OCIEngine PRO methane

Miniaturized infrared spectroscopy sensors dedicated to methane measurement

OCIEngine PRO methane CH4 is an infrared spectrometer that measures methane in air.

Methane detection by NDIR involves measuring the absorption of infrared light by the gas. A gas detector exposes the sample to infrared light, filters the wavelength corresponding to methane and then measures the intensity of the light that has passed through the sample. The decrease in intensity is proportional to the concentration of methane, according to the Beer-Lambert law.

Technical specifications

Methane detection

Units of measurement ppm
Measurement range From 0 to 5000 ppm
Measurement accuracy (max error with 60sec integration time)
Conditions: 50% RH, 23°C
20 ppm + 5% of reading
Sampling period 125 ms
Response time 38s (τ=63%)

Sampling characteristics

Air inlet 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 (supply by flow)
Humidity < 100% relative humidity (RH), not condensing

Environnemental conditions

Operating conditions From 0°C to 50°C (temperature compensated)
Storage From -10°C to 70°C
Typical starting time at 23°C
5 minutes (30 minutes at full spec)
Pressure 800 – 1150 mbar

Electrical characteristics

Supply voltage 3,7 VDC min – 5,5 VDC max (others on demand)
Input current 1,5 A max
Communication interface RS232 protocol (others on demande)
x3 Pico-SPOX MOLEX connector (2, 3 and 5 contacts)

Package information

Dimensions 125 x 30 x 22 mm
Weight 20g
Fixing parts2 2 tapped holes for M3 fixing

Sensor architecture

Mechanical drawings


Methane monitoring

Methane is a greenhouse gas that is about 25 times more potent than carbon dioxide in terms of its ability to trap heat, although it does not remain in the atmosphere as long. Methane emissions can come from natural sources such as wetlands, forest fires and termites, as well as from human activities such as agriculture, energy production and waste management.

Monitoring methane in the air can help identify emission sources and track changes over time. These data can inform efforts to reduce methane emissions, such as improving agricultural practices, reducing leakage in natural gas production and distribution systems, and capturing methane from landfills and wastewater treatment plants.

In addition to its contribution to climate change, methane can also pose a safety risk at certain concentrations because it is flammable and explosive. Methane monitoring is therefore important to identify and address potential safety hazards, particularly in confined or enclosed spaces such as mines, oil and gas wells, and industrial plants.

> Discover more about methane monitoring