Fluid-operated error detecting and indicating circuit

Claim 1

A FLUID-OPERATED ERROR-DETECTING AND INDICATING CIRCUIT COMPRISING: (A) SENSOR MEANS FOR GENERATING A SENSOR FLUID WAVE OF A VARIABLE CHARACTERISTIC REPRESENTING THE MONITORED VALUE OF A SELECTED CONDITION, VALUE OF A SELECTED CONDITION, (B) REFERENCE MEANS FOR GENERATING A REFERENCE FLUID VALUE OF THE SELECTED CONDITION, (C) DETECTOR MEANS COMMUNICATING WITH SAID SENSOR AND SAID REFERENCE MEAN AND RECEIVING THE SENSOR AND REFERENCE FLUID WAVES FOR GENERATING IN RESPONSE THERETO AN ERROR FLUID WAVES FOR GENERATING IN RESPONSE ISTIC REPRESENTING THE DIFFERENCE BETWEEN THE DESIRED AND THE MONITORED VALUES OF THE SELECTED CONDITION, (D) FIRST FLUID CONTROL MEANS FOR ESTABLISHING A MEASURING SAID REFERENCE MEANS FOR ESTABLISHING A MEASURING INTERVAL OF PERMISSIBLE ERROR LIMITS, SAID FIRST FLUID CONTROL MEANS RESPONDING TO THE REFERENCE FLUID WAVE TO DETERMINE THE MEASURING INTERVAL AND PRODUCING AN OUTPUT FLUID PULSE UPON TERMINATION OF THE MEASURING INTERVAL, (E) SECOND FLUID CONTROL MEANS IN COMMUNICATION WITH SAID DETECTOR MEANS FOR ESTABLISHING THE PERMISSIBLE ERROR LIMITS, SAID SECOND FLUID CONTROL MEANS RESPONDING TO THE ERROR FLUID WAVE TO DETERMINE THE ERROR MAGNITUDE OCCURRING IN EACH MEASURING INTERVAL AND PRODUCING AN OUTPUT FLUID PULSE WHEN THE ERROR MAGNITUDE EXCEESS THE PERMISSIBLE ERROR LIMITS IN A GIVEN MEASURING INTERVAL, (F) INTERVAL RESET FLUID CONTROL MEANS COMMUNICATING WITH BOTH SAIDFIRST AND SAID SECOND FLUID CONTROL MEANS AND RESPONDING TO AN OUTPUT FLUID PULSE EITHER OF SAID FIRST AND SAID SECOND FLUID CONTROL MEANS TO GENERATE A RESET FLUID PULSE, THE RESET FLUID PULSE INITIATING OPERATION OF SAID FIRST AND SECOND FLUID CONTROL MEANS IN A SUBSEQUENT MEASURING INTERVAL, AND (G) STATUS INDICATING FLUID CONTROL MEANS RESPONSIVE TO AN OUTPUT FLUID PULSE FROM SAID FIRST FLUID CONTROL MEANS FOR GENERATING A FIRST OUTPUT FLUID WAVE REPRESENTING THE ERROR STATUS AS WITHIN THE PERMISSIBLE ERROR LIMITS AND RESPONSIVE TO THE OUTPUT FLUID PULSE FROM SAID SECOND FLUID CONTROL MEANS FOR GENERATING A SECOND OUTPUT FLUID WAVE REPRESENTING THE ERROR STATUS AS WITHOUT THE PERMISSIBLE ERROR LIMITS.