The Optical level sensor consists of an infrared LED and a receiver. Light from the LED is directed into a prism which forms the tip of the sensor. When there is no liquid, light from the LED is reflected within the prism to the receiver. When the liquid level rises and the prism is in water, the light is refracted out into the liquid and the amount of light received by the receiver is dropped. This drop indicates that the liquid has reached the tip of the sensor.
Advantages:
1) Compact
2) Low cost
Disadvantages:
1) Fixed level detection.
Applications:
1) Level sensing
2) Leak detection
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