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Sensors & Transmitters


Tel: 1-925-706-7433

ACI A/CO2-VDC Series Carbon Dioxide Sensor with Relay
ACI A/CO2-VDC Series Carbon Dioxide Sensor with Relay
    Quantity in Basket: None
    Code: ACACO2-VDC
    Price: $570.00
    Shipping Weight: 1.00 pounds
    [R] Room Mount - No Display
    [R-LCD] Room Mount with LCD Display (+$50)
      A/C02-Software (+$100)
    ACI A/CO2 Carbon Dioxide Transmitters

    The A/CO2 transmitters monitor carbon dioxide (CO2) levels in industrial and living environments from 0 to 10,000 ppm. The concentration of CO2 is a good indication of the indoor air quality (IAQ). All units come with both a 4-20 mA and 0-10 VDC analog output as well as a relay output with an adjustable setpoint and deadbank (Hysteresis). An optional LCD display may be added to the room unit while all the duct configurations come standard with the LCD display.

    The concentration of CO2 is measured using a Single Beam Absorption Infrared sensing method. The CO2 transmitter is also equipped with a patented ABC LogicTM (Automatic Background Calibration) software. The ABC LogicTM software virtually eliminates the need for manual calibration in applications where the indoor CO2 level drops to outside levels during unoccupied periods. The ABC LogicTM will not work properly in applications where the space is left unoccupied for less than 4 hours a day or where there are industrial sources of CO2.

    The room transmitter is encased in a white enclosure while the duct sensor is enclosed in a black case that is UL94-5V rated and includes a pitot tube.

    All units come with a two year factory warranty.

    Discounted Pricing available for contractors, resellers and volume purchases
    Contact us at Tel: 925-706-7433 or

    A/CO2 Specifications
    Supply Voltage 18 to 30 VAC RMS, 50/60 Hz or 18 to 42 VDC
    Power Consumption 1.75 VA average power, 2.75 VA peak power
    CO2 Analog Output Signals 4 to 20 mA (RL max = 500 Ohms)
    0 to 10 VDC (100 Ohms output impedance)
    Accuracy @ 72°F (22°C) +/- 40 ppm + 3% of reading
    Response Time 0 to 90% < 2 minutes
    Operating Temperature 32 to 122°F (0 to 50°C)
    Operating RH Range 0 to 95% RH, non-condensing
    CO2 Measurement Range 0 to 2000 ppm (Factory Set), Adjustable to 10,000 ppm
    Digital I/O RS232 Interface for use with optional PC UIP Kit #2072
    Relay Output N/O or N/C 2A max @ 24VAC contact Rating, Factory
    Set at 1000 ppm with 50 ppm Hysteresis
    Calibration Time 5 Years / Zero ppm with a 50 ppm Hysteresis

    Sampling Method

    Room: Single Beam Infrared Diffusion
    Digital Display
    0 to 10,000 ppm (Optional)
    PDF File A/CO2 4-20mA Brochure A/CO2 Installation Manual

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