Patent ID: 8485792

Claim:
A method comprising the steps of: providing a pump having a first diaphragm assembly disposed in a first diaphragm chamber, the first diaphragm assembly having a first end-of-stroke position (DP 1 L ) and a second end-of-stroke position (DP 2 L ), a first current position(X CL ) and a first turndown position (X SL ); defining a first minimum velocity (V MINL ) and a first termination velocity (V TERML ); providing an air inlet valve operatively connected to the first diaphragm chamber; opening the air inlet valve; filling a portion of the first diaphragm chamber with a compressed air; decreasing air flow through the air inlet valve when the first current position (X CL ) meets the first turndown position (X SL ); monitoring a first current velocity (V CL ) of the first diaphragm assembly while it is translated toward the second end-of-stroke position (DP 2 L ); redefining the first turndown position (X SL ) if the first current velocity (V CL ) at the second end-of-stroke position (DP 2 L ) is one of: less than the first minimum velocity(V MINL ); or greater than the first termination velocity (V TERML ); and, translating the first diaphragm assembly toward the first end-of-stroke position (DP 1 L ).