CO₂, Module Measures Four Climate Parameters


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.

An optional kit for the E2 interface facilitates easy configuration of the module and the adjustment of the CO₂, RH, T and p measurement. 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 % mv*)
± (50 ppm + 3 % mv*)
± (100 ppm + 5 % 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
4.75 - 7.5V DC

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