Temperature And Humidity Sensor

 

 

 

WH-M temperature and humidity module is mainly used for testing the internal temperature and humidity of medium and high voltage switch cabinet, terminal box, ring main unit, box substation and other equipment.This module adopts special shell, with good ventilation effect, delicate appearance, can effectively protect internal components, improve service life, and facilitate installation and wiring.

 

 

 

 

Technical parameter		Index
Measuring range	Temperature	-40.0℃～80.0℃
	Humidity	20％RH～95％RH
Accuracy	Temperature	±1℃
	Humidity	±5％RH
Communication		RS485, (MODBUS-RTU) protocol
Auxiliary power supply	Voltage	DC 12～24V
	Consumption	≤0.5W
Mean time between failures		≥50000 hour
Environment	Temperature	-40℃～+80℃
	Humidity	≤95％RH,No condensation, no corrosive gas
	Altitude	≤2500 m

 

 

 

 

 

 

The meter uses the Modbus-RTU communication protocol, which defines in detail the check codes, data sequences, etc., which are necessary for specific data exchange.The MODBUS protocol USES a master-slave respond connection (half duplex) on one communication line.When the main computer's signal is addressed to a unique terminal (slave), the terminal sends a reply signal for transmission to the host.

MODBUS protocol only allows communication between the host computer (PC, PLC, etc.) and the terminal device, but does not allow data exchange between independent terminal devices, so that each terminal device will not occupy the communication line during their initialization, but only respond to the query signal arriving on the machine.

 

 

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