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Pellistor gas sensing heads respond to 95% of all flammable gases and vapours, making it suited to the most diverse range of flammable materials.

It is recommended for sites where many different materials are used such as the paints, coatings, pharmaceuticals and chemical industries.

The pellistor head is susceptible to silicon poisoning, which is where the head is coated in silicon and ceases to function correctly. If silicones may be present in the atmosphere we recommend the use of Infrared, which is the latest in gas sensing technology and cannot be contaminated by silicones.

Our Equipment

We utilise pellistor gas sensing technology in our system6000 and Gascheka Duo solutions.

How do Pellistor gas sensing heads work?

The pellistor head consists of a fine coil of platinum wire embedded in a ceramic bead which is coated with a catalyst. The bead is heated by passing a current through the platinum wire.

Any flammable material present oxidises the bead, adding heat. Any further increase in temperature of the bead will increase the resistance of the wire. The concentration of flammable material is derived from any increase in the resistance of the wire.

The pellistor head is a good explosiometer because its response is directly related to the flammability of the atmosphere. However if there are silicones present the bead becomes coated, the catalytic sites become deactivated and output can become inhibited over a period of time. The start-up calibration gas tests for system6000 and Gascheka Duo ensure that this does not go undetected.