Products catalog

Home/Product Catalog/HVAC control solutions for heating and ventilation/HVAC automation/Sensors and detectors/Temperature and humidity sensors | environmental parameter measurement solutions
  • New item   -57.42€Smart duct temperature and humidity sensor-controller | -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 18-34VDC | IP54 | Sentera Controls | DCTHF-2
    New item   -57.42€Smart duct temperature and humidity sensor-controller | -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 18-34VDC | IP54 | Sentera Controls | DCTHF-2 1
    New item   -57.42€Smart duct temperature and humidity sensor-controller | -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 18-34VDC | IP54 | Sentera Controls | DCTHF-2 2
    New item   -57.42€Smart duct temperature and humidity sensor-controller | -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 18-34VDC | IP54 | Sentera Controls | DCTHF-2 3
    New item   -57.42€Smart duct temperature and humidity sensor-controller | -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 18-34VDC | IP54 | Sentera Controls | DCTHF-2 4

    Smart duct temperature and humidity sensor-controller | -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 18-34VDC | IP54 | Sentera Controls | DCTHF-2

    Code: DCTHF-2
    Inquire about this item
    Price 102.55 € VAT incl.
    ( 84.75 € VAT excl. )
    159.97 € You save 57.42 €
    Offer is valid until 2026-12-31
    Want another price? Suggest yours!
  • Product description

    Smart duct temperature and humidity sensor-controller | -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 18-34VDC | IP54 | Sentera Controls | DCTHF-2

    DCTHF-2 – a Sentera Controls smart duct temperature and humidity sensor-controller: it measures temperature (-30…+70 °C) and relative humidity (0–100 % rH) in the duct and, using the integrated algorithm, generates one analog / modulating output (0-10 VDC, 0-20 mA or PWM) that can directly control an EC fan, an AC fan speed controller or a damper actuator. Supply – 18–34 VDC; all parameters are accessible via Modbus RTU.

    Key idea:
    This is a transmitter and a controller in one: it needs no separate controller, because the output is calculated in the sensor itself according to the set temperature and humidity ranges. The output is determined by the higher of the two values, and either parameter can be disabled – e.g. to control by temperature only or by humidity only.
    Measurement
    -30…+70 °C / 0–100 % rH
    Control output
    0-10 VDC / 0-20 mA / PWM
    Power supply
    18–34 VDC
    Protection
    housing IP54, probe IP20

    Operating principle

    The transmitter is mounted on the duct, the probe is inserted into the airflow (min. 1 m/s), and it is wired with 4 wires with separate grounds: supply 18–34 VDC (VIN, GND), control output AO1 with its own GND and Modbus RTU (A, /B).

    Integrated sensors measure temperature and relative humidity; a range is set for each quantity within which the output varies 0–100 %, the output is determined by the higher of the two calculated values, and either quantity can be disabled. The output type is selectable – 0-10 VDC (≥ 50 kΩ), 0-20 mA (≤ 500 Ω) or 1 kHz PWM (open collector, 3.3 or 12 VDC) – and it directly controls an EC fan, an AC fan speed controller or a damper actuator; all parameters are changed over Modbus RTU, and the firmware is updated over the network.

    Result – demand-controlled ventilation without a separate controller: as the humidity or temperature of the extract air rises the fan speeds up, and when it falls it slows down to the minimum.

    Benefits DCTHF-2?
    Sensor and control algorithm in one – less equipment in the control panel, a simpler design and faster commissioning, while Modbus RTU allows later integration into a BMS.

