Apparatus and method for measuring polymer concentration

Claim 1

A VAPOR PRESSURE ANALYZER FOR A POLYMER SOLUTION COMPRISING, IN COMBINATION, A SAMPLE CONDUIT FROM A PROCESS STREAM, VAPOR PRESSURE MEASURING MEANS IN SAID SAMPLE CONDUIT, SAID MEASURING MEANS COMPRISING A CHAMBER, A PISTON DISPOSED THEREIN, A CYCLE TIMING MEANS, MECHANICAL MEANS CONNECTED TO SAID CYCLE TIMING MEANS FOR RAISING AND LOWERING SAID PISTON AS DESIRED, FIRST AND SECOND VALVE MEANS DISPOSED AT THE INLET AND OUTLET ENDS, RESPECTIVELY, OF SAID MEASURING MEANS, ELECTRICAL MEANS CONNECTING SAID TIMING MEANS TO SAID FIRST AND SECOND VALVE MEANS AND SAID MEASURING MEANS, SO THAT SAID PISTON IS ADAPTED TO RECIPROCATE ONLY DURING THE TIME THAT BOTH SAID VALVE MEANS ARE CLOSED, AND CONDUIT MEANS FOR PASSING A PNEUMATIC SIGNAL FROM SAID VAPOR PRESSURE MEASURING MEANS TO A RECORDING DEVICE.