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Kotron® Model 811 RF Point Level Switch Model 811 offers the user great flexibility, used either as a single alarm relay with narrow differential; or, for control purposes with an adjustable differential. The Model 811 provides reliable operation for a broad range of applications. Literature Select Your LanguageDeutschFrançaisItalianoUK EnglishUS English Additional Tools:            Measurement Principle: As media rises and falls in the tank, the amount of capacitance developed between the probe and the ground reference rises and falls. This change in capacitance is compared to the adjustable set point and changes the state of a relay when they are equal. Features: Useable for both narrow and wide differential Intrinsically safe probe circuitry 10 amp DPDT relay Guard circuitry rejects build-up on the probe Time delay Applications: Clean or dirty liquids Viscous liquids Light slurries Corrosive liquids High temperature/pressure liquids Interface Options: Input power Integral or remote location FM or CSA approvals Probe selection