LFH21 Temperature and Humidity Controller

PRODUCT FEATURES

Standard switch box installation method for easy use.
Light and beautiful shell design,with LCD backlight to display dual temperature and humidity.
Using imported high-precision sensors with good long-term staility and anti-interference ability.
Optional passive temperature output.
Temperature and humidity offset can be set to facilitate customer on-site operation.
CE certification,ROSH
Wth relay and alarm function

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Description

Specification

Product Selection

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Description

LFH21 Temperature and Humidity Controller is a product specially designed for indoor temperature and humidity detection andcontrol.It has the advantages of compact size,simple installation and convenient operation.It has special design for lightningsurge,electrostatic discharge,group pulse,voltage resistance,etc.,strong ant-interference ability,and has an alarm function.Itis widely used in computer rooms,buildings,warehousing and other places where temperature and humidity measurement andcontrol are required.

Specification

1.RELATIVE HUMIDITY
Sensor	Digital
Range	0%~100%RH
Output	RS485/Modbus,0~10VDC
Accuracy	±3%@20℃&20~80%RH
Response time	≤10s(20℃,slow flow air)
2.TEMPERATURE
Sensor	Digital or passive thermal resistor,details in below selection table
Range	0~50℃,-20~60℃ ETC
Output	RS485/Modbus,0~10VDC,
Thermal resistance	Details in selection table and thermal resistance graduation table
Accuracy	Digital type:±0.3℃@20℃;See table below Passive thermal resistance:typical±0.2~0.4℃@25℃
Power supply	RS485:15~35VDC/24VAC±20%	Voltage:15~35VDC/24VAC±20%
	Note:when RS485 and voltage type uses AC power supply,an isolation transformer is required
Output load	≥10 KΩ(voltage output)
Display accuracy	0.1℃,0.1%RH
Display and buttons	LCD display and keys with unit display and backlight
Alarm function	1×BUZZER,1×LED
Relay	2×SPST,3A/30VDC,3A/250VAC
Shellmaterial	PC shell
Operating environment	-20~60℃,5%-95%RH(Non-condensing)
Protection Grade	IP30

Product Selection

Code and description

Remark

LFH21

Indoor type temperature and humidity controller

Model

±3%RH(±0.3℃)

Accuracy

V10

0~10VDC(3-wire)

Humidity
output

RS485/Modbus

V10

0~10VDC(3-wire)

NTC20K,±0.4℃@25℃

Temperature
output

RS485/Modbus

NTC10K,±0.4℃@25℃

PT1000,±0.2℃@0℃

PT100,±0.2℃@0℃

Temperature
range

0~50℃

-20~60℃

Customized range

Setting button,backlight LCD display with unit

Display and
setting button

Alarm only

Alarm ans
relay

Relay only

Alarm ans relay

LFH21 3 V10 V10 2 1 3

Model Example

FAQs

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What services are included in the after-sales service

Please carefully inspect the following products ordered from LEFOO when you receive them.If you do not meet your reservation requirements or find that the products have surface quality problems,please take photos and contact the sales engineer who served you.Once this kind of product is signed,within 7 days,the LEFOO product will maintain the original quality and function when it was sold,and the product itself,accessories,and trademark logos are complete,and you can return the product without reason.Within 30 days,accept the return application due to quality reasons.

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