Profile: Kobold Instruments Ltd. provides instruments for monitoring, measuring & regulating the physical quantities of flow through, pressure, level and temperature. Our plastic flow meters/flow switches operate on the basis of the well known variable area principle. The medium flows upward through a conically widening plastic measuring tube. The float is lifted by the flowing medium and indicates the instantaneous flow rate on the scale attached to the flow meter. The KSK series is all plastic with bodies made of nylon polysulfone or PVDF to handle aggressive media. For the control of flow setpoints, a bistable switch can be provided for the instrument. Reed contacts or transistor switches are available and can be used to monitor and alarm on an upset flow condition. The transistor switch has an LED on the contact housing to indicate switching status. The NVI series vibrating level switch is a choice for monitoring the level of powdered, granular or pelletized solids. Its unique design utilizes the resonance principle with a single smooth probe which will not foul when used with solids which tend to cake or coat. The insertion probe is made of 316 stainless steel to resist corrosion. It has no moving parts so high reliability and a long service life are assured. The NVI has an adjustable sensitivity and can be used with solid materials down to a density of 3.1 lb/ft3.