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  • New item   Temperature and humidity transmitter with LCD | 0–100 % RH | 4–20 mA / 0–10 V / RS485 Modbus | 15–35 V DC / 24 V AC | IP65 | LEFOO LFH10

    Temperature and humidity transmitter with LCD | 0–100 % RH | 4–20 mA / 0–10 V / RS485 Modbus | 15–35 V DC / 24 V AC | IP65 | LEFOO LFH10

    Code: LFH10
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    Price 62.92 € VAT incl.
    ( 52.00 € VAT excl. )
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    Industrial temperature and relative humidity transmitter for controllers, PLC and BMS. Measures 0–100 % RH, sends a 4–20 mA, 0–10 V or RS485 Modbus signal, IP65 housing with LCD display.

  • Product description

    Temperature and humidity transmitter LEFOO LFH10

    LEFOO LFH10 is a transmitter that converts temperature and relative humidity into a standard automation signal. Measuring range: 0–100 % RH, output: 4–20 mA, 0–10 V DC or RS485 Modbus, housing: IP65. Readings are shown on the LCD display.

    Key point:
    LFH10 connects directly to a PLC, ventilation controller or BMS without extra modules. One housing with different mounting versions fits a wall, a duct or a remote probe. The LCD lets you check readings on site without a multimeter.
    Humidity range
    0–100 % RH
    Output
    4–20 mA / 0–10 V / RS485
    Protection rating
    IP65
    Power supply
    15–35 V DC / 24 V AC

    Communication interfaces and integration

    4–20 mA Interference-resistant signal for long lines to a PLC or controller; load ≤500 Ω.
    0–10 V DC Direct input for ventilation and HVAC controllers; load ≥2 kΩ.
    RS485 Modbus Digital data transfer to a BMS or PLC network; confirm the parameters in the manual of the specific unit.

    Operating principle

    The transmitter is fixed to a wall, into a duct or with a remote probe, depending on the ordered version. Low-voltage supply and the selected output are connected to the controller.

    A digital element measures relative humidity, a temperature element measures temperature. Each value is sent over a separate channel of the selected type: 0–10 V, 4–20 mA or RS485.

    The controller receives a continuous signal and uses it to control fans, humidifiers or dehumidifiers. The same values are visible on the LCD on site.

    Why choose the LEFOO LFH10?
    LFH10 combines measurement, display and a standard output in one IP65 housing. This is practical in plant rooms, warehouses and ventilation systems where you need both a signal for automation and a quick visual check.

    Technical specifications

    Product type Temperature and relative humidity transmitter with LCD
    Manufacturer / model LEFOO LFH10 (LFH101 / LFH102 / LFH103)
    Mounting versions LFH101 – wall, LFH102 – duct, LFH103 – remote probe
    Humidity measuring range 0–100 % RH
    Humidity accuracy ±3 % RH (20 °C, 20–80 % RH)
    Humidity response time ≤10 s (20 °C, slow airflow)
    Temperature range 0…+50 °C or −20…+60 °C (by order code)
    Temperature element and accuracy digital ±0.3 °C; PT100 / PT1000 ±0.2 °C (0 °C); NTC10K / NTC20K ±0.4 °C (25 °C)
    Outputs 0–10 V DC, 4–20 mA or RS485 Modbus – type selected by order code, separately for RH and T
    Power supply (0–10 V, RS485) 15–35 V DC or 24 V AC ±20 %
    Power supply (4–20 mA) 19–35 V DC (RL = 500 Ω) / 9.5–35 V DC (RL = 0 Ω)
    Load ≤500 Ω (current output), ≥2 kΩ (voltage output)
    Display LCD with backlight (no backlight in the 4–20 mA version)
    Operating conditions −20…+60 °C, 5–95 % RH, non-condensing
    Protection rating IP65
    Materials ABS housing and probe, polymer filter

    Key functions

    • Standard outputs – 4–20 mA, 0–10 V or RS485 Modbus without extra modules
    • Two channels – humidity and temperature are sent separately
    • LCD display – readings checked on site
    • IP65 housing – suitable for plant rooms and dusty areas
    • Three mounting versions – wall, duct or remote probe
    • Choice of temperature element – digital, PT100, PT1000 or NTC

    How does it differ from similar products?

