Indoor Temperature & Humidity Transmitter – Compact & Backlit Display
Compact and reliable temperature and humidity transmitter with LCD display and RS485, current, or voltage output. Perfect for buildings, server rooms, and warehouse environments.
Product Description
This indoor temperature and humidity transmitter is purpose-built for precise environmental monitoring in spaces such as data centers, office buildings, storage facilities, and equipment rooms. Its compact size and standard 86 box-compatible design ensure easy installation and a sleek, unobtrusive appearance.
Equipped with a high-precision imported sensor and robust main control unit, it offers excellent long-term stability and strong resistance to electrical interference, including lightning surges and electrostatic discharge. The backlit LCD screen clearly displays real-time temperature and humidity values for quick, at-a-glance readings.
Offering three output options—current, voltage, and RS485—this transmitter easily integrates into existing control systems or building management networks. Optional passive temperature output makes it even more versatile for a range of applications.
Key Features:
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Compact and stylish housing for indoor environments
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Standard 86 box mount design for easy wall installation
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Dual LCD backlit display for temperature and humidity readings
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High-precision sensing with strong anti-interference protection
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Optional passive temperature output
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RS485 (Modbus), current, and voltage output options
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CE and RoHS certified for quality and safety assurance
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Ideal for server rooms, buildings, warehouses, and commercial facilities
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Specifications
LEFOO Indoor Temperature and Humidity Transmitter LFH20 Relative Humidity Sensor Digital type Range 0%~100%RH Output RS485/Modbus,0~10VDC, 4~20mA optional Accuracy ±3%@ 20℃ & 20~80%RH Response time ≤10s(25℃, slow flow air) Temperature Sensor Digital or RTD, refer to selection table Range 0~50℃, -20~60℃, etc Output Signal 4~20mA,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) Display Optional LCD display with unit display and backlight (4~20mA without backlight) Shell Material PC Working Environment -20~60℃, 5%-95%RH(non-condensing) Protection Class IP30 Selection Guide
Code and Description
Remark
LFH20
Indoor Temperature Humidity Sensor Model
3 ±3%RH(±0.3℃) Accuracy
A4 4~20mA(Two-wired) Humidity output
V10 0~10VDC(Three-wired) RS RS485/Modbus N No output A4
4~20mA(Two-wired) Temperature
output
V10 0~10VDC(Three-wired) RS
RS485/Modbus 0 PT1000，±0.2℃@0℃ 1 PT100，±0.2℃@0℃ 2 NTC20K，±0.4℃@25℃ 3 NTC10K,±0.4℃@25℃ N No output 0 Non Range 1 0~50℃
2 -20~60
8 Customizable
0 Without displa
Display 1 LCD digital display
LFH20
3 A4 A4 1 1 Selection example
Product Manual