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  • New item   -147.66€Duct CO2 sensor | CO2 0-2000ppm | T -30…70°C | 0-100%rH | NDIR | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DSCDG0-4
    New item   -147.66€Duct CO2 sensor | CO2 0-2000ppm | T -30…70°C | 0-100%rH | NDIR | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DSCDG0-4 1
    New item   -147.66€Duct CO2 sensor | CO2 0-2000ppm | T -30…70°C | 0-100%rH | NDIR | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DSCDG0-4 2
    New item   -147.66€Duct CO2 sensor | CO2 0-2000ppm | T -30…70°C | 0-100%rH | NDIR | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DSCDG0-4 3

    Duct CO2 sensor | CO2 0-2000ppm | T -30…70°C | 0-100%rH | NDIR | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DSCDG0-4

    Code: DSCDG0-4
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  • Product description

    Duct CO2 sensor | CO2 0-2000ppm | T -30…70°C | 0-100%rH | NDIR | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DSCDG0-4

    DSCDG0-4 – a Sentera Controls duct CO2 sensor that measures CO2 concentration (0–2000 ppm), temperature (-30…+70 °C) and relative humidity (0–100 % rH) in the duct and has a digital Modbus RTU output (no analog outputs). Supply – 24 VDC or 24 VAC ±10 %.

    Key idea:
    A digital CO2, temperature and humidity transmitter for BMS systems: all data and alarm thresholds are in Modbus registers, with no analog signals and no scaling to match.
    CO2 range
    0–2000 ppm
    Output
    Modbus RTU
    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), while the 24 VDC or 24 VAC power supply and Modbus RTU (VIN, GND, A, B) are connected to the removable screw terminal with Cat5 or EIB cable.

    An NDIR (non-dispersive infrared) CO2 sensor with ABC automatic self-calibration – for it to work, CO2 must fall to ~400 ppm (outdoor air level) at least once every 7 days – together with a temperature and humidity sensor measures the duct air. All measurements and alarm limits (temperature, humidity, dew point difference, CO2) are in Modbus RTU registers; the firmware is updated via Modbus RTU or SenteraWeb (through the Sentera internet gateway).

    Result – the controller or BMS receives accurate (CO2 ±30 ppm) duct air data via digital communication and ventilates according to the actual number of people, reducing heating / cooling losses and fan energy consumption.

    Benefits DSCDG0-4?
    CO2, temperature, humidity and alarm limits in one Modbus device – simple BMS integration without analog cables.

    Technical specifications

    Product type Duct CO2 sensor
    Manufacturer / code Sentera Controls / DSCDG0-4
    Measured quantities CO2, temperature, relative humidity; dew point difference (for alarms)
    CO2 range 0–2000 ppm
    Temperature range -30…+70 °C
    Humidity range 0–100 % rH, non-condensing
    Accuracy CO2 ±30 ppm; ±0.4 °C; ±2.5 % rH
    CO2 sensor NDIR, ABC automatic self-calibration
    Outputs Modbus RTU only, no analog outputs
    Communication Modbus RTU (RS485); firmware update via Modbus RTU
    Supply voltage 24 VDC or 24 VAC ±10 %
    Max. current (Imax) 40 mA
    Protection Supply overvoltage protection
    Indication Power, system, RX and TX LEDs
    Min. air velocity 1 m/s
    Housing ABS plastic, grey
    Protection class IP54 housing, IP20 probe
    Operating conditions -10…+50 °C, 10–90 % rH non-condensing
    Weight 0.15 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

    • NDIR CO2 with ABC – automatic self-calibration compensates for sensor drift.
    • Alarm limits – for temperature, humidity, dew point margin and CO2 – in Modbus registers.
    • Overvoltage protection – in the power supply circuit.
    • Modbus RTU – all measurements and settings are accessible remotely.
    • Firmware update – via Modbus RTU or SenteraWeb.
    • 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?

    • 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
    • Office building BMS with many CO2 measuring points
    • Sites with SenteraWeb remote monitoring

    On-demand operation

    For digital BMS integrators.
    CO2, T, rH and alarm limits are available in Modbus RTU registers, with no analog inputs.
    For air handling unit automation programmers.
    An NDIR CO2 sensor with ABC and alarm registers allows the ventilation logic to be built in the controller.
    For building energy managers.
    Data via SenteraWeb allows remote monitoring of air quality and alarms.

    Practical application

    If an office building BMS has a Modbus RTU line and extract air CO2 has to be measured in several units, then the DSCDG0-4 units are connected to the same line with 24 VAC/VDC power, and the BMS reads the CO2 (0–2000 ppm) and alarm registers.

    Application guide: how it is used in practice

    The same DSCDG0-4 adapts to different sites – only what is connected to its outputs changes:

    Site What is connected Result Installer's note
    Building with BMS Modbus RTU → A, B CO2, T and rH are monitored and archived centrally Cat5 or EIB cable
    Sentera controller with Modbus Modbus RTU → Sentera controller / speed controller Ventilation based on extract air CO2 A separate address for each device
    Remote monitoring Modbus RTU → Sentera internet gateway → SenteraWeb Warnings and remote firmware updates A Sentera internet gateway is required
    Condensation control Modbus – dew point difference alarm Warning about condensation risk in the duct Set the limits in HR33–HR34

    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)
    Duct, NDIR CO2 + T + rH, Modbus RTU only DSCDG0-4 (no analog outputs) ← this model
    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 analog outputs – DSCDG3-4; for direct control with a single signal – DCMFG-2R; in a room – RSMF-3 series; without CO2 – DSTH-3 series.

    Pros

    • CO2, temperature and humidity in one device
    • Modbus RTU, firmware updated over the network
    • Alarm limits in Modbus registers
    • NDIR CO2 with ABC self-calibration
    • IP54 housing

    Cons / limitations

    • No analog outputs – a Modbus RTU controller or BMS is required
    • ABC self-calibration requires the CO2 level to drop to ~400 ppm at least once every 7 days – not suitable for permanently occupied rooms without switching it off
    • IP20 probe, an airflow of ≥ 1 m/s is required

    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
    Modbus RTU
    24 VDC / 24 VAC
    IP54
    Suitable when you need:
    • to implement demand-controlled ventilation by CO2 level;
    • to pass CO2, temperature and humidity to a controller or BMS;
    • to integrate air quality data into a BMS via Modbus RTU.
    Check before use:
    • whether the controller / BMS supports Modbus RTU;
    • the supply: 24 VDC or 24 VAC ±10 %;
    • whether the airflow in the duct is ≥ 1 m/s.
    Important reminder: The DSCDG0-4 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.
    What are the output signals?
    Modbus RTU only; for analog outputs choose DSCDG3-4.
    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 %.
    How does ABC self-calibration work?
    The lowest CO2 value measured over 7 days is taken as the ~400 ppm baseline, so CO2 must fall to the outdoor air level at least once every 7 days.

    Duct CO2 sensor | CO2 0-2000ppm | T -30…70°C | 0-100%rH | NDIR | Modbus RTU | 24VAC/VDC | IP54 | Sentera Controls | DSCDG0-4

    Sentera DSCDG0-4 – a duct CO2 sensor: CO2 0–2000 ppm, temperature -30…+70 °C, humidity 0–100 % rH, data and alarm limits via Modbus RTU, 24 VDC or 24 VAC ±10 % power 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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