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How to connect window sensors?

Discussion in 'Security Alarms' started by [email protected], Oct 8, 2007.

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  1. Guest

    When we purchased our home it did not have a security system. I
    installed one myself, really not knowing anything about the proper
    ways of wiring one up. For each window, I drilled up through the
    header and ran the sensor wires along the edge of the window. It
    really is not noticable. I had sensors with very long leads and I was
    able to make all my connections in the attic using butt connectors.

    But since I lost many sensors due to a lightning strike, the
    replacement ones I bought have much shorter leads. These are the
    small sensors that do NOT have the screw terminals. I can't make the
    connections in the attic, so have been soldering the new sensors
    (staggering the solder joint for each wire) and using shrink tube to
    insulate. This makes for a very small profile connection compared to
    butt connectors. Is this a good idea? How do you pro's do it for a
    repair job?

    Another question... I have learned from this newsgroup that my
    normally closed contact sensors failed since they were basically
    welded together. Would I have been better off using normally open
    contacts? I assume those are wired in parallel, and since NC ones are
    wired in series, I can't just change, but I was just curious if they
    fail due to lightning.

    Thanks in advance.
     
  2. Jim

    Jim Guest

    I can tell you that a biased contact on a chain link fence is like a
    lightning rod in one of my installations. Went though three Sentrol
    biased contacts before the client finally had me give it up. We put up
    cameras with motion detection in the storage yard instead.
     
  3. Jim

    Jim Guest

    A contact can go bad in the open condition as well as closed.
     
  4. As long as the connections are soldered and staggered so there's no
    way for the wires to short, that will work fine. There's another
    option which you could have chosen. There are miniature, wide-gap
    magnetic contacts with screw connections you could have used. Those
    would have allowed you to use the existing wires. However, since you
    already bought the contacts stay with what you have.
    You assume correctly regarding the wiring method but no, that would
    not make the system more lightning resistant. The most significant
    thing you can do to protect against future strikes is a bonded
    ground. This was discussed earlier so I won't repeat it unless you
    ask.

    --

    Regards,
    Robert L Bass

    =============================>
    Bass Home Electronics
    941-925-8650
    4883 Fallcrest Circle
    Sarasota · Florida · 34233
    http://www.bassburglaralarms.com
    =============================>
     
  5. Crash Gordon

    Crash Gordon Guest

    troubleshooting open circuit switches is a nightmare - use what you are
    using.

    solder and heat shrink tubing is fine...probably the best way if you have
    time to do it that way - you will seldom find it in production work though.



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

    <I feel like I'm diagonally parked in a parallel universe>
    | When we purchased our home it did not have a security system. I
    | installed one myself, really not knowing anything about the proper
    | ways of wiring one up. For each window, I drilled up through the
    | header and ran the sensor wires along the edge of the window. It
    | really is not noticable. I had sensors with very long leads and I was
    | able to make all my connections in the attic using butt connectors.
    |
    | But since I lost many sensors due to a lightning strike, the
    | replacement ones I bought have much shorter leads. These are the
    | small sensors that do NOT have the screw terminals. I can't make the
    | connections in the attic, so have been soldering the new sensors
    | (staggering the solder joint for each wire) and using shrink tube to
    | insulate. This makes for a very small profile connection compared to
    | butt connectors. Is this a good idea? How do you pro's do it for a
    | repair job?
    |
    | Another question... I have learned from this newsgroup that my
    | normally closed contact sensors failed since they were basically
    | welded together. Would I have been better off using normally open
    | contacts? I assume those are wired in parallel, and since NC ones are
    | wired in series, I can't just change, but I was just curious if they
    | fail due to lightning.
    |
    | Thanks in advance.
    |
     
  6. Bill

    Bill Guest

    You can get a long drill bit (like 5 ft.) which has a hole in one end in the
    electrical department of home improvement stores, electrical supplies, etc.
    Then drill up from the window opening into the attic. or drill down from the
    window opening to the baseboard.

    So the hole drilled is inside where the window opens.

    Then pull a wire through the hole (using hole in drill bit to attach wire),
    then solder on wires as you did and use electrical tape or whatever.

    Then squirt silicone into the hole and gently push sensor back into the hole
    so it is flush with the window opening surface. Then glue magnet to window
    or drill hole in window wood and stick magnet in hole.

    Stick dirt and dead flies over sensor before silicone dries. Then you have a
    sensor on that window and no wires or contacts visible!

    We spent two weeks doing this to a guys house who went out of town while we
    were doing the work. He came back, called the office and was pissed! He was
    really ticked we did not install his system like we said we would. We said
    we did install it! He did not believe us. We had to go out and put a beeper
    on and open/close each window to prove it was installed. And we pointed to
    where the contacts were. He said "I don't see anything!" We said well that
    is what you paid for....
     
  7. Jim

    Jim Guest


    Where do you buy your dead flies?
     
  8. Crash Gordon

    Crash Gordon Guest

    ADI has them, but they come from China and may contain lead.



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

    <I feel like I'm diagonally parked in a parallel universe>
    | > You can get a long drill bit (like 5 ft.) which has a hole in one end in
    the
    | > electrical department of home improvement stores, electrical supplies,
    etc.
    | > Then drill up from the window opening into the attic. or drill down from
    the
    | > window opening to the baseboard.
    | >
    | > So the hole drilled is inside where the window opens.
    | >
    | > Then pull a wire through the hole (using hole in drill bit to attach
    wire),
    | > then solder on wires as you did and use electrical tape or whatever.
    | >
    | > Then squirt silicone into the hole and gently push sensor back into the
    hole
    | > so it is flush with the window opening surface. Then glue magnet to
    window
    | > or drill hole in window wood and stick magnet in hole.
    | >
    | > Stick dirt and dead flies over sensor before silicone dries. Then you
    have a
    | > sensor on that window and no wires or contacts visible!
    | >
    | > We spent two weeks doing this to a guys house who went out of town while
    we
    | > were doing the work. He came back, called the office and was pissed! He
    was
    | > really ticked we did not install his system like we said we would. We
    said
    | > we did install it! He did not believe us. We had to go out and put a
    beeper
    | > on and open/close each window to prove it was installed. And we pointed
    to
    | > where the contacts were. He said "I don't see anything!" We said well
    that
    | > is what you paid for....
    |
    |
    | Where do you buy your dead flies?
    |
     
  9. Jim

    Jim Guest

    Must be that breed of fly that only walk from one place to another.
     
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