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  • New item   -163.81€Smart duct CO2 sensor-controller | CO2 0-2000ppm | T -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DCMFG-2R
    New item   -163.81€Smart duct CO2 sensor-controller | CO2 0-2000ppm | T -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DCMFG-2R 1
    New item   -163.81€Smart duct CO2 sensor-controller | CO2 0-2000ppm | T -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DCMFG-2R 2
    New item   -163.81€Smart duct CO2 sensor-controller | CO2 0-2000ppm | T -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DCMFG-2R 3
    New item   -163.81€Smart duct CO2 sensor-controller | CO2 0-2000ppm | T -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DCMFG-2R 4

    Smart duct CO2 sensor-controller | CO2 0-2000ppm | T -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DCMFG-2R

    Code: DCMFG-2R
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  • Product description

    Smart duct CO2 sensor-controller | CO2 0-2000ppm | T -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DCMFG-2R

    DCMFG-2R – a Sentera Controls smart duct CO2 sensor-controller that measures CO2 concentration (0–2000 ppm), temperature (-30…+70 °C) and relative humidity (0–100 % rH) in the duct and has one control output (0-10 VDC, 0-20 mA or PWM), which the integrated algorithm calculates from the highest of the T, rH and CO2 values. Supply – 24 VDC or 24 VAC ±10 %.

    Key idea:
    This is demand-controlled ventilation “out of the box”: the sensor itself decides how much ventilation is needed and directly controls an EC fan, an AC speed controller or a damper actuator. Any of the three measured quantities can be disabled – e.g. to control by CO2 only.
    CO2 range
    0–2000 ppm
    Output
    1 × 0-10 VDC / 0-20 mA / PWM
    Power supply
    24 VDC or 24 VAC ±10 %
    Protection
    housing IP54, probe IP20

    Operating principle

    The device is mounted on the duct and the probe is inserted into the airflow (at least 1 m/s recommended). Connect the 24 VDC or 24 VAC power supply (VIN, GND), the control output AO1 with its own GND, and Modbus RTU (A, /B); the terminals are push-in, for wires up to 1.5 mm².

    A replaceable and calibratable CO2 element, together with a temperature and humidity sensor, measures duct air quality; a range is set for each quantity, and the output (0–100 %) follows the highest of the three calculated values. The output type is 0-10 VDC (≥ 50 kΩ), 0-20 mA (≤ 500 Ω) or 1 kHz PWM (3.3 or 12 VDC), so it directly controls an EC fan, an AC fan speed controller or a damper actuator; all parameters are available over Modbus RTU.

    Result – ventilation according to extract air quality without a separate controller: in empty rooms ventilation runs at a minimum, and as people gather it increases, which reduces heating / cooling losses and fan energy consumption.

    Benefits DCMFG-2R?
    CO2, temperature, humidity and a control algorithm in one device – demand-controlled ventilation without a separate controller or programming.

    Technical specifications

    Product type Smart duct CO2 sensor-controller
    Manufacturer / code Sentera Controls / DCMFG-2R
    Measured quantities CO2, temperature, relative humidity
    CO2 range 0–2000 ppm
    Temperature range -30…+70 °C
    Humidity range 0–100 % rH, non-condensing
    Accuracy CO2 ±(45 ppm + 3 %); ±0.4 °C (5…50 °C), ±0.8 °C (-20…50 °C); ±3 % rH (20–80 %), ±5 % rH (5–95 %)
    Outputs AO1 according to the highest of T / rH / CO2: 0-10 VDC (RL ≥ 50 kΩ) / 0-20 mA (RL ≤ 500 Ω) / PWM 1 kHz, 3.3 or 12 VDC
    Communication Modbus RTU (RS485); firmware update via Modbus RTU
    Supply voltage 24 VDC or 24 VAC ±10 %
    Min. air velocity 1 m/s
    Housing ABS plastic, grey (RAL 7035)
    Protection class IP54 housing, IP20 probe
    Operating / storage conditions -10…+60 °C, 0–95 % rH non-condensing / -30…+70 °C
    Weight 0.18 kg (net)
    Compliance LVD 2014/35/EU, EMC 2014/30/EU, WEEE 2012/19/EU, RoHS (EU) 2015/863

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

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

    Main functions

    • Integrated algorithm – the output follows the highest of T, rH and CO2 – direct control of an EC fan, an AC controller or a damper.
    • Parameters that can be disabled – can be controlled by CO2 only or any combination.
    • Modbus RTU – all measurements and settings are accessible remotely.
    • Firmware update – over the Modbus RTU network.
    • Replaceable CO2 element – the element can be replaced or calibrated without replacing the whole device.
    • Configuration – Configuration and monitoring – the free Sentera 3SModbus software (via the CNVT-USB-RS485 converter) or the Sensistant Modbus configurator.

    Where is it used?

    • Extract air ducts in ventilation units
    • Centralised ventilation of schools, offices and halls
    • Demand-controlled ventilation (DCV) with VAV dampers
    • Heat recovery unit automation
    • BMS systems with Modbus RTU
    • Exhaust ducts of meeting rooms and sports halls
    • Restaurant hall ventilation units

    On-demand operation

    For heat recovery unit manufacturers.
    The duct CO2 sensor-controller directly controls the unit's EC fan with a single signal based on extract air quality.
    For the designer of DCV systems with VAV dampers.
    The output, based on the highest of CO2, T and rH, directly controls the zone damper actuator.
    For school centralized ventilation installers.
    A single duct device replaces the room sensors in each classroom when a common zone is ventilated.

