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

~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

diffusion

Response Time (T_1/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

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

Sensor

SHT11 from Sensirion

Measurement Range

-40 to 60°C

Accuracy ^{6, 7}

±0.4°C at 25°C

Relative Humidity Measurement

Sensor

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)