Motoring Discussion > Car alarm in ferry Miscellaneous
Thread Author: movilogo Replies: 18
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 Sun 8 Apr 12 15:54 
 Car alarm in ferry - Zero
Alarms usually have three triggers

Anti-Tilt, Usually nothing more a mercury tilt switch or mechanical plum bob, if an old one, or some form of accelerometer or position switch, akin to the ones fitted to modern phones.

Volumetric, checks for changes in air pressure within the passenger compartment of the car.

Door/boot/bonnet opening. Used to be nothing more than using the door switch, but now incorporates voltage drops.

It was usually the vibration of concorde on the windows of cars, causing pressure changes within he car that fired that one off!


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 Messages Author Date
 Car alarm in ferry  movilogo 6 Apr 12 11:04
 Car alarm in ferry  Zero 6 Apr 12 11:08
 Car alarm in ferry  Old Navy 6 Apr 12 11:11
 Car alarm in ferry  movilogo 6 Apr 12 11:16
 Car alarm in ferry  sherlock47 6 Apr 12 11:30
 Car alarm in ferry  WillDeBeest 6 Apr 12 11:38
 Car alarm in ferry  mikeyb 6 Apr 12 12:24
 Car alarm in ferry  Rudedog 6 Apr 12 16:27
 Car alarm in ferry  Dulwich Estate 7 Apr 12 09:08
 Car alarm in ferry  Rudedog 7 Apr 12 09:23
 Car alarm in ferry  Mike Hannon 8 Apr 12 08:09
 Car alarm in ferry  - 8 Apr 12 08:25
 Car alarm in ferry  Lygonos 8 Apr 12 09:26
 Car alarm in ferry  Dulwich Estate 8 Apr 12 11:10
 Car alarm in ferry  Bromptonaut 8 Apr 12 12:39
 Car alarm in ferry  Mike Hannon 8 Apr 12 15:19
 Car alarm in ferry  Rudedog 8 Apr 12 15:43
 Car alarm in ferry  Zero 8 Apr 12 15:54
 Car alarm in ferry  Avant 8 Apr 12 16:27
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