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.
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 and edge card socket 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.
- 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
- Demand controlled ventilation
- Building automation
- Data loggers and hand helds
- Wireless transmitters
0...2000 ppmMeasuring range CO2
±(50 ppm +2% of mv)Accuracy CO2 at 25 °C (77 °F) and 1013 mbar (14.69 psi)
±(50 ppm +3% of mv)
±(100 ppm +5% of mv)
0…95 % RH (non condensing)Measuring range Relative Humidity
typ. ± 3 % RHAccuracy Relative Humidity at 25 °C (77 °C) and 20...80% RH
700…1100 mbar (10.15...15.95 psi)Measuring range Pressure
typ. ± 2 mbarAccuracy Pressure at 25 °C (77 °C) and 20...80% RH
-40…60 °C (-40...140 °F)Measuring range Temperature
typ. ± 0.5 °C (± 0.9 °F)Accuracy Temperature at 25 °C (77 °F)
I²C or E2Digital interface
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EE894 Datasheet(1079.79 kb)
EE894 Handling instruction(1039.37 kb)
EE-PCS Product Configuration Software(25082.54 kb)
E2 interface specification(273.28 kb)
Protocol Description I²C(1179.63 kb)