The temperature and humidity transmitter adopts a high-precision temperature and humidity integrated chip, and the temperature is measured by using the characteristics of the diode temperature sensing P-N junction under constant current forward step-down with temperature. Humidity is measured by the characteristics of the change of the humidity sensitive capacitor with the change of the capacitance value. Temperature and humidity compensate each other and are then amplified into standard digital or analog signals of relative humidity and temperature by amplification circuitry. Temperature and humidity transmitter in the process of use due to misoperation or special conditions on the site, resulting in the temperature and humidity transmitter can not be used normally, some common failures are mainly two: the first temperature and humidity transmitter no signal output, second, temperature and humidity transmitter output data has errors. Temperature and humidity transmitter without signal output: When used on site, the control instrument, PLC, industrial computer, control board, etc. do not receive the relevant signals of the temperature and humidity transmitter. If such a phenomenon occurs, the following aspects should be examined. First of all, it is necessary to confirm whether the temperature and humidity transmitter is powered by electricity. If there is still no signal after power supply, check whether the wiring of the temperature and humidity transmitter is correct. The four wires can be removed to measure the voltage/current output of the temperature signal and humidity signal separately with a multimeter. Refer to the wiring diagram in the temperature and humidity transmitter manual to correctly wire the temperature and humidity transmitter. Temperature and humidity transmitter output data has errors: There are two main manifestations of this fault: first, the temperature and humidity transmitter signal jumps irregularly; Second, the output of the temperature and humidity transmitter does not match the measurement. This kind of fault must first confirm whether the temperature and humidity transmitter signal transmission cable is properly selected, and when long-distance transmission requires the selection of multi-core cable with shielding effect, and the shielding layer is grounded. Secondly, incorrect use of the supply voltage of the temperature and humidity transmitter will also lead to errors in the output data. The power supply voltage used by the temperature and humidity transmitter should be 9~36VDC. Product consultation, product customization, agent, technical inquiry, quotation, etc. If you have any questions, please contact Xingyi: 400-600-4496!