公开(公告)号：US3574554A

公开(公告)日：1971-04-13

申请号：US3574554D

申请日：1969-06-02

Applicant: BECKMAN INSTRUMENTS INC

Inventor： BERRY EDWARD A ,  BARTER LE ROY D

IPC: G01N31/16 ,  G05D21/02 ,  G01N31/18

CPC classification number: G01N31/16 ,  G05D21/02

Abstract: THERE IS DISCLOSED A DISPENSING APPARATUS HAVING A CONTROLLED DISPENSER MECHANISM FOR ADDING A FIRST SUBSTANCE TO A SECOND SUBSTANCE THEREBY FORMING A MIXTURE AT A RATE DETERMINED BY A PRESET MIXTURE END POINT ADJUSTMENT. A MIXTURE SENSOR IS CONNECTED TO A COMPARATOR TO PRODUCE A COMPARATOR OUTPUT SIGNAL WHEN THE SENSOR SIGNAL EXCEEDS A PRESET MIXTURE END POINT LEVEL. THE COMPARATOR OUTPUT SIGNAL IS CONNECTED TO ACTIVATE A SWITCHING DEVICE WHEREBY THE DISPENSER MECHANISM IS DISCONNECTED FROM AN ACTIVATING SOURCE OF ENERGY AND CONNECTED TO AN ENERGY DISCHARGE DEVICE. AN ENERGY STORAGE DEVICE IS ATTACHED TO THE DISPENSER MECHANISM AND BY THE ACTIVATED SWITCH DEVICE IS CONNECTED TO THE ENERGY DISCHARGE DEVICE TO PROVIDE A DECAYING SOURCE OF ENERGY TO THE DISPENSER MECHANISM THEREBY SLOWING THE DISPENSING RATE. IN RESPONSE TO THE SENSOR SIGNAL DROPPING BELOW THE MIXTURE END POINT, THE SOURCE OF ENERGY IS AGAIN CONNECTED BY THE SWITCH DEVICE TO THE DISPENSER MECHANISM. A TIMED DISCONNECT IS CONNECTED TO THE COMPARATOR OUTPUT AND IN RESPONSE TO THE SENSOR SIGNAL EXCEEDING THE MIXTURE END POINT LEVEL FOR A PRESET END POINT INTERVAL DISCONNECTS THE DISPENSER MECHANISM FROM THE SWITCH DEVICE TO END THE DISPENSING ACTION UNTIL RESET FOR THE NEXT CYCLE.