• Infrared Methane Sensor (CH4 Sensor) Thermopile Detector
  • Infrared Methane Sensor (CH4 Sensor) Thermopile Detector
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Infrared Methane Sensor (CH4 Sensor) Thermopile Detector

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  • Price

    Price on request   ≥1piece

  • Model Number

    IRM-AT

  • Data Sheet

  • Package

    Original packaging

  • Specs

    IRM-AT

  • Quantity

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Product Description

IRM-AT Infrared Methane Sensor (CH4 Sensor) Thermopile Detector Description
Alphasense CO2 and Methane infrared sensors are supplied in the industry standard miniature (20mm diameter) gas sensor housing.

Patented optics give the best signal to noise ratio of any 20mm diameter NDIR and universal linearisation constants allow easy implementation.

The on-board temperature sensor allows for software compensation, including ideal gas law correction.

Methane/ Hydrocarbons
The IRM-AT uses a dual thermopile detector for measuring Methane and other Hydrocarbons in non-explosive environments. The plastic housing limits use to non-Ex environments up to 2.5% Methane.


IRM-AT Infrared Methane Sensor (CH4 Sensor) Thermopile Detector PERFORMANCE
Maximum Power Requirements 
 5.0 VDC, 60 mA max. (50% duty cycle source drive)
Minimum Operating Voltage
 2.0 VDC, 20 mA max. (50% duty cycle source drive)
Source Drive Frequency
 3 Hz typical, 50% duty cycle
Active/Reference Output in Air (peak-to-peak)
 2 to 4 mV @ 3 Hz, 50% duty cycle
Typical active signal change for 2.5% CH4
 5% drop (typical) @ 5 V, 3 Hz, 50% duty cycle
Typical active signal change for 100% CH4
 30% drop (typical) @ 5 V, 3 Hz, 50% duty cycle
Response Time (t90)
 < 40s @ 20°C ambient
Warm-up Time
 30 minutes @ 20°C, 5 VDC


IRM-AT Infrared Methane Sensor (CH4 Sensor) Thermopile Detector LIFETIME
MTBF @ 5 VDC
 > 3 years


IRM-AT Infrared Methane Sensor (CH4 Sensor) Thermopile Detector KEY SPECIFICATIONS
Temperature Signal
 Integral thermistor (NTC, R 25 = 100KΩ, ß= 3940 K)
Operating Temperature Range
 -20°C to +50°C (linear compensation from 0 to 40℃)
Storage Temperature Range
 -40°C to +75°C
Humidity Range
 0 to 95% RH non-condensing


Range 
 0 - 2.5%
 0 - 100%
Accuracy
 < ± 500 ppm
 < ± 1% vol
Resolution at zero
 < 200 ppm
 < 300 ppm
Resolution at range 
 < 400 ppm
 < 2.5% vol
Zero repeatability 
 < ± 500 ppm
 < ± 1,000 ppm
FS repeatability
 < ± 0.1% vol
 < ± 2% vol
Limit of detection         
 < 500 ppm
 < 1,000 ppm   
Span coefficient
 0.074 - 0.094  
 1.1 - 1.3 @ 95%
Linearisation coefficient b
 0.38 
 0.025
Linearisation coefficient c
 0.98 
 0.553