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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