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
IR2 Single Gas Series Datasheet
Infrared Single 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 the
hazardous environment.
The IR2xxx Series share the same build and performance
standard as the IR1xxx Series, but are labelled as being
intrinsically safe for methane monitoring in mining
applications.
APPLICATION
Mining
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.
FEATURES
For detection of the following gases:
o
Carbon Dioxide (IR21 Series),
o
Hydrocarbons (IR22 series, IR23 series)
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)
16.6mm or 19.0mm sensor heights available
Embedded temperature sensor in some versions for
improved temperature compensation
Shock-resistant IR Source version available on certain
types
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
TECHNICAL SPECIFICATION
Mechanical
Dimensions
Body material
Approximate Weight
See Outlines
Stainless Steel
30g
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-0248, Issue 2, 28-Sep-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
Sensor
Type **
Concentration Range *
Gas
Highest
Lowest
Standard
Rugged
16.6mm
19mm
IR Source
Sensor Height
Internal Temperature
Sensor
Thermistor
LM60
None
Qty
of
Pins
6
IR21BD
IR21EJ
7
IR21EM
Carbon
Dioxide
IR21GJ
0 to 5%
0 to 0.5%
7
7
IR21GM
7
IR21BR
0 to 100%
0 to 10%
7
IR22BD
6
IR22BD_1
6
IR22EJ
Methane /
Hydrocarbons
7
IR22EM
0 to 100%
0 to 100%LEL
7
IR22GJ
7
IR22GM
7
IR23BD
6
*
**
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.
All sensors use temperature compensated pyroelectric detectors except for IR2nBD variants which are uncompensated. This refers to a change in
the DC voltage output only. Further temperature compensation is required for all sensor variants.
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-0248, Issue 2, 28-Sep-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
)
Active (mV):
Reference (mV):
(2)
(1)
IR21BD
IR21xJ,
IR21xM
Carbon Dioxide
IR21BR
IR22BD
IR22xJ,
IR22xM
IR23BD
(5)
Methane / Hydrocarbons
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
9 to 27
15 to 42
(2) (3)
12 to 36
9 to 29
0.10
0.30
15 to 50
6 to 22
0.06
0.12
9 to 43
15 to 42
0.07
0.15
22 to 65
9 to 29
0.07
0.15
20 to 60
15 to 42
0.07
0.15
Sensitivity to Standard Test Gas
Minimum Absorbance:
Maximum Absorbance:
0.25
0.60
(3)
Typical Sensitivity for Gas Range
Minimum Detection Level
(4)
Refer to Fractional Absorbance Curves
2ppm
CO
2
(6)
5ppm
CO
2
0.02%v/v
0.10%v/v
-------
0.20%v/v
-------
-------
50ppm
CO
2
-------
-------
-------
-------
0.20%v/v
3%v/v
50ppm
CH
4
-------
-------
-------
0.15%v/v
-------
5%v/v
30ppm
CH
4
-------
-------
-------
0.15%v/v
-------
5%v/v
30ppm
CH
4
-------
-------
-------
0.15%v/v
-------
5%v/v
Maximum deviation from linearity (±)
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)
(7)
0.01%v/v
0.05%v/v
-------
0.10%v/v
-------
-------
Zero:
0.5%v/v:
2%v/v:
2.5%v/v:
5%v/v:
10%v/v:
100%v/v:
Short Term Stability (±)
Zero:
0.5%v/v:
2%v/v:
2.5%v/v:
5%v/v:
10%v/v:
100%v/v:
(8)
10
25
100
-------
250
-------
-------
:
5 ppm
0.01%v/v
0.05%v/v
-------
0.10%v/v
-------
-------
15
30
125
-------
300
-------
-------
10 ppm
0.01%v/v
0.05%v/v
-------
0.15%v/v
-------
-------
10
-------
-------
-------
-------
500
2500
20 ppm
-------
-------
-------
-------
0.1%v/v
1%v/v
25
-------
-------
-------
200
-------
2000
0.01%v/v
-------
-------
-------
0.08%v/v
-------
2%v/v
25
-------
-------
-------
200
-------
2000
0.01%v/v
-------
-------
-------
0.08%v/v
-------
2%v/v
20
-------
-------
-------
150
-------
1500
0.01%v/v
-------
-------
-------
0.08%v/v
-------
2%v/v
© SGX Sensortech 2016
Document subject to disclaimer on page 1
DS-0248, Issue 2, 28-Sep-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
Humidity Response (+)
Zero:
0.5%v/v:
2%v/v:
2.5%v/v:
5%v/v:
10%v/v:
100%v/v:
Pressure Effects
(10)
(9)
IR21BD
IR21xJ,
IR21xM
IR21BR
IR22BD
IR22xJ,
IR22xM
0.10%v/v
-------
-------
-------
0.25%v/v
-------
2%v/v
IR23BD
Negligible
0.10%v/v
-------
-------
-------
0.25%v/v
-------
2%v/v
0.15%v/v
-------
-------
-------
0.30%v/v
-------
2%v/v
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).
The sensors are cross-sensitive to most hydrocarbons. The sensors have a higher sensitivity to most hydrocarbons compared to methane.
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
IR21BD
IR21EJ
IR21EM
IR21GJ
IR21GM
0 - 5%
Carbon Dioxide
IR21BD
IR21EJ
IR21EM
IR21GJ
IR21GM
0 - 0.5%
Carbon Dioxide
IR21BR
0 - 100%
Carbon Dioxide
IR21BR
0 - 10%
Carbon Dioxide
© SGX Sensortech 2016
Document subject to disclaimer on page 1
DS-0248, Issue 2, 28-Sep-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
IR22BD
IR22BD_1
IR22EJ
IR22EM
IR22GJ
IR22GM
IR23BD
0 - 100%
Methane
IR22BD
IR22BD_1
IR22EJ
IR22EM
IR22GJ
IR22GM
IR23BD
0 - 5%
Methane
Other Target Gases
IR22BD
IR22BD_1
IR22EJ
IR22EM
IR22GJ
IR22GM
IR23BD
0 - 3%
Ethane
IR22BD
IR22BD_1
IR22EJ
IR22EM
IR22GJ
IR22GM
IR23BD
0 - 2.4%
Propane
IR22BD
IR22BD_1
IR22EJ
IR22EM
IR22GJ
IR22GM
IR23BD
0 - 1.8%
Butane
© SGX Sensortech 2016
Document subject to disclaimer on page 1
DS-0248, Issue 2, 28-Sep-2016, Page 5
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