CO₂ Module Measures Four Climate Parameters

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  • CO₂
  • Pressure
  • Temperature
  • Humidity


The digital module EE894 measures carbon dioxide (CO₂), relative humidity (RH), temperature (T) and ambient pressure (p). Temperature and pressure compensation ensures high CO₂ measurement accuracy under changing environmental conditions. Very small dimension and the I2C or E2 interface facilitate the design-in.

  • EE894 Compact - CO₂, relative humidity, temperature and ambient pressure module

  • EE894 Standard - CO₂, relative humidity, temperature and ambient pressure module

    The dual wavelength NDIR technology with auto-calibration is particularly long-term stable and insensitive to contamination. A multiple point CO₂ and T factory adjustment leads to excellent CO₂ measurement accuracy over the entire T working range. The pressure compensation minimizes the impact of altitude and ambient pressure variations onto the CO₂ readings.

    The measured data, with a range of up to 1% CO₂, is available on the I²C or the E2 digital interface. Small dimensions and electrical connection via contact pins, edge card socket or pads facilitate the design-in.

    The CO₂ measurement interval can be set according to the application requirements; by this the average current consumption can be reduced to 420 μA, ideal for battery-operated devices.

    Typical Applications

    • Demand controlled ventilation
    • Building automation
    • Data loggers and hand helds
    • Wireless transmitters

    Key Features

    • Dual wavelength NDIR CO₂ working principle
    • Measuring range up to 10,000ppm
    • Auto-calibration for excellent long term stability
    • Temperature and pressure compensation
    • High insensitivity to pollution
    • Easy user configuration and adjustment
    • Very low current consumption
    • Miniature size

    Technical data

    Measuring range CO₂
    0...2000 ppm
    0...5000 ppm
    0...10000 ppm
    Accuracy CO₂ at 25 °C (77 °F) and 1013 mbar (14.69 psi)
    ±(50 ppm +2% of mv)
    ±(50 ppm +3% of mv)
    ±(100 ppm +5% of mv)
    Measuring range Relative Humidity
    0…95 % RH (non condensing)
    Accuracy Relative Humidity at 25 °C (77 °C) and 20...80% RH
    typ. ± 3 % RH
    Measuring range Pressure
    700…1100 mbar (10.15...15.95 psi)
    Accuracy Pressure at 25 °C (77 °C) and 20...80% RH
    typ. ± 2 mbar
    Measuring range Temperature
    -40…60 °C (-40...140 °F)
    Accuracy Temperature at 25 °C (77 °F)
    typ. ± 0.5 °C (± 0.9 °F)
    Digital interface
    I²C or E2
    4.75-7.5V DC

    Downloads EE894

    Electronic Design Data
    Declarations of Conformity
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