Sensing Module for CO₂, Humidity, Temperature and Barometric Pressure
EE894
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, 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
- 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
- Measuring range CO₂
- 0...2000 ppm0...5000 ppm0...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
- Supply
- 4.75-7.5V DC
Custom solutions for precise results
For more than 40 years, E+E Elektronik has been developing and manufacturing its highly precise and long-term stable sensors exclusively at its headquarters in Engerwitzdorf, Austria. The high level of vertical integration – from the sensor element to the precisely calibrated measuring device – ensures compliance with the highest quality standards and enables a quick response to customer-specific requirements.
E+E Elektronik offers:
- Accredited sensor calibration for the highest quality standards
- Efficient service – worldwide through local offices
- Short delivery times
Latest news at E+E
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Downloads EE894
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