published on 23/03/2026
Written by editor
Written by editor
Intruder alarm systems remain one of the most effective and widely used methods of protecting both residential and commercial properties. Their popularity is driven by their affordability, ease of installation and proven ability to deter criminal activity.
Using motion detection technology and a range of sensors, intruder alarms are designed to identify unauthorised entry and immediately trigger an audible alert. The loud alarm acts as a powerful deterrent, drawing attention to the incident and encouraging intruders to abandon their attempt and leave the premises.
Modern intruder alarm systems can also be integrated with monitoring services, video surveillance and mobile notifications, providing an enhanced level of protection and enabling a rapid response when an incident occurs.
These systems come in a variety of types, all of which are designed in one way or another to detect the presence of unwanted intruders. For businesses, the alarms in question will usually be activated outside of business hours when there shouldn’t be anyone on the premises in question.
This article will examine how these sensors work and, more importantly, whether they can actually protect your business.
There are several types of motion detectors of varying reliability :
Probably the most common type of motion detector, these emit infrared waves that can detect changes in temperature caused by the presence and movement of people. Differing versions of this system type are used in domestic properties and can be set so that they only detect something large enough to be a person, and pets wandering past the sensors don’t set off the alarm.
These sensors emit ultrasonic (high-frequency) sound waves and monitor the reflected signals. If an object moves within the protected area and disrupts the sound pattern, the system detects the change and triggers an alarm.
These sensors are designed to detect the movement or opening of specific entry points, most commonly doors and windows. Rather than detecting the movement of people, they identify when a protected door or window has been opened, forced or tampered with. As intruders typically need to gain access through an entry point, these sensors provide an early warning of a break-in attempt. The earlier an intrusion is detected, the sooner an alarm can be raised, helping to deter the intruder and enabling a faster response.
Intruder alarm systems are a proven deterrent to criminal activity, which is why many homes and businesses choose to display external sounders and warning signage to highlight that their premises are protected.
As standalone systems, intruder alarms are particularly effective at deterring opportunistic criminals, who are often discouraged by the presence of an alarm system or abandon their attempt once an alarm is activated.
Their effectiveness can be further enhanced when combined with 24/7 professional monitoring. In the event of an activation, trained operators can assess the situation and coordinate an appropriate response, providing an additional layer of protection for people, property and assets.
At Scutum Fire & Security, we offer both wireless and hardwired intruder alarm systems. The right solution will depend on your property, operational requirements and level of protection needed. While both options provide effective security, wireless systems are often favoured for their ease of installation and minimal disruption to existing buildings and business activities.
At Scutum Fire & Security, we design, supply, install and maintain intruder alarm systems that combine motion detection and a range of advanced sensing technologies to protect your premises.
For enhanced protection, our systems can also be connected to our 24/7 Alarm Receiving Centre (ARC). In the event of an alarm activation, trained operators can immediately assess the incident and initiate the appropriate response procedures, providing an additional layer of security and peace of mind.
