July 29, 2014
Kobold’s NWS level switch works on the vibrating tuning-fork principle. A piezoelectric crystal is matched to the frequency of a tuning fork in air, and used to set the fork vibrating. When the fork becomes immersed in a liquid, its resonant frequency changes. The piezoelectric crystal is then no longer matched to the tuning fork. This causes the vibration to stop. The NWS’s internal electronics detects this change and signals an alarm condition. The NWS is compatible with non-coating and some coating media whose viscosities can range up to 5000 cSt.