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Lefoo Temperature and Humidity Transmitter with Display LFH50

The probe of Digital Temperature and Humidity Transmitter 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 LFH50 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 LFH50 is not consumed power and can still provide real-time and accurate temperature and humidity monitoring even when the power is off.


* Two outputs Temperature and Humidity

* Anti-interference

* CE and RoHS certificated

Specification of Temperature and Humidity Transmitter with Display LFH50

LEFOO Temperature and Humidity Transmitter with Display LFH50
Note: The relative humidity table and temperature table are separate
Relative Humidity
Sensing ElementDigitalSensing ElementDigital or thermal resistance, see Models Selection Table
Measure Range0%~100%RHMeasure Range0~50℃, -20~60℃
OutputRS485/Modbus,0~10VDC,4~20mAOutput4~20mA, 0~10VDC,   RS485/Modbus
Response Time≤10s(25℃, slow flow air)Work Temperature-20~60℃,5%-95%RH(non-condensing)
Accuracy±2%@ 25℃ & 60%RHAccuracyDigital sensing element:   ±0.5℃@25℃
ModelLFH101 Wall Mounted TypeVoltage TypeRS 485 TypeCurrent Type
LEFOO Temperature and Humidity Transmitter LFH50

15~35V dc

24V ac ±20%

15~35V dc

24V ac ±20%

18.5~35VDC   (RL=500Ω)



Protection Level

ModelLFH102 Duct TypeOutput Load≤500Ω(Current Type),≥2KΩ(Voltage Type)
LEFOO LFH102 Duct TypeDisplayLCD display optional, with   unit display and backlight(4~20mA output without backlight)
ModelLFH103 Split TypeCase MaterialPC case, PC probe, Polymer   filter(stainless probe and   stainless filter optional)
LEFOO LFH103 Split TypeThermal resistanceSerial number 0,1,2,3,4,5,6 on model selection table

Model Selection Table
Code and descriptionRemark
LFH101-Wall-mounted temperature and humidity transmitterModel
LFH102-Duct type temperature and humidity transmitter
LFH103-Split type temperature and humidity transmitter

2±2%RH(0.3℃Accuracy range

V100~10VDC(Three-wired)Humidity output

V100~10VDC(Three-wired)2NTC20KTemperature output
A44~20mA(Two-wired)3Ni 1000

0NOTemperature range
2minus 20~60
8Others (customer specified)

0No displayDisplay mode
1LCD display
LFH101-2RS311Selection example

Features of Temperature and Humidity Transmitter with Display 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

Applications of Temperature and Humidity Transmitter with Display 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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