Pressure sensor 022500788-933 three-wire system is based on the two-wire system with a wire, this wire is directly connected to the negative pole of the power supply, a little more troublesome than the two-wire system.
Four-wire pressure sensor 022500788-933 must be two power inputs, the other two signal outputs. Four-wire system is mostly voltage output rather than 4~20mA output, 4~20mA called pressure transmitter, most made of two wire system.
Pressure sensor 022500788-933 installation method
1. Correct installation method of pressure sensor:
(1) Verify the frequency response value of the pressure sensor under normal atmospheric pressure and standard temperature conditions through appropriate instruments.
(2) Verify the correctness of the coding of the pressure sensor and the corresponding frequency response signal.
2. Determine the installation position
Working principle of pressure sensor
1. Principle of strain gauge pressure sensor
There are many kinds of mechanical sensors, such as resistance strain gauge pressure sensor, semiconductor strain gauge pressure sensor, piezoresistive pressure sensor, inductive pressure sensor, capacitive pressure sensor, resonant pressure sensor and capacitive acceleration sensor, etc.
The resistance strain gauge is a kind of sensitive device which converts the strain changes on the measured parts into an electrical signal. The most commonly used resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. Usually, the strain gauge is tightly bonded to the mechanical strain matrix through a special adhesive. When the stress of the matrix changes, the resistance strain gauge also deforms, so that the resistance value of the strain gauge changes and the voltage applied to the resistance changes. Typically, such strain gauges form A strain bridge and are amplified by subsequent instrumentation amplifiers and transmitted to processing circuits (typically A/D conversion and CPU) displays or actuators.
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