    Technical specifications

    Product type Smart duct temperature and humidity sensor-controller
    Manufacturer / code Sentera Controls / DCTHF-2
    Series DCTH-2 (DCTHF-2 / DCTHG-2 / DCTHM-2)
    Measured quantities Temperature, relative humidity
    Temperature range -30…+70 °C
    Humidity range 0–100 % rH, non-condensing
    Accuracy ±0.4 °C (-30…+70 °C); ±3 % rH
    Control logic Output based on the higher of the T and rH values; each parameter can be disabled
    Analog output 1 × 0-10 VDC (RL ≥ 50 kΩ) / 0-20 mA (RL ≤ 500 Ω) / PWM 1 kHz, open collector, 3.3 or 12 VDC
    Communication Modbus RTU (RS485), A, /B; firmware update via Modbus RTU
    Supply voltage 18–34 VDC
    Max. current (Imax) 40 mA
    Connection 4-wire, separate grounds (-F)
    Min. air velocity 1 m/s
    Protection class IP54 housing, IP20 probe
    Weight 0.16 kg (net)
    Compliance LVD 2014/35/EU, EMC 2014/30/EU, WEEE 2012/19/EU, RoHS 2011/65/EU

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

    Original manufacturer documentation – technical data, wiring diagrams and installation instructions.

    Main functions

    • Integrated control algorithm – the output is generated according to the set T and rH ranges, without a separate controller.
    • Parameters that can be disabled – can be controlled by temperature only or humidity only.
    • Direct control – An EC fan, AC speed controller or damper actuator is connected directly to the output.
    • Modbus RTU – all parameters and measurements are accessible remotely; Modbus timeout (HR8) monitoring.
    • Firmware update – over the Modbus RTU network.
    • Configuration – Configuration and monitoring – the free Sentera 3SModbus software (via the CNVT-USB-RS485 converter) or the Sensistant Modbus configurator.

    Where is it used?

    • Extraction ducts from bathrooms, showers and swimming pools
    • Humidity- and temperature-based ventilation in residential and commercial buildings
    • Warehouses, workshops
    • Systems with EC fans
    • BMS with Modbus RTU
    • Swimming pool extract air ducts
    • Heat recovery unit extract air ducts in apartment buildings

    On-demand operation

    For the swimming pool ventilation designer.
    The duct sensor-controller directly controls the EC fan based on extract air humidity, with no separate controller.
    For the 24 VDC automation installer.
    The -F version is wired with 4 wires with separate grounds, so the control signal stays stable on a long line to the fan.
    For HVAC commissioning engineers.
    The T and rH ranges and the output type are set via Modbus RTU, and an unneeded quantity can be switched off.

    Practical application

    If in a swimming pool extract air duct (≥ 1 m/s) the EC fan speed has to be increased as humidity rises, then the DCTHF-2 is wired with 4 wires to 24 VDC and its AO1 0-10 VDC signal directly controls the fan, and the temperature parameter can be disabled.

    Application guide: how it is used in practice

    The same DCTHF-2 adapts to different sites – only what is connected to its output changes:

    Site What is connected Result Installer's note
    Bathroom, shower, laundry AO1 0-10 VDC → EC fan control input As humidity rises, extraction automatically increases; when it falls, it returns to the minimum Temperature can be disabled – control by rH only
    Warehouse, workshops AO1 → AC fan speed controller analog input On a hot day extraction increases with temperature Select the signal type according to the regulator input
    System with an air damper AO1 → damper actuator 0-10 VDC input The damper opens in proportion to humidity or temperature Check the actuator input resistance (≥ 50 kΩ for voltage mode)
    Building with BMS Modbus RTU → A, /B Settings and status are accessible centrally A separate address for each sensor

