SENTROL Application notes - Alarms BC
SENTROL Application notes - Alarms BC
SENTROL Application notes - Alarms BC
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Commercial <strong>Application</strong>s<br />
APPLICATION<br />
INSTALLATION<br />
RECOMMENDED<br />
PRODUCTS<br />
PROTECTING THICK GLASS<br />
Acoustic sensors and shock sensors are rated for glass thicknesses up to 1/4 in.<br />
(6.4 mm). Some installations may have glass thicker than 1/4 in., yet the customer<br />
still wants glass break detection.<br />
The 5725T ShatterSwitch can be used to protect thicker glass with some reduction<br />
in range. The ShatterPro II is not designed to protect thicker glass. Its<br />
effectiveness will be reduced if protecting thick glass. If ShatterPro II acoustic<br />
sensors are used, the end-user should be warned that capture rate is reduced as much<br />
as 50%.<br />
Shock sensors may be used on thick glass if they are thoroughly tested. Thick<br />
glass absorbs much of the shock energy from a break, and therefore is more of a<br />
challenge for glass break detection.<br />
For on-the-glass shock sensors, mount the sensor in a corner of the glass<br />
approximately 1 in. (2.54 cm) in from the corner. Test the sensor by rapping the far<br />
opposite corner of the glass with a screwdriver handle. The sensor must trip to this<br />
rap test. If the sensor fails to trip, mount additional sensors in the other corners<br />
until at least one sensor trips to rapping the glass at every point on the window.<br />
Frame mounted shock sensors are tested in the same manner. Sensors such as the<br />
5425 have a sensitivity adjustment to increase range of the sensor if needed. For<br />
best false alarm immunity, set sensitivity no higher than half-way. Use additional<br />
sensors as needed.<br />
For shock sensor protection use the 5115/20 mounted on the glass, or the 5425<br />
mounted on the frame. The 5426 shock sensor also has a built-in reed switch with<br />
magnet for detecting forced opening of a door or window. For acoustic sensor<br />
protection, use the 5725T ShatterSwitch and mount within six feet of the farthest<br />
point of the protected glass.<br />
GLASSBREAK SENSORS<br />
1.21
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