repligen.com IF.UG.028 R1
The Scale Settings screen appears.
1. Touch the BLUE field to configure the Maximum Value (0 to XXXX Kg) for the WE-01 Scale
Range setpoint.
2. Touch the Main button to return the Main Screen.
12.2 Normalized Water Permeability
NWP(Initial)
Initial Clean Membrane Water Permeability is defined to be the clean DI water filtrate flux rate over
a given range of transmembrane pressure (typical 5-15 PSIG for UF membranes or 2-5 PSIG for MF
membranes) for a given membrane area were the flow is normalized based upon temperature and is
expressed as LMH / PSIG @ 20C. This information is used to determine productivity / impact to
productivity as well as effectiveness of cleaning solution if membrane is going to be re-used.
NWP (Post Cleaning)
Membrane Recovery is defined to be the percent ratio of the initial DI water NWP (normalized water
permeability) after cleaning in relationship to the primary NWP initial which was measured before
the membrane contacted any process fluid.
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