Pyrexx PX-1 Smoke Alarm Black

Product Information

As of February 2022, the Nest protect smoke and CO alarm no longer meet the requirements of the new Scottish alarm laws. This is because, while it can be linked to other Nest alarms, it has no way of detecting heat rises or of being linked to another heat alarm.

Some smart models sound an alarm on your smartphone and through the alarm itself when triggered – this is the most helpful kind of smart alarm. Smart smoke alarms are designed to sound the alarm when they detect smoke, as a conventional smoke alarm would. But the unique selling point of a smart smoke alarm is the ability to send alerts to your phone when there’s a fire. Heat (thermal) alarms detect heat (hot air) instead of smoke. The alarm is triggered when the temperature within the sensor chamber reaches over 58 degrees Celsius – generally when a fire is well established.Horizontal optical bench housing infra-red emitter and sensor, arranged radially to detect forward scattered light. Weight We test smoke alarms using an aerosol tester, sprayed in the direction of the alarm for up to five seconds from a distance of 30cm. If the alarm doesn’t respond within four seconds, we don’t recommend it. Having completed this functional test, we take a careful look at any controls, screens, or indicators to see how clear and effective these are. As a rule of thumb, it’s best to use optical alarms in living rooms, bedrooms or downstairs hallways where you either have a lot of upholstered furniture and soft furnishings or the alarm is likely to be set off by cooking fumes. Keep ionisation alarms for upstairs hallways or areas where dust or exposure to the elements (say, through an open door) might potentially set off an optical sensor. If in doubt, go optical or use a multi-sensor alarm. Use of ionisation alarms is generally being discouraged by many fire services, and some manufacturers have now discontinued their ionisation products. So if you’re out of your home and not near your phone when the messages come through, you’ll have no way of knowing the alarm was sounding. This also allows the sensor threshold level to be increased, thereby improving the signal to noise ratio and reducing susceptibility to false alarms. The ALN-EN(BLK) smoke chamber is easily removed or replaced for cleaning and utilises a unique improved baffle design which allows smoke to enter the chamber whilst keeping out ambient light.

These alarms are more sensitive to smaller particles of smoke produced by the flaming stage of fires than optical alarms, and more easily triggered by cooking – causing false alarms.

Stay safe and get an early warning of a fire with the smartest, most effective smoke detectors for every budget

If you buy a battery-powered smoke alarm (rather than a mains-powered one), you'll need to decide whether you want one with a replaceable 9V battery, or sealed fixed-life battery Interlinking when one alarm goes off, all the connected detectors are activated. This can be particularly useful in a larger house.

In Scotland, since February 2022, interlinked smoke and heat alarms have needed to be fitted in all homes. Fire and rescue services attended over 150,000 fires last year in England alone, and while the number of fire fatalities dropped to their lowest ever figure, 240 people still lost their lives. Buying a smoke alarm is one of the most important steps you can take to protect your home, your life and the lives of your family and friends. It can give you early warning of a fire before it spreads, and the best chance of getting everyone safely out of the house. Different makes and models will be slower or faster to detect smoke coming through and have different alarms working at different volumes. Some even feature voice alarms or strobing lights. However, any alarms sold in the UK have to meet BS EN 14604:2005, which specifies the requirements, tests and performance criteria for smoke alarms using optical or ionisation sensors. Heat alarms are governed by the separate BS 5446-3:2003 standard.On a lighter note, Google’s data also revealed that the day when smoke alarms are most likely to sound in the UK is pancake day. Is the Nest Protect smoke and CO alarm suitable for homes in Scotland now that the law has changed? Smoke particles change the balance of the current. When this happens a signal is sent to the integrated circuit and the alarm sounds. You can put them in kitchens and garages because they’re not prone to false alarms from cooking or exhaust fumes. But they are slower to respond than smoke alarms.