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  • New item   Digital duct temperature and humidity sensor with LCD | 0–10 V DC / 4–20 mA

    Digital duct temperature and humidity sensor with LCD | 0–10 V DC / 4–20 mA

    Code: SKU#165278098976225941
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    Price 168.43 € VAT incl.
    ( 139.20 € VAT excl. )
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    Digital duct sensor that measures air temperature and relative humidity in a duct, shows them on an LCD and sends them to a controller as a 0–10 V DC / 4–20 mA signal.

  • Product description

    Digital duct temperature and humidity sensor with LCD | 0–10 V DC / 4–20 mA

    This digital duct sensor measures air temperature and relative humidity in a duct and shows the values on an LCD display. According to the supplier, the outputs are 0–10 V DC / 4–20 mA, suitable for ventilation controllers and PLC. The manufacturer is not confirmed, so please confirm the exact parameters before ordering.

    Key point:
    A duct sensor measures supply or extract air, so the controller reacts to the humidity of the whole zone, not of a single corner. The LCD lets you check readings at the unit without a multimeter.
    Mounting
    Duct
    Display
    LCD
    Output
    0–10 V DC / 4–20 mA
    Measures
    T and RH

    Communication interfaces and integration

    0–10 V DC Voltage signal for ventilation and HVAC controllers.
    4–20 mA Current signal for longer lines and PLC inputs.

    Operating principle

    The sensor is fixed to the duct with a flange and the probe is inserted into the airflow. Power and the output to the controller are connected.

    The sensor measures temperature and relative humidity, shows them on the LCD and converts them into an analogue signal.

    Based on the signal, the controller changes fan speed or switches a humidifier or dehumidifier.

    Why choose a duct sensor with LCD?
    Analogue signal and LCD in one housing: the controller gets a standard signal, and the installer sees immediately what the sensor measures. This speeds up commissioning and troubleshooting.

    Technical specifications

    Product type Duct temperature and humidity sensor with LCD
    Manufacturer / model not confirmed
    Mounting in a duct, probe with flange
    Measured values temperature and relative humidity
    Display LCD
    Outputs 0–10 V DC / 4–20 mA (per supplier data)
    Humidity value stated by supplier 20–80 % RH (likely the accuracy range, not the measuring range)
    Temperature value stated by supplier +5…+60 °C (per supplier data)

    Key functions

    • LCD display – readings visible on site
    • Analogue output – 0–10 V DC / 4–20 mA for standard controllers
    • Two values – temperature and relative humidity in one device
    • Duct probe with flange – quick installation in a duct
    • Simple wiring – fits existing analogue controller inputs

    How does it differ from similar products?

    Sentera DSTHF-3 (22713) Duct transmitter with a confirmed specification – choose it when a documented project is required.
    LEFOO LFH10 (11907) Known manufacturer, IP65, 0–100 % RH, 4–20 mA / 0–10 V or RS485 output by order code.
    Duct RH sensor 0–5 / 0–10 V (3480) Measures humidity, no LCD; this sensor measures temperature and humidity with a display.

    Where is it used?

    • Supply and extract air ducts of ventilation units
    • Heat recovery units
    • Pool and spa ventilation
    • Warehouse and production ventilation
    • Greenhouse air handling
    • Server room air conditioning

    Use by need

    For beginners.
    Before wiring, match the output type to the controller input: 0–10 V or 4–20 mA.
    For experienced installers.
    Insert the probe into the middle of the duct in a straight section, away from humidifiers, heaters and bends.
    For engineers / designers.
    For a BMS with documented parameters or Modbus, choose Sentera DSTHF-3 or LEFOO LFH10.

    Practical application

    Situation: a heat recovery unit controller has a free 0–10 V input, and humidity builds up in the flat in winter. Solution: a duct sensor with LCD is installed in the extract duct. Result: the controller increases airflow based on the humidity signal, and the installer checks readings on the LCD during commissioning.

    Pros / advantages

    • LCD display – readings on site
    • Analogue output 0–10 V DC / 4–20 mA
    • Temperature and humidity in one device
    • Duct mounting with flange
    • Simple connection to existing controllers

    Cons / limitations

    • Manufacturer and full specification not confirmed
    • No Modbus – for digital integration choose Sentera DCTHM-2 (22712)
    • Meaning of the 20–80 % RH value in the name is unclear

    Safety and installation notes

    • ⚡ Make connections with the power switched off.
    • ⚡ Check supply voltage and terminal marking against the device label before wiring.
    • Route signal cables separately from power cables; use shielded cable for long lines.
    • Do not install the probe directly after a humidifier – droplets and mist will distort readings.

    Quick selection guide

    Duct
    LCD
    0–10 V / 4–20 mA
    T + RH
    Suitable when you need:
    • an analogue T and RH signal for a controller
    • readings on an LCD
    • duct mounting
    • simple wiring without Modbus
    Check before choosing:
    • supply voltage on the device label
    • whether the controller accepts 0–10 V or 4–20 mA
    • what the supplier's 20–80 % RH and +5…+60 °C values mean
    • probe length versus duct diameter
    Important reminder: This is a measuring sensor, not a controller: it has no relay output and does not control a humidifier or fan by itself. For a project with a confirmed specification, choose a documented Sentera or LEFOO model.
    ☝ Elsprendimai.eu recommends:

    FAQ

    What does 20–80 % RH in the name mean?
    The supplier does not state its purpose. Usually such a value marks the range where the stated accuracy applies, not the measuring limits.
    Which output to choose – 0–10 V or 4–20 mA?
    0–10 V is simpler for short lines to the controller. 4–20 mA is more resistant to interference and suits longer lines and PLC.
    Can the sensor switch a humidifier by itself?
    No. It sends an analogue signal and the controller makes the decision. Direct control requires a hygrostat with a relay.
    Where should the probe go in the duct?
    In a straight duct section, with the probe tip in the middle of the airflow, away from humidifiers, heaters and bends.
    What is the LCD for?
    During commissioning and service you see what the sensor measures and can compare it with the controller without a multimeter.
    Is there a Modbus version?
    Modbus is not stated for this sensor. For digital integration choose Sentera DCTHM-2 with Modbus RTU.

    Sources: supplier product name and photo; manufacturer datasheet not found. Checked 2026-10-19.

    Duct T/RH sensor with LCD, 0–10 V / 4–20 mA

    Digital duct temperature and humidity sensor with LCD display and 0–10 V DC / 4–20 mA output for ventilation controllers. Suitable for ducts, heat recovery units and air handling units.

    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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