IRM-AT Methane Sensor
CH4 Gas Sensor, NDIR Thermopile, A-Series, 0 – 2.5% and 0 – 100% vol ranges
Wide-range NDIR methane sensor for leak detection and process monitoring
The IRM-AT is a thermopile-based NDIR methane sensor offering dual capability: a precise 0 – 2.5% range for leak detection and a 0 – 100% vol range for process and high-concentration monitoring. Its patented optical design follows the Beer-Lambert law closely, enabling universal linearisation and minimising the need for custom EEPROM coefficients. IRM-AT is ideal for fixed systems in battery rooms, gas storage, process plants and industrial safety applications where high CH4 concentrations may be present.
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Key Specifications:
|
Sensor Model |
Target Gas |
Technology / Package |
Concentration Range |
Accuracy |
T90 Response Time |
Operating Life |
|
IRM-AT |
Methane (CH4) |
NDIR, thermopile detector, A-Series |
0 – 2.5% vol CH4 (high-accuracy leak range); 0 - 100% vol CH4 (wide-range process) |
<± 500 ppm (0 – 2.5 %); <± 1 % vol (0 – 100 %) |
< 40 s at 20°C |
MTBF > 3 years at 5 V DC |
|
Feature |
Benefit |
|
Dual range (0 – 2.5% and 0 – 100% vol) |
Supports both leak detection and full-scale process monitoring with one sensor. |
|
Patented NDIR optical design with Beer–Lambert behaviour |
Enables universal linearisation and consistent performance across production batches. |
|
Defined linearisation coefficients (b, c) and span |
Simplifies firmware implementation for OEMs developing multi-range CH4 instruments. |
|
Thermopile detector with integrated thermistor |
Supports stable temperature-compensated operation in a wide ambient range. |
|
A-Series footprint |
Aligns mechanically with catalytic LEL (CH-A3) and toxic sensors for common platforms. |
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Technical Datasheet
Application Notes
- NDIR methane measurement, linearisation and process control guidance in Alphasense Gas Safety Product Guide
Design Considerations
- Follow datasheet notes: use recommended socket, avoid mechanical shock, and perform zero + span calibration (e.g. 0 % and 2 % CH4) for the 0 – 2.5% range.
- For applications with explosive atmospheres, mount IRM-AT inside a suitable Ex-approved enclosure (sensor itself is not Ex-approved).
Safety Documents
- Methane safety, Ex integration and NDIR transmitter guidance in Alphasense Gas Safety Product Guide.
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