.
There are the following types of remote transmission differential pressure / level transmitters: 1) PFW flat type remote transmission device 2) RTW thread installation type remote transmission device 3) EFW inserted barrel remote transmission device 4) RFW flange mounted remote transmission device 5) SCW hygienic remote transmission device
The 1199 remote diaphragm can be assembled to Sino-Inst differential, gauge and absolute pressure transmitters and liquid level transmitters.
Applications of Remote Seal Differential Pressure Transmitter
Remote Seal Differential Pressure Transmitter is a pressure sensor assembly used to prevent the medium in the pipeline from directly entering the transmitter. It is connected to the transmitter by a capillary filled with fluid. It is used to measure the liquid level, flow rate and pressure of liquid, gas or steam. Then it is converted into 4 ～ 20mA DC signal output. The applicable media are as follows:
Viscous medium at high temperature;
Easily crystallized medium;
Precipitation medium with solid particles or suspended matter;
Strongly corrosive or highly toxic medium;
It can eliminate the occurrence of leakage of the pressure guiding pipe and pollute the surrounding environment. It can be avoided when using the isolation liquid. Because of the unstable measurement signal.
Continuously and accurately measure the interface and density;
The remote transmission device can avoid the mixing of different instantaneous media. So that the measurement results truly reflect the actual situation of process changes;
Places with high sanitation requirements;
Such as in the production of food, beverage and pharmaceutical industries. Not only does the transmitter contact with the media meet hygienic standards, but it should be easy to rinse to prevent cross-contamination of different batches of media.
In the use process, we should pay attention to consider the following situations:
When measuring the liquid pressure, the installation location of the remote pressure transmitter should avoid the impact of the liquid (that is, the water hammer phenomenon). In order to prevent the sensor from being damaged by overpressure.
When the remote pressure transmitter transmitter freezes in winter. The transmitter installed outdoors must take anti-freezing measures. Avoid expansion of liquid in the pressure port due to icing volume. Lead to sensor damage.
When wiring, pass the cable through the waterproof connector (accessory) or the flexible tube and tighten the sealing nut. In order to prevent rainwater etc. from leaking into the transmitter housing through the cable.
When the remote pressure transmitter is used to measure the liquid pressure. The pressure tap should be opened on the side of the process pipe. In order to avoid sedimentation and accumulation of slag.
To prevent the flange liquid transmitter from contacting with corrosive or overheated media. It is also necessary to prevent scum from depositing in the duct;
When measuring the pressure of the gas, the pressure port should be opened at the top of the process pipeline. And the flange level transmitter should also be installed in the upper part of the process pipeline. In order to quickly deposit the deposited liquid into the process pipeline.
When measuring the steam or other high temperature medium of the remote pressure transmitter, it is necessary to connect a condenser such as a buffer tube (coil tube). The operating temperature of the transmitter should not be exceeded.
Remote Seal Differential Pressure Transmitters Working Principle
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.
What are the advantages of diaphragm seals?
Diaphragm seals offer the advantage that the “contact surface” between pressure medium and diaphragm is relatively large. Thus ensuring accurate pressure measurement, especially for very low pressures (< 600 mbar). Furthermore, they can be easily dismounted, e.g. for cleaning or calibration purposes.
How do diaphragm seals work?
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.
Diaphragm type level transmitter working principle
Smart differential pressure transmitters are often used to measure liquid level, flow rate, etc. Differential pressure transmitter cooperates with sealing diaphragm, capillary, etc.
The differential pressure type liquid level gauge uses the principle that when the liquid level in the container changes, the static pressure generated by the liquid column also changes accordingly, as shown in the figure.
For closed tanks. Set the bottom pressure to P. If the pressure on the liquid surface is P3 and the liquid level height is H, then: P = P3 + Hpg (3-11) In the formula: p is the medium density; g is the acceleration of gravity. From the formula ((3-1 “available: △ P = P-P3 = Hpg (3-12) Usually the density of the measured medium is known, the pressure difference △ P is proportional to the liquid level height H. The pressure difference on the side will know the measured liquid level height.
When the container under test is open, the gas pressure is atmospheric pressure. The negative pressure chamber of the differential pressure gauge can be vented to the atmosphere. It is known that the pressure gauge can also be used to measure the liquid level at this time.
If the container is closed, you need to connect the negative pressure chamber of the differential pressure gauge to the gas phase of the container.
Pressure level transmitter is good for level measurement. Most of the time, we use submersible hydrostatic level sensor for the level measurement. When you can not use the probe of hydrostatic level sensor, you can try with this pressure level transmitter. Pressure level transmitter, is one type of DP level measure instrument, with the diaphragm.
SMT3151LT Differential pressure (DP) level transmitter a new type of differential pressure (DP) transmitter produced by advanced technology and equipment. Continuous level, flow and differential pressure measurement. Liquid level measurement, is the most common measurement process in continuous production processes, such as: petroleum and chemical industry. The liquid level measuring instrument currently widely used, is the differential pressure level transmitter.
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. More
What is remote seal for level transmitter?
Remote seals are commonly used to protect pressure-measuring instruments including pressure gauges, pressure transmitters, and switches from hot, viscous, contaminated, or corrosive media. As a result, they’re often used in refining, petrochemical, and chemical plants. More Remote Diaphragm Seal System Pressure Transmitters
What is differential pressure transmitter working principle?
The basic principle of a differential pressure transmitter is to divide a space into two chambers with sensitive elements. When introducing pressure into the two chambers respectively. The sensor produces displacement (or displacement trend) under the combined action of the two pressures. This displacement is proportional to the pressure difference (differential pressure) between the two chambers. Convert this displacement into a standard signal output that can reflect the magnitude of the differential pressure. A differential pressure transmitter is a transmitter that measures the pressure difference between the two ends of the transmitter. Output standard signals (such as 4 ~ 20mA, 0 ~ 5V). Differential pressure transmitters are different from general pressure transmitters in that they have two pressure interfaces. Differential pressure transmitters are generally divided into positive pressure end and negative pressure end. In general, the pressure at the positive pressure end of the differential pressure transmitter should be greater than the pressure in the negative pressure section to measure. Extended Reading: Liquid pressure sensor
What is diaphragm seal pressure transmitter?
