Cambridge Sensotec has designed the Rapidox SF6 6100 Pump Back gas analyser, in order to detect levels of sulphur hexafluoride (SF6) in electrical equipment.

SF6 is predominantly used as an arc and cooling medium in medium and high voltage electrical equipment as an electrical insulator. When partial arcing or failure occurs within electrical equipment, it can create decomposition products such as sulphur dioxide and hydrogen fluoride.

The device draws a sample of SF6 from electrical equipment and analyses it in accordance with the relevant test configurations. It can then pump the gas back into the electrical equipment, which is stored internally for proper disposal at a later date.

Early identification of this gas helps minimise the need for maintenance and eliminate power failures, as well as ensuring that equipment and personnel are properly protected.

Under the Kyoto Protocol, SF6 has been classified as a greenhouse gas and restrictions are in place to limit the amount allowed to be released into the atmosphere.

Initially specialising in oxygen (O2) analysis, Cambridge Sensotec has since diversified and extended its product range into other gas analysis markets, including SF6 gas monitoring.


UK-based Cambridge Sensotec specialises in the design and manufacture of gas analysis equipment under the Rapidox brand name. The company has established a worldwide distribution network and ISO 9001 accreditation.