SGX Europe Sp. z o.o.
Building 11
Ligocka St. 103,
40-568 Katowice,
Poland
T: +48 (0) 32 438 4778
E: sales.is@sgxsensortech.com
www.sgxsensortech.com
IR15 Dual Gas Series Datasheet
Infrared Dual Gas Sensor for Hazardous Environments
(Portable and Fixed Systems)
The SGX infrared sensors use the proven Non-Dispersive
Infrared (NDIR) principle to detect and monitor the presence
of gases. With an infrared source and specific filtering on the
pyroelectric detectors mounted inside the optical/gas cavity,
individual gases or types of gas can be identified and their
concentrations determined.
These sensors are suitable for reliable monitoring of gas
levels in general safety applications where the sensor size is
restricted and require a flameproof enclosure for hazardous
environments.
The IR15 Series contain two active detector elements for
simultaneous monitoring of Carbon Dioxide and Methane or
Hydrocarbon mixtures in the same size housing as some of
the single gas sensors from the IR1xxx series sensors,
making the sensor more cost effective than two separate
sensors.
OPERATION
To operate, the sensors must be interfaced to a suitable
circuit for power supply, output amplification and signal
processing. Sensor outputs require linearisation and
compensation for ambient temperature variation using
algorithms in the system firmware. This is necessary for
sensors to meet their full performance specification. An
embedded temperature sensor facilitates this compensation
on certain types. Further compensation for pressure changes
can also be made in an algorithm, provided there is a
suitable input from a pressure sensor.
A set of Application Notes is available from the SGX
Sensortech Ltd website, to explain more about NDIR gas
sensing and provide advice for the end-user on interfacing
the sensors and processing signals.
APPLICATIONS
Oil & Gas
Petrochemical
Biogas
Wastewater
Utilities
Steelworks
Confined Space Entry
Indoor Air Quality
FEATURES
For detection of the following gases:
o
Carbon Dioxide & Hydrocarbons,
o
Hydrocarbons Mixtures
Gas concentration ranges:
o
0 - 5% Carbon Dioxide
(also suitable for 0 to 0.5%v/v)
o
o
0 - 100% Carbon Dioxide
(also suitable for 0 to 10%)
0 - 100%v/v Hydrocarbons
(also suitable for 0 to 100%LEL)
TECHNICAL SPECIFICATION
Mechanical
Dimensions
Body material
Approximate Weight
See Outlines
Stainless Steel
35g
19mm sensor height
Embedded thermistor for improved temperature
compensation
Diffused gas sampling via mesh
Low power
Reference channel for self-compensation
Special gold plated optical gas cavity for stable signal
levels
Operational in varying temperature, pressure and
humidity
Fast response
Rugged stainless steel construction
No moving parts
Immunity from ‘poisoning’
Reliable fail-safe operation
Certified: ATEX, IECEx, CSA and UL
Environmental
Ambient temperature range
for operation:
storage:
Operational pressure range
Humidity range for operation
and storage
-20°C to +55°C
-20°C to +55°C
30kPa to 130kPa
0 to 95% RH
(Non-condensing)
Electrical
DC supply to detectors
Typical power
IR Source Supply
(Recommended)
3V to 5V
180mW @ 5V
+5V, 60mA
(Square Wave at 4Hz, 50% duty cycle)
___________________________________________________________________________________________
Whilst SGX has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the con sequences of any use thereof and also
reserves the right to change the specification of goods without notice. SGX accepts no liability beyond the set out in its standard conditions of sale in respect of
infringement of third party patents arising from the use of SGX products in accordance with information contained herein.
In case of modification of the product, SGX disclaims all liability.
SGX Europe sp .z o.o. Poland REGON: 362332227
DS-0249, Issue 1, 13-Oct-2016, Page 1
SGX Europe Sp. Z o.o.
Building 11
Ligocka St. 103,
40-568 Katowice,
Poland
T: +48 (0) 32 438 4778
E: sales.is@sgxsensortech.com
www.sgxsensortech.com
CONFIGURATIONS
Target Gas 1
Sensor
Type
Concentration Range *
Gas
Highest
Lowest
Target Gas 2
Concentration Range *
Gas
Highest
Lowest
Application(s)
IR15TT
0 to 5%
IR15TT-M
Carbon Dioxide
Hydrocarbons
IR15TT-R
0 to 100%
0 to 10%
0 to 100%
0 to 100%LEL
0 to 0.5%
Oil & Gas
Petrochemical
Wastewater
Steelworks
Confined Space Entry
Indoor Air Quality
Biogas
IR15TT-D
Hydrocarbons
0 to 100%
0 to 100%LEL
Utilities
*
The Highest Concentration Range is the highest range the sensor is suitable. The Lowest Concentration Range is the lowest range the sensor is
suitable. The use of the sensor beyond these ranges will affect the sensor’s performance.
