Widely Used of Pressure Sensor and Wiring
Pressure sensors are the most commonly used sensors in industrial practice. They are widely used in various industrial automation environments, involving water conservancy and hydropower, railway transportation, intelligent building, production control, aerospace, military, petrochemical, oil, electricity, , Pipelines and many other industries, the following brief introduction to some commonly used sensor principle and its application.
Sensor wiring has always been the customer procurement process consulting one of the most problems, many customers do not know how to connect the sensor, in fact, a variety of sensor wiring are basically the same, the pressure sensor is generally two-wire system, three-wire system, Four-wire system, and some five-wire system.
Pressure sensor two-wire system is relatively simple, the general customers know how wiring, a line to connect the power positive, another line is the signal line through the instrument connected to the power supply negative, this is the most simple; pressure sensor three-wire system is in two Line system based on the addition of a line, this line directly connected to the negative power supply, more trouble than the two lines. Four-wire pressure sensor is certainly two power input, the other two are signal output. Four-wire system is mostly the output voltage instead of 4 ~ 20mA output, 4 ~ 20mA called the pressure transmitter, the majority made of two-wire system. Pressure sensor signal output is not amplified, full-scale output only tens of millivolts, and some pressure sensor in the internal amplifier circuit, full-scale output of 0 ~ 2V. As for how to receive the display instrument, depends on how much the instrument range is, if there is and the output signal to adapt to the stalls, you can directly measure, or to increase the signal to adjust the circuit. Five-wire pressure sensor and the four-line system is not much difference, the market five-wire sensor is also less.
Ceramic pressure sensor based on the piezoresistive effect, the pressure directly on the front surface of the ceramic diaphragm, the diaphragm has a small deformation, thick film resistance printed on the back of the ceramic diaphragm, connected into a Wheatstone bridge, due to varistor The voltage of the bridge is proportional to the pressure, and the voltage is proportional to the voltage. The standard signal is scaled to 2.0 / 3.0 / 3.3mV / V depending on the pressure range. Strain sensors are compatible.
2,the proliferation of silicon pressure sensor:
The working principle of the diffusion silicon pressure sensor is also based on the piezoresistive effect. Using the piezoresistive effect principle, the pressure of the measured medium acts directly on the diaphragm of the sensor (stainless steel or ceramic), so that the diaphragm produces a micro displacement proportional to the medium pressure, So that the resistance of the sensor changes, the use of electronic circuits to detect this change, and convert the output of a corresponding to the pressure of the standard measurement signal.
Piezoelectric effect is the main working principle of piezoelectric sensors, piezoelectric sensors can not be used for static measurement, because after the external force of the charge, only when the loop has an infinite input impedance to be saved. The actual situation is not the case, so this determines that the piezoelectric sensor can only measure dynamic stress.
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