1. Passive Infrared Movement Detectors
Likewise known as PIR sensing units, these are the most common kind of sensors homeowners utilize since they are practical and budget friendly. The term passive suggests that these detectors run with no need to radiate and create their own energy. PIR sensing units can effectively spot modifications in the ambient temperature level as well as temperature. If these sensors find a temperature spike due to the presence of an intruder or foreign item, the alarm is set off. A thing to note is that infrared energy can not travel through glass, so the alarm won’t set off due to the existence of people or animals outside.
2. Ultrasonic Detectors
Ultrasonic detectors use high-frequency acoustic waves to spot any sort of movement within a restricted area. They transmit frequencies between 25 kHz and 75 kHz, which are inaudible to human ears. These frequencies are bounced off the walls, ceiling, as well as furniture in a secured space. And when there is any sudden change in the supported frequency, the alarm is set off. Any moving things can alter the frequency of the surrounding sound waves in the protected area, so these sensing units will not discriminate between intruders and passersby.
3. Microwave Detectors
Microwave detectors operate in the same manner as ultrasonic detectors. However, they use high frequency radio waves instead of acoustic waves. The benefit of using microwave detectors is that radio waves can go through walls, so they offer relatively more protection as compared with ultrasonic waves.
4. Magnetic Switches
Magnetic switches are normally utilized for safeguarding doors and windows. Their ease of use, durability, and price makes them a popular option. They consist of two different parts i.e. the switch and the magnet, and property owners can quickly install them themselves. The switch creates an electrical circuit with the magnet when closed since it consists of a spring. If a window or door is opened the circuit breaks and the alarm is set off.
5. Photoelectric Beams
Photoelectric beams use infrared light beams in order to spot the existence of a burglar. These infrared beam are usually stacked in rows of two or more. The house alarm system goes off if anyone blocks a beam.
6. Glass Break Detectors
When a glass breaks, different bands of frequencies are created including ultrasonic waves that are audible to human beings along with infrasonic that human beings can not hear. These sensors are set up beside glass panes, and the alarm sets off instantly when the glass breaks.