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
IR25 Dual Gas Series Datasheet
Infrared Dual Gas Sensor for Mining
(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 mining applications where the sensor size is
restricted and require a flameproof enclosure for hazardous
environments.
The IR25 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 IR2xxx series sensors,
making the sensor more cost effective than two separate
sensors.
The IR25xx Series share the same build and performance
standard as the IR15xx Series, but are labelled as being
intrinsically safe for methane monitoring in mining
applications.
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
Mining
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
Environmental
Ambient temperature range
for operation:
storage:
Operational pressure range
Humidity range for operation
and storage
-20°C to +60°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-0250, 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
IR25TT
Carbon Dioxide
IR25TT-M
0 to 5%
0 to 0.5%
Hydrocarbons
0 to 100%
0 to 100%LEL
Mining
*
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.
IR25TT
The IR25TT can be used for Mining applications to monitor of both relatively low concentrations of carbon dioxide and
simultaneous %LEL and %v/v concentrations of methane. The sensor contains a broadband hydrocarbon detector which is less
cross sensitive to other hydrocarbons but does have a slightly higher response to humidity, when compared with the IR15TT-M.
IR25TT-M
The IR25TT-M is very similar to the IR25TT except that a narrowband hydrocarbon detector is used. The narrowband detector
has a slightly lower response to humidity than the IR25TT, but is generally more cross-sensitive to other hydrocarbons.
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.
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
)
(1)
Peak-to-Peak Outputs (in N
2
)
(2)
Active (mV):
Reference (mV):
CO
2
IR25TT
Methane
(5)
IR25TT-M
/ Hydrocarbons
CO
2
Methane
(5)
/ Hydrocarbons
Refer to Configurations Table
<20 sec to operate
<60 sec for Zero ±1% of Full Scale,
20 sec
10 to 29
18 to 43
24 to 58
10 to 29
18 to 43
12 to 47
© SGX Sensortech 2016
Document subject to disclaimer on page 1
DS-0250, 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
Sensor type
Gas
Sensitivity to Standard Test Gas
(2) (3)
Minimum Absorbance:
Maximum Absorbance:
Typical Sensitivity for Gas Range
Minimum Detection Level
(4)
(3)
IR25TT
CO
2
Methane
(5)
IR25TT-M
/ Hydrocarbons
CO
2
Methane
(5)
/ Hydrocarbons
0.25
0.50
0.07
0.15
0.25
0.50
0.07
0.15
Refer to Fractional Absorbance Curves
2ppm
CO
2
0.01%v/v
0.05%v/v
-------
0.10%v/v
-------
-------
30ppm
CH
4
-------
-------
-------
0.15%v/v
-------
5%v/v
2ppm
CO
2
0.01%v/v
0.05%v/v
-------
0.10%v/v
-------
-------
30ppm
CH
4
-------
-------
-------
0.15%v/v
-------
5%v/v
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:
Temperature Variation (± ppm /
C)
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:
(7)
10
25
100
-------
250
-------
-------
20
-------
-------
-------
150
-------
1500
10
25
100
-------
250
-------
-------
25
-------
-------
-------
200
-------
2000
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:
Humidity Response (+)
(9)
Zero:
0.5%v/v:
2%v/v:
2.5%v/v:
5%v/v:
10%v/v:
100%v/v:
Pressure Effects
(10)
MTBF (IR Source only)
Vibration
Ingress Protection
(1)
(2)
(3)
(4)
(5)
(6)
(7)
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
0.15%v/v
-------
-------
-------
0.30%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
0.10%v/v
-------
-------
-------
0.25%v/v
-------
2%v/v
Negligible
Negligible
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
(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.
