English to Russian Tech/Engineering Engineering (general) fire detection and alarm systems

[False alarms]

Where human or industrial activity during working or wakeful hours could result in false alarms, particularly where the presence and behaviour patterns of people make it unlikely that a fire could go undetected by human agency, it may be useful to consider an activity related system.

A few examples of activity related systems are listed below:

1) The simplest application could be for a system that switched from manual detection during working hours to automatic detection in silent hours (i.e., outside working hours);
2) In a system which allows variable detection algorithms, it may be possible to use different algorithms (or change the recognition patterns) during working hours so that the system is less likely to give false operation in response to conditions which may commonly arise during working hours;
3) Protection by smoke detectors in silent hours could be changed to heat detectors during working hours
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Суть этой системы мне ясна, но никак не могу придумать нормальной формулировки – всё очень громоздко получается.