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Indoor Temperature & Humidity Transmitter – Compact & Backlit Display

Indoor Temperature & Humidity Transmitter – Compact & Backlit Display

SKU: LFH20
$189.00Price

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:

    • Compact and stylish housing for indoor environments

    • Standard 86 box mount design for easy wall installation

    • Dual LCD backlit display for temperature and humidity readings

    • High-precision sensing with strong anti-interference protection

    • Optional passive temperature output

    • RS485 (Modbus), current, and voltage output options

    • CE and RoHS certified for quality and safety assurance

    • Ideal for server rooms, buildings, warehouses, and commercial facilities

  • 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

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