© SGX Sensortech 2016
Document subject to disclaimer on page 1
DS-0250, 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
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
IR25TT
IR25TT-M
0 - 5%
Carbon Dioxide
IR25TT
IR25TT-M
0 – 0.5%
Carbon Dioxide
IR25TT
IR25TT-M
0 - 100%
Methane
IR25TT
IR25TT-M
0 - 5%
Methane
Relative Absorbance of Narrowband and Broadband Detectors to Alkanes
Methane 5%v/v
Narrowband
IR25TT-M
Ethane (0.5%v/v)
0.87
0.62
Propane (0.35%v/v)
0.82
0.52
1.00
1.00
Broadband
IR25TT
CERTIFICATIONS
Certificate Numbers:
ATEX:
Sira 02ATEX2015U
IECEx:
IECEx SIR 03.0003U
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
EN 60079-11:2012 & IEC 60079-11:2011 (Ed. 6)
Explosive atmospheres. Equipment protection by intrinsic
safety "i"
ATEX:
I M1 Ex ia I Ma
Ta -20˚C to +60˚C
IECEx:
Ex ia I Ma
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-0250, 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
INSTRUCTIONS SPECIFIC TO HAZARDOUS AREA INSTALLATIONS
(Ref: EU ATEX Directive 2014/34/EU)
1. The IR25xx Series Gas Sensing Heads are component-approved only and may not be used as stand-alone items in a
hazardous area without further protection.
2. The IR25xx Series Gas Sensing Heads shall be protected in service. The Sensing Head shall be mounted in a protective
enclosure such that an impact of 7 J in accordance with IEC 60079-0:2007 clause 26.4.2 from any direction shall not cause
the impact head to make contact with the Sensing Head.
3. The thermal resistance the IR25xx Series Gas Sensing Head does not exceed 25 K/W; this shall be taken into account when
considering its surface temperature and the temperature classification of the equipment into which it is to be incorporated.
4. The IR25xx Series Gas Sensing Heads have not been assessed as a safety device (EHSR 1.5).
5. There are no user-serviceable parts in the component.
6. The end-user/installer shall be aware that the certification of the IR25xx Series Gas Sensing Heads relies on the following
materials used in its construction, which are suitable for most common applications:
Enclosure .................................. Stainless steel
Mesh ......................................... Stainless steel
Bushing ..................................... Epoxy resin
In accordance with the Note in EN60079-0:2006 clause 6.1, the end-user/installer shall inform the manufacturer of any
adverse conditions that the IR25xx Series Gas Sensing Heads may encounter. This is to ensure that the IR25xx Series Gas
Sensing Heads are not subjected to conditions that may cause degradation of these materials.
7. The IR25xx Series Gas Sensing Head is only certified for use in ambient temperatures between
20°C
and +60C and
should not be used outside this range.
8. The IR25xx Series products shall be installed/used in accordance with the following restrictions:
Lamp Circuit
Detector Circuit
Lamp + Detector Circuit
Detector Circuit
Ui = 7.2 V
Ui = 10 V
Pi = 2.71 W
Pi = 1.2 W
9. The IR25xx Series Gas Sensing Heads are dust-proof (IP5x) but offers no protection against the ingress of water. Where
protection in excess of IP50 is required, the apparatus into which the IR25xx Series Head is installed shall provide the
necessary ingress protection (for example by fitting an external semi-permeable membrane).
OUTLINE
(All dimensions in millimetres; dimensions without limits are nominal)
Connections
Pin
1
2
3
4
5
6
7
8
Connection
IR Source
Reference Detector Output
IR Source Return
Active 1 Detector Output (CO2)
+V DC Input
Active 2 Detector Output (Hydrocarbon)
Thermistor
0V (connect Internally to Sensor Body)
Outline Notes
1. Body dimensional tolerances
0.1
dimensional tolerances as indicated.
mm.
Pin
2. IR25xx Series sensors are designed to press-fit into
PCB sockets. The end-user should choose a socket
to accommodate the full sensor pin length. This will
ensure a stable mechanical location as well as good
electrical contact. SGX Sensortech Ltd recommend
the Wearns Cambion type 450-1813-01-03-00
single-pole solder mount socket with through hole,
or a suitable equivalent.
© SGX Sensortech 2016
Document subject to disclaimer on page 1
DS-0250, Issue 1, 13-Oct-2016, Page 5
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