Surface Mount Magnetic Sensors are used to protect doors in Wired Burglar/intrusion alarm system. The switch is mounted to the surface of a door or window, the switch has a contact, which is closed by magnetic field generated by magnet. When the door or window moves away from the magnet, the switch opens and it is sensed by the alarm control panel.The sensors should be placed from inner side of the door ,Surface Mount Sensors have two parts one reed switch and one Magnet.Now Lets See where these 2 Parts should be placed in a Door while installation.
Placing of Reed Switch Part
The Reed Switch Part is the wired part of the sensor.Wiring From alarm panel zone should be connected to the terminals on the Reed switch part.So keep in mind that this part should be placed at an fixed place of the door as it involves wiring ,that is in Doorframes. Look at the picture above to understand clearly.
Placing of Magnetic Part
The Other part i.e is magnet part should be placed in the moving part of the door.It should be drilled properly so that it does not change position.
Working of Magnetic Sensor
When the Reed switch part and magnet part are close to each other it creates an closed circuit as the reed switch will be closed due to the magnetic pull generated by the magnet part,when the door is opened (Alarm in Armed state) magnet part moves away from the switch resulting in loss of magnetic pull which in turn results in open circuit,this will make the alarm to raise.
Placing Distance between Reed Switch part and Magnet Part ?
You can Place both parts at a distance where you get continuity when checked with a multi meter.
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