System for calibrating pipe line flow meters

Claim 1

AN ARRANGEMENT FOR CALIBRATING FLOW METERS COMPRISING: A FIRST FLOW METER ADAPTED TO GENERATE IMPULSES IN ACCORDANCE WITH THE NUMBER OF UNITS OF FLUID PASSING THROUGH SAID FIRST FLOW METER AND MEASURED THEREBY, SAID FIRST FLOW METER BEING LOCATED AT A FIRST POSITION IN A FLOW OF FLUID; A SECOND FLOW METER ADAPTABLE TO DETERMINE THE NUMBER OF UNITS OF FLUID PASSING THROUGH SAID SECOND FLOW METER DURING A TEST PERIOD THE DURATION OF WHICH IS DEPENDENT UPON SUCH DETERMINATION, SAID SECOND FLOW METER BEING LOCATED AT A SECOND POSITION IN SAID FLOW OF FLUID; ADJUSTABLE MEANS FOR PRESETTING SAID SECOND FLOW METER TO GENERATE A CONTROL PULSE UPON SAID SECOND FLOW METER MEASURING A PRESET NUMBER OF UNITS OF FLUID PASSING THERETHROUGH, SAID CONTROL PULSE DEFINING ONE LIMIT OF SAID TEST PERIOD; SWITCHING MEANS CONNECTED TO SAID FIRST AND SECOND FLOW METERS AND ADAPTABLE TO BE RESPONSIVE TO AN IMPULSE GENERATED BY SAID FIRST FLOW METER TO ACTIVATE SAID SECOND FLOW METER, SUCH IMPULSE DEFINING THE OTHER LIMIT OF SAID TEST PERIOD; REGISTER MEANS RESPONSIVE TO SAID SWITCHING MEANS FOR RECORDING IMPULSES FROM SAID FIRST FLOW METER DURING SAID TEST PERIOD; AND MEANS COUPLED BETWEEN SAID SECOND FLOW METER AND SAID SWITCHING MEANS AND RESPONSIVE TO SAID CONTROL PULSE TO INTERRUPT SAID REGISTER MEANS.