Type of Smoke Detectors on the market

Photoelectric Detectors

In one type of photoelectric device, smoke can block a light beam. In this case, the reduction in light reaching a photocell sets off the alarm.

In the most common type of photoelectric unit, however, light is scattered by smoke particles onto a photocell, initiating an alarm. In this type of detector there is a T-shaped chamber with a light-emitting diode (LED) that shoots a beam of light across the horizontal bar of the T. A photocell, positioned at the bottom of the vertical base of the T, generates a current when it is exposed to light.

Under smoke-free conditions, the light beam crosses the top of the T in an uninterrupted straight line, not striking the photocell positioned at a right angle below the beam.

When smoke is present, the light is scattered by smoke particles, and some of the light is directed down the vertical part of the T to strike the photocell. When sufficient light hits the cell, the current triggers the alarm.

 

Please note Ionisation alarms have received bad press recently due to their poor performance. PSL Fire & Safety don't offer for sale or advise the purchase of this type of alarm read more here: https://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=12052330



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Awesome piece of Equipment

Fast delivery, ordered in the afternoon, arrived the following day. Bought 5 smoke alarms. Small, tidy, connects all easily. Interconnectivity is a very good fearure; it is good to have all alarms connected so you can definitely be aware something's wrong. Awesome piece of equipment. A must have in your home!!

Flamefighter fire blanket

Hasn't arrived.....

PSL Fire Safety Burns Kit

So far so good

I’ve only had this alarm a few days. It arrived within a week of ordering online. It was easy to install and had clear written instructions.
Probably the best time to review it would be either after it warned of impending fire, (or didn’t), or a few days before the 10 year limit expires, rather than a few days after installation.

Super fast delivery

easy to install, small & unobtrusive. & delivery was fantastically fast especially as we are rural delivery