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T
9. How Pacific-AFT functions
Tap water of max. 6 bar pressure flows into the system.
In stand-by mode and during standstill, feedwater solenoid valve V2 is closed. This prevents
feedwater from flowing into the system when it is not in operation, and so protects the tank
against overflowing.
Semi-permeable membrane A-F2 retains dissolved salts in the feedwater within the specified
retention quota. Further to this, the molecular size of the pores of the membrane ensures Ø
99% retention of bacteria, pyrogens and particles.
Following reverse osmosis, the permeate flows past conductivity probe QIA 300 and through
the downstream purification stages such as deionization, adsorption and UV-disinfection into
the tank.
The retained feedwater constituents are flushed away with the concentrate flow.
The special conductivity probe QIA 301 (with temperature compensation) determines the
conductivity of the pure water (subsequent to the filter cartridge), that can be called to display in
the microprocessor control menu.
Pure water in the tank is pumped by pressure pump A-P2 through the pressure reducer V9 to
the user. This pressure reducer allows the outlet pressure to be adjusted and be read off from
pressure gauge PI 200. The level switch LIS 100 indicates the level in the tank.
.
Pressure hold valve V3 has been pre-adjusted at the factory. Changes to
the adjustment could result in damage to the reverse osmosis module!
Because of possible fluctuations in feedwater temperature and pressure,
the adjustment of the valve and the concentrate flow that it governs must
be checked on starting up and re-adjusted as necessary by Service at
regular intervals.
Version
Pacific AFT 3
Pacific AFT 7
Pacific AFT 12
Pacific AFT 20
Pacific AFT 40
Concentrate flow for Pacific AFT
Check and readjust all 6 months
Permeate
flow
[L/h]
3
7
12
20
40
Thermo Fisher Barnstead Pacific AFT
Concentrate
flow
≙
WCF-rate
[L/h]
[%]
40
40
13
60
17
60
25
110
26
Pure water system
17
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