LEDs on the Arduino can be programmed to indicate if the sensor is or isn’t immersed by the liquid to determine liquid levels. The devices are compact, allowing them to be deployed within constrained environments.
As this solution is of an optical rather than a mechanical nature, issues such as the build-up of deposits, jamming, or wear and tear are avoided, which is said to assure a long term operational life span.
The liquid level switch can be supplied by SST in a robust housing with either a Polysulfone or Trogamid construction. The complete solution operates in temperatures ranging from -25 to 80°C.