TKA LabTower EDI, Руководство по эксплуатации

Страница: 15 / 51

LabTower EDI
Ultrapure water system
15
7.1 How the system functions
When the ON/OFF key is pressed, the system starts running either in the operating mode or in
the stand-by mode, according to the float switch.
The feed water flows with a maximum pressure of 6 bar into the system.
Pressure switch PS 201 checks the available inlet feedwater pressure and switches the system
off should this be below the minimum pressure.
Feedwater solenoid valve (V1) is closed when the system is at stand-by or at a standstill. This
prevents feedwater from flowing into the system when it is not in operation and so protects
storage tank (B1) from overflowing.
Semi-permeable membrane (F2) retains all salts dissolved in the water up to the specified
retention quota. The molecular size of the membrane pores is so small, that 99% of bacteria,
pyrogens and particles are also removed from the feedwater.
The pure water flows now over the pure water measuring cell (QIA300) by the electrode
ionization into the storage tank. The conductivity measuring cell (QIA301) measures the
conductivity of the product water.
Recirculation pump (P2) pumps the ultrapure water from storage tank (B1) through the special
conductivity measuring cell (QIA301) with temperature compensation (TIA500) to dispensing
valve (V7) as well as through filter (F6) to a user. The conductivity measuring probe determines
the conductivity and the temperature of the ultrapure water subsequent to UV-photooxidation
*
(UV1) and ion exchanger (F3). The measured values can be called in the microprocessor
system control.
Recirculation pump (P2) runs every 15 minutes to recirculate the water that is in storage tank (B1)
through the system. The time interval begins 10 minutes after switch-on to avoid dry-running of
recirculation pump (P2).
* Option
Valve (V2) has been pre-adjusted at the factory. A change in the adjustment
of this valve could result in damage to the reverse osmosis module!
Because of fluctuations in the feedwater temperature and pressure, the
adjustment of the pressure hold valve and the concentrate flow that it
governs must be checked and re-adjusted if necessary, on putting the
system into operation and at regular intervals thereafter.
The measured values must be recorded in the maintenance record.
Concentrate flow for LabTower EDI
Check and adjust at least 1x monthly
System Permeate-
flow
[l/h)
Concentrate-
flow RO
[l/h]
adjustable
up to
[%]
Concentrate-
flow EDI
[l/h]
LabTower EDI 15 20 min. 60 40 2
LabTower EDI 30 40 min. 60 40 4
LabTower EDI 45 50 min. 60 40 5