Surface - High Security Contact - Grade 3 - Large heavy duty - Anodised Aluminium. Triple Biased with Active tamper. 5mm operating gap. Includes security cover plate. 109L x38w x19D. The VS303 sensor, magnet and cover are supplied as a matched set. Do not attempt to use the sensor with any other magnet except as supplied or you may experience incompatibility problems. Mount the magnet to the opening fixture and fix the cover with the screws provided so the magnet fixings are not visible and the black spot on the underside of the cover is still visible. Fix the sensor such that when the door is closed, all the fixing screws are covered and the dots on the magnet and sensor are aligned. Ideally the gap between sensor and magnet should be no more than 5mm.
