What are the main characteristics of capacitive pressure transmitter?

The pressure transmitter mainly consists of three parts: pressure sensor (also called pressure sensor), measuring circuit and process connector. It can convert the physical pressure parameters such as gas and liquid sensed by the pressure sensor into standard electrical signals (such as 4~20mADC, etc.), which can be supplied to secondary instruments such as indicator alarm, recorder and regulator for measurement, indication and process adjustment.

1. High output signal: The circuit of the pressure transmitter can directly convert the slight change of capacitance into a high output signal without signal amplification, and the piezoresistive sensor (thin mode, type C) has the disadvantages of low output signal and is easily disturbed by external signals, which is usually the main reason why the sensor is poor in stability, greatly influenced by temperature and easily disturbed by electromagnetic waves.

2. Good long-term stability: Compared with other similar products, the pressure transmitter has higher stability. Unlike other sensors such as metal strain sensors, the creep, aging and temperature effects of capacitive pressure transmitter are very small. Almost all unfavorable factors have less influence on the output stability of capacitive sensors than other types of sensors. The zero point stability of pressure transmitter can reach 0.05%FS/ year.

3. Mechanical deformation: a small change in the distance between the plates of the sensitive capacitor module can produce a measurable change in voltage signal. Small mechanical deformation greatly reduces the hysteresis and non-repetitive error of the sensor, and at the same time, the speed of the sensor is greatly improved.

4. Wide measuring range: Our pressure transmitter has a wide measuring range, which can accurately measure the pressure in the range of 25 Pa ~ 70 MPa and has extremely 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. The sensor with an accuracy as high as 0.02% fs has a better stability than 0.05% fs, and such a high performance is difficult to achieve by products adopting other sensitive principles.

What are the reasons and solutions for inaccurate measurement of pressure transmitter?

Causes and solutions of inaccurate measurement of pressure transmitter

The display screen of the pressure transmitter is not displayed? It can be judged that the instrument may have loose cable and open circuit. For different DCS control systems, when the cable is disconnected in the field, the indication of the corresponding point of the process will have different forms of expression. Can be judged according to different tips. In this way, it is necessary to check the cables from the terminal cabinet to the field junction box and the transmitter point by point. If there is no problem above, you can call the after-sales contact for replacement and maintenance.

Is there a big deviation between the indicating end and the display end? You can contact the technical department first to check whether the zero point of the transmitter is correct. If the zero point of the transmitter drifts, you need to reset the zero point of the transmitter. And the transmitter is suppressed and verified to check whether the output of the transmitter is linear and intact. If there is no problem above, you can call the after-sales contact to exchange and repair the pressure transmitter.

The pressure indication of the pressure transmitter is unstable and fluctuates greatly. Turn off the pressure of the transmitter and turn on the discharge at the scene to see if the transmitter shows zero point. If the zero point is displayed, there is no problem in the measurement of this transmitter, so it is necessary to check the cable from the transmitter to the DCS cabinet to see whether the shielding of the branch cable and the main cable is intact. This phenomenon is usually caused by the broken shielding wire or the virtual connection at the cable connection and the poor contact caused by the oxidation of the exposed cable core. The shielding is not good, and there is a lot of electromagnetic interference in its environment, and such fluctuations are also serious. If there is no problem above, you can call the after-sales contact to exchange and repair the pressure transmitter.

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