The wiring method of the temperature and humidity transmitter is slightly different from that of other transmitters, and the current output, voltage output and RS485 digital signal output of the temperature and humidity transmitter are all four-wire system. The red line is the positive power supply, the blue line is the negative power supply, the yellow line is the temperature, and the white line is the humidity.

Temperature and humidity transmitter with current output: The temperature and humidity transmitter with current output type is a two-way four-wire system.

Voltage output temperature and humidity transmitter: The temperature and humidity transmitter of the voltage output type is a two-way four-wire system.

RS485 digital signal output transmitter: for the standard MODBUS communication protocol, the red line is connected to the positive power supply, the blue wire is connected to the negative power supply, the yellow line of temperature and the white wire of humidity are connected to the acquisition equipment.

Temperature and humidity transmittersIt adopts high-precision temperature and humidity integrated chip. Humidity is measured by the characteristics of the diode temperature sensing P-N junction, and the forward voltage drop varies with temperature under constant current. Humidity is measured by the characteristics of moisture-sensitive capacitance, which changes with the change of humidity and capacitance value. Temperature and humidity compensate each other and are then amplified into standard digital and analog signals of relative humidity and temperature by means of amplification circuitry. It should be noted that the temperature and humidity transmitter must be effectively grounded, please read the manual carefully before using the temperature and humidity transmitter to ensure that the wiring is correct, any wrong wiring may cause irreversible damage to the transmitter.

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