WEBTEC 1 Série Manuel D'utilisation page 17

To set the reference point for efficiency testing on screen3, you must first reduce the
system pressure as much as you can and set your pump to the speed you wish to test at.
Press
and the current conditions will be stored as the reference (with the
assumption that 100% efficiency is achieved at this point). The flow
and pressure values for the reference point will be indicated on the
bottom line of the display and the third line of the display will now
show the calculated efficiency. The reference point will be lost if you
press the toggle screen button.
As you now load the system by increasing the pressure, any reduction in flow rate will
reduce the efficiency value displayed on line 3 and will automatically update.
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