Which type of level sensor to use?

Which type of level sensor to use?
We are often asked which level sensors shall be used for a certain application.

These sensors are available:
- Optical sensor (horizontally mounted)
- Floater (vertical mounted)

ProfiLux offers these options:
- Auto Top Off with one sensor
- Auto Top Off with two sensors (min and max)
- Automatic Water Change
- Leakage detection

Optical sensors and Floaters can generally be used for all applications, though the optical sensors are a bit more non-sensitive concerning soiling.
Optical sensors react on liquids at the tip point and Floaters react if they get below the water surface.