The top ten brands of pressure transmitters in 2021 were selected based on brand evaluation and sales. The top ten are China Electronics Technology CETC, Yokogawa, Honeywell/Honeywell, and STMicroelectronics Semiconductors, Bosch/BOSCH, ZEMIC, SICK, Dunan Environment, Mike Sensing, Tianshui Huatian.
Pressure transmitter is a device that converts pressure into pneumatic signals or electric signals for control and remote transmission.
It can convert physical pressure parameters such as gas and liquid sensed by the load cell sensor into standard electrical signals (such as 4~20mADC, etc.) to supply indicating alarms, recorders, regulators, etc. Secondary instruments measure, indicate and regulate processes. Pressure transmitter is the most commonly used sensor in industrial practice. It is widely used in various industrial automatic control environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military industry, petrochemicals, oil wells, electric power, and 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 DC signal such as 0~10mA, 4~20mA or 1~5V. The unified output signal of the pneumatic type is a gas pressure of 20 to 100Pa.
Pressure transmitters can be divided into force (torque) balance type, capacitive type, inductive type, strain type and frequency type according to different conversion principles. The following is a brief introduction to several types of pressure (differential pressure) transformers. Knowledge of the principle, structure, use, maintenance and calibration of transmitters.
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: convert the mechanical signal of water pressure into a current (4-20mA) like this The electronic signal pressure has a linear relationship with the voltage or current, which is generally proportional. Therefore, the voltage or current output by the transmitter increases as the pressure increases. This leads to a relationship between pressure and voltage or current. The two pressures of the measured medium of the pressure transmitter pass into the high and low pressure chambers. , the low-pressure chamber pressure 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 plate and the filling liquid in the element.
The pressure transmitter is a capacitor composed of a measuring diaphragm and electrodes on both sides of the insulating sheet. When the pressure on both sides is inconsistent, the measuring diaphragm will be displaced, and the displacement is proportional to the pressure difference, so the capacitance on both sides will be unequal, through the oscillation and demodulation links.