The level control switch NK21 is suited for the level detection in containers with electrically conductive media. It operates according to the principle of conductive measuring and is suited for numerous measurement tasks. The device has three measuring probes (electrodes) and a common probe (com) that can also be connected to the container if required. The probe lengths can be optionally shortened and therefore adapted to the process. At the electrodes there is a low AC voltage. If these are moistened by the conductive medium, a current starts to flow that is analyzed by the integrated electronics. The threshold limit (resistance range of the medium) can be adjusted in 10 steps by the user. Three PhotoMOS contacts are available as output signal the switching function of which (see wiring diagram) can be set at the plant. The contacts are electrically isolated from the measuring circuit. The switching status is indicated by light emitting diodes. Another light emitting diode indicates the operating status of the device.
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