There is specific door magnetic alarm sensor for rolling door of garage and shops. When the rolling door is opened at arm status, the wireless door magnetic contact switch will contact with burglar alarm system, active siren strobe and send alarm information to registered alarm phones, security service center.
There are two parts of the rolling door magnetic alarm sensor. One part is magnet. Another part is the reed switch connected with emitter by steel pipe.
The magnet part must be fixed on the ground beam of the rolling door. To ensure that the magnetic force of the magnet is not masked, please leave a gap between ground beam and magnet head and end.
The reed switch must be fixed just below the fixed magnet. It can be fixed on ground or in ground below the fixed magnet. The distance between the magnet and the reed switch must be less than 2cm when the rolling door is closed. Refer to fig.
The wireless emitter must be fixed in the host communication distance. And it can not be fixed on the metal material. The steel pipe can be extended to meet the distance requirement.

As a conclusion, we would like to make a note for you.
1. Please leave a gap between magnet and ground beam of rolling door.
2. Please make sure the reed switch is fixed just below the magnet and the distance between each other is less than 2cm when rolling door is closed.
3. Please do not fix the wireless emitter on metal material.