    Practical application

    If in the extract duct of a school hall (≥ 1 m/s) the EC fan speed has to be increased as CO2 rises, then the DCMFG-2R is powered at 24 VAC or 24 VDC and its AO1 0-10 VDC signal proportionally increases the speed as CO2 approaches the set limit within the 0–2000 ppm range.

    Application guide: how it is used in practice

    The same DCMFG-2R adapts to different sites – only what is connected to its outputs changes:

    Site What is connected Result Installer's note
    Classroom, conference room AO1 0-10 VDC → EC fan control input The fan speeds up as CO2 rises; in an empty room – minimum T and rH can be disabled – control by CO2 only
    Room with a VAV / air damper AO1 → damper actuator 0-10 VDC input The damper opens in proportion to air quality Actuator input resistance ≥ 50 kΩ
    AC fan AO1 → analog input of an electronic or transformer controller AC fan speed according to CO2 Check the speed controller's input signal type
    Building with BMS Modbus RTU → A, /B Measurements and settings centralised A separate address for each device

    How to choose a CO2 transmitter

    Installation / output / power supply Recommended model
    Room, 3 separate outputs T / rH / CO2, 24 VDC, 4 wires RSMFF-3 (multifunction transmitter, -F)
    Room, 3 separate outputs T / rH / CO2, 24 VDC or 24 VAC, 3 wires RSMFG-3 (multifunction transmitter, -G)
    Room, 1 control output based on T / rH / CO2, 24 VDC RCMFF-3 (smart sensor, -F)
    Room, 1 control output, 24 VDC or 24 VAC RCMFG-3 (smart sensor, -G)
    Flush-mounted / surface-mounted, 1 output, powered from the 230 V mains FCMF8-R (85–264 VAC)
    Flush-mounted / surface-mounted, 1 output, 24 VDC or 24 VAC FCMFG-R (24 VAC/VDC)
    Duct, 1 control output based on T / rH / CO2, 24 VAC/VDC DCMFG-2R (smart duct sensor) ← this model
    Duct, NDIR CO2 + T + rH, Modbus RTU only DSCDG0-4 (no analog outputs)
    Duct, NDIR CO2 + T + rH, 3 analog outputs + Modbus RTU DSCDG3-4 (3 outputs)
    Rule: by installation location (wall, flush-mounting box, duct) and by what is needed: separate T / rH / CO2 signals for a controller or BMS (transmitter, 3 outputs), a single control signal directly to an EC fan or damper (smart sensor), or Modbus data only. Choose the supply according to the site's control circuit: -F – 24 VDC, 4-wire; -G – 24 VAC or 24 VDC, 3-wire; 8 – directly from the 230 V mains.
    When to choose another solution: for separate signals or Modbus only – DSCDG3-4 / DSCDG0-4; in a room – RCMF-3 series; without CO2 – DCTH-2 series.

    Pros

    • CO2, temperature and humidity in one device
    • Modbus RTU, firmware updated over the network
    • Integrated control algorithm – no separate controller needed
    • Replaceable, calibrated CO2 element
    • IP54 housing

    Cons / limitations

    • One control output – for separate signals choose a transmitter
    • IP20 probe, an airflow of ≥ 1 m/s is required
    • It measures the duct air, not the air of a specific room – for an individual room choose the RCMF-3 series

    Safety and installation notes

    • Installation and connection are to be carried out by a qualified electrician / automation specialist with the power disconnected.
    • Supply voltage – 24 VDC or 24 VAC ±10 %.
    • Device with a common ground: never connect its common ground to other devices powered by direct voltage (DC) – the connected devices may be damaged.
    • Resetting the Modbus communication parameters – with a jumper on PROG pins 1 and 2 for at least 5 s.
    • Install in a location not exposed to direct sunlight, with the probe in the airflow.

    Quick selection guide

    CO2 0–2000 ppm
    -30…+70 °C
    0–100 % rH
    0-10 VDC / 0-20 mA / PWM
    24 VDC / 24 VAC
    IP54
    Suitable when you need:
    • to implement demand-controlled ventilation by CO2 level;
    • to control an EC fan or damper directly from the sensor;
    • to integrate air quality data into a BMS via Modbus RTU.
    Check before use:
    • the input type of the controlled device;
    • the supply: 24 VDC or 24 VAC ±10 %;
    • whether the airflow in the duct is ≥ 1 m/s.
    Important reminder: The DCMFG-2R measures CO2 to assess indoor air quality; it is not a gas leak or safety detector.

    FAQ

    Does it measure VOC?
    No, CO2, temperature and relative humidity are measured.
    Can it be controlled by CO2 only?
    Yes, the temperature and humidity parameters can be disabled.
    What are the output signals?
    One output 0-10 VDC, 0-20 mA or PWM and 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 power supply does it operate from?
    24 VDC or 24 VAC ±10 %.

    Smart duct CO2 sensor-controller | CO2 0-2000ppm | T -30…70°C | 0-100%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DCMFG-2R

    Sentera DCMFG-2R – a smart duct CO2 sensor-controller: CO2 0–2000 ppm, temperature -30…+70 °C, humidity 0–100 % rH, control output 0-10 VDC / 0-20 mA / PWM and Modbus RTU, power supply 24 VDC or 24 VAC ±10 %. For demand-based ventilation.

    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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