IR15TT
The IR15TT can be used in all applications for general monitoring of both relatively low concentrations of carbon dioxide and
simultaneous %LEL and %v/v concentrations of Group II hydrocarbons, including benzene. The sensors contain a broadband
hydrocarbon detector which are cross sensitive to most hydrocarbons and can therefore be calibrated to a specific target gas or
a number of gases that can then be selected in the configuration of the customer’s gas measurement instrument.
IR15TT-M
The IR15TT-M is very similar to the IR15TT except that a narrowband hydrocarbon detector is used. The sensor can still be
used to monitor the same levels of carbon dioxide and hydrocarbons but are unsuitable for the detection of benzene. The
narrowband detector also has a slightly lower response to humidity than the IR15TT, but is generally more cross-sensitive to
other hydrocarbons.
IR15TT-R
The IR15TT-R was designed specifically for Biogas applications for the simultaneous detection of carbon dioxide up to 100%v/v
and %LEL and %v/v concentrations of hydrocarbons, but can be potentially used for other applications. The IR15TT-R contains
the narrowband detector which is unsuitable for the detection of benzene.
IR15TT-D
The IR15TT-D is fitted with both the narrowband and broadband hydrocarbon detectors with differing centre wavelength and
bandwidth to potentially differentiate between hydrocarbons. The sensor was designed for the gas instruments being used by
utilities companies to help differentiate between different compositions of natural gas.
HANDLING PRECAUTIONS
1. Do not allow sensors to fall on the floor. This could cause IR Source filament breakage, damage to the pins and the gas
entrance aperture.
2. Do not apply mechanical force against the gas entrance aperture.
3. Do not immerse sensors in water or other fluids.
4. Protect the gas entrance aperture against dust ingress and sprayed materials.
5. Anti-static handling precautions must be taken.
© SGX Sensortech 2016
Document subject to disclaimer on page 1
DS-0249, Issue 1, 13-Oct-2016, Page 2
SGX Europe Sp. Z o.o.
Building 11
Ligocka St. 103,
40-568 Katowice,
Poland
T: +48 (0) 32 438 4778
E: sales.is@sgxsensortech.com
www.sgxsensortech.com
PERFORMANCE
For test purposes, all data taken using the following conditions:
- Performance as tested in the SGX IR-EK2 Evaluation Kit directly after calibration.
- SGX linearisation and temperature compensation algorithms applied; see Infrared Sensor Application Notes.
- IR Source Voltage 5V, square wave, at 4 Hz and 50% duty cycle. Running the IR Source at 3V will decrease performance due
to lower output signals.
- Ambient temperature (20°C) and pressure (101 kPa).
- All gases diluted in dry nitrogen.
- Performance for the Hydrocarbons refers to Methane only. Most other hydrocarbons will have an improved performance.
- Performance data is the same for the supported IR Source variants (“_1” variants).
- Refer to Application Notes for more information.
