Pressure transducer is the most commonly used pressure sensor in industrial, and it is widely used in various industrial field, including water conservancy and HVAC, railway transportation, AI, production automation, aerospace, military, petrochemical, railway, machine tools, etc.
There are two types of pressure transducers: electric and pneumatic. The unified output signal of the electric type is a direct current signal such as 0-10mA, 4-20mA or 1-5V. The pneumatic unified output signal is a gas pressure of 20-100Pa.
Pressure transducers can be divided into force (torque) balanced type, capacitive type, inductive type, strain type and frequency type according to different conversion principles. The following briefly introduces the principle, structure, and structure of several pressure (differential pressure) transmitters. Knowledge of usage, maintenance and calibration.
The main function of the pressure transducer is to transmit the pressure signal to the electronic device, and then display the pressure on the computer. The principle is roughly: the mechanical signal of the pressure of the water pressure is converted into the electronic signal pressure and voltage or the current (4-20mA). The current has a linear relationship, generally a proportional relationship. Therefore, the voltage or current output by the transducer increases with the increase in pressure, and a relationship between pressure and voltage or current is obtained. The two pressures of the measured medium of the pressure transducer enter the high and low pressure chambers. , The pressure in the low-pressure chamber adopts atmospheric pressure or vacuum, which acts on the isolation diaphragms on both sides of the δ element (ie the sensitive element), and is transmitted to both sides of the measuring diaphragm through the isolation sheet and the filling liquid in the element.
The pressure transducer is composed of a measuring diaphragm and the electrodes on both sides of the insulating sheet to form a capacitor. 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 capacitances on both sides are not equal, through the oscillation and demodulation links.
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