1 .1 This standard provides minimum requirements for fixed and transportable open path toxic gas detection equipment.
1 .2 This standard specifies the construction, performance and testing of open path (line-of-sight) gas detectors that sense the presence of toxic gas concentrations in air.
1 .3 For equipment used for sensing the presence of multiple gases, this document applies only to the portion sensing the toxic gas. Sensing of combustible gases is outside the scope of this document.
