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For example, photoelectric sensors do better with smoldering fires that grow slowly and produce a lot of smoke while ionization alarms are better for detecting fast growing, flaming fires.
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What am I paying for.
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Now that you’re familiar with that, it’s time to have a look at some of the best models that the market has to offer.
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Not all protocols are the same, with some supporting more devices or using less power.
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Photo Electric or Optical Sensors They are triggered by smoke disturbing an existing beam of light inside the detector. When smoke is not present, the beam from a light source inside the device travels in a straight line to a detector, but when smoke particles enter, some of the light is
scattered and triggers the electrical circuit that sounds the alarm. 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.
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In an example, the interior surface of the front cover plate 708 is entirely covered by the ink except the button opening 710 exposing the button top 706 and the substantially transparent area 712 covering the lens assembly 704.
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