Pressure transmitter thermal flow switch

The BD121-037 series pressure transmitter has a small volume, high accuracy, and good long-term stability. It is a commonly used sensor in industrial practice, which has a wide range of applications

Used in various industrial automation environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, petrochemicals, oil wells, electricity, ships, machine tools, pipelines and many other industries.

The main function of a pressure transmitter is to transmit pressure signals to electronic devices, and then display pressure on a computer. The principle is roughly to convert the mechanical signal of water pressure into electronic signals such as current (4-20mA). The pressure and voltage or current are linearly related, generally proportional. Therefore, the voltage or current output by the transmitter increases with the increase of pressure, resulting in a relationship between pressure and voltage or current. The two pressures of the measured medium of the pressure transmitter are introduced into the high and low pressure chambers, and the pressure in the low pressure chamber is atmospheric pressure or vacuum, acting on the isolation diaphragms on both sides of the δ element (i.e. sensitive element), and transmitted to both sides of the measuring diaphragm through the isolation diaphragms and the filling liquid inside the element.

A pressure transmitter is composed of a measuring diaphragm and electrodes on both sides of the insulating film, each forming a capacitor. When the pressure on both sides is not equal, it causes displacement of the measuring diaphragm, and the displacement is proportional to the pressure difference. Therefore, the capacitance on both sides is unequal, which is achieved through oscillation and demodulation.