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CO2 Engine ELG Sensor module for environment parameters logging CO2 Engine ELG NDIR CO2 Sensor Module General This document describes a family of sensor modules CO2 Engine ELG designed to measure and store records of environmental parameters such as - Temperature - Relative Humidity - CO2 concentration (up to 5000ppm range). The sensor module CO2 Engine ELG is designed for battery powered operation with low average power consumption without compromising measurement precision and resolution. Virtual RTC (Real Time Clock) allows data and events logging with time stamps. Events include sensor power on, logging start/stop, ABC self calibration, user initiated zero and background calibrations. Reading of logger via I2C connector and SenseAirs I2C - USB bridge (SADK). I2C or UART communication can be used to read logged data for built in modules. CO2 Engine ELGNDIR CO2 Sensor Module Applications This platform is designed to be an OEM module for built-in applications in a host apparatus and suits low power applications. CO2 Engine ELG NDIR CO2 Sensor Module Technical specification
Item
CO2 Engine ELG Art. No:. 033-8-0007
General performance
Storage Temperature Range
-40 to +70°C
Storage Environment
Non condensing, non corrosive environment 1
Operating Temperature Range
0 to 50°C
Operating Humidity Range
0 to 95% RH (non-condensing) 2
Operating Environment
Non corrosive environment 2 . Residential, commercial,
industrial spaces used in HVAC (Heating Ventilation and Air-
Conditioning) systems 3
Sensor Life Expectancy
> 10 years
Maintenance Interval
Maintenance-free. See discussion of ABC algorithm on page 10
Self-Diagnostics
complete function check of the sensor module
Conformance with Standards
RoHS directive 2011/65/EU
Electrical / Mechanical
Power Input
4.75-12 VDC 4 max rating, stabilized to within 10%
powering sensor via Vbat+
5.5-12 VDC 4 max rating, stabilized to within 10% powering
sensor via G+ (on board protection circuits)
Current Consumption
~250A (1 measurement/hour)
~50A in sleep
~60 mA average during active measurement sequence (~12s)
< 150 mA peak current (averaged during IR lamp ON, 100 msec)
< 250 mA peak power (during IR lamp start-up, the first 50 msec)
for maximum operating time (if powered by batteries),
choose batteries that can deliver 250mA pulses without
large voltage drops (for example batteries recommended for cameras)
Electrical Connections
Vbat+, G+ and G0
Dimensions (mm)
51 x 57 x 12 mm (Length x Width x Height) for ELG
(0..5000ppm measurement range)
CO2 measurement
Sensing Method
non-dispersive infrared (NDIR) waveguide technology with ABC,
automatic background calibration algorithm (application specific)
Sampling Method
diffusion
Response Time (T1/e )
<25 sec gas diffusion time
Measurement Period
5 min to 0.5 year interval, a measurement period less than 5
min can be used, but then specified accuracy on RH and
temperature measurements are not guaranteed
Repeatability
±20 ppm±1 % of measured value
Accuracy 5
±30 ppm±3 % of measured value
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