OCIEngine PRO methane

Miniaturized infrared spectroscopy sensors dedicated to methane gas measurement.

What is it?

OCIEngine is an infrared spectrometer that measures Volatile Organic Compounds (VOC) in the air. It is specific to analyse a molecule of interest, such as methane.


The measuring chamber of the sensor is crossed by infrared radiation. When the air is introduced into this chamber, the molecules of interest absorb a part of the radiation, which reduces the intensity of the optical signal. The concentration of the gas can therefore be deduced according to the Beer-Lambert’s physical law.

NDIR Methane Sensor

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Technical specifications

Unit of measurement ppm
Measurement range From 0 to 5000 ppm
Measurement accuracy (max error with 60sec integration time) Conditions: 50% RH, 23° 20 ppm + 5% of reading
Sampling period 125ms
Response time 38s (τ=63%)
Pressure range Minimal relative pressure at measuring cell inlet port: 0.3 millibars Maximal relative pressure at measuring cell inlet port: 10 millibars
Flow rate range From 0,1 to 1,5 L/min
Humidity < 100% relative humididy (RH), not condensing
Supply voltage 3,7 VDC min – 5,5 VDC max
Input current 1,5 A max
Communication interface RS232 protocol (others on demand) x3 Pico-SPOX MOLEX connector (2, 3 and 5 contacts)
Discover our evaluation kit to help you pre-integrate and test the sensor in your systems
Operating conditions From 0°C to 50°C
Storage From -20°C to  70°C
Pressure 800 – 1150 mbar
Typical starting time at 23°C 1 minutes (30 minutes at full spec)
Dimensions 125 x 30 x 22 mm
Weight ~20g
Fixing parts 2 tapped holes for M3 fixing

Sensor architecture

Mechanical drawing

Other related


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