Pressure Transmitter Principle Application and Calibration and Verification Method The anti-corrosion pressure transmitter has no liquid transfer. The pressure acts directly on the front surface of the ceramic diaphragm, causing the diaphragm to produce a slight deformation. The thick film resistor is printed on the ceramic. The back side of the diaphragm is connected to a Wheatstone bridge (closed bridge). Due to the piezoresistive effect of the varistor, the bridge produces a highly linear voltage signal proportional to the pressure and proportional to the excitation voltage. The signal is calibrated to 2.0 / 3.0 / 3.3 mV / V depending on the pressure range and is compatible with strain gauge sensors. With laser calibration, the sensor has high temperature stability and time stability. The sensor comes with temperature compensation of 0 to 70 Â° C and can be in direct contact with most media.
The principle and application of the diffused silicon pressure transmitter directly on the diaphragm of the sensor (stainless steel or ceramic), so that the diaphragm generates a micro-displacement proportional to the pressure of the medium, so that the resistance value of the sensor changes, and This change is detected by an electronic circuit and converted to output a standard measurement signal corresponding to this pressure.
Principle of Capacitive Pressure Transmitter Capacitive pressure transmitter mainly has a chamber sensitive component that realizes pressure and capacitance conversion and converts the capacitor into a two-wire 4-20mA electronic circuit board! When the process pressure is applied from the two sides (or one side) of the measuring chamber to the isolating diaphragm, it is transferred to the central diaphragm of the chamber through the silicone oil filling liquid, and the central diaphragm is a marginally tensioned diaphragm. Under the action of pressure, a corresponding displacement is generated, which changes the differential capacitance! And through the adjustment, oscillation and amplification of the electronic circuit board! Convert to 4-20mA signal output! The output current is proportional to the process pressure!
Tips for verification and verification of pressure transmitters:
First, we must select the corresponding pressure source according to the non-available and different types of pressure transmitters, and then select the corresponding pressure calibrator or precision digital pressure gauge according to the pressure transmitter being verified. A pressure transmitter with a small range or an oil-free requirement can select a pressure type pressure calibration table. A pressure transmitter with a large range or an oil-free requirement needs to select a water pressure type pressure calibration table. A hydraulic pressure gauge can be selected that is larger and has no other requirements. The standard table can choose MY-YBS-WB digital pressure calibrator, which can be used in one machine and multiple modules, select the appropriate range of pressure modules according to the pressure transmitter to be verified; or choose MY-YBS-C type The precision digital pressure gauge is used as a standard with the appropriate range.
After selecting the equipment, connect the standard meter to the pressure transmitter and the pressure calibration station, and start to suppress. According to the range of the pressure transmitter with the test, take 5 to 10 points, and then boost to the pressure point to be corrected, and compare the pressure transmitter with the standard table. If there is a deviation, adjust the pressure transmitter with a hand-held device or through the meter menu button.
While adjusting the pressure value, it is necessary to calibrate the 4-20 mA current output from the pressure transmitter. When the position is zero, see if the pressure transmitter output signal is 4 mA; when the full scale is 1/2, whether it corresponds to the output. It is 12mA; when it is full scale, whether the corresponding output is 20mA.
This is the entire verification process and method of the pressure transmitter. After correctly mastering the entire process, you can select the appropriate equipment to verify all the pressure transmitters that are used for too long online, so that the measurement reliability can be greatly improved. .
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