Measuring the pressure of high-temperature media can be a challenging task. Sino-Inst offers high-temperature pressure transmitters with a maximum measurement temperature of 1200°C. They operate similarly to conventional pressure transmitters. They can dissipate heat through heat sinks and water circulation.
The post has an introduction to the technical aspects of high-temperature pressure transmitters.
What is a High-Temperature Pressure Transmitter?
A high-temperature pressure transmitter is a pressure measurement device that combines a pressure transmitter with an integrated heat sink or a separate capillary diaphragm pressure guide. It can measure the pressure of high-temperature gases, liquids, steam, and oils.
Read More about: 7 Types of Pressure Sensors: Different Types, Working Principles, and Definitions
Advantages:
- Customization and OEM support;
- Corrosion resistance;
- Radio frequency interference protection;
- Lightning protection;
- High accuracy;
- High stability;
- High reliability;
- Intrinsically safe and explosion-proof.
Disadvantages:
- High cost;
- Slow response time;
- Larger size than conventional pressure transmitters;
- Shorter service life than conventional pressure transmitters.
Read More about: High Pressure Sensors up to 1000Mpa
What is a Cooling Element?
High-temperature pressure transmitters can measure the pressure of high-temperature media primarily. Because they utilize a cooling element. Sino-Inst’s high-temperature pressure transmitters use a heat sink and water circulation.
The heat sink of a high-temperature pressure transmitter is typically made of a metal material with good thermal conductivity. It is attached to the outside of the pressure transmitter or integrated with the circuitry to quickly dissipate heat. The heat sink is located below the electronic components. When heat passes through the heat sink and reaches the electronic components, the temperature is lowered, thus protecting the components. This allows high-temperature pressure transmitters to measure high-temperature media.
Water-cooled high-temperature pressure transmitters primarily utilize a water-cooling structure for cooling. Because these products must meet various user requirements, they typically employ a split-body design. Water-cooling reduces the temperature of the electronic components through water circulation. Water circulation involves connecting two water channels to the pressure transmitter, with water flowing in one channel and out the other. The water’s flow removes some heat, achieving cooling. This structure can extend the service life of the pressure transmitter. And it ensures a more accurate pressure measurement.
High Temperature Pressure Transmitter Working Principle:
A high-temperature pressure transmitter is a commonly used industrial automation instrument. It is used to measure and convert pressure signals in high-temperature environments. Its operating principle is based on thermodynamic effects and electronic sensing technology. It converts pressure in high-temperature environments into an electrical signal. A high-temperature pressure transmitter consists of a sensor, a signal conditioning circuitry, and an output circuitry.
The sensor is responsible for sensing pressure signals in high-temperature environments. It is typically made of a high-temperature alloy with good thermal stability and mechanical strength. The sensor’s internal structure includes a diaphragm or spring. When subjected to pressure, the sensor slightly deforms, generating an electrical signal.
The electrical signal output by the sensor requires further processing and conditioning. Signal processing involves amplifying, filtering, and linearizing the sensor output signal. This process eliminates errors caused by the sensor’s inherent characteristics and environmental interference, while also ensuring signal stability.
After signal conditioning, the output circuit of a high-temperature pressure transmitter converts the electrical signal into a standard industrial signal. such as 4-20mA DC or 0-10V DC voltage. This standard industrial signal is easy to transmit and process. And it can be accepted and used by many automation equipment and control systems.
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High Temperature Pressure Transmitter Precautions
There are some precautions you should take when using a high-temperature pressure transmitter:
- When measuring high-temperature media, a heat sink should be used. This allows the transmitter and pipeline to be connected. And the pressure on the pipeline is transmitted to the transformer.
- During design and installation, the pressure tapping on the bottom of the tank should be positioned as low as possible to eliminate errors caused by temperature fluctuations. Temperature compensation should be implemented if necessary.
- The pressure transmitter body must be kept at room temperature. Do not expose the pressure transmitter body to high temperatures. The maximum temperature it can withstand is 85°C.
- Never apply a voltage higher than 36V to the pressure transmitter, as this may damage the transmitter. Do not touch the diaphragm with hard objects, as this may damage the isolating diaphragm.
High Temperature Pressure Transmitter Applications
Due to their unique structure, high-temperature pressure transmitters can measure the pressure of high-temperature liquids, gases, steam, and oils. They are primarily used in the following measurement industries:
- High-temperature steam pipelines;
- High-temperature vessels such as reactors and polymerization reactors;
- High-temperature melts (such as plastics, rubber, and molten metal);
- Heat transfer oil systems, boilers, and heat exchangers;
- Testing and monitoring high-temperature components such as engines and burners.
Integrated Pressure and Temperature Sensor
Many industries require simultaneous measurement of both temperature and pressure. For example, the petroleum, aerospace, and industrial automation sectors all face these challenges. However, purchasing a single pressure transmitter can increase the budget. Sino-Inst offers integrated pressure and temperature transmitters. They can measure both temperature and pressure simultaneously.