    How to choose a duct temperature and humidity transmitter

    Installation / output / power supply Recommended model
    Duct, 3 analog outputs (T / rH / T or rH), 18–34 VDC, 4 wires DSTHF-3 (duct transmitter, -F)
    Duct, 3 analog outputs, 18–34 VDC or 15–24 VAC, 3 wires DSTHG-3 (duct transmitter, -G)
    Duct, Modbus RTU only, Power over Modbus (PoM), RJ45 DSTHM-2 (duct Modbus transmitter)
    Duct, direct fan / damper control with 1 output, 18–34 VDC DCTHF-2 (smart duct sensor, -F) ← this model
    Duct, direct control with 1 output, 18–34 VDC or 15–24 VAC DCTHG-2 (smart duct sensor, -G)
    Duct, control signal via Modbus RTU, PoM, RJ45 DCTHM-2 (smart duct sensor, PoM)
    Rule: first decide where the measurement is made (duct, room, outdoors), then what you need from the transmitter: separate analog signals for a controller (transmitter, 3 outputs), data only to a BMS (Modbus / PoM version), or direct fan control with a single output (smart sensor). Finally – the supply and number of wires: -F – 24 VDC, 4-wire, separate grounds; -G – AC or DC, 3-wire, common ground; -M / -H – power over the Modbus cable (RJ45).
    When to choose another solution: for measurement only with 3 analog outputs – DSTHF-3 / DSTHG-3; for Modbus-only measurement – DSTHM-2; when control by CO2 is also needed – DCMFG-2R.

    Pros

    • Transmitter and controller in one
    • Control by T, rH or both
    • Accuracy ±0.4 °C, ±3 % rH
    • Modbus RTU, firmware updated over the network
    • 0-10 VDC / 0-20 mA / PWM output
    • IP54 housing, -30…+70 °C

    Cons / limitations

    • One control output – for separate T and rH signals choose a transmitter (RSTH-3 / DSTH-3)
    • IP20 probe, an airflow of ≥ 1 m/s is required
    • The -F version is not suitable for 3-wire systems or AC supply

    Safety and installation notes

    • Installation and connection are to be carried out by a qualified electrician / automation specialist with the power disconnected.
    • Supply voltage – 18–34 VDC.
    • The -F version: 4-wire connection, separate supply and analog output grounds – not suitable for 3-wire systems and must never be connected to an alternating current (AC) supply.
    • Do not mix -F and -G type products on the same network.
    • Resetting the Modbus communication parameters – with a jumper on PROG pins 1 and 2 for at least 5 s.
    • Install the probe in the airflow, away from humidifiers and condensate.

    Quick selection guide

    -30…+70 °C
    0–100 % rH
    0-10 VDC / 0-20 mA / PWM
    Modbus RTU
    18–34 VDC
    IP54
    Suitable when you need:
    • to control a fan or damper according to temperature and humidity in a duct without a separate controller;
    • to implement demand-controlled ventilation in damp rooms;
    • to integrate the control into a BMS later via Modbus RTU.
    Check before use:
    • the input type of the controlled device (0-10 VDC, 0-20 mA or PWM);
    • the supply: 18–34 VDC;
    • whether separate T and rH signals are needed – then choose a transmitter.
    Important reminder: The DCTHF-2 generates one control signal from T and rH; it does not replace the power section of a fan speed controller.

    FAQ

    Is a separate controller required?
    No, the algorithm is built in, and the output connects directly to an EC fan, AC speed controller or damper.
    Can it be controlled by humidity only?
    Yes, the temperature (or humidity) parameter can be switched off via Modbus RTU.
    How are the settings changed?
    Via Modbus RTU – the 3SModbus software with a CNVT-USB-RS485 converter, or via BMS.
    How do I reset the Modbus settings?
    With a jumper on PROG contacts 1 and 2 for at least 5 seconds.
    What is the difference between the -F and -G versions?
    -F is powered at 18–34 VDC and wired with 4 wires with separate grounds, while -G is powered at 18–34 VDC or 15–24 VAC and wired with 3 wires with a common ground.
    What airflow is needed?
    At least 1 m/s.

    Smart duct temperature and humidity sensor-controller | -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 18-34VDC | IP54 | Sentera Controls | DCTHF-2

    Sentera DCTHF-2 – a smart duct temperature and humidity sensor-controller: -30…+70 °C, 0–100 % rH, control output 0-10 VDC / 0-20 mA / PWM, power supply 18–34 VDC, IP54. Ventilation based on humidity and temperature without a separate controller.

    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.

  • Subscribtion to new arrivals

    privacy policy

    Information