This new publication is known as the Fourth Edition and replaces the Third Edition published in 2018, which is now withdrawn.

In the Second Edition of ISO 7240-7 published In 2011, ISO introduced the option to manufacture and supply optical smoke detectors in either of two sensitivity bands, the normal sensitivity band similar to that in EN 54-7 and a lower sensitivity band enabling the use of compliant detectors in applications deemed to present a higher potential for false alarms.

The principal change in the Fourth Edition provides a simplification in the way two sensitivity bands, Band 1 and Band 2, are specified and used throughout the standard, making it easier to read by avoiding unnecessary repetitions. A number of other editorial amendments have also been made in accordance to the latest IEC/ISO Directives for drafting standards. 

The well-established and proven requirements and test methods for product compliance are unchanged.

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