NDIR CO2 Sensor Module for Environment Parameters Logging - CO2 Engine ELG

  • NDIR CO2 Sensor Module for Environment Parameters Logging
  • NDIR CO2 Sensor Module for Environment Parameters Logging
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▪ Measurement range CO2: 0 to 5000 ppm(CO2)
▪ Measurement range RH: 0 to 100%
▪ Measurement range °C: -40 to 60
▪ Low power consumption
▪ Internal logger
▪ Maintenance-free
▪ Stand-by mode

  • Model Number: CO2 Engine ELG
  • Data Sheet: Date Sheet File
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Product Specification

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 SenseAir’s 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


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


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

~250μA (1 measurement/hour)

~50μA 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


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


±20 ppm±1 % of measured value

Accuracy 5

±30 ppm±3 % of measured value

Pressure Dependence

+ 1.6 % reading per kPa deviation from normal pressure, 100 kPa

On-board calibration support

Din1 switch input to trigger Background Calibration @ 400

ppm (0.04%vol) CO2

Din2 switch input to trigger Zero Calibration @ 0 ppm CO2

Temperature Measurement


SHT11 from Sensirion

Measurement Range

-40 to 60°C

Accuracy 6, 7

±0.4°C at 25°C

Relative Humidity Measurement


SHT11 from Sensirion

Measurement Range

0 to 100% RH non condensing

Accuracy 6 , 7

±3% RH

Logger properties

Logger Capacity

5400 logging points if CO2 concentration, temperature and

relative humidity are logged (with timestamp)

Logging Data

Selectable, one data record can contain up to 14 bytes (max 4 variables)

Logging Period

(1…255) * Measurement Period

Delay since setting jumper

0 to 255 seconds (5s in default configuration)

1 SO2 enriched environments are excluded.
2 Sensors are 100% tested in production at 45C / 85%RH / 1000ppm CO2  for one hour. For applications operating continuously in high humidity, contact SenseAir for further information.
3 Different options exist and can be customized depending on the application. Please, contact SenseAir for further information!
4 Notice that absolute maximum rating is 12V, so sensor can not be used with 12V+-10% supply.
5 Accuracy is specified over operating temperature range at normal pressure 1013 mBar. Specification is referenced to certified calibration mixtures. Uncertainty of calibration gas mixtures (+-2% currently) is to be added to the specified accuracy for absolute measurements.
6 Specification is provided by Sensirion.
7 Minimum 5 minutes measurement period.

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