Standards Development

Scope

This part of IEC 62990 specifies general requirements for design, function and performance, and describes the test methods that apply to portable, transportable, and fixed equipment for the detection and concentration measurement of toxic gases and vapours in workplace atmospheres.

NOTE The term gas detection equipment is often referred to as the term gas detector.

This document is applicable to continuously sensing equipment whose primary purpose is to provide an indication, alarm and/or other output function the purpose of which is to indicate the presence of a toxic gas or vapour in the atmosphere and in some cases to initiate automatic or manual protective action(s). It is applicable to equipment in which the sensor generates an electrical signal when gas is present.

This document applies to Type TX-HM (Health Monitoring) 'occupational exposure' equipment:

For occupational exposure measurement, the performance requirements are focused on uncertainty of measurement of gas concentrations in the region of Occupational Exposure Limit Values (OELV). The upper limit of measurement will be defined by the manufacturer in accordance with 4.2.1.

For equipment used for sensing the presence of multiple gases this document applies only to the part for occupational exposure measurement of toxic gas or vapour.

This document is not applicable to equipment:

–        with samplers and concentrators such as sorbents or paper tape having an irreversible indication;

–        used for the measurement of gases and vapours related to the risk of explosion;

–        used for the measurement of ox0ygen;

–        used for medical applications;

–        used only in laboratories for analysis or measurement;

–        used only for process monitoring or control purposes (such as a gas analyser);

–        used in the domestic environment;

–        used in environmental air pollution monitoring;

–        used for flue gas analysis;

–        used for sampling systems external to the gas detection equipment;

–        used for open-path (line of sight) area gas measurement;

–        used for ventilation control in car parks or tunnels.