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Indoor Temperature Humidity Sensor LFH20

LEFOO LFH20 temperature and humidity transmitter is a transmitter specially designed for indoor temperature and humidity detection, with small size, simple installation and easy operation. It has special design for lightning surge, electrostatic discharge, group pulse, withstand voltage, etc., and has strong anti-interference ability. There are three output modes of current, voltage and RS485 to choose from. It can be widely used in computer rooms, buildings, warehouses and other places that need to measure temperature and humidity.


Features

Comply with the standard 86 box installation method

The shell design is light and beautiful, with LCD backlight temperature and humidity dual display, easy to use

Adopt imported high-precision sensors and main control, with good long-term stability and anti-interference ability

Optional passive temperature output

CE, RoSH certification


Specification of Indoor Temperature and Humidity Sensor LFH20

Technical parameter

LEFOO Indoor Temperature and Humidity Sensor LFH20
Relative Humidity
SensorDigital type
Range0%~100%RH
OutputRS485/Modbus,0~10VDC, 4~20mA optional
Accuracy±3%@ 20℃ & 20~80%RH
Response time≤10s(25℃, slow flow air)
Temperature
SensorDigital or RTD, refer to selection table
Range0~50℃, -20~60℃, etc
Output Signal4~20mA,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)
DisplayOptional LCD display with unit display and backlight (4~20mA without backlight)
Shell MaterialPC
Working Environment-20~60℃, 5%-95%RH(non-condensing)
Protection ClassIP30



Dimension

20size2.jpg

Selection Guide

Code and Description

Remark

LFH20

Indoor Temperature Humidity Sensor

Model


3±3%RH(±0.3℃)

Accuracy


A44~20mA(Two-wired)

Humidity output

V100~10VDC(Three-wired)
RSRS485/Modbus
N
No output

A4

4~20mA(Two-wired)

Temperature

output

V100~10VDC(Three-wired)

RS

RS485/Modbus
0PT1000,±0.2℃@0℃
1PT100,±0.2℃@0℃
2NTC20K,±0.4℃@25℃
3NTC10K,±0.4℃@25℃
NNo output

0NonRange
1

0~50℃

2

-20~60

8

Customizable


0

Without displa

Display
1

LCD digital display



LFH20

3A4A411

Selection example


Features of Indoor Temperature and Humidity Sensor LFH20

  • Comply with the standard 86 box installation method

  • The shell design is light and beautiful, with LCD backlight temperature and humidity dual display, easy to use

  • Adopt imported high-precision sensors and main control, with good long-term stability and anti-interference ability

  • Optional passive temperature output

  • CE, RoSH certification

Applications of Indoor Temperature and Humidity Sensor LFH20

LFH20 can be widely used in computer rooms, HVAC, buildings, warehouses and other places where temperature and humidity measurement and control are required.

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