The pressure transmitter is one of the most commonly used sensor in industrial practice, which is widely used in various industrial control environment, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil, electric power, shipbuilding, machine tools, plumbing and other industries. Following a brief introduction of some commonly used pressure transmitter, pressure transmitter and its application principle for the measurement of liquid, gas or steam liquid level, density and pressure, and the pressure signal into DC signal output from 4 to 20mA.
The pressure transmitter is mainly composed of a capacitive pressure transmitter, a diffused silicon pressure transmitter, a ceramic pressure transmitter, a strain type pressure transmitter, etc.. The pressure transmitter can be divided into three types: the general pressure transmitter (0.001MPa ~ 35MPa) and the differential pressure transmitter (0 ~ 1.5kPa).
The main function of pressure transmitter converts the pressure signal to the electronic equipment, and in the computer displays the principle is roughly: mechanical signal transformation pressure this pressure into current (4-20mA) such pressure and voltage or current size of electronic signal into a linear relationship is generally proportional to. So, the transmitter output voltage or current increases resulting in a medium to be measured between pressure transmitter pressure and voltage or current of the two kinds of pressure in the high and low pressure chamber two with increasing pressure, the low pressure chamber pressure by atmospheric pressure or vacuum in δ element (i.e. sensitive element). Both sides of the isolation membrane, by filling liquid on both sides is transmitted to the measuring diaphragm and the element in isolation.
The utility model relates to a pressure transmitter, which is composed of a measuring diaphragm and an electrode on both sides of the insulating sheet. When the two sides of the pressure is inconsistent, resulting in the displacement of the diaphragm, the displacement and the pressure difference is proportional to the capacitance on both sides are not, through the oscillation and demodulation.
