ISO 12133:2021 Small craft — Carbon monoxide (CO) detection systems and alarms

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INTERNATIONAL STANDARD ISO 12133:2021(E)

Small craft — Carbon monoxide (CO) detection systems and alarms

1 Scope

This document specifies requirements for the design, construction and installation of carbon monoxide detection and alarm systems in small craft.

Annex A provides essential educational material about carbon monoxide relative to small craft, and recreational boating recommendations.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 13297:2020, Small craft — Electrical systems — Alternating and direct current installations

IEC 60529:2013/Corr1: 2019, Degrees of protection provided by enclosures (IP Code)

3 Terms a nd definiti ons

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www. iso .org/ obp

— IEC Electropedia: available at http://w ww .electropedia .org/ 3.1

carbon monoxide

CO

gas formed by the combination of one atom of carbon and one atom of oxygen

Note 1 to entry: In its chemical formula, C stands for carbon and O for oxygen. For the purposes of this document, the CO level is always expressed in terms of mass fraction of CO in air.

3.2

carboxyhaemoglobin

COHb

compound formed when carbon monoxide (3.1) combines with haemoglobin

3.3

% COHb

degree to which the oxygen carrying capacity of blood is impeded by the union of carbon monoxide (3.1) to the haemoglobin in blood, expressed as a percentage

3.4

enclosed accommodation compartment

contiguous space, surrounded by permanent structure, that contains all of the following:

a) designated sleeping accommodations,

ISO 12133:2021(E)

b) a galley area with sink, and

c) a head compartment

Note 1 to entry: A cuddy intended for gear storage and open passenger cockpits, with or without canvas enclosures, are not considered to be enclosed accommodation compartments.

3.5

craft

small craft

recreational boat, and other watercraft using similar equipment, of up to 24 m length of hull (L )

H

[SOURCE: ISO 8666:2020, 3.15]

4 Symbols

β (beta) arbitrary variable name chosen to represent the mathematical calculation of the absolute worst case of predicted % COHb levels in a typical individual exposed to the factors [mass fraction (mg/kg) of carbon monoxide level and minutes of exposure to that CO level] used in that calculation.

5 Requirements

5.1 Design and construction

5.1.1 Detectors shall meet the requirements of relevant national standards (e.g. UL 2034 or EN 50291-

2:2019).

5.1.2 An audible alarm shall be provided.

If detectors employing a COHb level algorithm, or other integrating alarm structures, include a switch to mute only the audible alarm, then warnings or other means shall be provided to protect such a switch from casual use. The switch shall not reset the detector and shall not mute the alarm for more than 6 min.

5.1.3 There shall be no power switch on the detector.

5.1.4 A non-mechanical indicator, e.g. some type of visual electrical indicator (lamp, LED, LCD, etc.), shall be provided on the detector to indicate that it is in operation.

5.1.5 A circuit self-check shall be provided that shall also give alarms for an electrically defective sensor or low battery condition. A testing procedure or test switch shall be provided for checking the alarm circuitry.

5.1.6 Detectors shall be designed and marked as drip proof or watertight in accordance with IP rating 42, as specified in IEC 60529:2013/Corr1: 2019.

5.1.7 Detectors shall be powered by the craft’s electrical system, or by a self-contained battery.

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