Sensor type
Gas
Concentration Range
Warm-up Times
Maximum Response Time (T
90
)
Peak-to-Peak Outputs (in N
2
)
(2)
Active (mV):
Reference (mV):
Sensitivity to Standard Test Gas
(2) (3)
Minimum Absorbance:
Maximum Absorbance:
Typical Sensitivity for Gas Range
(3)
Minimum Detection Level
(4)
(1)
IR15TT
CO
2
Methane
/
Hydrocarbons
(5)
IR15TT-M
CO
2
Methane
/
Hydrocarbons
(5)
IR15TT-R
CO
2
Methane
/
Hydrocarbons
(5)
IR15TT-D
Methane
/
Hydrocarbons
(5)
Methane
/
Hydrocarbons
(5)
Refer to Configurations Table
<20 sec to operate
<60 sec for Zero ±1% of Full Scale,
<30 min to full specification at 20
C
20 sec
10 to 29
24 to 58
18 to 43
10 to 29
12 to 47
18 to 45
8 to 21
12 to 47
24 to 58
18 to 43
10 to 24
18 to 43
0.25
0.50
0.07
0.15
0.25
0.50
0.07
0.15
0.07
0.12
0.06
0.10
0.07
0.15
0.07
0.15
Refer to Fractional Absorbance Curves
2ppm
CO
2
30ppm
CH
4
2ppm
CO
2
30ppm
CH
4
50ppm
CO
2
60ppm
CH
4
30ppm
CH
4
30ppm
CH
4
Maximum deviation from linearity (±)
(6)
0 to 0.5%v/v Range:
0 to 2%v/v Range:
0 to 2.5%v/v Range:
0 to 5%v/v Range:
0 to 10%v/v Range:
0 to 100%v/v Range:
0.01%v/v
0.05%v/v
-------
0.10%v/v
-------
-------
-------
-------
-------
0.15%v/v
-------
5%v/v
0.01%v/v
0.05%v/v
-------
0.10%v/v
-------
-------
-------
-------
-------
0.15%v/v
-------
5%v/v
-------
-------
-------
-------
0.20%v/v
2%v/v
-------
-------
-------
0.15%v/v
-------
5%v/v
-------
-------
-------
0.15%v/v
-------
5%v/v
-------
-------
-------
0.15%v/v
-------
5%v/v
Temperature Variation (± ppm /
C)
(7)
Zero and Concentration Range Maximum
(-20C to +55C)
Zero:
0.5%v/v:
2%v/v:
2.5%v/v:
5%v/v:
10%v/v:
100%v/v:
10
25
100
-------
250
-------
-------
20
-------
-------
-------
150
-------
1500
10
25
100
-------
250
-------
-------
25
-------
-------
-------
200
-------
2000
10
-------
-------
-------
-------
500
2500
50
-------
-------
-------
250
-------
2500
25
-------
-------
150
-------
-------
2000
20
-------
-------
-------
150
-------
1500
Short Term Stability (±)
(8)
:
Zero:
0.5%v/v:
2%v/v:
2.5%v/v:
5%v/v:
10%v/v:
100%v/v:
5 ppm
0.01%v/v
0.05%v/v
-------
0.10%v/v
-------
-------
0.01%v/v
-------
-------
-------
0.10%v/v
-------
2%v/v
5 ppm
0.01%v/v
0.05%v/v
-------
0.10%v/v
-------
-------
0.01%v/v
-------
-------
-------
0.08%v/v
-------
2%v/v
20 ppm
-------
-------
-------
-------
0.1%v/v
1%v/v
0.01%v/v
-------
-------
-------
0.10%v/v
-------
3%v/v
0.01%v/v
-------
-------
-------
0.10%v/v
-------
2%v/v
0.01%v/v
-------
-------
-------
0.10%v/v
-------
2%v/v
© SGX Sensortech 2016
Document subject to disclaimer on page 1
DS-0249, Issue 1, 13-Oct-2016, Page 3
SGX Europe Sp. Z o.o.
Building 11
Ligocka St. 103,
40-568 Katowice,
Poland
T: +48 (0) 32 438 4778
E: sales.is@sgxsensortech.com
www.sgxsensortech.com
Sensor type
Gas
CO
2
IR15TT
Methane
/
Hydrocarbons
(5)
IR15TT-M
CO
2
Methane
/
Hydrocarbons
(5)
IR15TT-R
CO
2
Methane
/
Hydrocarbons
(5)
IR15TT-D
Methane
/
Hydrocarbons
(5)
Methane
/
Hydrocarbons
(5)
Humidity Response (+)
Zero:
0.5%v/v:
2%v/v:
2.5%v/v:
5%v/v:
10%v/v:
100%v/v:
(9)
Negligible
0.15%v/v
-------
-------
-------
0.30%v/v
-------
2%v/v
Negligible
0.10%v/v
-------
-------
-------
0.25%v/v
-------
2%v/v
Negligible
0.10%v/v
-------
-------
-------
0.25%v/v
-------
2%v/v
0.10%v/v
-------
-------
-------
0.25%v/v
-------
2%v/v
0.15%v/v
-------
-------
-------
0.30%v/v
-------
2%v/v
Pressure Effects
(10)
Sensors shall meet specification within a ±5% change in ambient pressure from the ambient pressure during
calibration
>10 years for 5 V operation, >20 years for 3 V operation
Conforms to EN 60079-29-1
Requires extra protection depending on application
MTBF (IR Source only)
Vibration
Ingress Protection
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
Based upon an immediate step change in concentration at the aperature of the sensor.
