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9 billion. ADT Corporation was
founded in 1874 and today is one of America’s leading alarm and security monitoring companies. Based in Boca Ranton, Florida, the company operates in 35 countries around the world, supplying alarms, monitoring equipment and peace of mind to homes and small businesses. In South Africa, ADT provides armed response teams and around the clock surveillance. Originally known as American District Telegraph, ADT started out as a telegraph delivery business. Then
from 1910, under new leadership from ATandT, it started to switch focus to other fields such as fire and intruder alarms. In 2011 ADT boasted an estimated 6. 4 million clients and yearly turnover of $3. 1 billion. And in 2012 it split from Swiss parent company Tyco International and commenced trading on the New York Stock Exchange as an independent company. Established in Helsingborg, Sweden in 1934, Securitas AB is a worldwide security company with head offices in Stockholm.
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4. Air Sampling Detectors These have sensors that are capable of detecting microscopic smoke particles in the air. They actually draw air into the detector and passes it into minute pipes that lead to a laser optical
device that has the capability to detect minute particles of combustion. When the laser detects the unusual content, it triggers the alarm. Combination Type Detectors It use both ionization and optical sensors, as mandated by some states. Ionization detectors tend to react slower, and may not warn people inside the house or commercial buildings adequately enough to be able to make it to the exit. So fire departments and legislative bodies recommended installing photo electric smoke detectors, or combination type detectors. The other feature that one may consider in a smoke detector is its gas detection capability. Incorporated in
many of the newer models are carbon monoxide and carbon dioxide sensors that trigger an alarm when there is a high level of these gases present in the air. As stand alone detectors, they may be useful as alarms against dangerous gases, but may not be able to detect smoke out of ordinary fires early enough. You’ll see that these wouldn’t be good fire prevention devices if that’s what you were looking for.