Alcance
This part of ISO/IEC 62990 specifies general requirements for design, function andperformance, and describes the test methods that apply to portable, transportable, and fixedequipment for the detection and concentration measurement of toxic gases and vapours inworkplace atmospheres and other industrial and commercial applications.This document is applicable to continuously sensing equipment whose primary purpose is toprovide an indication, alarm and/or other output function the purpose of which is to indicatethe presence of a toxic gas or vapour in the atmosphere and in some cases to initiateautomatic or manual protective action(s). It is applicable to equipment in which the sensorgenerates an electrical signal when gas is present.This document applies to two types of equipment:• Type HM (Health Monitoring) ‘occupational exposure’ equipment:For occupational exposure measurement, the performance requirements are focused onuncertainty of measurement of gas concentrations in the region of Occupational ExposureLimit Values (OELV). The upper limit of measurement will be defined by the manufacturerin accordance with 4.2.1.• Type SM (Safety Monitoring) ‘general gas detection’ equipment:For general gas detection applications (e.g. safety warning, leak detection), theperformance requirements are focused on alarm signalling. The upper limit ofmeasurement will be defined by the manufacturer according to the intended use of theequipment.In general, the requirements for accuracy will be higher for Type HM equipment than for TypeSM equipment. The same equipment may meet the requirements of both Type HM and TypeSM.For equipment used for sensing the presence of multiple gases this document applies only tothe detection of toxic gas or vapour.This document is not applicable to equipment:– with samplers and concentrators such as sorbents or paper tape having an irreversibleindication;– used for the measurement of gases and vapours related to the risk of explosion;– used for the measurement of oxygen;– used only in laboratories for analysis or measurement;– used only for process measurement purposes;– used in the domestic environment;– used in environmental air pollution monitoring;– used for open-path (line of sight) area gas measurement;– used for ventilation control in car parks or tunnels.