EWS UFS8000, Operating Manual, Page: 48 / 130

UFS8000 Components 41
6.11. Transmembrane pressure
The transmembrane pressure can be determined in the controls.
This is determined according to the formula:
Transmembrane pressure = ((“Pressure Feed 2” + “Pressure Concentrate”) / 2) – “Permeate Pressure”.
It is possible to specify thresholds for the upper and lower limits, both with a programmable time delay.
It is also possible to specify whether the installation should be shut down in case of either positive or
negative crossing of the specified values.
If the thresholds are activated, it is possible to send an alarm message when, for instance, the upper
threshold is exceeded (this can be either through a relay or with an e-mail (only possible with
UFS8x1x-xxxx)).
The settings for the transmembrane pressure are visible only if the corresponding measurements are
connected to the controllers.
The transmembrane pressure is not on the inventory list, because it is not a direct measurement, but a
value calculated from other pressure measurements.
If monitoring for maximum transmembrane pressure is enabled, a backwash can be initiated when the
transmembrane pressure is above the programmed limit for the programmed time.
See also § 6.11.3 “Monitoring maximum transmembrane pressure” on page 42.
6.11.1. Properties transmembrane pressure
In this window you can set the unit in which the calculated value should be displayed. If a measured
pressure, which is used in the calculation, is displayed in another unit, then this measured value is
converted to the unit that is set for the transmembrane pressure.