1 Scope
This part of EN 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 and other industrial and commercial applications.
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 two types of equipment:
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• Type 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.
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• Type SM (Safety Monitoring) ‘general gas detection’ equipment:
For general gas detection applications (e.g. safety warning, leak detection), the
performance requirements are focused on alarm signalling. The upper limit of measurement will be defined by the manufacturer according to the intended use of the equipment.
In general, the requirements for accuracy will be higher for Type HM equipment than
for Type SM equipment. The same equipment may meet the requirements of both Type HM
and Type SM.
For equipment used for sensing the presence of multiple gases this document applies
only to the detection of toxic gas or vapour.
This document is not applicable to equipment:
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— with samplers and concentrators such as sorbents or paper tape having an irreversible
indication;
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— used for the measurement of gases and vapours related to the risk of explosion;
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— used for the measurement of oxygen;
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— used only in laboratories for analysis or measurement;
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— used only for process measurement purposes;
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— used in the domestic environment;
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— used in environmental air pollution monitoring;
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— used for open-path (line of sight) area gas measurement;
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— used for ventilation control in car parks or tunnels.