Instrument Technician-E&I - Photoelectric Smoke Detector The Photoelectric Smoke Detector consists of a transmitter LED and a receiver photo-diode. These two devices are installed at a specific angle to one another and
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Rue Mohr on Twitter: "An ionization detector will trip if it senses the waft of heat from your oven when you open it. A photoelectric will trip if its exposed to the
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