Release date: 10-Nov-2023
MADE IN GERMANY

SILAREXInfrared Gas Sensor
Channel 1: FS = 25 Vol.-% CO2
Channel 2: FS = 2000 ppm COChannel 3:
smartGAS item number: SX-200019-00000

Product features:- Measure up to 3 gases
or different concentration ranges
simultaneously- Cross-sensitivity is calculated
on-board- Pressure compensation on board- Temperature and driftcompensated- Ready to use calibrated

SILAREX gas sensors have been developed to enable parallel concentration measurement of up tothree measuring gases or three detection ranges with one single NDIR gas sensor. The crosssensitivities of the individual gases are compensated directly inside the SILAREX sensor, providing
the user with fully prepared and corrected measuring values via Modbus ASCII / RTU for further
processing. An on-board pressure compensation and heaters guarantee stable measurement results.
Compared to measuring with three individual sensors, the advantages are obvious: Only one sensor
needs to be calibrated and maintained; varying sample preparation, different accuracies or life
cycles of the sensors do not need to be considered.

Application Examples

Available equipment

for SILAREX series

Gas cooler

Available design insupport

Gas analysis

Heater element

Mechanical installation

Environmental monitoring

Case

Data communication

TOCParticle filter

Gas pre-treatment

CEMS

Gas pump

Operating conditions

Medical breath control

Mounting equipment

Customized ranges… and more

Customized gas typesmartGAS Mikrosensorik GmbHsmartGAS Sensor Technology Co., Ltd

smartGAS US-OfficeHuenderstrasse 174080 Heilbronn
Germany
T +49 (0) 7131 797553-0
sales@smartgas.eu
www.smartgas.eu

Building 16, No. 59 Jiangnan Rd. CEDZ Changshu,Jiangsu
China
T +86 (0) 512-83380880
info@smartgas-cn.com
www.smartgas-cn.com

150 North Michigan Avenue
60601 Chicago, ILUSA
T +1 (0) 32 585-8319
contact-usa@smartgas.eu
www.smartgas.eu/enPage 1/3

Silarex | CO2 // CO // | SX-200019-00000
General features

Channel 1:

Channel 2:

CO2

CO

FS = 25 Vol.-%

FS = 2000 ppm

Digital resolution:

0.01 Vol.-%

1 ppm

Detection limit (3 σ) fast mode:

0.12 Vol.-% /12 ppm /Detection limit (3 σ) medium mode:

0.08 Vol.-% /6 ppm /Detection limit (3 σ) slow mode:

0.04 Vol.-%

3 ppm

Repeatability:≤ ± 0.1 Vol.-%≤ ± 9 ppm

Measurement principle:

n rangesn boardChannel 3:

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 50 mm (L x W x H)

Warm-up time(start up time):< 2 minutes

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

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

Linearity error (straight line deviation):≤ ± 0.25 Vol.-%≤ ± 10 ppm

Long term stability (zero):over 1000 h operating time

≤ ± 0.25 Vol.-%≤ ± 25 ppm

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

≤ ± 0.06 Vol.-%≤ ± 12 ppm

Influence of T, P, flow rate, other*
Temp. dependence (zero):with thermal isolation, heater on≤ ± 0.01 Vol.-% per °C≤ ± 0.1 ppm per °C

Temp. dependence (span):with thermal isolation, heater on≤ ± 0.02 Vol.-% per °C≤ ± 0.2 ppm per °C

Pressure dependence:pressure compensated, residual error in % ≤ ± 0.02
of actual reading / hPa

to Flow rate dependence:crossCross sensitivity (zero) other gases:
providingfurtherresults. Electrical parameters
sensor Supply voltage:
life Inrush current:≤ ± 0.02≤ ± 0.02 Vol.-%≤ ± 2 ppm

@ 25 Vol.-% CO2 (compensated for 42 °C): @ 2000 ppm CO (compensated for 42 °C): ≤ ± 0.4 Vol.-%< ± 24 ppm

24 V DC + 10 %< 400mA

Average power consumption:< 6 W (while heater on) // < 1 W (at stabilized temperature)

Digital output signal:

Modbus ASCII / RTU via RS485, autobaud, autoframe

Calibration:

zero and span by SW

Climatic conditions
Sensor heating temperature

42°C

Operating temperature:

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

Storage temperature:-20 °C … + 60 °C

Air pressure:800 .. 1150 hPa

Ambient humidity:

0 .. 95 % relative humidity (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.

smartGAS Mikrosensorik GmbHsmartGAS Sensor Technology Co., Ltd

smartGAS US-OfficeHuenderstrasse 174080 Heilbronn
Germany
T +49 (0) 7131 797553-0
sales@smartgas.eu
www.smartgas.eu

Building 16, No. 59 Jiangnan Rd. CEDZ Changshu,Jiangsu
China
T +86 (0) 512-83380880
info@smartgas-cn.com
www.smartgas-cn.com

150 North Michigan Avenue
60601 Chicago, ILUSA
T +1 (0) 32 585-8319
contact-usa@smartgas.eu
www.smartgas.eu/enPage 2/3

Silarex | CO2 // CO // | SX-200019-00000
Technical drawing

All rights reserved. Any logos and/or product names are trademarks of smartGAS. The reproduction, transfer, distribution or storage of
information contained in this brochure in any form without the prior written consent of smartGAS is strictly prohibited. Allspecifications – technical included – are subject to change without notice. Depending on the application, the target gas and themeasurement range the technical data may differ. No liability is accepted for any consequential losses, injury or damage resulting fromthe use of this document or from any omissions or errors herein. The data is given for guidance only. It does not constitute aspecification or an offer for sale. Please consult smartGAS sales engineers for any deviating requirement.

smartGAS Mikrosensorik GmbHsmartGAS Sensor Technology Co., Ltd

smartGAS US-OfficeHuenderstrasse 174080 Heilbronn
Germany
T +49 (0) 7131 797553-0
sales@smartgas.eu
www.smartgas.eu

Building 16, No. 59 Jiangnan Rd. CEDZ Changshu,Jiangsu
China
T +86 (0) 512-83380880
info@smartgas-cn.com
www.smartgas-cn.com

150 North Michigan Avenue
60601 Chicago, ILUSA
T +1 (0) 32 585-8319
contact-usa@smartgas.eu
www.smartgas.eu/enPage 3/3