Specification of Indoor Temperature and Humidity TransmitterLFH20

Technical parameter

LEFOO Indoor Temperature and Humidity Transmitter LFH20
Relative Humidity
Sensor	Digital type
Range	0%~100%RH
Output	RS485/Modbus,0~10VDC, 4~20mA optional
Accuracy	±3%@ 20℃ & 20~80%RH
Response time	≤10s(25℃, slow flow air)
Temperature
Sensor	Digital or RTD, refer to selection table
Range	0~50℃, -20~60℃, etc
Output Signal	4~20mA,0~10VDC, RS485/Modbus optional
RTD(thermal resistor)	Refer to the selection table and RTD indexing table
Accuracy	Digital sensor: ±0.3℃@20℃ ; RTD: Typical ±0.2~0.4℃@25℃, refer to selection table
Power Supply	Voltage type/485 type 15~35VDC/24VAC±20% ; Current type 19.5~35VDC (RL=500Ω)/9.5~35VDC (RL=0Ω)
Output Load	≤500Ω(current type), ≥2KΩ(voltage type)
Display	Optional LCD display with unit display and backlight (4~20mA without backlight)
Shell Material	PC
Working Environment	-20~60℃, 5%-95%RH(non-condensing)
Protection Class	IP30

Code and Description							Remark
LFH20	Indoor Temperature Humidity Sensor						Model
	3	±3%RH(±0.3℃)					Accuracy
		A4	4~20mA(Two-wired)				Humidity output
		V10	0~10VDC(Three-wired)
		RS	RS485/Modbus
		N	No output
			A4	4~20mA(Two-wired)			Temperature output
			V10	0~10VDC(Three-wired)
			RS	RS485/Modbus
			0	PT1000，±0.2℃@0℃
			1	PT100，±0.2℃@0℃
			2	NTC20K，±0.4℃@25℃
			3	NTC10K,±0.4℃@25℃
			N	No output
				0	Non		Range
				1	0~50℃
				2	-20~60
				8	Customizable
					0	Without displa	Display
					1	LCD digital display

LFH20	3	A4	A4	1	1		Selection example