Yes or some circuit where the interruption only makes a short time of non
connection. Brian

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"williamwright" wrote in message
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On 27/04/2021 17:39, Steve Walker wrote:
Do the receivers only have one contact each or are they changeover? If
the latter, then change them to go CC on detection and feed each to an
interval timer relay, wiring the relays NC contacts in series.



That sounds very promising. They are changeover. Cheers.

Bill