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Photoelectric smoke detectors contain a light and a sensor at 90-degree angles to one another. Normally, the light from the light source shoots straight across the device and misses the sensor. When smoke enters the chamber, however, the smoke particles scatter the light and some amount of light hits the sensor. The sensor then sets off the alarm in the smoke detector. Photoelectric smoke detectors are better at sensing smoky fires, such as from a smoldering mattress. Technologies used include light emitting diodes (LEDs) and lasers (laser diodes). Spot laser technology is more sensitive than LED technology in detecting a fire. Products & Services
Smoke detectors are designed to sense the products of combustion. Common types include ionization chambers and photoelectric devices.
Fire protection services install, maintain and monitor safety equipment such as flame and smoke detectors, sprinkler systems, fire alarms and annunciators.
Opacity sensors, dust sensors and visibility sensors measure the amount of light transmitted through a sample.
Photoelectric sensors use emitters and receivers to detect the presence, absence, or distance of target objects.
Photoelectric safety sensors detect objects by using the properties of light sensitive elements.
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Topics of Interest
Ionization chamber smoke detectors use an ionization chamber and a source of ionizing radiation to detect smoke. This type of smoke detector is very common because it is inexpensive and good at...
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Smoke detectors may have audible alarms, visual alarms, (LEDs) or both. They may also have alarm output to a control unit. Smoke detectors without a built in alarm come with alarm contacts for output...
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Photodiodes bridge the gap between light and electronics. Many times precision applications such as CT scanners, blood analyzers, smoke detectors, position sensors, IR pyrometers and chromatographs...
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The technique of laser diffraction relies on the fact that particles passing through a laser beam scatter light at an angle that is inversely proportional to their size (small particles scatter light...
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In the remote village of Humla in the northwestern corner of Nepal even a simple thing like electric light in their homes can change a life. The current method of lighting is to burn sticks covered in...
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