Diaphragm seal pressure transmitter with flange direct mount is good for level measurement. Diaphragm seals, also known as chemical seals or flush seals. Diaphragm seals work with pressure transmitter, pressure gauges. To prevent process medium from entering into the pressure-sensing assembly. So, Diaphragm seal systems protect pressure transmitters from hot, viscous, contaminated or corrosive media. Diaphragm seal connection can work with the capillary, flange and manufold. Like remote seal pressure transmitter, DP level transmitter. More
Extended Diaphragm Seal DP Level Transmitter Extended Diaphragm Seal DP Transmitter is a level transmitter direct mounted on pipe or tank. The isolation diaphragm is in direct contact with the liquid medium.
Flange Mounted Differential Pressure Transmitter Flange Mounted Differential Pressure Transmitter is also called single flange DP level transmitter. For liquid, gas or vapor pressure measurement.
Remote Diaphragm Seal Pressure Transmitter Remote seal pressure transmitter, with capillary and diaphragm seal, remote mount. Diaphragm seal systems protect pressure transmitters from hot, viscous, contaminated or corrosive media.
Sino-Instrument offers Remote Seal Differential Pressure Transmitters. A wide variety of Remote Seal Differential Pressure Transmitter 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. Remote Seal Differential Pressure Transmitter 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
Please enable JavaScript in your browser to submit the form
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.
Extended Diaphragm Seal DP Transmitter is a level transmitter direct mounted on pipe or tank. The isolation diaphragm is in direct contact with the liquid medium.
Extended Diaphragm Seal DP Level Transmitter is a field level transmitter that is directly mounted on a pipe or container. The isolation diaphragm is in direct contact with the liquid medium. There is no need to lead out the positive pressure side with a pressure pipe. Therefore, it can measure the liquid level, pressure and density of high temperature, high viscosity, easy crystallization, easy precipitation and strong corrosion. Convert to 4 ～ 20mA. DC signal output.
The flanges are made of high-quality stainless steel materials such as 304 and 316. Wetted diaphragms are made of imported high-quality anti-corrosive materials such as 316L, Hastelloy C-276, Monel, and tantalum.
Sino-Inst offers a variety of DP pressure transmitters for industrial pressure measurement. Connection with diaphragm seals. If you have any questions, please contact our sales engineers.
Features of Extended Diaphragm Seal Differential Pressure Transmitter
Simple structure: There are no movable or elastic elements. Therefore, the reliability is extremely high. The amount of maintenance is very small.
Easy installation: The built-in structure especially shows this feature. No special tools are required.
Convenient adjustment: The two potentiometers of zero position and range can carry out zero point migration or range change at will within the effective range of liquid level detection. The two adjustments do not affect each other.
Widely used: Suitable for liquid level measurement of high temperature and high pressure, strong corrosion and other media.
Specifications of Extended Diaphragm Seal Level Transmitter
Measuring range:
can be customized within the range of -4-4MPa (-10-10KPa, 0-50KPa, etc.)
Output signal:
4 ～ 20MA.DC two-wire system (analog). Two-wire system 4 ～ 20mA DC signal is superimposed with digital signal. Linear or square root output is selected by the user. (Smart)
Power supply:
12 ～ 45V.DC
Range ratio:
10: 1 or 100 to 1
Power supply impact:
<0.005% output range / V
Load effect:
When the power supply is stable, there is no load effect.
Measurement accuracy:
0.1% of the calibration range. Standard accuracy is 0.2%. If other accuracy is selected, please indicate when ordering and selecting.
Resistance:
usually adjustable between 0.1 to 16 seconds. When filling with inert liquid or with a remote transmission device, the time constant will increase.
Applications of Extended Diaphragm Seal DP Level Transmitter
Extended Diaphragm Seal DP Transmitter can measure the liquid level, pressure and density of high temperature, high viscosity, easy crystallization, easy precipitation and strong corrosion and other media. Then convert it to 4-20mA. DC signal output
Mainly used for measurement in the following occasions:
Viscous medium at high temperature.
Easily crystallized medium.
Precipitated media with solid particles or suspended matter.
Strongly corrosive or highly toxic media.
It can eliminate the leakage of the pressure guiding pipe and pollute the surrounding environment. When the isolation liquid is used, the tedious work of frequently replenishing the isolation liquid due to the unstable measurement signal can be avoided.
Continuously and accurately measure the interface and density.
The remote transmission device can avoid the mixing of different instantaneous media, so that the measurement results truly reflect the actual situation of process changes.
Hygiene and cleaning requirements are high.
For example, in the production of food, beverage and pharmaceutical industries, not only the location of the transmitter in contact with the media must meet hygienic standards, but it should be easy to rinse.
Diaphragm seals are used for the protection of pressure measuring instruments in applications with difficult media. In diaphragm seal systems, the diaphragm of the diaphragm seal affects the separation of the instrument and the medium.
The pressure is transmitted to the measuring instrument via the system fill fluid which is inside the diaphragm seal system.
For the implementation of demanding customer applications, there are a wide variety of designs, materials and system fill fluids available.
Applications
Aggressive, highly viscous, crystallising or hot media
The differential pressure type liquid level gauge uses the principle that when the liquid level in the container changes, the static pressure generated by the liquid column also changes accordingly, as shown in the figure.
