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Can we see the infrared beam? |
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Infrared beam is invisible to the naked eyes. However, the infrared beam may be vaguely seen with a high-sensitivity infrared scope if it is blocked by an object. In any case seeing the infrared beam is extremely difficult, so the intruders are not likely to realize the presence of the detectors. |
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What happens if the wire is cut? |
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Low electric current is constantly supplied to the detector. If the wire is cut, the electric supply stops and the tamper circuit is activated that results in triggering an alarm. |
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What happens if the infrared beam is blocked by a glass? |
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Infrared beam passes through a glass so no alarm is generated. For stable operation, please do not place a glass between transmitter and receiver. |
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Is there any battery-operated photoelectric detector? |
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No, the electricity must be supplied from power. Photoelectric detectors consume more electric currents compared to passive infrared detectors. |
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What does AGC stand for? |
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AGC (Automatic gain control) is an adaptive system found in many electronic devices. The average output signal level is fed back to adjust the gain to an appropriate level for a range of input signal levels. For example, without AGC the sound emitted from an alarm would vary to an extreme extent from a weak to a strong signal; the AGC effectively reduces the volume if the signal is strong and raises it when it is weaker. |
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What is the operating principle of photoelectric senor? |
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A photoelectric sensor, or photoeye, is a device used to detect the presence of an object by using a light transmitter, often infrared, and a photoelectric receiver. There are three functional types. An opposed arrangement consists of a receiver located within the line-of-sight of the transmitter. In this mode, an object is detected when the light beam is blocked from getting to the receiver from the transmitter. A retroreflective arrangement places the transmitter and receiver at the same location and uses a reflector to bounce the light beam back from the transmitter to the receiver. An object is sensed when the beam is interrupted and fails to reach the receiver. A proximity-sensing arrangement is one in which the transmitted radiation must reflect off of the object in order to reach the receiver. In this mode, an object is detected when the receiver sees the transmitted source rather than when it fails to see it. Photoeyes are used extensively in industrial manufacturing. |
