T
Thermo Fisher Barnstead
Pacific AFT
Pure water system
15
8. Flow chart
A-F1 Prefilter 5 µm
and
hardness
stabilizer
Prevents particles > 5µm from entering the system.
Serves to stabilize water hardness.
V1 3-Way ball tap:
For switching from normal operation to emergency supply.
V2 Feedwater solenoid valve: Is closed when the system is at stand-by or at a standstill. It
prevents water from flowing in when the system is not in
use.
A-P1 Pressure boosting pump: Raises the inlet pressure up to the required operating
pressure.
A-F2 Reverse osmosis
module:
Contains a semi-permeable, thin film composite spiral-
wound membrane.
V3 Pressure hold valve:
Serves for adjustment of the operating pressure and the
water conversion factor (see section 8).
V4 Rinsing solenoid valve:
Opens when the membrane is to be cleaned, prior to and
after production of pure water and at least every 12 hours.
QIA 300 Permeate
conductivity
cell:
Measurement device for determining the conductivity of the
water subsequent to reverse osmosis, as parameter for
permeating water quality.
V5 Check valve:
Prevents water backflow into the reverse osmosis module
when the system is operated in emergency supply mode.
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