For closed tanks. Set the bottom pressure to P. If the pressure on the liquid surface is P3 and the liquid level height is H, then:
P = P3 + Hpg (3-11)
In the formula: p is the medium density; g is the acceleration of gravity. From the formula ((3-1 “available: △ P = P-P3 = Hpg (3-12)
Usually the density of the measured medium is known, the pressure difference △ P is proportional to the liquid level height H. The pressure difference on the side will know the measured liquid level height.
When the container under test is open, the gas pressure is atmospheric pressure. The negative pressure chamber of the differential pressure gauge can be vented to the atmosphere. It is known that the pressure gauge can also be used to measure the liquid level at this time. If the container is closed, you need to connect the negative pressure chamber of the differential pressure gauge to the gas phase of the container.
Pressure level transmitter is good for level measurement. Most of the time, we use submersible hydrostatic level sensor for the level measurement. When you can not use the probe of hydrostatic level sensor, you can try with this pressure level transmitter. Pressure level transmitter, is one type of DP level measure instrument, with the diaphragm.
SMT3151LT Differential pressure (DP) level transmitter a new type of differential pressure (DP) transmitter produced by advanced technology and equipment. Continuous level, flow and differential pressure measurement. Liquid level measurement, is the most common measurement process in continuous production processes, such as: petroleum and chemical industry. The liquid level measuring instrument currently widely used, is the differential pressure level transmitter.
SMT3151DP intelligent differential pressure transmitter uses advanced microprocessor technology and digital communication technology. The basic principle of differential pressure transmitter is: divide a space with sensitive elements (multi-purpose capsule) into two chambers. Introduce pressure into the two chambers separately. The sensor produces displacement (or displacement trend) under the combined action of the two pressures. This displacement is proportional to the pressure difference (differential pressure) between the two chambers. Convert this displacement into a standard signal output that can reflect the magnitude of the differential pressure.
Comparative analysis – 7 Tank Level Measurement Sensors
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 diaphragm pressure gauge application spans from 10 mbar to 60 bar. The measuring element consists of one circular diaphragm, clamped between a pair of flanges.
The positive or negative pressure, acting on these diaphragms causes deformation of the measuring element. The magnitude of the deformation is proportional to the pressure to be measured, and it is coupled to the pointer mechanism.
0…10 mbar to 0…40 bar (unfilled) 0…60 mbar to 0…60 bar (filled)
Nominal size
100 mm 160 mm
Mechanical design
Stainless steel case with bayonet ring
Connections at bottom the enlarged channel opening in case of PTFE lining, optional open flange
Stainless steel
EN 837-3 accuracy
Class 1.6 Class 2.5 (with protecting foil)
Maximum pressure load Static load Dynamic load Overload
100 % of full scale values 90 % of full scale values Up to 5-times, max. 40bar
Connection threads and materials of SI-D100 Diaphragm pressure gauge
Type 316L pressure gauges with stainless steel connection are available with a stainless steel diaphragm (40 to 250 mbar) , or a Duratherm diaphragm (0.4 to 40 bar).
In addition, they can optionally be produced with PTFE lining.
Options of SI-D100 Diaphragm pressure gauge
Inlet port orifice up to Ø 10 mm
Hygienic connection,
e.g. according to DIN 11851, DN 25 to DN 50,
with or without lateral cleaning valve
Other connection flanges according to former DIN standards
Special installation or connection orientation
Special scales such as dual ranges, fine-division (with knife-edge pointer) Stationary red pointer on the dial, or with external adjustment)
Maximum indicating pointer, external adjustment
Window acryl glass or polycarbonate (only for display ranges ≥ 0…100 mbar)
Tantalum (> 160 mbar, vacuum tight upon request), sealing PFTE, others upon request
Up to 10-times overload protection, but max. 40 bar (600 psi) for measuring flange Ø 100 mm (3.94“) max. 2.5 bar (40 psi) for measuring flange Ø 160 mm (6.3“)
Other filling fluid, silicone oil for temp. down to -40 °C (flange sealing PTFE)
Version for temperatures > 100 °C
Electrical accessories
More Diaphragm Pressure Gauge Technical Guide
A diaphragm pressure gauge is a tool that measures the pressure of a gas or liquid by using a flexible diaphragm. The diaphragm will move in response to changes in pressure, and this movement is then translated into a reading on a dial.
These gauges are commonly used in industries like manufacturing, oil and gas, and chemical processing to monitor and control pressure in various processes. They are also commonly used in HVAC systems to measure the pressure of air and other gases.
Diaphragm pressure gauges are relatively easy to use and maintain, and they are often chosen for their accuracy, durability, and affordability. They come in different sizes, materials, and pressure ranges, making them versatile tools that can be used in a wide range of applications.
Diaphragm pressure gauge construction
A diaphragm pressure gauge is a device that uses a diaphragm with a known pressure to measure pressure in a fluid.
It has many different uses, such as monitoring the pressure of a canister of gas, measuring atmospheric pressure. Or recording the strength of the vacuum in a vacuum pump.
The diaphragm pressure gauge consists of a circular membrane, made from sheet metal of precise dimensions, which can either be flat or corrugated.
The diaphragm is mechanically connected to the transmission mechanism, which will amplify the small deflections of the diaphragm, and transfer them to the pointer.
The animation below shows the pressure gauge working principle.
You can see the movement of the diaphragm and the functioning of the transmission mechanism.
The process pressure is applied to the lower side of the diaphragm, while the upper side is at atmospheric pressure.
The differential pressure arising across the diaphragm lifts up the diaphragm and puts the pointer in motion.
The deflection of the diaphragm is very small (+/- 1 mm), making it necessary to use a high-ratio multiplying movement, to rotate the pointer along the full length of the scale.
The actuation of such a high-ratio transmission mechanism is possible, because diaphragm deflection is able to generate large forces.
