In many industrial applications, various non-electrophysical quantities need to be measured, such as temperature, humidity, pressure, velocity, angle, etc. The transmitter is the main device that converts physical quantities into electrical signals. The most widely used current in the industry is 4~20mA to transmit analog quantities. The current signal transmission is not easy to be disturbed, and the current internal resistance is infinite, and the wire resistance is connected in series in the loop without affecting the accuracy. On an ordinary twisted pair cable, hundreds of meters can be transmitted. The upper limit of 20mA is due to the requirements of explosion-proof, and the spark energy caused by the current interruption of 20mA is not enough to ignite the gas. In the process of using the pressure transmitter, if the pressure transmitter output ≥ 20mA, what should we do? First, check whether the power supply of the pressure transmitter is normal. If the pressure transmitter power supply is less than 12VDC, it should be checked for large loads in the circuit, and the input impedance of the transmitter load should be in accordance with the RL≤ (transmitter supply voltage -12V)/(0.02A) Ω Second, confirm whether the actual range of the site exceeds the selected range of the pressure transmitter. If the pressure transmitter range is a problem, it is necessary to re-select the pressure transmitter with the appropriate range. Third, verify whether the pressure transmitter is damaged. Improper use in the field or severe overload can sometimes damage the pressure transmitter, which requires the pressure transmitter to be sent back to the original factory for testing and repair. Fourth, check whether the wiring of the pressure transmitter is connected. The pressure transmitter is not tightened at the wiring, and the wiring is not accurate. Fifth, whether the power wiring of the pressure transmitter is correct. Check that the pressure transmitter power cord is connected to the appropriate binding post. If you have any questions about product consultation, product customization, agency, technical inquiry, quotation, etc., please contact Xingyi: 400-600-4496!