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Principle of pressure transmitter

by:Rika Sensors     2021-11-25
Pressure transmitter is a commonly used sensor in industrial practice. It is used in various industrial automation environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, electricity, ships, Many industries such as machine tools and pipelines.

There are two types of pressure transmitters: 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 transmitters can be divided into force (torque) balanced type, capacitive type, inductive type, strain type and frequency type according to different conversion principles. The principles of several pressure (differential pressure) transmitters are briefly introduced below. , Structure, use, maintenance and calibration knowledge. [2]

The main function of the pressure transmitter 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 of the electric current (4-20mA) It has a linear relationship with the voltage or current, and it is generally proportional. Therefore, the voltage or current output by the transmitter 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 transmitter 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 transmitter 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.

CO1 series carbon monoxide transmitter, using high-precision environmentally friendly electrochemical sensor elements, with high-performance digital technology, so that the product has

High detection accuracy, good long-term stability, etc. It can provide a variety of power supply methods and output signals. Users can also configure LCD display according to their needs.

Apply to various types of civil air defense facilities, underground pipe corridors, underground garages, stations, operating rooms, laboratories, electronic factories and other intelligent building environments.

Measurement and control of CO concentration, monitoring ventilation system, effectively reducing energy consumption.



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