Gas detection

Gas detection: differences between infrared and catalytic sensor

Gas detection is a crucial aspect of ensuring safety in domestic and industrial environments. Two of the most common technologies used in gas detectors are infrared and catalytic sensors. Each of these technologies has specific advantages. In this article, we will look in detail at the features, pros, and cons of both technologies to help understand which may be the best choice for different applications.

Rilevazione gas

Gas detection: Infrared sensor

Infrared (IR) sensors detect the presence of gas by measuring the absorption of infrared light by gas molecules. An infrared light emitter sends a beam of light through the gas sample, and a detector measures the intensity of the transmitted light. The amount of light absorbed is proportional to the concentration of gas present.

Sensors with infrared technology have several advantages:

  • Accuracy and Reliability: Infrared sensors offer very accurate and reliable detection, with a low probability of false alarms.
  • Long Service Life: These sensors have a long service life, often longer than catalytic sensors, because they are not consumed by the detected gas.
  • No Oxygen Required: IR sensors can operate effectively in oxygen-free environments, making them ideal for indoor or underground applications
  • Low Maintenance: They require little maintenance compared to catalytic sensors, reducing long-term operating costs.

Gas detection: catalytic sensor

Catalytic sensors detect the presence of combustible gases by means of a catalytic reaction. The sensor contains a small heated element covered by a catalyst. When the gas comes into contact with the element, it oxidizes, generating heat. The increase in temperature causes a change in the electrical resistance of the element, which is measured to determine the concentration of the gas.

Catalytic sensors have several advantages:

  • Lower Cost: Catalytic sensors are generally cheaper to manufacture and purchase than infrared sensors.
  • Wide Range of Detectable Gases: They can detect a wide range of combustible gases, including methane, propane and hydrogen.
  • Reliability in Various Conditions: They work well in a variety of environmental conditions and can be used in many industrial applications.

Entrust the calibration and periodic maintenance of your gas detection systems to Sensitron

Our gas detection systems have different maintenance requirements depending on the gases detected and the applications in which they are used. Scheduled maintenance ensures the efficiency of gas detection systems and the resulting safety of workers and environments.

Entrust periodic maintenance to our team means extending the life cycle of instruments with an impact on both running costs and the environment.

Rilevazione gas: manutenzione

Discover our products

Rilevatore gas, industriale, settore farmaceutico, idrogeno Pharmaceutical Hydrogen


Suitable for detecting flammable substances, toxic gases, refrigerants and oxygen in classified areas.
Certified ATEX, IECEx and SIL2/3

Rilevatore gas, industriale, settore farmaceutico, Pharmaceutical industry


Suitable for detecting in classified areas, Certified ATEX, IECEx and SIL2/3, allows non-intrusive field calibration.

MULTISCAN++ S2 centrale rilevazione gas, industriale, Pharmaceutical industry


Designed to meet the widest demand from the market, they allow management of up to 264 detectors. ATEX and SIL certified.

The use of Augmented Reality

Though the use of augmented reality it’s possible to view our gas detectors in detail, open them to see the components and read technical details.

Our detectors in augmented reality are available on Instagram.

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