Glass Break Sensors

car-window-smashedGlass break sensors often come as standard with car alarms in New Zealand. As the name suggests, they are designed to detect if a window has been smashed.

Most are little more then a glorified microphone that detects high pitch sound. Normally they are installed in the front area of a vehicle, either below the dashboard or above it.

One of the weak points of a glass break sensor is that they are not very effective in large vehicles, such as vans where a sensor in the front is unlikely to detect sound in the back, let alone protect against a sliding window being removed. They are also not recommended for vehicles where window tint film is fitted.

Pillar-less windows and tint film both stop glass break sensors being effective

Pillar-less windows and tint film both stop glass break sensors being effective

Dynatron/Cyclop Glass Break Sensor

Dynatron/Cyclop Glass Break Sensor

Window tint film muffles the sound of glass breaking. Glass break sensors can also cause a false alarm if the sensitivity is set to high. The materials inside a car can cause a creaking sound as they expand and contract with a change of temperature which can be enough to trigger a overly sensitive sensor.

Ultrasonic sensors are a far more effective and reliable way of protecting the internal space in a vehicle and would be my choice over a glass break sensor every time. Thatcham approved alarms (CAT 1 and CAT 2-1) require a movement sensor, such as ultrasonics or a microwave sensor, so glass break sensors are not approved under these standards.

vehiclesecurity.co.nz-home

Share
Julian

About Julian

Owner and Installer at Obsessive Vehicle Security Limited.
More details here…

Please keep Comments relevant to the post and use the Contact form for enquiry’s

This entry was posted in Alarm Accessories, Sensors, Trouble Shooting!. Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *