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    [name] => beamDetectorInfo
    [title] => More information about infrared beam detectors
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<h2>What is a Beam Detector?</h2>
<p>A beam detector is used to provide "wide area" smoke detection and is usually used in situations where it it is either not practical or not cost effective to use traditional point detectors.</p>
<p>A beam of light (usually infrared) is projected accross the area to be protected, any smoke entering the beam will result in a drop in beam power. When the power falls to a predetermined level, the detector will signal an alarm.</p>
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<td width="30%"><img title="An IR beam transmitted and received over an open area" src="../templates_core/templates/guides/images/beam-detectors/beam-detectors-description1.jpg" alt="An IR beam transmitted and received over an open area" /></td>
<td width="70%"><img title="Reduction in beam power due to smoke" src="../templates_core/templates/guides/images/beam-detectors/beam-detectors-description2.jpg" alt="Reduction in beam power due to smoke" /></td>
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<td>Fig 1: An IR beam transmitted and received over an open area</td>
<td>Fig 2: Reduction in beam power due to smoke</td>
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<h2>Types of beam detectors</h2>
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<td valign="top"><strong>End to End</strong><br /><br />Consists of a transmitter and receiver, these are positioned at opposite ends of the area to be protected. The transmitter emits a signal, which is detected and monitored by the receiver.</td>
<td valign="top"><strong>Reflected</strong><br /><br />The Transmitter and receiver are effectivelly in the same unit (transciever). The transmitter emits a signal which is reflected back to the transmitter using a reflector positioned at the oposite end of the area to be protecetd.</td>
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<td><img title="End to End beam detectors" src="../templates_core/templates/guides/images/beam-detectors/beam-detectors-end-to-end.jpg" alt="End to End beam detectors" /></td>
<td><img title="Reflected Beam Detectors" src="../templates_core/templates/guides/images/beam-detectors/beam-detectors-reflected.jpg" alt="Reflected Beam Detectors" /></td>
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<td>Fig 3: End to End beam detectors</td>
<td>Fig 4: Reflected Beam Detectors</td>
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</div>
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    [metaDescription] => Information about beam detectors, how they work and the different types.
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