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When installing on a vertical surface, such as a wall, mount the sensor with its long dimension vertical and its interior weighted blade downward, as shown in the illustration.
On a ceiling, the sensor may be mounted directly thereon upside down without the use of any bracket. When protecting a window, mount the vibration sensor on the frame of the window rather than directly on the glass. This reduces the danger of false alarms from heavy vehicles passing by or from tapping on the window by pedestrians. When connected in a fast response approximately 10ms closed circuit protection loop, vibration sensors will initiate an alarm when a blow of suf- ficient force strikes the protection surface.
The sensors can be adjusted to respond on virtually any surface e. Low frequency vibration caused by normal building vibration has little effect on the sensor, as it is designed to respond much more efficiently to sharp blows. The sensor contacts are enclosed in an inner compartment that guards against erratic operation in dusty or particle laden environments. The coverage of vibration sensors on walls and ceilings can be increased if the contacts can be mounted on furring strips.
On walls, run furring strips vertically, from the ceiling to about 4 feet from the floor the distance between them is dependent on the type of construction. On ceilings, run the furring strips from one end of the protected area to the other.
A typical installation for wall protection might consist of vibration sensors mounted 42 to 48 inches above the floor and spaced at 36 to 48 inch intervals along the wall. Optimum locations for vibration sensors can best be determined by experimentation, because of the variety of construction materials and methods that may be encountered.
Initial Adjustment Mount the sensor leave the cover off. If the sensor contacts are already closed, turn the screw counterclockwise until they open.
Final Adjustment Connect the sensor in series with the closed protection circuit intended for it. Light blows with a small hammer, approximately 2 to 3 feet from the sensor, will permit its adjustment for desired response. The sensor can be made less sensitive by turning its adjustment screw clockwise.
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