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SILAREXCEMS Multi Gas NDIR sensor
3 active measurement channels
Ready to use calibrated
On board cross compensation
On board pressure compensation
Modbus ASCII/RTU, autobaud, autoframe
Status indicated by LED

NDIR Multi-Gas Sensor for CEMS
CO2 20 Vol.-% // NO 2000 ppm // SO2 1000 ppm
smartGAS item number: SX-300003-00000

Application Examples
Emission monitoring CEMS
BiogasProcess measurement

Available as
2-Channel
3-Channel

Accessories
Insulation housing
Gas cooler
Particle filter
Gas pump
Mounting equipment

smartGAS Mikrosensorik GmbH I Huenderstr. 1 I 74080 Heilbronn I Germany
T +49 7131 797553-0 I F +49 7131 797553-10 I sales@smartgas.eu I www.smartgas.eu

Available design in support
Mechanical Installation
Data communication
Gas pre-treatment

DS_SX-300003-00000_CO2_NO_SO2
Edition 02_07/2021

SILAREX I CO2 // NO // SO2 I SX-300003-00000
General features
Measurement principle:

Channel 1:

Channel 2:

Channel 3:

CO2NO

SO2

FS = 20 Vol.-%

FS = 2000 ppm

FS = 1000 ppm

0.01 Vol.-%

1 ppm

1 ppm

0.03 Vol.-% /0.02 Vol.-% /0.01 Vol.-%

17 ppm /11 ppm /6 ppm

3 ppm /
2 ppm /
1 ppm

≤ ± 0.06 Vol.-%≤ ± 10 ppm≤ ± 4 ppm

Non Dispersive Infra-Red (NDIR),
dual wavelength

Target gas:Measurement range:

0 … Full Scale (FS)Gas supply:

by flow (nearly atmospheric pressure)

Flow rate:

0.1 ... 1.0 l / min

Mounting dimensions:

336 mm x 40 mm x 55 mm (L x W x H)

Warm-up time:< 2 minutes (start up time)< 30 minutes (full specification)

Measuring response*Response time (t90) @ 0.7 l / min:< 4 s (fast), < 8 s (medium), < 60 s (slow)

Digital resolution:
Detection limit (3 σ) max.:

in fast / medium / slow mode:

Repeatability:
Linearity error (straight line deviation):≤ ± 0.1 Vol.-%≤ ± 13 ppm≤ ± 9 ppm

Long term stability (zero):

after 1000 h operating time

≤ ± 0.01 Vol.-%≤ ± 35 ppm≤ ± 15 ppm

Long term stability (span):after 1000 h operating time

≤ ± 0.02 Vol.-%≤ ± 50 ppm≤ ± 20 ppm

Influence of T, P, flow rate, other*
Temp. dependence (zero):with thermal isolation, heater on≤ ± 0.005 Vol.-% per °C≤ ± 75 ppm per °C≤ ± 3 ppm per °C

Temp. dependence (span):with thermal isolation, heater on≤ ± 0.01 Vol.-% per °C≤ ± 150 ppm per °C≤ ± 6 ppm per °C

Pressure dependence:pressure compensated, residual error in %of actual reading / hPa≤ ± 0.02≤ ± 0.02≤ ± 0.02≤ ± 0.02 Vol.-%≤ ± 2 ppm

≤ ± 1 ppm

≤ ± 0.01 Vol.-%≤ ± 0.01 Vol.-%< ± 15 ppm< ± 2 ppm

< ± 1 ppm
< ± 2 ppm
-Flow rate dependence per 0.1 l / min:Cross sensitivity (zero) other gases:@ 20 Vol.-% CO2 (at 42 °C stable):@ 2000 ppm NO (at 42 °C stable):@ 1000 ppm SO2 (at 42 °C stable):Electrical inputs and outputs
Supply voltage:

24 V DC + 10 %Average power consumption< 6 W (while heater on) // < 1 W (at stabilized temperature)

Inrush current:< 400 mA

Digital output signal

Modbus ASCII / RTU via RS485, autobaud, autoframe

Calibration

Zero and Span via Modbus ASCII / RTU

Climatic conditions*Sensor heating temperature

42 °C

Operating ambient temperature:

appr. + 10 … + 40 °C (thermal isolation required)

Storage temperature:-20 °C … + 60 °C

Air pressure:800 … 1150 hPa

Ambient humidity:

0 … 95 % rel. H. (not condensing)

Typical values related to 1013 hPa, Ta = 22 °C, flow = 0.7 l / min for dry (not condensing) and clean sample gas. Stated values exclude
calibration gas tolerance.

All rights reserved. Any logos and/or product names are trademarks of smartGAS. The reproduction, transfer, distribution or storage of information contained inthis brochure in any form without the prior written consent of smartGAS is strictly prohibited. All specifications – technical included – are subject to change
without notice. Depending on the application, the target gas and the measurement range the technical data may differ. No liability is accepted for any
consequential losses, injury or damage resulting from the use of this document or from any omissions or errors herein. The data is given for guidance only. It does
not constitute a specification or an offer for sale.
For more information, please visit www.smartgas.eu or contact us at sales@smartgas.eu
Please consult smartGAS sales for parts specified with other temperature and measurement ranges. At first initiation and depending on application and ambientconditions recalibration is recommended. Recurring cycles of recalibration are recommended.
smartGAS Mikrosensorik GmbH I Huenderstr. 1 I 74080 Heilbronn I Germany
T +49 7131 797553-0 I F +49 7131 797553-10 I sales@smartgas.eu I www.smartgas.eu

DS_SX-300003-00000_CO2_NO_SO2
Edition 02_07/2021