STANDARD FOR GAS AND VAPOUR DETECTORS AND SENSORS, INCLUDING ACCESSORIES

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Standards Development Organisation:
ULC Standards
Contact Information:
ULC Standards Normes ULC
Working Program:
View the ULC work program
Designation Number:
CAN/ULC S588
Standard Type:
National Standard of Canada - Domestic
Standard Development Activity:
Amendment Revision
ICS code(s):
13.320
91.120
Status:
Proceeding to development
SDO Comment Period Start Date:
SDO Comment Period End Date:
Posted On:

Scope:

1.1  This Standard covers requirements for permanently installed, portable and transportable toxic and combustible gas and vapour detectors and sensors, including accessories, intended to be employed in indoor locations or outdoor locations/unconditioned locations in accordance with manufacturer’s recommendations.

1.2  A detector and/or sensor, as covered by these requirements, consists of an assembly of electrical components coupled with a sensing means inside a chamber, or by separate components to detect toxic and/or combustible gases or vapours. The detector includes provision for the connection to a source of power and signaling circuits and optional remote control circuits. Additional functionality, such as a heat detector, heat sensor, smoke detector, smoke sensor, or audible signaling appliance/device, is permitted to be incorporated as part of the toxic combustible gas and vapour detector assembly and are to be evaluated to the applicable standard(s).

Project need:

In UL 2075, Standard for Safety for Gas and Vapor Detectors and Sensors, Clause 34.6 States the following: “All values for temperature rises apply to equipment intended for use with ambient temperatures normally prevailing in occupiable spaces which usually are not higher than 25°C (77°F). When equipment is intended specifically for use with a prevailing ambient temperature constantly more than 25°C (77°F), the test of the equipment is made with the higher ambient temperature, and the allowable temperature rises specified in Table 34.1 are to be reduced by the amount of the difference between the higher ambient temperature and 25°C (77°F). A temperature is considered to be constant when three successive readings taken at intervals of 10 percent of the previously elapsed duration of the test, but not less than 5 minute intervals, indicate no change.” When applying this requirement for products intended to be installed in a prevailing temperature that exceeds 49C, the component temperature must operate at a temperature less than the prevailing ambient temperature which is not plausible. Therefore, the proposed revisions provide an alternate metric that can be applied to referenced components that do not comply with the requirements outlined in 34.6. These revisions align this test with Section 68 - Component Temperature Test requirements as specified in ANSI/UL 864, Control Units and Accessories for Fire Alarm Systems, 10th Edition.

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