The KOBOLD level switch model NSV is said to excel in low density bulk media and is easy to maintain. It detects level via vibration technology. The vibrations are induced into a stainless-steel fork by a piezoelectric crystal. When the media contacts the fork and dampens the vibration, it is detected and then transformed into a potential-free limit contact.
In addition to the standard model NSV-8200, the model NSV-8201 offers vertical installation via an extended neck pipe up to 118". The sensitivity can be set for maximum or minimum via a selector switch. The status of the switch is indicated by an LED light. For deeper insights and revelations, peruse the NSV datasheet and the NSV user manual.