Miniature Sensor Module Measures CO2, Temperature and Pressure

Abb. 1: EE895 Sensormodul für CO2, Temperatur und Umgebungsdruck. (Foto: E+E Elektronik Ges.m.b.H.) / Fig. 1: EE895 sensor module for CO2, temperature and pressure. (Photo: E+E Elektronik GmbH)

Abb. 2: Das EE895 Evaluation Board ermöglicht ein einfaches Testen des Sensormoduls am PC. (Foto: E+E Elektronik Ges.m.b.H.) / Fig. 2: The EE895 Evaluation Board facilitates testing of the sensor module on a PC. (Photo: E+E Elektronik GmbH)

The new EE895 sensor module from E+E Elektronik measures CO2, temperature and ambient pressure. The small 3-in-1 module is an ideal choice for measuring instruments used for ventilation and climate control, in building automation or for process control. Due to its low power consumption, the module is also suitable for battery-operated devices such as hand-held meters, data loggers or wireless transmitters. The temperature and pressure compensation ensures high CO2 measurement accuracy under changing environmental conditions.

A Single Module – 3 Measurands

Additionally to CO2 concentration up to 10 000 ppm the EE895 module measures also the temperature and ambient pressure. The pressure and temperature compensation with on-board sensors minimizes the environmental influences onto the CO2 measurement. Thus the module offers a constantly high CO2 measurement accuracy, independent of altitude or changing ambient conditions.

Long-Term Stable CO2 Measurement Principle

The dual wavelength NDIR CO2 measuring principle with auto-calibration ensures long-term stable measurements, as it automatically compensates for aging effects and is particularly resistant to contamination. The factory multi-point CO2 and temperature adjustment procedure leads to an excellent CO2 measurement accuracy over the entire temperature working range of -40...60 °C (-40...140 °F).

Easy Design-In

The measured data for CO2, temperature and pressure is available on the I2C or UART interface. The very small dimensions of only 35 mm x 15 mm x 7 mm (1.38" x 0.6" x 0.27") and various mounting options facilitate the design-in of the sensor module.

Flexibly Configurable

The EE895 module can be flexibly configured via the digital interface. The CO2 measurement interval can be set according to the application and the power requirements.

Evaluation Board for Testing on a PC

With the separately available EE895 Evaluation Board, the sensor module can be tested on a PC. The free evaluation software displays the measurement data in graphical form and allows the user to set the sampling rate and the measurement units for temperature and pressure. For further processing, the data can be saved as .CSV file.