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Fiber-optic cables for measuring liquid levels detect the level of almost any liquid - no matter if the liquid is clear or opaque. Detecting fill levels using fiber-optics is based on the differing refractive indices of air and liquids. There is a large difference between the refractive index of plastic and air when the tip of the sensor is in the air. The light beam is completely reflected and returned to the receiver. The difference in the refractive index of plastic and liquid is, however, considerably smaller when the tip of the sensor is in the liquid. The majority of the light beam is then absorbed by the liquid and only a very small amount of light returns to the receiver. The level of the liquid is then determined.
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Portlet 1
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LL3-DF02 fiber-optic cable
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Detection of liquid levels
- Measures almost all liquids
- Precise and flexible measurement, particularly in small containers, such as beverages bottles
- Teach-in via adjustment button or external input
- Binary outputs
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Portlet 2
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WLL190T-2
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- Simple operation startup and product change thanks to external teach input
- Easily monitor target and actual values thanks to 2 x 4-place digital display
- Switching reliability with fast workflows thanks to short response times
- In bus operation reduces wiring work
- APC for long-term, stable detection
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