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Conductive Level Switches

Conductive level indicators use the conductivity of the product when in contact with metal rods to cause the switching of relays to signal its presence. 
When liquid inside a tank or well wets all three probes, the relays are actioned and only deactivated when the level of liquid descends again, uncovering the lower probe. The probes can be supplied with any desired length.  
They can be used to keep the level of conducting liquids or solids within predetermined limits, to protect pumps in continuous and dynamic use and to trigger alarms to protect against overflow, emptying or dry running.  
The conductive sensors can be installed either vertically or horizontally, as long as, in order to prevent false triggering, the incoming liquid does not run directly up against their electrodes.
 
You can find more level switch solutions here.