After a visit to the fodder and grain factory Johan Hansson AB in Uppsala. we were able to quickly ascertain that the level switches they have installed are probably 40-50 years old. Even so, the majority of them are still in use and fully functional. These level switches are installed in a number of places in the facility's conveyors as an overfill protection. This means that you can safely and securly conduct the business without major interruptions or danger.