Digital Temperature and Humidity Sensor LFH50

Name: Digital Temperature and Humidity Sensor LFH50
Brand: LEFOO INDUSTRIAL CO.,LTD.

The probe of Digital Temperature and Humidity Sensor LFH50 is mainly composed of a temperature-sensitive resistor and a humidity-sensitive capacitor. The resistance value of the temperature-sensitive resistor is proportional to the temperature. The capacitance value of the humidity-sensitive capacitor is related to the surrounding humidity. The higher the humidity, the lower the capacitance value. The core components of the digital temperature humidity sensor LFH10 are the silicon chip and the control circuit. The control circuit will read the changes in resistance and capacitance and the silicon chip will generate 0-5V or RS485 signals. The advantage of the temperature and humidity sensor LFH10 is not consumed power and can still provide real-time and accurate temperature and humidity monitoring even when the power is off.

Feature

* Two outputs Temperature and Humidity

* Anti-interference

* CE and RoHS certificated

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Transmitter

Pump

Specification
Description
Application

Specification of Digital Temperature and Humidity Sensor LFH50

Temperature and Humidity Transmitter
Note: The relative humidity table and temperature table are separate
Relative Humidity		Temperature
Sensing Element	Digital	Sensing Element	Digital or thermal resistance, see Models Selection Table
Measure Range	0%~100%RH	Measure Range	0~50℃, -20~60℃
Output	RS485/Modbus,0~10VDC,4~20mA	Output	4~20mA, 0~10VDC, RS485/Modbus
Response Time	≤10s(25℃， slow flow air)	Work Temperature	-20~60℃,5%-95%RH(non-condensing)
Accuracy	±2%@ 25℃ & 60%RH	Accuracy	Digital sensing element: ±0.5℃@25℃
Model	LFH101 Wall Mounted Type	Voltage Type	RS 485 Type	Current Type
		15~35V dc 24V ac ±20%	15~35V dc 24V ac ±20%	18.5~35VDC (RL=500Ω) 8.5~35VDC (RL=0Ω)
		Protection Level	IP65
Model	LFH102 Duct Type	Output Load	≤500Ω(Current Type)，≥2KΩ(Voltage Type)
		Display	LCD display optional, with unit display and backlight(4~20mA output without backlight)
Model	LFH103 Split Type	Case Material	PC case, PC probe, Polymer filter（stainless probe and stainless filter optional)
		Thermal resistance	Serial number 0,1,2,3,4,5,6 on model selection table

Model Selection Table
Code and description									Remark
LFH101-	Wall-mounted temperature and humidity transmitter								Model
LFH102-	Duct type temperature and humidity transmitter

LFH103-	Split type temperature and humidity transmitter
	2	±2%RH(0.3℃							Accuracy range
	3	±3%RH(0.3℃
		V10	0~10VDC(Three-wired)						Humidity output
		A4	4~20mA(Two-wired)
		RS	RS485/Modbus
			V10	0~10VDC(Three-wired)			2	NTC20K	Temperature output
			A4	4~20mA(Two-wired)			3	Ni 1000
			RS	RS485/Modbus			4	NTC10K-II
			0	PT1000			5	NTC10K-III
			1	PT100			6	NTC10K-A
				0	NO				Temperature range
				1	0~50
				2	minus 20~60
				8	Others (customer specified)
					0	No display			Display mode
					1	LCD display
LFH101-	2	RS	3	1	1				Selection example

Description of Digital Temperature and Humidity Sensor LFH50

A variety of installation methods and output methods are optional
The shell design is light and beautiful, with LCD backlight temperature and humidity dual display
The power supply and output have over-voltage and reverse connection protection , with a high protection grade IP65
Adopt high-precision sensors and main control , with good long-term stability and anti-interference ability

Application of Digital Temperature and Humidity Sensor LFH50

Temperature and Humidity monitoring. Commonly application areas are such as business campus, theaters and museums, stock room, workshop,halls and subway station, Rail transit project，Hospital clean room, Boiler Room

The Temperature Humidity Transmitters are used in PLC, dehumidifier, high standard air conditioner, Supporting infrastructure projects, Metallurgical Automation, Painting equipment

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