Magnetic Sensor Basic Question

[rustyjames]

Hopefully a simple but silly question.

I need to refit a surface mount rectangular magnetic sensor to a garage door that has just been replaced. Before the old door was removed I took off the magnet and sensor, leaving all the wiring intact (it runs to a small junction box type thing).

Now the silly bit - I carefully remembered that the sensor was fitted with the wire running up into it when fitted - what I didn't realise is the screw holes are countersunk on both sides so either side could potentially face the magnet.

Both the magnet and sensor have a pair of screw holes offset to one side (the opposite side to the wire entry on the sensor). I'm assuming the actual magnet/sensor themselves are the opposite side to the screw holes - i.e. when fitted the sensor which is mounted on the left has its screw holes offset to the left, and the magnet which is mounted on the right has its holes offset to the right.

Hope that makes sense and thanks in advance for any replies.

[Guest anguscanplay]

Hopefully a simple but silly question.

I need to refit a surface mount rectangular magnetic sensor to a garage door that has just been replaced. Before the old door was removed I took off the magnet and sensor, leaving all the wiring intact (it runs to a small junction box type thing).

Now the silly bit - I carefully remembered that the sensor was fitted with the wire running up into it when fitted - what I didn't realise is the screw holes are countersunk on both sides so either side could potentially face the magnet.

Both the magnet and sensor have a pair of screw holes offset to one side (the opposite side to the wire entry on the sensor). I'm assuming the actual magnet/sensor themselves are the opposite side to the screw holes - i.e. when fitted the sensor which is mounted on the left has its screw holes offset to the left, and the magnet which is mounted on the right has its holes offset to the right.

Hope that makes sense and thanks in advance for any replies.

wont matter which way round they are tbh - you could try them on walk test taped together first to prove they work

angus

[rustyjames]

Thanks for the quick reply - was just worried that one way might be stronger than the other, and if I got them both the wrong way round I might be more likely to have intermittent false alarms. I will be mounting both quite close together, and will definitely do a walk test.

[morgan306]

If my memory serves me correctly,screw holes furthest away from the opening, that goes for reed and magnet.

[arfur mo]

Thanks for the quick reply - was just worried that one way might be stronger than the other, and if I got them both the wrong way round I might be more likely to have intermittent false alarms. I will be mounting both quite close together, and will definitely do a walk test.

one thing you need to be careful of with the new door, it may have some play 'settle either to the left or right having a movment of say an inch. can sometimes prevent setting or cause the door to strike the reed.

so if you can push the door hard over to the side you mounting the contact on prior to fitting it then can't strike the reed.

when done operate the door several times on walk test of chime (if programmed for it) to help make sure it wont play up later.

regs

alan

[rustyjames]

All great advice - thanks guys. Will give it a try and then report back.

[rustyjames]

Sorry for the delay in responding back - all connected back up and working fine - thanks for the help.

[arfur mo]

Sorry for the delay in responding back - all connected back up and working fine - thanks for the help.

a pleasure, thanks for coming back as it's our only 'reward'

(but i like a single malt )

regs

alan