lefttopcorner . toprightcorner
BTS Shelter


The function of a sensor is to sense the change in 'state' of an object, space or any specified parameter. e.g. a Door sensor can sense the movement of the door (from close to open), a PIR can detect the change in heat due to a movement of a human being in it's sensing range etc. There are various types of sensors available in the market that are based on different principles. All the sensors give their output to a control unit which acts upon it and depending upon what the owner has programmed for, will sound an alarm or dial a phone or switch on lights etc. Many times in the low cost models, the sensor, the control unit as well as the alarm are built into a single housing, however the advanced units have all these three components of a alarm separate so that the owner can mix-n-match. The descriptions of various sensors are given hereunder.

leftbotomcorner . rightbotomcorner