Integrated pressure and temperature transmitters combine the functions of both temperature and pressure sensors. Their design typically adds a temperature probe below the pressure sensor to achieve simultaneous measurement of both parameters.
Integrated pressure and temperature transmitters typically have four-wire outputs, with separate outputs for temperature and pressure signals. This design facilitates installation. Because installation in high-temperature and high-pressure environments requires many considerations,
Integrated temperature and pressure sensors can reduce costs. This makes integrated temperature and pressure transmitters significantly cheaper than the combined price of separate temperature and pressure sensors. Integrated temperature and pressure transmitters offer significant advantages, especially when measuring temperature and pressure at multiple locations along a pipeline. Using separate temperature and pressure sensors would result in the pipeline being cluttered with sensors, and the wiring would be complex.
Sino-Inst Customized Integrated Pressure and Temperature Sensor
We can also customize high-temperature integrated temperature and pressure transmitters. It is capable of measuring pressures up to 650°C. The following are customer-specific parameters for steam measurement, which we can meet. For your reference:
- Pressure Range: 35MPa
- Temperature: 650°C
- Steam Measurement
- RS-485 Signal Output
- Temperature Probe: PT100
- Conventional Threaded Mounting
Sino-Inst Customized High Temperature Pressure Transmitter
A customer needed to measure the pressure of an extremely high-temperature medium. After consulting with numerous suppliers, they were unable to find a suitable supplier. However, we were able to provide a customized solution tailored to their needs. Please refer to this for more information.
1. Pressure Transmitter
- Process Connection: 25DN Flange End, 150# RF
- Wetted Parts (Wetted Materials): Hastelloy C-22
- Ex ia IIC T6 Ga
- Design Temperature: 0 to 750°C
- Operating Temperature: 0 to 650°C
- Pressure: -1 to 1 bar (G)
- Application: Furnace Reactor
- 24VDC Power Supply
2. Pressure Transmitter
- Process Connection: 25DN Flange End, 150# RF
- Wetted Parts (Wetted Materials): Hastelloy C-22
- Ex ia IIC T6 Ga
- Design Temperature: 0 to 450°C
- Operating Temperature: 0 to 400°C
- Pressure: -1 to 3 bar (G)
- Application: Biochemical Tank
- 24VDC Power Supply
3. Pressure Transmitter
- Application: Furnace Reactor Jacket Pipeline
- Process Connection: 1/4″ BSPT Male Connector
- Wetted Parts (Wetted Materials): Hastelloy C-22
- Ex ia IIC T6 Ga
- Design Temperature: 0 to 750°C
- Operating Temperature: 0 to 650°C
- Design Pressure: -1 to 1 bar (G)
- Operating Pressure: -1 to 1 bar (G)
- 24VDC Power Supply
How to measure pressure at high temperatures?
Under high temperature conditions, conventional pressure measurement methods are no longer effective. Therefore, Sino-Inst's high-temperature pressure transmitters are designed specifically for measuring pressure in high-temperature media.
How does temperature affect pressure?
Temperature can cause inaccurate pressure transmitter measurements. Generally, these effects manifest themselves in the following ways:
The housing and internal components of a pressure transmitter are typically made of metal or plastic. These materials expand or contract with temperature fluctuations, potentially causing mechanical stress and gap changes.
Temperature changes can affect the performance of electronic components. such as resistors, capacitors, and semiconductors. These changes can cause signal drift, gain variations, and increased noise. They affect measurement results.
For pressure transmitters measuring liquids or gases, the viscosity of the medium changes with temperature. This change in viscosity can affect the pressure sensor's response time and measurement accuracy. The following temperature compensation techniques can be used to improve measurement precision.
A temperature sensor can be integrated into the pressure transmitter design. Hardware circuitry can be used to compensate for temperature changes. This approach adjusts the output signal offset the effects of temperature changes.
Compensating for temperature changes using a software algorithm is a common approach. This typically involves storing temperature-pressure calibration data in the pressure transmitter's microcontroller. And it adjusts the output signal according to the real-time temperature.
In some cases, environmental isolation can be used to protect a pressure transmitter from temperature changes. For example, using thermal insulation or placing the transmitter in a temperature-controlled environment.
During use, regular calibration is required to maintain measurement accuracy.
What is the temperature limit for a pressure transmitter?
Generally speaking, ordinary pressure transmitters can measure temperatures between -20°C and 85°C. However, Sino-Inst utilizes specialized materials to increase the measurement temperature. Customized temperature transmitters can reach temperatures up to 1200°C.
Sino-Inst’s high-temperature pressure transmitters have been successfully applied in a wide range of industries. Our products have helped many users solve their challenges in measuring the pressure of high-temperature media. If you have similar concerns, please contact us. Sino-Inst’s technical experts are always available to answer your questions.
