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Miniature-Sensor Module for CO₂, Temperature and Barometric Pressure

EE895

The EE895 3-in-1 sensor module is an ideal choice for measuring devices for demand controlled ventilation, building automation or for process control. Due to the low power consumption, the module is also suitable for battery-operated devices such as hand-held meters, data loggers or wireless transmitters.

EE895 CO₂ temperature and ambient pressure module

EE895 Evaluation Board with sensor module

The EE895 provides the CO₂ Guard 10 a high CO₂ measuring accuracy

A Single Module – 3 Measurands
The EE895 module measures not only the CO₂ concentration up to 10,000 ppm (1% CO₂) but also the temperature (T) and ambient pressure (p). The pressure and temperature compensation with on-board sensors minimizes the impact of the environment onto the CO₂ measurement. As a result, the EE895 offers a particularly high CO₂ measurement accuracy, independent of altitude or changing ambient conditions.

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

Easy Design-In
The I²C and UART interfaces, 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 configured via the digital interface. The CO₂ measurement interval can be set according to the application and the power requirements.

EE895 Evaluation Board for Test Purposes
The evaluation board, which is available as an accessory, allows easy testing of the EE895 with a view to the intended application. It is connected to the PC via a USB cable. Using the sensor evaluation software, which is available free of charge, the measurement data can be visualised and logged. Users have the option to set the EE895’s measurement interval, and the desired measurement units for temperature and pressure.

Design Data and Support Literature
The electronic design data of the EE895 is available free of charge from the download area of the E+E website. This means that the 3D data from the sensing module can be quickly and easily transferred to a CAD design tool. Using the I²C interface, the EE895 module can be connected to various single board computers such as the Arduino or Raspberry Pi. Step-by-step instructions (available from the download area) help you program and integrate the EE895 into your application.

Typical Applications

Demand controlled ventilation
Building automation
Process control
Data loggers, hand-held instruments
Wireless transmitters

For CO2 Traffic Lights and Indoor Climate Sensors

The EE895 sensing module is perfect for use in CO2 traffic lights and other measuring devices for indoor climate monitoring.

For example, the sensing module provides precise and long-term stable CO2 measurements in the CO2 Guard 10 by E+E Elektronik or in the StreamLine CO2 and air quality sensors.

The small dimensions allow for easy integration of the module even in tight spaces. Its low power consumption is particularly advantageous for battery-powered devices.

Key Features

Dual wavelength NDIR with autocalibration
T and p compensation of the CO₂ measurement
Very low power consumption and peak current
I²C or UART interface

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 Pressure 700…1100 mbar (10.15...15.95 psi)	Accuracy Pressure at 25 °C (77 °C) 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 UART	Supply 3.3 - 5V DC