Contact sensors
Contact principle of operation
— only break sensors are made contact (see "Destination"). As the name implies, such devices react to the contact of a foreign object with glass. They are installed, usually, also directly on the glass. There are two types of such sensors: mechanical and electrical.Mechanical sensors, in fact, are vibration sensors and react not to breaking, but to glass shaking. They are good because they work not only in case of damage, but also in case of other influences on the glass — for example, when trying to cut a piece out of it or remove it entirely. On the other hand, such a sensor can falsely trigger from rain, hail, strong winds, a blow from a nearby tree branch, etc.
Electrical sensors, in turn, consist of the actual sensors and conductive paths that are laid on the glass. When the glass is broken, the tracks are broken and the device is triggered. Such systems give a signal only if there is a real damage to the glass. The disadvantages of electrical sensors are the difficulty in installation and unsuitability for some types of glass.
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