Guest hac Posted March 16, 2004 Share Posted March 16, 2004 can anyone help? i have a pir that points at the front door and goes off when letters come through. is this normal? and why does it happen? hac Link to comment https://www.thesecurityinstaller.co.uk/community/topic/1725-postman/ Share on other sites More sharing options...
Guest lev Posted March 16, 2004 Share Posted March 16, 2004 NO! I think you have radioactive letters. Try moving the sensor to diffrent location. Its obviously sensing infra red somehow. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/1725-postman/#findComment-9392 Share on other sites More sharing options...
Guest simonrob Posted March 17, 2004 Share Posted March 17, 2004 Either move the sensor or mask out the part of the lens that is picking up the letterbox. It would probably be easier to move it. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/1725-postman/#findComment-9404 Share on other sites More sharing options...
Guest perwin Posted March 17, 2004 Share Posted March 17, 2004 Could be cold air comming through the letterbox. Is there a metalic internal letterbox flap; if so, this might be reflecting another IR source as a letter swings it up. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/1725-postman/#findComment-9433 Share on other sites More sharing options...
breff Posted March 17, 2004 Share Posted March 17, 2004 Check the pulse count in the PIR, 1 is a no no! The opinions I express are mine and are usually correct! (Except when I'm wrong)(which I'm not) Link to comment https://www.thesecurityinstaller.co.uk/community/topic/1725-postman/#findComment-9439 Share on other sites More sharing options...
Guest hac Posted March 17, 2004 Share Posted March 17, 2004 thanks for your help i do have a metal flap, which is coming off! i`ve angled the pir away, how do you adjust the pulse count, it`s a reflex pir Link to comment https://www.thesecurityinstaller.co.uk/community/topic/1725-postman/#findComment-9450 Share on other sites More sharing options...
Guest RICHL Posted March 17, 2004 Share Posted March 17, 2004 There are usually two set of pins on the PCB, one for LED on/off and the other is the pulse count (may be numbered 1,3,5) - move the jumper to another pair of pins - the higher the number the lower the sensitivity. But as its a reflex personally I'd change it for a real PIR. Link to comment https://www.thesecurityinstaller.co.uk/community/topic/1725-postman/#findComment-9468 Share on other sites More sharing options...
Service Engineer Posted March 17, 2004 Share Posted March 17, 2004 Remove the top right hand side jumper to enable the SLOW pulse. ........................................................ Dave Partridge (Romec Service Engineer) Link to comment https://www.thesecurityinstaller.co.uk/community/topic/1725-postman/#findComment-9474 Share on other sites More sharing options...
whistle Posted March 19, 2004 Share Posted March 19, 2004 resite the pir to above the door loking into the hall = problem solved Link to comment https://www.thesecurityinstaller.co.uk/community/topic/1725-postman/#findComment-9712 Share on other sites More sharing options...
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