Re: Wireless Door Lock Sensor

["Bill" <bill190nospam@xxxxxxxxx>]

The problem with "door lock sensors" would be; the locks themselves, the
doors, the jambs, and maintenance/replacement of all of these.

Wood doors will grow or shrink with humidity changes. So if you have a
switch in the jamb which detects that a dead bolt is thrown, you may have
trouble adjusting it if the door is growing and shrinking with humidity
changes.

Then hinges will come lose and the alignment of the door may change.

Switches located in the jamb would need maintenance and adjustment. Say a
new door and deadbolt was installed with a longer "throw". You would need to
be able adjust the switch back for the longer throw. So access covers to the
switches would be needed as well as a method of adjusting the switch.

Some safe/vault doors have such sensors. But you have an all metal door and
jamb along with a precision locking system.

Install switch in locksets only? Most residential locksets are far from
being precision devices. Imagine some sort of switch in a cheap residential
regular door knob - the kind where there is so much play, you can wobble the
whole thing every which way.

I would think the best solution would be a precision lockset specifically
designed for this. The deadbolt would probably be easy. But the door knob
lock would need to be a positive "locked" "not locked" design without any
play or in-between allowed.

Also if it is a wired device, the wire to the door is prone to wearing out
and needing replacement. (As is with businesses with gless break sensors on
their door windows.)