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Through a certain design structure or installation as required, the sensor converts the change of the difference between the front and rear pressure into the change of the built-in pressure sensitive element, and then processes and modulates the weak signal generated by the deformation of the pressure sensitive element or outputs an analog signal or a digital signal through analog-to-digital conversion and chip operation.
working principle
The two kinds of pressure of the measured medium of the pressure transmitter are connected to the high and low pressure chambers, which act on the δ On the isolating diaphragms on both sides of the element (i.e., the sensing element), it is transmitted to both sides of the measuring diaphragm through the spacer and the filling liquid in the element. The measuring diaphragm and the electrodes on the insulating sheets on both sides form a capacitor respectively.
When the pressures on both sides are inconsistent, the measuring diaphragm will be displaced, and the displacement is proportional to the pressure difference, so the capacitance on both sides will be unequal, and it will be converted into a signal proportional to the pressure through the oscillation and demodulation links. Then, the modulated current is obtained by signal modulation. The A/D converter converts the current of the demodulator into a digital signal, and its value is used by the microprocessor to determine the input pressure value. The microprocessor controls the operation of the transmitter. In addition, it performs sensor linearization, reset measurement range, engineering unit conversion, damping, square root, sensor trim and other operations, as well as diagnosis and digital communication. So as to display and control.
Application occasions
Differential pressure transmitters are widely used in industrial process control, flow measurement, medical instruments, aerodynamic measurement, hydraulic, pneumatic equipment and other fields.
Principle and Application of Differential Pressure