Flow tester For Test
ET97W RFO

The historic problem of flow test systems, especially for high flows, deals with keeping the
reference pressure regulated according to the wanted one while the flow changes.

The flow measurement depends directly (but not linearly) on the pressure and because of charge loss, we have to consider as pressure value the pressure at the entrance of the piece and not the one generated inside the piece.
In the past almost all leak and flow test producers tried to solve this by separating the connecting tubes to the piece between flow and pressure measurement in order to obtain at least a real pressure datum (even if not regulated) and by correcting through the software the eventual charge loss of connection tubes through correlation calculations.

The limits of this method are (especially with high charge loss -> 5 Lt/min) in the non linearity of flow/pressure.
Moreover in deforming pieces, where the pressure value modifies the matched flow value (packaging, filters, valves … and every piece which is not really rigid) this correlation changes drastically the wanted measurement value.
Through new proportional techniques about electronics and algorithm able to take a picture of the flow value (only at wanted values of pressure), the RFO techniques is a warranty of doing tests at the flow and pressure values you set.

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