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Advantages:
Disadvantages:
Versatility: can measure pressure of a wide range of fluids and gases
Limited range: may not be suitable for high or low pressures
Accuracy: provide precise measurements
Sensitivity to overpressure: can be damaged and affect accuracy
Cost-effective: relatively affordable
Susceptibility to damage: diaphragm can be damaged by certain fluids
Durability: made of durable materials and can withstand harsh conditions
Environmental factors: accuracy can be affected by changes in temperature, humidity, etc.
Pressure gauges with horizontal diaphragm allow to find suitable versions for even difficult kinds of media. Such as aggressive, contaminated or viscous media.
The stainless steel bayonet ring case is designed for applications, where a rust-resistant, sealed case of high chemical resistance is required (dirty damp, or corrosive atmosphere).
For measuring points with increased overload;
With liquid-filled case suitability for high dynamic pressure loads and vibrations (model 433.50);
For gaseous, liquid and aggressive media, also in aggressive environments;
With the open connecting flange option also for contaminated and viscous media;
Process industry:
Chemical, petrochemical, power plants, mining,
on-/offshore, environmental technology,
machine building and general plant construction
There are various types of pressure instruments. In addition to pressure sensors, pressure transmitters. Pressure gauges are also commonly used.
The function of a pressure gauge is to measure the pressure of fluids and gases in various industrial, commercial, and residential applications. Pressure gauges are used to monitor and regulate the pressure of liquids and gases in tanks, pipelines, and other containers to ensure that They are operating safely and efficiently.
The pressure gauge works by measuring the force that the fluid or gas exerts on a sensing element, which is typically a flexible diaphragm or a curved tube called a Bourdon tube. The sensing element then converts this force into a mechanical or electrical signal, which is displayed on the gauge as a pressure reading. .
In summary, the function of a pressure gauge is to provide accurate and reliable measurements of pressure in various applications to ensure the safety and efficiency of systems and equipment.
Difference between bourdon tube and diaphragm pressure gauge
The working principle of the pressure gauge is through the elastic deformation of the sensitive element in the gauge. Then the pressure change is transmitted to the pointer by the conversion mechanism of the movement in the watch. Cause the pointer to rotate to show pressure. Sensitive element may be a Bourdon tube, diaphragm, bellows.
Therefore, the essential difference between the bourdon tube and diaphragm pressure gauge is the different sensitive components for pressure measurement.
Bourdon tube pressure gauge: The sensitive element of the Bourdon tube is an elastic C-shaped tube bent into a circle with an oval cross-sectional area. The pressure of the measuring medium acts on the inside of the wave tube. In this way, the elliptical cross-section of the Bourdon tube will tend to be circular. Due to the slight deformation of the Bourdon tube, a certain ring stress is formed. This ring stress causes the Bourdon tube to extend outward. Since the head of the elastic Bourdon tube is not fixed, it will deform slightly. The amount of deformation depends on the pressure of the measuring medium. The deformation of the Bourdon tube displays the pressure of the measured medium indirectly by the pointer through the movement.
Diaphragm pressure gauge: The sensitive element of the Diaphragm is composed of two membranes with circular waves connected together. The pressure of the measuring medium acts on the inside of the capsule cavity. The resulting deformation can be used to indirectly measure the pressure of the medium. The pressure value is indicated by the pointer. The capsule pressure gauge is generally used to measure the pressure of the gas, and it can also measure the micro-pressure and over-pressure protection to a certain extent. When several bellows sensitive components are stacked together, a large transmission force will be generated to measure very small pressure.
Bourdon tubes have the following advantages over diaphragm elements:
They cover small pressure ranges from 0 to 0.6 bar up to high pressure ranges from 0 to 10,000 bar.
They enable accuracies up to class 0.1 of the calibration regulations.
They are easier to manufacture.
They can easily be connected or sealed with the pressurised components. Depending on the material and pressure load, they are either soldered, welded or screwed to them.
Diaphragm pressure gauges are used when a Bourdon tube pressure gauge reaches its limits.
Diaphragms can be made from a variety of materials, such as stainless steel or synthetic materials like rubber or silicone. They are designed to be durable and withstand the pressure and conditions of the environment in which they are used.
The capsule pressure gauge is also called micro pressure gauge. It is suitable for measuring the low micro-pressure of liquid, gas or steam which has no explosion risk, no crystallization, no solidification, and corrosive effect on copper and copper alloys. The capsule pressure gauge uses the capsule as a sensitive element for measuring small pressures. Measure the micro-pressure and negative pressure of the corrosive effect on the copper alloy, no explosion hazard gas. Widely used in boiler ventilation, gas pipeline, combustion device and other similar equipment.
In the pressure gauge, the pressure measured by the diaphragm is generally regarded as relative pressure. Generally, the relative point is selected as atmospheric pressure. The elastic deformation of the diaphragm under the pressure of the medium. Amplified by the gear transmission mechanism of the pressure gauge. The pressure gauge will show the relative value to the atmospheric pressure (either high or low).
There are several different types of pressure gauges that are commonly used in different applications:
Bourdon Tube Pressure Gauge: This type of gauge uses a curved tube that is attached to the gauge mechanism. As the pressure of the fluid or gas being measured increases, the tube straightens out, causing the gauge mechanism to move and display the pressure reading.
Diaphragm Pressure Gauge: As we discussed earlier, diaphragm pressure gauges use a flexible membrane that responds to changes in pressure by expanding or contracting. This movement is then converted into a reading on the gauge.
Differential Pressure Gauge: This type of gauge measures the difference in pressure between two points in a system. It consists of two pressure inputs and a gauge mechanism that calculates the difference between the two inputs.
Digital Pressure Gauge: This type of gauge uses electronic sensors to measure pressure and displays the reading on a digital screen.
