Liquid level controller
First Claim
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1. A SYSTEM FOR OPENING AND CLOSING THE SWITCH OF A RELAY IN RESPONSE TO VARIATIONS BETWEEN A PREDETERMINED UPPER LEVEL AND A PREDETERMINED LOWER LEVEL OF AN ELECTROLYTE TEMPORARILY STORED IN A VESSEL, COMPRISING:
- A FIRST CONTACT SUPPORTED IN THE VESSEL AT SAID PREDETERMINED UPPER LEVEL AND CONNECTED TO ONE END OF THE COIL OF THE RELAY, A PNP-TYPE TRANSISTOR HAVING ITS COLLECTOR CONNECTED TO THE OPPOSITE END OF SAID RELAY COIL, MEANS FOR SUPPLYING A POSITIVE D.C. CURRENT TO THE EMITTER OF SAID TRANSISTOR, A SECOND CONTACT SUPPORTED IN THE VESSEL AT SAID PREDETERMINED LOWER LEVEL AND CONNECTED TO THE BASE OF SAID TRANSISTOR FOR PLACING A NEGATIVE BIAS ON SAID BASE AND RENDERING SAID TRANSISTOR CONDUCTIVE WHEN BOTH OF SAID FIRST AND SECOND CONTACTS ARE IMMERSED IN THE ELECTROLYTE TO IN TURN CLOSE SAID RELAY, A THIRD CON-
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1 Claim
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1. A SYSTEM FOR OPENING AND CLOSING THE SWITCH OF A RELAY IN RESPONSE TO VARIATIONS BETWEEN A PREDETERMINED UPPER LEVEL AND A PREDETERMINED LOWER LEVEL OF AN ELECTROLYTE TEMPORARILY STORED IN A VESSEL, COMPRISING:
- A FIRST CONTACT SUPPORTED IN THE VESSEL AT SAID PREDETERMINED UPPER LEVEL AND CONNECTED TO ONE END OF THE COIL OF THE RELAY, A PNP-TYPE TRANSISTOR HAVING ITS COLLECTOR CONNECTED TO THE OPPOSITE END OF SAID RELAY COIL, MEANS FOR SUPPLYING A POSITIVE D.C. CURRENT TO THE EMITTER OF SAID TRANSISTOR, A SECOND CONTACT SUPPORTED IN THE VESSEL AT SAID PREDETERMINED LOWER LEVEL AND CONNECTED TO THE BASE OF SAID TRANSISTOR FOR PLACING A NEGATIVE BIAS ON SAID BASE AND RENDERING SAID TRANSISTOR CONDUCTIVE WHEN BOTH OF SAID FIRST AND SECOND CONTACTS ARE IMMERSED IN THE ELECTROLYTE TO IN TURN CLOSE SAID RELAY, A THIRD CON-
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Current AssigneeCarl O. Berglund, Roy R. Thompson
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Original AssigneeCarl O. Berglund, Roy R. Thompson
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InventorsBerglund, Carl O., Thompson, Roy R.
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Application NumberUS04/068,443Time in Patent Office1,265 DaysField of SearchUS Class Current361/178CPC Class CodesG01F 23/241 for discrete levelsG05D 9/12 characterised by the use of...Y10T 137/7306 Electrical characteristic s...
