I want to remind everyone about my tests with the Prominent Gamma L Diaphram pump
Prominent Gamma/L 0232 Flow Rate Test (final results)
a) The specification is the MINIMUM flow at 2 bar -- NOT the maximum. (Sorry, Jed)
b) Prominent's low-outlet-pressure tables at 0.5 bar gives a factor of 1.2 greater flow than at the specified/faceplate 2 bar
c) My tests between 0.5 bar and 0.03 bar give a factor of 1.8
d) Combining b and c gives a multiplier of 2.2 over the specification
The earlier "yellow" diaphragm pump (I forget the make) ALSO has a disclaimer that it over-delivers at low outlet pressure
Levi et all measured the ACTUAL output. And, yes ... it IS greater than the specification.
But calibration beats specification every time.