Fire Safety Science Digital Archive

A method of testing portable flammable gas detectors at elevated temperatures is described and results are given for tests on five proprietary instruments with n-hexane, 'Avtag', and 'Civgas' vapours at 65C, and n-hexane vapour at 25 C. In general, the detectors gave a low response to 'Avtag' and 'Civgas' vapours and there is evidence that the readings are changed significantly with increase of ambient temperature. Possible reasons for the low response are given.