just out of interest, on a wireless pir, do these still have wall tamper switches? so if i was to pull a wireless sensor off the wall would the alarm go off? what about if i at the same time removed the battery from one of these pirs?
Even the cheap nasty toot usually have dual tampers.just out of interest, on a wireless pir, do these still have wall tamper switches? so if i was to pull a wireless sensor off the wall would the alarm go off? what about if i at the same time removed the battery from one of these pirs?
Some modern piezo drivers can routinely test that the element is functional with a very short chirp during which time the element's capacity and resonant frequency are checked. If these have changed the device is suspect. Whether this function is used ion alarms I do not know.Bernard. A standard wired siren unit won't tell you the strobe isn't working or the piezo siren - only that the tamper switch is closed. It's not uncommon to have a silent siren up there.
Any good panel relying on relay contacts will detect a stuck contact and report it as a fault.Also, a common problem with PIRs is that the relay contacts freeze in the closed position. It may look as if it's doing something but is in reality a complete ornament.
I said some drivers that produce the voltage to drive the piezo element have the means to check the element is functional. I do not know which, if any, domestic alarm systems use them. I have seen them used in factory warning beacons where a failed warning system is notified to the control operator and, in some cases where the hazards justify it, the line is automatically shut down.Give me the name of a good panel that does that then.
With a photo sensitive diode.And how does it test the strobe?
I am not going to turn on the other machine to look up manufacturers for you.And which sounders self test the piezo?
They are glorified door bells - nothing clever about them.
Wireless ones maybe, not much point in them being anything else really. But alarm sirens connected to the panel by a cable are a different matter. Two way communication over a secure and protected link so they can report problems to the panel to alert the owner of problems. Unlike the majority of wireless sirens which have to cry for help and hope someone reacts before the battery goes flat and with it the ability to cry for a new one.They are glorified door bells - nothing clever about them.
Wireless ones maybe, not much point in them being anything else really. But alarm sirens connected to the panel by a cable are a different matter. Two way communication over a secure and protected link so they can report problems to the panel to alert the owner of problems. Unlike the majority of wireless sirens which have to cry for help and hope someone reacts before the battery goes flat and with it the ability to cry for a new one.They are glorified door bells - nothing clever about them.
You obviously aren't an alarm engineer Bernard. They have a tamper switch - that's as good as it gets.
( Has anyone got the data for how much power a wireless PIR sensor uses compared to a wired PIR sensor ).
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