What is the pressure transmitter？
Pressure transmitter is a device that converts pressure into pneumatic signal or electric signal for control and remote transmission.
Pressure transmitter is the most commonly used sensor in industrial practice, and it is widely used.
Used in various industrial automation environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil well, electric power, ships, machine tools, pipelines and many other industries.
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 following briefly introduces the principle, structure, and structure of several pressure (differential pressure) transmitters. Knowledge of use, maintenance and calibration.
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 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 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 of 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.