Compound Pressure Gauge: This type of gauge can measure both positive and negative pressures. It uses two Bourdon tubes, one for positive pressure and one for negative pressure, to display the reading on the gauge.
Overall, the type of pressure gauge used will depend on the specific application and requirements. Each type of gauge has its own advantages and disadvantages, and it’s important to choose the right one for the job.
Different Types of Pressure have different characteristics. Different pressure transmitters bear different pressure types. Common pressure types include absolute pressure,…
A wide variety of Diaphragm pressure gauge options are available to you, such as free samples, paid samples.
Sino-Instrument is a globally recognized supplier and manufacturer of Diaphragm pressure gauge, located in China.
The top supplying country is China (Mainland), which supply 100% of Diaphragm pressure gauge respectively.
Sino-Instrument sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Diaphragm pressure gauge products are most popular in Domestic Market, Southeast Asia, and Mid East.
You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.
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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.
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.
Diaphragm seal pressure transmitter, with flange connection, direct mount. Diaphragm seal systems protect pressure transmitters from hot, viscous, contaminated, or corrosive media.
Diaphragm seal pressure transmitter with flange direct mount. Diaphragm seals, also known as chemical seals or flush seals. Diaphragm seals work with pressure transmitters, pressure gauges. To prevent the process medium from entering into the pressure-sensing assembly. So, Diaphragm seal systems protect pressure transmitters from hot, viscous, contaminated, or corrosive media. Diaphragm seal connection can work with the capillary, flange, and manifold. Like remote seal pressure transmitter, DP level transmitter.
Sino-Inst offers a variety of Diaphragm Seal Pressure Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.
What are the application considerations for diaphragm seals?
The biggest advantage of the diaphragm pressure transmitter is that different diaphragm materials can be selected. According to different corrosion, media to achieve the best corrosion resistance. The commonly used diaphragm materials are SUS316L stainless steel. Tantalum, Hastelloy, Monel, Pure titanium, F4, etc.
When choosing a diaphragm pressure transmitter, in addition to the correct choice of structure and range, the more important thing is to choose the material. The so-called reasonable is to consider its corrosion resistance, but also to consider the economy. For example, the corrosion resistance of the tantalum diaphragm and Hastelloy is excellent, but it is expensive. Only used in environments with high corrosivity and other cheap materials are not suitable.
The following table introduces several common corrosion-resistant materials that can be selected for corrosion media. For your reference.
The diaphragm seal pressure transmitter is the flange type pressure transmitter. This type of pressure transmitter, assembling diaphragm seals to field transmitters for the purpose of measuring pressure, differential pressure, level, and flow.
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.
Diaphragm seals offer the advantage that the “contact surface” between pressure medium and diaphragm is relatively large. Thus ensuring accurate pressure measurement, especially for very low pressures (< 600m bar). Furthermore, they can be easily dismounted, e.g. for cleaning or calibration purposes.
How do diaphragm seals work?
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.
Rosemount 1199 remote transmission diaphragm system provides the world’s most extensive product variety and specifications to meet the requirements of various measurements and applications.
There are the following types of remote transmission differential pressure/level transmitters: 1) PFW flat type remote transmission device 2) RTW thread installation type remote transmission device 3) EFW inserted barrel remote transmission device 4) RFW flange mounted remote transmission device 5) SCW hygienic remote transmission device
The 1199 remote diaphragm can be assembled to Sino-Inst differential, gauge, and absolute pressure transmitters and liquid level transmitters.
Cryogenic pressure transducer for low temperature pressure measurement. -196℃～+125℃、-260℃/-350c（especial）. Sino-Inst offers a variety of Pressure Sensors…
Intelligent Pressure Transmitter is also called smart pressure transmitter. As far as the composition structure of…
FAQ
The purpose of the diaphragm seal is to protect expensive instruments. Its job is to transfer the pressure of the process medium through the membrane seal to the filling fluid and then transmit the resulting pressure wave to a pressure gauge or sensor at the head of the measuring assembly. Choose a suitable diaphragm seal filling liquid. The characteristics of the diaphragm seal fill fluid determine the performance of the sealing system to a large extent. Both in response time and temperature dissipation conditions. The initial consideration in choosing a sealed diaphragm to fill fluid is the media compatibility of the process. The temperature and pressure of the process medium are also important factors because all the filling fluid expands or contracts with changes in temperature. Remember that there is a direct relationship between the measured response time of the viscosity and the density of the filling fluid. More viscous filling fluids lead to longer response times. In addition, the filling fluid with a higher density can have an impact on the mounting. Types of filling fluid: glycerin, silicone oil, and halogenated carbon are the most commonly used sealing diaphragm filling fluids.
The combinations of diaphragm seals with flange connections can be used for processes with extreme temperatures and with aggressive, adhesive, corrosive, highly viscous, environmentally hazardous or toxic media. With its connection dimensions, the flange-type diaphragm seal is suitable for all currently used standard flanges and is mounted in lieu of a blind flange.
Diaphragm-sealed pressure transmitters are used when the medium is corrosive or will corrode the internal parts of the transmitter (for example, ammonia will corrode the copper in the transmitter).
The measurement accuracy of flat film and convex film is the same, but there is a difference in the measurement structure. The choice of the two types of diaphragms is mainly based on the different applications. For example, in regular occasions, the material is easy to flow and not easy to crystallize and block. Just use a flat diaphragm. If the measuring medium is easy to crystallize and block, consider the convex diaphragm structure. Of course, we must also consider the installation and pressure pipe issues.
We offer all types of Diaphragm Seal Pressure Transmitters. Like Direct Mounted, flange-mounted, single flange, double flange, Remote Diaphragm Seals, High Static, Digital Remote.
Diaphragm Seal Pressure Transmitters are generally available with three types of electrical output; millivolt, amplified voltage, and 4-20mA.
