Burglar Alarm – Detection Devices, Control Equipment & Sounders and Signaling

Detection Devices

Passive Infra-Red (PIR) Detector

One of the most commonly used movement detectors are PIRs that are perfect for indoor use. Due to their sensitivity is generally avoided in places with dust, damp or where the temperature of the room is too low or high to ensure the correct operation of the device. Depending on the manufacturer, there are certain variations of PIRs, such as the ones mounted on the ceiling with 360-degree movement. But the most frequently used are the wall-mounted ones, installed at the height of 1.8-2.5m, having a detection range of 10-15m at an angle of 15-90 degrees. PIRs contain a pair of sensors located next to each other, and when someone enters the room, the signal differential changes between the two sensors due to the change in heat, sending a signal to the alarm to engage.

They are generally used in: residential houses, shops and offices.

Dual Technology PIR/Microwave

As its name suggests, this type of sensor utilises both PIR and Microwave detection methods and to sound the alarm, both of the elements have to be triggered. The PIR part works as explained above. The Microwave detector generally oversees the space by emitting a microwave signal that bounces across the room and will go back in the form of a value to the unit. If someone enters the room, this value will change due to the movements causing the alarm to employ. 

Generally used in: out-buildings, workshops, factories and garages.

Curtain PIRs

This detection device has been specifically designed to monitor door and window movements and other chosen areas. The sensor focuses on a narrow zone at long-range detection, allowing them to protect sites with large glass doors and windows.

Generally used in: doors and windows.

External PIRs

When it comes to using detection sensors outdoors in a harsh environment, external PIRs could be used. Sophisticated detection algorithms are used to understand irrelevant movements, such as rain or snow.

Generally used in: outdoors.

Door contacts

Door contacts are another commonly used sensor, coming in different sizes and shapes to fit most critical areas. They are composed of two elements, one housing the sensor and the other being a magnet. When the door or window is opened, the magnet breaks up from the sensor, sending a signal to the alarm to activate.

Generally used for: entrance doors.

Control Equipment


Wired control equipment doesn’t use batteries, making the maintenance easier as no battery replacement is required. The only battery changes needed are in the main control panel every five years.  


Wireless control panels have been commonly used recently due to their easy and cost-effective installation. However, the maintenance costs are slightly higher due to frequent battery replacements. But the fact that it is wireless makes it easy for any of the sensors or the control panel to be moved while redecorating or doing general maintenance. 

Sounders and Signaling

Audible warning devices

This warning device would emit a loud sound by the noise standards to alert and intimidate any potential intruders. 

Alarm signalling

Alarm signalling devices are more complex, as they use a technology called Alarm Transmission System (ATS), which is used to send alarm events to an Alarm Receiving Centre (ARC). Receiving a valid signal from the monitored building, the operator will contact the person in charge or call the relevant authorities to the site.

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