ELGA PURELAB UHQ II, Руководство по обслуживанию

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ELGA PURELAB UHQ II & PS Service Manual
PURELAB UHQ II & PS service issue 2 02/07
9
3.5 Purified water specification
Make up rate 4 l/hr @ 25
°
C, 4 bar (UHQ II)
1 l/min @ 2 bar (UHQ PS)
Dispense rate up to 0.75 l/min from dispense tap
3.6 Purity from dispense tap
Inorganic 18.2 M
Ω
-cm @ 25
°
C
TOC <20ppb
Bacteria <1 CFU/ml (subject to correct operating and maintenance
procedures)
Particles 0.05
µ
m
pH effectively neutral
3.7 Cartridge replacement frequencies
UHQ1 pre treatment cartridge ) 4 months (max service life).
UHQ2 DI cartridge ) see note.
UHQ7 Ultra-microfilter 4 months (max service life).
UHQ6 UV lamp (max service life).
UHQ5 RO cartridge (UHQ II only) 2 – 3 years (typical)
UHQ4 composite vent filter 4 months (max service life).
NOTE: The UHQ1 and UHQ2 must always be changed at the same time and are supplied
as a “Pack A”. The Pack A consists 2 UHQ1’s and 2 x UHQ2’s. The capacity of a UHQ1 DI
cartridge should be typically 4,100 litres of Ultra Pure water (15 – 18 M
Ω
-cm) divided by
the feed water conductivity in
µ
S/cm. HOWEVER an RO does not remove dissolved
carbon dioxide (CO
2
) into account. Every 1ppm of CO
2
is equivalent to 2.33
µ
S/cm.
For example if a UHQ is fed with RO permeate with a quality of 20
µ
S/cm one would
expect a capacity of 205 litres of Ultra pure water. If however the feed water contains 25
ppm of CO2, the actual challenge on the UHQ1 is 20 + (25 x 2.33) = 78
µ
S/cm total ionic
loading.
This means the actual capacity of the UHQ1 will be reduced to 52 litres (not 205
litres)