Capacitive pressure transmitter features description

Capacitive pressure transmitters use a simple, rugged, and extremely stable variable capacitor. The variable capacitor consists of a diaphragm on the pressure chamber and an insulated electrode attached to it. When pressure changes are felt, The diaphragm is subject to slight warpage, which changes the spacing between the two poles. A unique detection circuit is used to measure small changes in capacitance, and linear processing and temperature compensation are performed. The sensor outputs a DC voltage or current signal proportional to the measured pressure. The combination of compact construction, high-performance materials and advanced inspection circuitry gives the Capacitive Pressure Transmitter a high performance.
What are the characteristics of capacitive pressure transmitters:

1. High output signal: The circuit of the pressure transmitter can directly convert small changes of capacitance into high output signals without signal amplification. The piezoresistive sensor (thin mode, C type) has low output signal and is susceptible to external signals. Disadvantages, such as interference, and this is usually the main reason for poor sensor stability, large temperature impact, and susceptible to electromagnetic interference.

2. Long-term stability: Pressure transmitters have higher stability than other similar products. Unlike other sensors such as metal strain gauge sensors, the creep pressure, aging and temperature effects of capacitive pressure transmitters are very high. small. Almost all unfavorable factors have less impact on the stability of capacitive sensor output than other forms of sensors. The zero point stability of the pressure transmitter can reach 0.05% FS/year.

3. Mechanical deformation: a small change in the spacing of the sensitive capacitor plate can produce a measurable voltage signal change. The small mechanical deformation greatly reduces the hysteresis and non-repetition error of the sensor, and the speed of the sensor is also greatly improve.

4. Wide measuring range: The pressure transmitter has a wide measuring range, which can accurately measure the pressure in the range of 25Pa to 70MPa and has high stability.

5. High performance: The capacitor material used to make the transmitter has extremely stable physical and chemical properties, which makes the product have extremely high performance. Sensors with an accuracy of ± 0.02% FS have a stability better than ± 0.05% FS. Such high performance is difficult to achieve with other sensitive principles.