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  • New item   -147.16€Smart multifunction CO2 room sensor-controller | CO2 400-2000ppm | T 0…50°C | 0-95%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP30 | Sentera Controls | RCMFG-3
    New item   -147.16€Smart multifunction CO2 room sensor-controller | CO2 400-2000ppm | T 0…50°C | 0-95%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP30 | Sentera Controls | RCMFG-3 1
    New item   -147.16€Smart multifunction CO2 room sensor-controller | CO2 400-2000ppm | T 0…50°C | 0-95%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP30 | Sentera Controls | RCMFG-3 2
    New item   -147.16€Smart multifunction CO2 room sensor-controller | CO2 400-2000ppm | T 0…50°C | 0-95%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP30 | Sentera Controls | RCMFG-3 3
    New item   -147.16€Smart multifunction CO2 room sensor-controller | CO2 400-2000ppm | T 0…50°C | 0-95%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP30 | Sentera Controls | RCMFG-3 4
    New item   -147.16€Smart multifunction CO2 room sensor-controller | CO2 400-2000ppm | T 0…50°C | 0-95%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP30 | Sentera Controls | RCMFG-3 5

    Smart multifunction CO2 room sensor-controller | CO2 400-2000ppm | T 0…50°C | 0-95%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP30 | Sentera Controls | RCMFG-3

    Code: RCMFG-3
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  • Product description

    Smart multifunction CO2 room sensor-controller | CO2 400-2000ppm | T 0…50°C | 0-95%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP30 | Sentera Controls | RCMFG-3

    The RCMFG-3 is a Sentera Controls smart multifunction CO2 room sensor-controller that measures CO2 concentration (400–2000 ppm), temperature (0…+50 °C) and relative humidity (0–95 % rH) in a room and has a single 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. Power 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
    400–2000 ppm
    Output
    1 × 0-10 VDC / 0-20 mA / PWM
    Power supply
    24 VDC or 24 VAC ±10 %
    Protection
    IP30, indoors only

    Operating principle

    The device is wall-mounted in the room (2 holes Ø 6 mm), in the occupied zone, away from doors, windows and direct exhalation. 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 self-calibrating CO2 sensor together with a temperature and humidity sensor measures air quality; a range is set for each quantity, and the output (0–100 %) follows the highest of the three calculated values. Output type – 0-10 VDC (≥ 50 kΩ), 0-20 mA (≤ 500 Ω) or PWM 1 kHz (3.3 or 12 VDC), so it directly controls an EC fan, an AC fan speed controller or a damper actuator; all parameters are accessible via Modbus RTU.

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

    Benefits RCMFG-3?
    CO2, temperature, humidity and a control algorithm in one device – demand-controlled ventilation without a separate controller or programming.

    Technical specifications

    Product type Smart multifunction CO2 room sensor-controller
    Manufacturer / code Sentera Controls / RCMFG-3
    Measured quantities CO2, temperature, relative humidity, ambient light level
    CO2 range 400–2000 ppm (accuracy specified up to 5000 ppm)
    Temperature range 0…+50 °C
    Humidity range 0–95 % rH, non-condensing
    Accuracy ±0.5 °C (5…50 °C); ±6 % rH (20–80 %); CO2 ±(50 ppm + 3 % of reading) 400–2000 ppm, ±(40 ppm + 5 % of reading) 2001–5000 ppm
    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 %
    Max. current (Imax) 50 mA (DC) / 120 mA (AC)
    Indication Red / yellow / green LED with adjustable brightness, ambient light sensor
    Installation On a wall, 2 holes Ø 6 mm
    Protection class IP30 (EN 60529), indoor use only
    Weight 0.092 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 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.
    • LED indication – green – air quality is good, yellow – warning level 1 reached, red – level 2 or value out of range.
    • Light sensor – adjustable “active” and “standby” illumination levels.
    • SenteraWeb – via a Sentera internet gateway – remote monitoring, log, notifications, mode schedules.
    • Configuration – Configuration and monitoring – the free Sentera 3SModbus software (via the CNVT-USB-RS485 converter) or the Sensistant Modbus configurator.

    Where is it used?

    • Offices, meeting rooms, classrooms
    • Kindergartens, schools, auditoriums
    • Residential rooms and apartments
    • Restaurants, gyms
    • Demand-controlled ventilation with EC fans
    • BMS and SenteraWeb systems

    On-demand operation

    For the office demand-controlled ventilation designer.
    A single wall-mounted device directly controls a fan or VAV damper according to the highest of CO2, T and rH.
    For the 24 VAC automation installer.
    The -G version is powered from an existing 24 VAC transformer or 24 VDC.
    For sports hall administrators.
    Ventilation automatically increases when people gather and slows down in an empty hall.

    Practical application

    If the VAV damper actuator of a sports hall is controlled with a 0-10 VDC signal and the supply is 24 VAC, then the RCMFG-3 is connected directly to the actuator and proportionally opens it as CO2 rises above the start of the set range.

    Application guide: how it is used in practice

    The same RCMFG-3 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) ← this model
    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)
    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 T / rH / CO2 signals – RSMF-3 series; for flush mounting – FCMF8-R / FCMFG-R; for a duct – DCMFG-2R; without CO2 – RCTH-2 series.

    Pros

    • CO2, temperature and humidity in one device
    • Modbus RTU, firmware updated over the network
    • Integrated control algorithm – no separate controller needed
    • Self-calibrating CO2 sensor, LED with adjustable brightness
    • Compact wall-mounted housing

    Cons / limitations

    • One control output – for separate signals choose a transmitter
    • CO2 measuring range 400–2000 ppm – intended for indoor air quality, not for industrial gas monitoring
    • IP30 – dry rooms only

    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 %.
    • The -G version: 3-wire connection with a common ground (the analog output GND is connected to the supply GND). Never connect the common ground of the G version to devices powered by direct voltage (DC) – the connected devices may be damaged.
    • 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.
    • For indoor use only; do not install in direct sunlight.

    Quick selection guide

    CO2 400–2000 ppm
    0…+50 °C
    0–95 % rH
    0-10 VDC / 0-20 mA / PWM
    24 VDC / 24 VAC
    IP30
    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 %;
    • the installation location – an occupied zone, not near doors or windows.
    Important reminder: The RCMFG-3 measures CO2 to assess indoor air quality; it is not a gas leak or safety detector.

    FAQ

    Does it measure VOC?
    No, CO2, temperature, relative humidity and ambient light 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 multifunction CO2 room sensor-controller | CO2 400-2000ppm | T 0…50°C | 0-95%rH | 0-10VDC/0-20mA/PWM | Modbus RTU | 24VAC/VDC | IP30 | Sentera Controls | RCMFG-3

    Sentera RCMFG-3 – smart multifunction CO2 room sensor-controller: CO2 400–2000 ppm, temperature 0…+50 °C, humidity 0–95 % rH, 0-10 VDC / 0-20 mA / PWM control output and Modbus RTU, 24 VDC or 24 VAC ±10 % supply. For demand-controlled 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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