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Temperature And Humidity Transmitter LFH10

The probe of temperature and humidity transmitter LFH10 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 temperature and humidity transmitter 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 transmitter 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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Specification of Temperature And Humidity Transmitter LFH10

  • Relative humidity

TransducerDigital
Measurement10%~100%
OutputRS485/Modbus,0~10VDC,4~20mA optional
Accuracy±3%@ 25℃ & 20~80%RH
Response time≤10s(25℃,Slow flow air)


  • Temperature

TransducerDigital or thermal resistance . see selection table
Measurement0~50℃,-20~60℃ etc.
Output4~20mA,0~10VDC,RS485/Modbus ptional
Thermal resistanceSee selection table and thermal  resistance  indexing table
AccuracyDiaital type: ±0.3℃@5~60℃
Thermal resistance : typical±0.2~0.4℃@25℃,see selection table
Power supplyVoltage type/RS485 type  15~35VDC/24VAC±20%Current type:18.5~35VDC (RL=500Ω)
8.5~35VDC (RL=0Ω)
Output load≤500Ω(Current type),≥2KΩ(voltage typel)
DisplayLCD display optional , with unit display and backlight(4~20mAwithout backlight)
Shell materialPC housing , PC probe and polymer filter ( stainless steel probe and stainless steel sintered filter optional )
Working environment-20~60℃,5%-95%RH(Non-condensing)
Protection levelIP65



Model Selection Instructions

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 RS

4~20mA(Two-wired)


V10

RS485/Modbus




V10

0~10VDC(Three-wired)

2

NTC20K±0.4@25

Temperature output




A4  

4~20mA(Two-wired)

3

Ni 1000±0.4@25




RS

RS485/Modbus

4

NTC10K-II, ±0.4@25




0

PT1000±0.2@25 

5

NTC10K-III, ±0.4@25




1

PT100±0.2@25

6

NTC10K-A, ±0.4@25




0

NO  

Temperature range




1

0~50




2

-20~60




8

Others (customer specified)




0

No display  

Display mode




1

LCD display 

LFH101-

2

A4

3

1

1

Selection example

 

Note:

 

1. The current type of LFH 101/102/103 is powered by the humidity loop, so this loop must be used, otherwise the product cannot work normally.

 

2. Only when the temperature output option is V10 or A4, the corresponding temperature range 1-8 can be selected; otherwise, only 0 is available.

 

3.  Example: LFH101-3A4A411 means the wall-mounted type with an accuracy of 3%RH (0.3°C), humidity output 4~20mA, temperature output 4~20mA, temperature range 0~50°C with display.


lfh10_series_dimension.jpg

Description of Temperature And Humidity Transmitter LFH10

  • 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 Temperature Humidity Transmitter

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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