March 11, 201511 yr You could use, most dectectors, Optex now make a saver, your could use a Honeywell PIR, like an IS215T or their quad elemnet. Take a look at one or two, and so long as it is hard wired, buy the one you like the look of
March 12, 201511 yr Author Optex would suggest: https://www.securitywarehouse.co.uk/catalog/optex-fx50qz-passive-detector-p-435.html
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