Re: Failure rate of window / door magnetic sensors

["Crash Gordon" <webmaster@xxxxxxxxxxxxxxxxxxxxx>]

They beat me to the punch...read my earlier post.



--
Crash Gordon
-------ouch------

<I feel like I'm diagonally parked in a parallel universe>
"shotgun boogie" <thatsallfolksl@xxxxxxxxx> wrote in message
news:6_ONi.157555$dI1.131801@xxxxxxxxxxxxxxx
| Crash Gordon wrote:
| > Actually your quite correct...I do remember one house that none of the
| > switches worked about a week after I put them it...after calming down
| > a pissed off client, come to find out ADT installer was there
| > "testing" all of my switches with a 12v 7amp battery and a siren.
| > Duh. Homeowner wanted me to replace all the switches...idiot. Told
| > him sorry...outta warranty have ADT fix what the exploded. He just
| > smoked dem contacts till they blew open and stayed open.
| >
| >
| > <I feel like I'm diagonally parked in a parallel universe>
| > "Nomen Nescio" <nobody@xxxxxxxxx> wrote in message
| > news:daf42df7c08b14d6247bde365382dfb0@xxxxxxxxxxxx
| >> Crash Gordon said:
| >>
| >>> It happens, usually it welds the switches closed, which is why we
| >>> always recommend the homeowner test all openings at least once a
| >>> year but definitely after a major lightning storm nearby.  I've
| >>> never found one go open though.
| >>
| >> Granted, welding shut seems to be the more common failure mode.  But
| >> sometimes, they do go open.  I think what happens is that the heat
| >> causes the glass tube to crack where the metal reed goes through the
| >> glass, causing it to lose its support and the spring tension that
| >> tends to keep the switch closed.  Back in the old days, some
| >> manufacturers used gold to plate the contacts of their reed
| >> switches.  Bad idea.
|
| What was ADT doing there?
|
| --
| js
|
| - The bigger they are, the harder they fall.
| ( Also, the harder they bite, punch, and kick.)
|
|