Gas Analyzer

gas pellistors

Catalytic gas sensors

Pellistor gas sensors (or catalytic bead gas sensors) is based on a Wheatstone bridge circuit, and includes two “beads”, both of which encase platinum coils. One of the beads (the ‘active’ bead) is treated with a catalyst, which lowers the temperature at which the gas around it ignites. This bead becomes hot from the combustion, resulting in a temperature difference between this active and the other ‘reference’ bead. This causes a difference in resistance, which is measured; the amount of gas present is directly proportional to it, so gas concentration as a percentage of its lower explosive limit (%LEL) can be accurately determined.

Pellistor Sensor type option

Sensor Type


Main characteristics

LEL Methane

Maximun [ppm]

LEL %100

Resp. Time [s]


The innovative design of the pellistor range provides high quality, low power and excellent poison resistance. All pellistors are housed in certified flameproof chambers.

Aditional Information

Where are they used?

Pellistor gas sensors first made an appearance in the 1960s thanks to British scientist and inventor, Alan Baker. The concept was put forward as a solution to the long-running flame safety lamp and canary techniques. The sensors are highly reliable and are capable of detecting almost 100% of combustible gases that fall within their explosive range. Today, pellistor gas sensors are still used as an effective way to detect combustible gases in a range of potentially explosive environments. These include industrial applications such as mines, oil refineries and oil rigs

Note: Due Sensors are factory calibrated and cetification is 24 months valid once the calibration process is performed, we don't have a stock, we can sell you any sensor only as required.