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Motion detectors – which type is best for your needs?

Motion detectors can play a vital role in your security set-up. Sensors can be placed inside and outside your home or business to detect movement and alert you to an intruder.

When motion is detected, an alert is sent to your control panel. This can either set off an alarm, send a message to your security team or local authority, or prompt your surveillance cameras to start recording. It can do all of these, depending on the level of security you need.

There are different types of motion sensor, and which you choose will depend on your domestic or business circumstances.

Passive infrared (PIR)

The most common type of motion detector is one where a passive infrared sensor detects body heat (infrared energy).

The PIR motion sensor warms up and is able to detect heat and movement in the zone around it. It reacts to sudden changes in temperature, so that if the infrared energy levels suddenly alter, the sensor will pick up on it and trigger an alarm.

This is the most widely used type of motion sensor in homes with pets as the sensor can be programmed to ignore the movement of mammals of a certain weight. You can look for pet-friendly motion sensors that offer adjustable sensitivity levels for households with pets.

PIR sensors don’t have the same range as microwave sensors, which can cover wider areas.

Microwave (MW)

Microwave sensors emit microwave pulses that measure reflections off moving objects.

They cover a larger area compared to PIR sensors and are more expensive. However, they can be prone to interference from electrical equipment. Therefore, they may not be suitable for certain business premises or rooms in your home.

Dual technology motion sensors

You can combine PIR and microwave sensors to have the best of both. This creates a responsive security system that is less likely to raise a false alarm.

This is because both sensors – the passive and active – need to be triggered to send an alert.

Area reflective sensors

Area reflective sensors operate by sending out infrared rays from an LED. The reflection of these rays is used to measure the distance between certain objects.
An alarm is activated when there is a change in this distance, e.g., someone comes between the rays in the area covered.

Contact sensors

Contact sensors can be used on doors and windows. A magnet is positioned so that when the door or window is opened, it will move apart from a second magnet and sensor. The alarm is triggered when the magnets are forced apart.

Video motion sensors

As part of your overall security system, you may have surveillance cameras. These can be linked to your motion sensors.

When the motion sensors detect movement, they’ll cause security cameras to start recording. This can be as well as or instead of setting off an alarm.

The advantage of video motion sensors is that rather than having your cameras recording hours of footage, they only record what is relevant.

Would you like advice on the best motion detectors for your home or business?

Stuart can provide a FREE security survey and advice on the best security solutions to meet your needs and budget.

Call Stuart on 07900 335525.