An old management axiom is: “If you
can’t measure it, you can’t manage it.” This is still as true today
as it was when it was first uttered by wise men many years ago. But in the
old days, where compressed air was concerned, there may have been
some good excuses for ignoring compressed air flow measurement.
In these modern days of low cost electronic instrumentation, many new ways to measure flow have been developed. The most popular of these is the thermal mass flow meter.