Due to their design and the materials used, KOBOLD level meters of model NPF with diaphragm satisfy the tough service demands in the chemical and petrochemical industry. They are used for level measuring of low-viscosity, nonsticking media in open, unpressurized vessels. The specific weight of the medium should be taken into account. The fixed annular diaphragm is quite insensitive to vibrations. Diaphragm pressure gauges have a relatively high actuating force. Their stainless steel construction render the instruments resistant to aggressive environmental conditions.