There are many different types of Gas detectors available depending on the detection mechanism. It is recommended that you have a professional carry out a site survey in order to determine the exact type of detector you require.

Electrochemical sensors detect combustible gases by measuring the electrical changes caused by the presence of gases in the atmosphere. These sensors measure the change in resistance of the tin dioxide layer. When a gas comes in contact with the sensor it reduces the layer’s resistance thus changing the reading on the sensor. This is measured by the electrodes and translated into a signal to trigger an alarm.

Understanding Gas Detectors: Types and Uses

This type of gas detector is ideal for flammable gases and oxygen leaks and is used by fire services, oil/gas refineries and power plants. It measures the concentration of a combustible gas at a specific point in an area and is typically reported as a percentage of LEL (Lower Explosive Limit) or ppm (parts-per-million).

A chromate based ionization detector is used to detect poisonous gases by detecting the chemical changes that occur when these chemicals come into contact with the ion sensing film inside the instrument. These instruments can be set up to monitor a specific group of toxic gases and can also be used in combination with other types of detectors.

Open-path IR gas detectors continuously monitor hydrocarbon gas clouds in large open areas up to 120 meters away. They are often used by oil/gas refineries, petrochemical plants and other industrial applications that house extensive outdoor pipelines. These detectors are commonly used to detect hydrocarbon gases such as butane, propane, hexane and natural gas (excluding hydrogen) and can be used in conjunction with other detectors.