Pgordon

I've been continuing searching, and I've found a couple that claim to be what I need: https://www.amazon.co.uk/OWSOO-Infrared-Microwave-Detector-Pet-Immunity/dp/B086KZLBHS/ref=pd_rhf_dp_s_pop_multi_srecs_sabr_0_7/261-3684634-4703540?_encoding=UTF8&pd_rd_i=B086KZLBHS&pd_rd_r=0c400fde-1f11-4439-a0f7-1e0b458ff418&pd_rd_w=x3VtB&pd_rd_wg=cAGmP&pf_rd_p=5864a8c4-0ac6-4e57-aa01-41e26a7ef9f7&pf_rd_r=Q17WB9KHH8YJ11XB6S1T&psc=1&refRID=Q17WB9KHH8YJ11XB6S1T or perhaps https://www.amazon.co.uk/Anti-Pet-Infrared-Detector-Security-Waterproof/dp/B07MZTYVBK

Thanks, of course the system came long before there was any suggestion of pets... Do you think a dual-tech sensor might work better than just IR ? I'd not thought of putting a standard sensor in its place, - I'd no idea there were ceiling brackets for these sensors, but wouldn't the detection pattern be "off"..? Cheers