Production Test Limits, using standard test gases of Dry Nitrogen, 2%v/v Carbon Dioxide and 5%v/v Methane, where appropriate.
A
0.30 absorbance is equivalent to a 30% decrease in the Active peak-to-peak output.
The minimum detection level is the smallest detectable change in concentration based upon a 2 sigma variantion. The best detectable change
occurs at 0% gas concentration due to the non-linear output of the detector (see Fractional Absorbance Curves).
Performance for most hydrocarbons will be better than for methane for equiavlent concentrations, as methane is one of the lower sensitive gases
compared to other hydocarbons.
After linearisation using the recommended method of linearisation and based upon a calibration gas with a concentration >75% of the full-scale.
Using average Alpha and Beta coefficients based upon test data from the instrument in which the sensor is being tested. Refer to Application
Notes for information on calculating Alpha and Beta coefficients. Accuracy can be improved by measuring each sensor over temperature to define
specific Alpha or Alpha & Beta coefficients.
After sensor stabilisation and over a period of 8 hours.
Difference in response when changed from 0 %RH to 90 %RH.
Sensors can be used over a greater ambient pressure using pressure compensation of the concentration. An external pressure sensor will be
requred for this.
FRACTIONAL ABSORBANCE CURVES
These show the typical sensitivity versus concentration before linearisation for the range of gases. For further explanation, refer
to the Infrared Sensor Application Notes.
Primary Target Gases
IR15TT
IR15TT-M
0 - 5%
Carbon Dioxide
IR15TT
IR15TT-M
0 – 0.5%
Carbon Dioxide
© SGX Sensortech 2016
Document subject to disclaimer on page 1
DS-0249, Issue 1, 13-Oct-2016, Page 4
SGX Europe Sp. Z o.o.
Building 11
Ligocka St. 103,
40-568 Katowice,
Poland
T: +48 (0) 32 438 4778
E: sales.is@sgxsensortech.com
www.sgxsensortech.com
IR15TT-R
0 - 100%
Carbon Dioxide
IR15TT-R
0 - 10%
Carbon Dioxide
IR15TT
IR15TT-M
IR15TT-R
0 - 100%
Methane
IR15TT
IR15TT-M
IR15TT-R
0 - 5%
Methane
Note: Both IR15TT-D channels have a similar response to methane but different responses to other alkanes (see table below).
Relative Absorbance of Narrowband and Broadband Detectors to Alkanes
Methane 5%v/v
Narrowband
IR15TT-D / IR15TT-M
Ethane (0.5%v/v)
0.87
0.62
Propane (0.35%v/v)
0.82
0.52
1.00
1.00
Broadband
IR15TT-D / IR15TT
CERTIFICATIONS
CSA
The Canadian Standards Association has issued a component certification for the
IR1xxxx Series as an Explosion Proof Enclosure for use in Class I hazardous locations.
It has satisfied the requirements of CSA standard C22.2 No. 30-M 1986. Certificate No.
2589677.
Underwriters Laboratories Inc. recognises the IR1xxxx Series as a component for use in
intrinsically safe apparatus in Class 1, Division 1, Groups A, B, C and D hazardous
locations. It has satisfied the requirements of UL 913, 7th edition. File E186043.
EC Type-Examination
Certificate Numbers:
ATEX:
Sira 99ATEX1121U
IECEx:
IECEx SIR 04.0031U
Sira Test & Certification Service
Rake Lane
Eccleston
Chester, CH4 9JN, UK
EN 60079-0:2012 & IEC 60079-0:2011 (Ed. 6)
Electrical apparatus for explosive gas atmospheres –
General requirements
IEC 60079-1:2014 (Ed. 7)
Electrical apparatus for explosive gas atmospheres
Flameproof enclosures “d”
ATEX:
II 2G Ex db IIC Gb
Ta -20˚C to +55˚C,
IECEx:
Pi: 2.5 W
Ex db IIC Gb
UL
ATEX
Issued by:
IECEX
Have been assessed to
the following harmonized
standards:
Product Marking:
© SGX Sensortech 2016
Document subject to disclaimer on page 1
DS-0249, Issue 1, 13-Oct-2016, Page 5
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