General description Capacitance Level Switches & Transmitters Jerguson RF Capacitance level switches are designed for point level alarm or control of conductive and non-conductive liquids, granular materials, foams, pastes, slurries and interface applications. They may be used with any Jerguson insulated or driven shield level sensing probe. When a driven shield probe is used, special shield driven circuitry ignores the effect of conductive material build-up on the level probe surface. Other features include adjustable relay time delay to prevent chattering in turbulent applications and field-selectable low or high level failsafe modes of operation.