You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification. We will share more about instrument calibration, like theflow transmitter calibration.
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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.
Flange Mounted Differential Pressure Transmitter is also called single flange DP level transmitter. For liquid, gas or vapor pressure measurement.
Flange Mounted Differential Pressure Transmitter also called DP level transmitter/pressure level transmitter. The smart differential pressure transmitter/pressure transmitter is provided with a diaphragm seal. Realize the measurement of liquid level. 4-20mA output. Flange Mounted Differential Pressure Transmitter is flange mounted. The isolation diaphragm is very thin and is a weak link in corrosion resistance. So, the material of the wetted diaphragm is 316L, Hastelloy C-276, Monel, tantalum. Suitable for anti-corrosion requirements in different situations. It can be reasonably selected according to the measured medium concentration, humidity, pressure, and other parameters.
Sino-Inst offers a variety of flange-mounted DP transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.
The high-performance flange mounted differential pressure transmitter HHXA-EJA210E can be used to measure levels of densities of solidifying or precipitating liquids. The HHXA-EJA210E single-flange differential pressure transmitter can also communicate with the HART275/475 Communicator to set and check it. Outputs a 4 to 20 mA DC signal, corresponding to the measured differential pressure. HHXA-EJA210E single flange differential pressure transmitter uses advanced micro-processing technology and digital communication technology. Besides all the functions of conventional intelligence. It also has a series of enhanced functions. Such as zero-point automatic adjustment, remote local control parameter viewing, and adjustment control parameter password lock. At the same time, remote parameter setting, remote control, self-diagnosis, and other functions are performed through the Fieldbus HART protocol.
The HHXA-EJA210E is the Flange-mount Liquid Level Transmitter in the H&HXA-EJA series. Rosemount 3051 and Yokogawa EJA functional alternatives. We also supply an SMT3151LT Differential pressure level transmitter for level measurement.
The single flange level gauge is an extension and development of the pressure transmitter technology. According to the principle that the pressure generated by the liquid of different specific gravity at different heights has a linear relationship. The realization of the volume, liquid height, water, oil and paste Accurate measurement and transmission of weight.
Innovative indication, intuitive reading and eye-catching. The direction of the observation indicator can be changed according to user needs.
The structure is simple: there are no movable or elastic elements. Therefore, the reliability is extremely high. The amount of maintenance is very small.
Easy installation: the built-in structure especially shows this feature. No special tools are required.
Convenient adjustment: the two potentiometers of zero position and range can arbitrarily carry out zero point migration or range change within the effective range of liquid level detection. The two adjustments do not affect each other.
Widely used: It is suitable for liquid level measurement of high temperature, high pressure, strong corrosion and other media.
Large measuring range. Not limited by the height of the storage tank.
The indicator mechanism is completely isolated from the measured medium. It has good sealing, high reliability and safe use.
With intrinsically safe explosion-proof and isolation explosion-proof capabilities. Can be used in various hazardous locations
With anti-blocking design, it can measure the liquid level of the pasty medium.
Fine and unique zero point, full range, non-linear compensation. To ensure the accuracy of the instrument within the scope of use conditions, long-term stability.
The high performance flange mounted differential pressure transmitter EJA210E, can be used to measure levels of densities of solidifying or precipitating liquids. EJA210E outputs a 4 to 20 mA DC signal, corresponding to the measured differential pressure. Its accurate and stable sensor can also measure the static pressure, which can be shown on the integral indicator. Or monitored via BRAIN or HART communications. Other key features include quick response, remote set-up using communications and self-diagnostics. FOUNDATION Fieldbus and PROFIBUS PA protocol types are also available. All EJA-E series models in their standard configuration, except for the Fieldbus and PROFIBUS types, are certified as complying with SIL 2 for safety need.
The single-flange pressure / level transmitter can accurately measure the liquid level and density of various containers. There are two types of flat flange and plug-in flange. It is suitable for high viscosity medium or suspended liquid measurement.
Viscous medium at high temperature;
Easily crystallized medium;
Precipitation medium with solid particles or suspended matter;
Strongly corrosive or highly toxic medium;
It can eliminate the leakage of the pressure guiding pipe and pollute the surrounding environment. It can avoid the instability of the measurement signal when the isolation liquid is used. The tedious work of frequently supplementing the isolation liquid is required;
Continuously and accurately measure the interface and density;
The remote transmission device can avoid the mixing of different instantaneous media, so that the measurement results truly reflect the actual situation of process changes;
Places with high sanitation requirements;
Such as in the production of food, beverage and pharmaceutical industries. Not only the transmitter contacting the media parts meet the hygienic standards, but also should be easy to wash. To prevent cross-contamination of different batches of media.
Pressure level transmitter is good for level measurement. Most of the time, we use submersible hydrostatic level sensor for the level measurement. When you can not use the probe of hydrostatic level sensor, you can try with this pressure level transmitter. Pressure level transmitter, is one type of DP level measure instrument, with the diaphragm.
SMT3151LT Differential pressure (DP) level transmitter a new type of differential pressure (DP) transmitter produced by advanced technology and equipment. Continuous level, flow and differential pressure measurement. Liquid level measurement, is the most common measurement process in continuous production processes, such as: petroleum and chemical industry. The liquid level measuring instrument currently widely used, is the differential pressure level transmitter.
Working principle of Smart differential pressure transmitter
1. Head cover 2. Head 3. Metal bulkhead 4. Shell 5. Nameplate label 6. Explosion-proof joint 7. Terminal block 8. Head cover 9. Drain valve 10. Bolt 11. Clamp 12. Sensor seal 13. Sensor 14. Nut 15. Welded pipe joint assembly
SMT3151DP intelligent differential pressure transmitter uses advanced microprocessor technology and digital communication technology. The basic principle of differential pressure transmitter is: divide a space with sensitive elements (multi-purpose capsule) into two chambers. Introduce pressure into the two chambers separately. The sensor produces displacement (or displacement trend) under the combined action of the two pressures. This displacement is proportional to the pressure difference (differential pressure) between the two chambers. Convert this displacement into a standard signal output that can reflect the magnitude of the differential pressure.
