User Manual EE895
Miniature Sensor Module for CO
2
, Temperature and Barometric Pressure | 5
WARNING
Non-compliance with the product documentation may cause accidents, personal injury or property damage.
▪
Mounting, installation, commissioning, start-up, operation and maintenance of the device may be
performed by qualified staff only. Such staff must be authorized by the operator of the facility to carry out
the mentioned activities.
▪
The qualified staff must have read and understood this user manual and must follow the instructions
contained within.
▪
All process and electrical connections shall be thoroughly checked by authorized staff before putting the
device into operation.
▪
Do not install or start-up a device supposed to be faulty. Make sure that such devices are not accidentally
used by marking them clearly as faulty.
▪
A faulty device shall be removed from the process.
▪
Service operations other than described in this user manual may only be performed by the manufacturer.
1.3 Environmental Aspects
PLEASE NOTE
Products from E+E Elektronik Ges.m.b.H. are developed and manufactured in compliance with all relevant
environmental protection requirements. Please observe local regulations for the disposal of the device.
For disposal, the individual components of the device must be separated according to local recycling
regulations. The electronics shall be disposed of correctly as electronics waste.
1.4 ESD Protection
The sensing elements and the electronics board are ESD (electrostatic discharge) sensitive components
of the device and must be handled as such. The failure to do so may damage the device by
electrostatic discharges when touching exposed sensitive components.
1.5 Product Description
Beside CO
2
concentration up to 10 000 ppm, the EE895 measures temperature (T) and absolute barometric
pressure (p). The active pressure and temperature compensation minimizes the impact of altitude and ambient
conditions on the CO
2
measured data.
The CO
2
, T and p measured data is available on I²C or UART digital interfaces. The solder pads, the plated half-
holes and the through-holes allow for various mounting options.
1.6 Operating Principle CO
2
Measurement
The CO
2
measurement is based on the dual wavelength Non Dispersive Infra-Red (NDIR) technology which
compensates for ageing effects, is highly insensitive to pollution and offers outstanding long term stability.
The infrared detector 1 (IR-1) is tuned to 4.2 μm, which is the wavelenght absorbed by CO
2
, the infrared detector
2 (IR-2) is tuned to 3.9 μm, which is not affected by any gas. For every single flash of the infrared lamp (IR-L), the
device calculates the CO
2
concentration from the outputs of both infrared detectors IR-1 and IR-2. The measuring
interval is user selectable (factory default: 15 s).
