CO₂, Humidity and Temperature Duct Mount Sensor

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  • Humidity
  • Temperature
  • CO₂


The EE850 is a 3 in 1 duct mounted sensor ideal for demand controlled ventilation and building automation. It combines CO₂, humidity and temperature in an innovative and functional enclosure. The EE850 incorporates the E+E dual wavelength NDIR CO₂ sensing element, which compensates for ageing effects, is highly insensitive to pollution and offers outstanding long term stability.

  • EE850 CO₂, humidity and temperature sensor for duct mounting

    The multi-point CO₂ and temperature factory adjustment leads to an excellent CO₂ measurement accuracy over the entire temperature working range.

    An optional adapter facilitates easy configuration and adjustment via the EE850 service interface.

    Typical Applications

    • Building automation
    • Demand controlled ventilation
    • Process control

    Key Features

    • E+E dual wavelength NDIR CO₂ working principle
    • CO₂ auto-calibration for excellent long term stability
    • Temperature compensation of the CO₂ measurement
    • High insensitivity to pollution
    • Humidity sensor protected by the E+E proprietary coating
    • Voltage or current outputs
    • Modbus RTU or BACnet MS/TP
    • Optional passive temperature sensor
    • Fast and easy installation
    • Easy user configuration and adjustment

    Technical data

    Measuring range CO₂
    0...2000 ppm
    0...10000 ppm
    Accuracy CO₂ - *mv - measured value
    < ± (50 ppm +2% of mv*)
    < ± (100 ppm +5% of mv*)
    Measuring range Humidity
    0...95 % RH
    Accuracy Humidity
    ±3 % RH (20...80 % RH)
    Measuring range Temperature
    -20...60 °C (-4...140 °F)
    Accuracy Temperature
    ±0.3 °C (±0.54 °F)
    Output analogue
    0-5 / 10 V or 4-20 mA
    Output digital
    Modbus RTU or BACnet MS/TP
    24 V AC/DC

    Calibrating your limits

    Your products and services can only be as precise as the tools you use to measure them. With more than 20 years of experience, the calibration team of E+E Elektronik focuses on providing a reliable service without any unnecessary delays or bias.

    Discover the value of working with an expert in calibration that prioritizes

    • accuracy,
    • fastness and
    • reliability

    Learn more

    Related products


    Downloads EE850

    Planning Data


    Transmitter with "two-wire" technology receive the power from the process, and the signal is carried on return wire (closed current loop). With "three-wires" technology the power supply is separate from current output: 2 wires are the power supply and the third carries the signal.

    All E+E CO₂ measuring devices feature an auto-calibration function. For details please refer to "Principles of CO₂ measurement".

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