Explosive atmospheres - Gas detectors. Performance requirements of open path detectors for flammable gases Ingestion-build-111333 BS 3F 70:1991 supersedes BS

BS 3F 70:1991 supersedes BS 2F 70:1983 which is withdrawn

NOTE 8 Future technological development of reactors may necessitate a need to increase the upper limit of the frequencies

With compliance and obedience to BS EN 17111

Figure 1 – Product lifecycle

The standard does not cover individual items of electrical equipment except with regard to their selection for specific aspects of use

Explosive atmospheres - Gas detectors. Performance requirements of open path detectors for flammable gases Ingestion-build-111333 BS 3F 70:1991 supersedes BS1 Scope This part of EN 6007929 specifies performance requirements of equipment for the detection and measuring of flammable gases or vapours in ambient air by measuring the spectral absorption by the gases or vapours over extended optical paths, ranging typically from one metre to a few kilometres. Such equipment measures the integral concentration of the absorbing gas over the optical path in units such as LFL metre for flammable gases. NOTE 1