Monocrystalline Silicon Pressure Transmitter 0.05%FS Accuracy / 4-20mA

The core of the single-crystal silicon pressure transmitter is the single-crystal silicon diaphragm. A Wheatstone bridge is formed on the diaphragm through microelectronic technology. When the medium pressure is transmitted to the silicon chip through the isolation diaphragm and the filling fluid, the deformation of the chip causes a change in resistance. The bridge outputs a voltage signal proportional to the pressure. After amplification, compensation and linearization processing, a standard electrical signal is output.

Single crystal silicon pressure transmitter is a kind of industrial pressure measuring instrument with high precision and high stability. It is widely used in fields such as petroleum, chemical, power, metallurgy, environmental protection, water supply, heat network, oil and gas transmission, etc., for the measurement of pressure, liquid level, density and flow of liquids, gases or steam.

1. High Precision and Stability: Utilizing single-crystal silicon chips as sensitive components and taking advantage of piezoresistive effects, the measurement accuracy can reach 0.05%FS or even higher. It features excellent long-term stability and strong anti-interference capabilities.
2. Strong Overload Capacity and Wide Temperature Adaptability: Generally, it can withstand overload pressure up to twice the full scale. It has a wide operating temperature range (medium temperature -40 to 120℃, ambient temperature -40 to 85℃), and employs temperature compensation technology to minimize temperature drift.
3. Compact Structure and Easy Installation: Small in size and light in weight, it supports various thread interfaces and explosion-proof designs, making it suitable for complex and harsh industrial environments.
4. Signal Output and Communication: The standard output is a 4-20mA current signal, with HART protocol superimposed, enabling remote parameter setting and process control.

1. Sensor material: Single-crystal silicon transmitters use nano single-crystal silicon chips, while ordinary transmitters commonly use metal capacitors or diffused silicon. Single-crystal silicon is superior in terms of accuracy, stability, and interference resistance.
2. Performance: Single-crystal silicon transmitters have a faster response, higher linearity, and are less affected by temperature, making them suitable for high-precision applications.

• Industrial process control: such as oil pressure and air pressure monitoring, liquid level measurement, etc.
• Energy and environmental protection: pressure monitoring of power equipment, environmental gas detection, etc.
• Special fields: high-precision demand scenarios such as aerospace and medical equipment.

The strain gauge pressure transmitter is a pressure measurement instrument based on the "strain effect" principle, widely used in industrial automation, process control, scientific research and other fields. It converts the measured pressure into changes in resistance value through elastic sensitive elements and resistance strain gauges, and then the measurement circuit converts the resistance changes into standard electrical signals (such as 4-20mA, 0-5V, etc.) for output, achieving precise pressure measurement.

The core principle of a strain gauge pressure transmitter is the "strain effect": when pressure is applied to an elastic element (such as a metal diaphragm or strain tube), the elastic element undergoes a slight deformation. The resistance strain gauge attached to it also deforms, resulting in a change in resistance value. The resistance change is detected by a Wheatstone bridge and converted into a voltage or current signal proportional to the pressure, which is ultimately output as a standard industrial signal.

• High precision and stability: The accuracy is usually up to 0.1% to 0.5% FS, with good long-term stability, making it suitable for precise measurement.
• Wide measurement range: It covers from -100 kPa to 160 MPa, and is applicable to various measurement methods such as gauge pressure, absolute pressure, and sealed gauge pressure.
• Strong anti-interference ability: It is resistant to vibration and shock, supports reverse polarity protection and overvoltage protection, and is suitable for harsh industrial environments.
• Compact structure and flexible installation: It is small in size and light in weight, supports multiple electrical connections and pressure interfaces, and is easy to integrate.
• High cost performance: Compared with high-end transmitters such as single-crystal silicon, it has a lower cost and is suitable for applications with limited budgets.

• Industrial process control: Pressure monitoring of pipelines and storage tanks in fields such as petroleum, chemical engineering, power, and metallurgy.
• Machinery and equipment: Hydraulic systems, pneumatic control, engine testing, etc.
• Research and medical: Pressure measurement in laboratories, fluid pressure monitoring in medical equipment.
• Special environments: High temperature, low temperature, corrosive media (anti-corrosion type is required).

• Select based on medium: For corrosive media, choose anti-corrosion types (such as PVDF material).
• Confirm output signal: Commonly used are 4-20mA (two-wire system) or 0-5V/0-10V (three-wire system) [13].
• Environmental adaptability: For high/low temperature scenarios, pay attention to the working temperature range (such as -40 to 120℃).
• Explosion-proof requirements: In hazardous environments, select explosion-proof certified models (such as intrinsically safe types).