Sapcon instruments manufactures conductivity level limit switches [series levtester slw] that are successfully used in processing plants for conductive liquids of conductivity not less than 25u siemens in food, power, chemicals, sugar, detergents, steel, minerals, textiles, etc. Some of the salient features of the level limit switches include: no moving parts, therefore free from maintenance; no special cable required for signal transmission, therefore economical to install; long cable connections permissible between probes and evaluation units; ac on probes for prevention of electrolytic deterioration of electrodes; low voltage on probes for operational safety; and variety of control functions and installation systems available. The conductivity level limit switches are used for switching off pumps when the tank is full to avoid overflow. They are used to maintaining a constant level to avoid material wastage. The conductivity level limit switches are used to further switching of pumps when running dry and indicating an empty tank to avoid wear and tear and production stoppage.