Single flange. VS. Double flange differential pressure level transmitter
In principle: all are differential pressure transmitters + flange guide pressure;
In terms of structure: the single flange liquid zd position transmitter has only one flange diaphragm box connected to the high pressure side, and the low pressure side to the atmosphere. The double flange liquid level transmitter is high and low pressure side through oil-filled capillary It is connected with two flanged membrane return boxes. There is also a capillary. The single flange transmitter is installed below, and a capillary is drawn from the low pressure side of the single flange transmitter to the upper flange membrane box.
In terms of engineering applications: all can only measure the liquid level of fixed density. The single-flange transmitter can only be used for the liquid level of atmospheric equipment that can be imagined with the atmosphere. The double-flange transmitter can be suitable. Answer: Use closed equipment kettle to measure liquid level;
From the economical point of view, the double flange is definitely more expensive than the single flange. After all, there is one more flange capsule and capillary.
How to choose flange type liquid level transmitter?
Flange level transmitters often require special environmental processing during production. Requires small range and high accuracy. Flange level transmitters are also required to withstand high temperature, corrosion resistance and high overload withstand capability. Therefore, the scope of application must be clearly defined when selecting the flange type liquid level transmitter.
When choosing a flange-type liquid level transmitter, the following factors are mainly considered:
The measurement object, such as the physical and chemical properties of the measured medium. And working pressure and temperature, installation conditions, speed of liquid level change, etc .;
Measurement and control requirements. Such as measurement range, measurement accuracy, display method. On-site instructions, long-distance instructions, interface with computer, safety and anti-corrosion. Reliability and construction convenience.
When selecting a double-flange differential pressure transmitter, a very important factor must be paid attention to is the differential pressure level transmitter. It is installed at the bottom of the liquid container. The height of the liquid level is reflected by the gauge pressure signal. In the control process of liquid level measurement in the pharmaceutical and chemical industries. The container holding the liquid is often under pressure. At this time, the conventional static pressure liquid level transmitter cannot meet the measurement requirements. Due to improvements in the sensor circuit and structure. Improve the practical value of differential pressure liquid level measurement technology in the pharmaceutical and food industries.
Piezoresistive Differential Pressure Transmitter Piezoresistive Differential Pressure Transmitter utilizes the piezoresistive effect of semiconductor silicon materials. Realize accurate measurement of differential pressure.
Smart Differential Pressure Transmitter Smart Differential Pressure Transmitter measures industrial differential pressure. Can Works with diaphragm seals, capillary, HART. Outputs standard signals (such as 4 ~ 20mA, 0 ~ 5V).
We all know that the Yokogawa EJA210E Flange Mounted Differential Pressure Transmitter, which commonly used in liquid, gas or vapor pressure measurement.
Sino-Instrument can offer you with HHXA-eja110e\ HHXA-eja530e \ HHXA-eja210a\ HHXA-jx210a. Our transmitters can work for you just like yokogawa level transmitters.
To know how the HHXA-EJA210E can help you Boost your bottom line.
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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.
Differential pressure (DP) level transmitter is a perfect solution for tank level measurement. Flanges, seal diaphragms, capillaries, and DP transmitters are often used to measure liquid levels.
Differential pressure(DP) level transmitter is often used as a tank level transmitter. The DP transmitter is connected with a stainless steel flange by the capillary. Flange installation. The pressure is sensed by a remote transmission device installed on the container. The pressure is transmitted to the body of the transmitter through the capillary. The transmitter converts the pressure or differential pressure to 4 ～ 20mA. The DC signal is output. It can communicate for the setting and monitoring by cooperating with the HART communicator. Explosion-proof available.
Sino-Inst offers a variety of DP pressure transmitters for industrial pressure measurement. Connection with diaphragm seals. If you have any questions, please contact our sales engineers.
Features of Differential pressure (DP)level transmitter
The biggest feature of the differential pressure transmitter is that it can be easily installed on existing vessels. It can also be converted into a working tank or container.
The maintenance of the DP transmitter is easy because it can be isolated from the process by an isolation valve.
DP transmitter is ideal for liquid level measurement. It can also be used for light mud with an extended diaphragm, which can be installed flush on one side of the container.
Level measurement via DP transmitter is more cost-effective than other available sensors.
Since the DP transmitter is far away from the tank for liquid level measurement, it is easy to clean and maintain the tank.
The detection element takes up almost no space in the container. Instead, only two pressure holes need to be opened in the container wall.
There is no movable part in the detection part. Installation method, the work is more reliable.
The weight of the liquid column height per unit area is measured. The change of the measured medium weight will directly affect the measurement result. When the purpose of the measurement is to determine the weight storage of the material in the container. No additional amendments are required.
The use of flange pressure can solve the liquid level measurement of high viscosity, easy to crystallize, and medium with suspended matter. Evaporation and boiling liquid level can also be measured, but sometimes the error is large.
The display part of the instrument can usually adopt the general unit in the unit group instrument. No separate design is required.
There are four types of remote transmission devices for remote differential pressure transmitters:
When the measured medium has a corrosive effect on the transmitter connector and sensitive components;
When the high temperature measured medium needs to be isolated from the transmitter;
When there are solid suspended solids or high viscosity in the measured medium, it is easy to block the transmitter connector and the pressure chamber;
When the measured medium is easily cured or crystallized by the pressure tube;
When changing the measured medium needs to be rinsed and not to be mixed;
Hygienic conditions must be maintained to prevent pollution. .