    Sentera DSTHF-3 (22713) Sentera duct transmitter with analogue outputs and Modbus RTU – convenient when all ventilation automation is Sentera.
    Sentera RSTHF-3 (22723) Sentera room transmitter for residential and office spaces. LFH10 offers an IP65 housing and a choice of mounting.
    Duct T/RH sensor with LCD (5273) Also has LCD and 0–10 V / 4–20 mA, but the manufacturer and detailed parameters are not confirmed.

    Where is it used?

    • Ventilation and air handling units
    • Warehouses and logistics centres
    • Greenhouses and grow rooms
    • Server rooms and electrical switch rooms
    • Production halls and workshops
    • Archives, museums, libraries
    • BMS building management systems

    Use by need

    For beginners.
    When ordering, specify the mounting version and the output type your controller accepts.
    For experienced installers.
    For a 4–20 mA loop, check the supply voltage against the load: a 500 Ω loop needs at least 19 V DC.
    For engineers / designers.
    For the RS485 version, confirm Modbus baud rate, address and register map in the manual of the specific unit before designing the BMS.

    Practical application

    Situation: a warehouse ventilation controller only has 0–10 V inputs, and humidity exceeds 70 % RH in summer. Solution: an LFH101 with 0–10 V outputs is installed and powered with 24 V AC from the controller. Result: the controller increases extraction based on the humidity signal, and the LCD lets the operator see readings immediately.

    Pros / advantages

    • Three output types – matches any controller
    • IP65 housing
    • 0–100 % RH range
    • LCD display for on-site readings
    • Wide supply range: 15–35 V DC or 24 V AC
    • Operating temperature −20…+60 °C

    Cons / limitations

    • Output type is fixed by the order code – it cannot be changed later
    • Humidity accuracy ±3 % RH – not enough for laboratory measurements
    • Modbus parameters and dimensions are not given in the datasheet
    • For a Sentera system with Modbus RTU, Sentera DSTHF-3 (22713) is more convenient

    Safety and installation notes

    • ⚡ Connect only to a low-voltage supply (15–35 V DC or 24 V AC) – 230 V AC will damage the transmitter.
    • ⚡ Make connections with the supply switched off; route signal cables separately from power cables.
    • Do not install where condensation occurs – 5–95 % RH non-condensing is allowed.
    • In the duct version, insert the probe into the middle of the duct, away from humidifiers and heaters.
    • Mount the wall version away from doors, windows and heat sources.

    Quick selection guide

    0–100 % RH
    4–20 mA / 0–10 V / RS485
    IP65
    −20…+60 °C
    Suitable when you need:
    • a humidity signal for a PLC or controller
    • an IP65 housing in a plant room
    • readings on an LCD
    • a wall, duct or remote probe version
    Check before choosing:
    • which output your controller accepts
    • which mounting version you need
    • which temperature range you need: 0…+50 or −20…+60 °C
    • whether ±3 % RH accuracy is sufficient
    Important reminder: LFH10 is a measuring transmitter, not a controller. It has no relay output and does not control a humidifier or fan by itself – the decision is made by the controller, PLC or BMS.
    ☝ Elsprendimai.eu recommends:

    FAQ

    Do all three outputs work at the same time?
    No. The signal type – 0–10 V, 4–20 mA or RS485 – is selected by the order code. Humidity and temperature are sent over separate channels of that type.
    What is the humidity accuracy?
    According to the manufacturer's datasheet, ±3 % RH at 20 °C and 20–80 % RH.
    What supply voltage is needed?
    For 0–10 V and RS485 versions – 15–35 V DC or 24 V AC ±20 %. For the 4–20 mA version – 19–35 V DC at 500 Ω load.
    Can it be mounted in a duct?
    Yes, the duct version is LFH102. LFH101 is for wall mounting, LFH103 for a remote probe.
    Does the LCD have a backlight?
    Yes, except for the 4–20 mA version, where the LCD has no backlight.
    Is it suitable outdoors?
    The housing is IP65 and the operating temperature is −20…+60 °C, but condensation is not allowed. Outdoors, protection from rain and direct sun is required.

    Sources: LEFOO LFH10 datasheet (LEFOO Brasil). Checked 2026-10-19.

    LEFOO LFH10 temperature and humidity transmitter

    LEFOO LFH10 is a temperature and humidity transmitter with 4–20 mA, 0–10 V or RS485 Modbus output, IP65 housing and LCD display. It suits ventilation, warehouses, greenhouses and BMS systems.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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