Thermo Scientific Barnstead
Pacific TII
Pure water System
15
8.3 System description
A-F1 Prefilter 5 µm +
and
hardness
stabilizer
Prevents particles > 5µm from entering the system.
Serves to stabilize water hardness.
A-F1.1 Prefilter 1 µm
(option, only if
necessary)
Prevents particles > 1µm from entering the system.
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 high purity 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.
V6 Check valve:
Enables the required outlet pressure to be attained during
recirculation.
V7 Recirculating solenoid
valve:
Opens for recirculation.
A-F3 Special Ion exchanger
/Adsorber filter cartridge:
Removes inorganic ions and traces of dissolved organic
compounds.
QIA 301 High purity water
conductivity
cell:
Device for measuring the conductivity of the water
subsequent to the filter cartridge, as a parameter that
indicates the quality of the water.
TIA 500 Temperature sensor Measures the temperature for temperature compensation.
A-UV1 UV-Disinfection
(only TII UV)
Destroys bacteria.
A-B1 Tank for high purity water
For storage of the high purity water produced.