Changing the measured medium requires strict purification of the measuring head
Differential pressure type level transmitter working principle
Differential pressure (DP) level transmitter is a differential pressure transmitter to prevent the measured medium from directly acting on the transmitter. The differential pressure transmitter uses remote transmission isolation diaphragm contact. The remote transmission differential pressure transmitter (double flange) is composed of a differential pressure transmitter and a welded remote flange with capillary tube. Its working principle is the same as the differential pressure transmitter. Only the pressure transmission path is slightly different. The measurement diaphragm chamber of the transmitter is connected with a stainless steel capillary (tube with a diameter of about 3mm, plus protection) and the channel is several meters to tens of meters. One of the other places will be two (pressure or differential pressure) made into a flange-shaped measuring diaphragm box. The middle is filled with the transfer medium (silicone oil). When using, connect the flange to the device to measure.
When using Differential pressure (DP) level transmitter to measure the liquid level as shown in the figure below. The measured liquid density in the figure is ρ. The working medium density in the capillary of the double flange differential pressure transmitter is ρ0. The measuring range of the measured liquid level is H. The center distance of the sampling tube of the measured liquid level is h. It can be seen from the figure that the maximum measurement range of the liquid level △ P = P + —P- = H × ρ × g-h × ρ0 × g.
It can be seen from the formula that the dual-flange differential pressure transmitter should perform negative migration. The migration amount S is h × ρ0 × g. And the installation position of the double flange differential pressure transmitter has no effect on the migration amount and the measurement result.
The dual-flange differential pressure transmitter requires negative migration.
When the measured liquid level is 0, the pressure difference between the positive and negative measurement chambers of the remote differential pressure transmitter is the largest. The output current of the double flange differential pressure transmitter is 4mA.
As the measured liquid level rises, the pressure difference between the positive and negative measurement chambers of the transmitter gradually decreases.
When the measured liquid level rises to the highest Hmax. The pressure difference between the positive and negative measurement chambers of the transmitter is the smallest. The output current of the double flange differential pressure transmitter is 20mA.
How to calibrate differential pressure transmitter for level
The differential pressure liquid level transmitter has been calibrated in the range, accuracy, linearity and other parameters according to customer requirements at the factory. And mark the range, accuracy, etc. on the nameplate of the differential pressure liquid level transmitter. As long as the density and other parameters of the measured medium meet the requirements of the nameplate, generally no adjustment is required.
If the customer needs to adjust the range or zero position, please adjust according to the following methods. Assuming that the range of the differential pressure liquid level transmitter is 0 ~ 10 meters:
How to calibrate a differential pressure level transmitter ?
Unscrew the protective cover of the differential pressure liquid level transmitter. It can be adjusted by connecting external standard 24VDC power supply and ammeter (requires accuracy of 0.2% or above).
When there is no liquid in the differential pressure liquid level transmitter. Adjust the zero potentiometer. Make it output current 4mA.
Pressurize the differential pressure liquid level transmitter to full scale (10 meters). Adjust the full-scale resistor. Make it output current 20mA.
Repeat the above steps two or three times until the signal is normal.
Please input 25%, 50% and 75% signals to check the error of the differential pressure liquid level transmitter.
For non-aqueous media. Differential pressure level transmitters are calibrated with water. It should be converted according to the pressure generated by the actual density of the medium. For example, when the medium density is 1.3, the 1.3m water level should be used to calibrate the 1m range.
After adjustment, tighten the protective cover.
The verification cycle of the differential pressure liquid level transmitter is once a year.
What is the difference between pressure transmitter and differential pressure transmitter?
The principle of the pressure transmitter is: The medium pressure acts directly on the sensitive diaphragm. A Wheatstone bridge composed of resistors distributed on the sensitive diaphragm. The use of the piezoresistive effect realizes the conversion of pressure into an electrical signal. Amplify the millivolt signal generated by the sensitive element through an electronic circuit into an industrial (such as 4 ~ 20mA, 0 ~ 5V) standard signal. But the pressure transmitter has only one pressure interface.
Pressure transmitters
The principle of a differential pressure transmitter is: a transmitter that measures the pressure difference between the two ends of the transmitter. Output standard signals (such as 4 ~ 20mA, 0 ~ 5V). Differential pressure transmitters are different from general pressure transmitters in that they have two pressure interfaces. Differential pressure transmitters are generally divided into positive pressure end and negative pressure end. H is the positive pressure end and L is the low-pressure end. In general, the pressure at the positive pressure end of the differential pressure transmitter should be greater than the pressure in the negative pressure section to measure. Differential pressure transmitters are used to measure the level, density, and pressure of liquids, gases, and vapors. Then convert it into 4–20mA DC current signal output.
In summary: The fundamental difference between a pressure transmitter and a differential pressure transmitter is that the pressure transmitter can only measure the pressure at one pressure end. The differential pressure transmitter can measure the pressure at two pressure points, and the two pressures are subtracted. The pressure difference at the positive pressure end minus the negative pressure end pressure. Thus, the actual liquid level value is converted.
Sino-Instrument (drurylandetheatre.com) offers over 100 DP transmitters for liquid level, pressure, flow, temperature measurement. Differential pressure (DP) level transmitters suit to measure water and another liquid level.
A wide variety of DP-level transmitters are available to you. Such as SMT3151LT Differential pressure level transmitter.
You can also choose from the liquid flow meters and pressure transmitters, not specified. We are a differential pressure level transmitter supplier, located in China. The top supplying country is China(Mainland), which supply 100% of DP transmitters respectively.
Differential pressure level transmitter is most popular for India, Pakistan, South Africa, The US. The quality is the same as the original premium quality. You can ensure product safety by selecting from our products, including IOS9000, … certification. You can find more information about our SMT3151LT DP Level transmitter, you can refer to our differential pressure level transmitter pdf:
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.
