How to choose a gas detector

Are you researching the dangers of gas leaks and interested in buying a detector? The choice may not be simple given the numerous models on the market. What are the most important factors to consider? What should a good gas detector ensure? Let’s take a look at the main things to consider before making your purchase.

Reliability and precision

A gas detector can be a real life-saving device, able to warn us of any danger in time to prevent the worst of consequences. For this reason, it is essential that the appliance be constructed in accordance with UNI-EN gas safety standards, so as to always ensure that the manufacturer provides suitable certifications for the detector, such as the IMQ quality certificate.

The gas to be detected

Detectors always state the type of gas they are able to detect. The most common domestic gases are methane, LPG and carbon monoxide. Of course, the choice on which to monitor depends on the gas used in your system. However, there are also detectors capable of monitoring two gases simultaneously, such as methane and CO.

Reporting and intervention

The task of the detector is to warn and signal the presence of gases and, obviously, to intervene to stop the release. When choosing the model, be sure that in addition to the presence of the classic alarm for acoustic signalling, there are also visual warnings. These are important for various reasons: they allow to be aware of the alarm even in cases in which it is not possible to hear the siren, as well as signal the correct operation of the device. Indeed, any decent gas detector should have three LED lights – green to signal that the detector is active, yellow to signal any faults and red to signal the alarm and thus the presence of gas. It is therefore important that these devices have such indicators in a prominent and frontal position.

With regard to an interruption to the gas supply, it is imperative that the detector is able to control a solenoid valve connected to the gas system. This allows the leak to be stopped until the cause has been identified and remedied.

Sensitivity to gas

The sensor is the most important part of a gas detector, since the device’s ability to warn us in the event of danger also depends on the quality of the sensor. Better detectors usually have an intervention threshold set at 10% of L.E.L. (Lower Explosive Limit). We will soon dedicate a post looking into the measurement of a gas concentration and the L.E.L. threshold.


One aspect that is not to be underestimated when choosing a detector is the presence of a self-diagnostics system. How do we ensure that the sensor and the appliance are working properly? In this sense, the device’s self-diagnosis acts as a guarantee and a plus in terms of safety.

We have listed what are undoubtedly the most important aspects in choosing a detector, since they directly relate to its effectiveness and reliability. Of course, if you need advice or have any questions or concerns, feel free to contact us and we will be happy to help!