Capacitive pressure sensor

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Engine oil pressure sensor

Measure the engine oil pressure, transmitted to the ECU and then to the oil pressure gauge screen; when the pressure ...
1 to 3 weeks

What is a capacitive pressure sensor?

The capacitive pressure sensor made of ceramic material is used for its recognized characteristics of elasticity, corrosion resistant, shock, shock and vibration resistant. Its thermal stability can reach a working temperature of -40 to 135 ° C. In addition, it has high measuring accuracy, high stability, and overload capacity can reach up to 100 times the measuring range of other types of sensors. GUILCOR capacitive ceramic pressure sensor combines advanced material with thick film, thin film, low temperature ceramic.

The capacitive element is a ceramic sensor with parallel plates. The electrodes in the diaphragm and the substrate are reprinted with an organometallic paste, the two elements are sealed together with a glass paste, this glass paste creates a hermetic effect. When pressure is applied to the diaphragm surface (active area), it deforms, which results in a change in capacity. The variation in capacity has a relationship proportional to the value of the pressure. The diaphragm will not be damaged even if it came into contact with the substrate in the event of overload. Once the pressure has returned to normal, its performance will not be affected. Its design considerably increases the overload capacity of the sensor.

It is an improved version of the diffusion pressure silicon sensor. The sensor has high temperature and time stability and can come into contact with most media directly. Once the ceramic capacitive pressure sensor is assembled, it will be calibrated by ASIC to ensure the output voltage or pulse precision of the width modulation to reach the defined standard under a specific pressure. Capacitive ceramic pressure sensor without liquid transmission and without filling liquid. Most importantly, it will not produce process-related pollution. And due to its high precision and reliability, having these characteristics, it is widely used in the fields of food, medicine, refrigeration, automotive and any other industry.

Flowsheet
Working principle of pressure sensor

Understand performance specifications

The accuracy of the sensor is specified in different ways to help you find the best sensor for a particular application. Specifications include accuracy (static and total error band), linearity, hysteresis, repeatability, calibration and temperature.


Precision

The term accuracy has many different definitions. The most commonly accepted is that it is the sum of the errors due to linearity, hysteresis and repeatability at room temperature. Some manufacturers use the square of the sum of the roots of these three sources of error. Presented as a percentage of range (% span written and also% FS is the abbreviation for full span). The range on the pressure axis is the total pressure range of a device (for example, for a device from 0 to 100 psi, it is 100 psi; for a device from 200 to 500 psi, it is 300 psi). The range on the output axis of the device corresponds to the full scale output range (for example, for a device from 0,5V to 4,5V, it is 4,0V).


Linearity (or non-linearity)

Linearity is the maximum deviation of the sensor output from a straight line of best fit (BFSL) measured only with increasing pressure. It is typically expressed in ± x% FS. A typical linearity error is illustrated in Figure 5.

Pressure probe linearity diagram


Hysteresis

Hysteresis maximum difference in sensor output at a pressure when this pressure is first approached when the pressure increases, then approached when the pressure decreases during a full range pressure cycle. It is indicated as less than x% FS. A hysteresis error is illustrated in Figure 6.

Diagram of the hysteresis of the pressure probes


Repeatability

Repeatability is the maximum output difference when the same pressure is applied, consecutively, under the same conditions and approaching from the same direction. Repeatability is determined by two pressure cycles and is reported to be less than x% FS. The repeatability error is illustrated in
Figure 7.

Repeatability diagram of pressure sensors

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