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16
9
Annexes
9 Annexes
9.1 Water quality
In order to protect the water circuit of the ultracool units, the water to be
cooled must have specific physical/chemical properties so that it is not
aggressive. If this water is outside any of the limits listed in the table
below, it can seriously damage some of the materials of the ultracool
unit.
Parameter Limit
values
pH
7 – 8
Total Hardness (TH)
< 150 ppm
Conductivity
50 – 500
µ
S/cm
NH
3
<
2
ppm
Total iron ions (Fe
2+
and Fe
3+
)
< 0.2 ppm
Chloride (Cl
-
)
< 300 ppm
H
2
S <
0.05
ppm
Solid particles
< 150
µ
m
The Total Hardness is specified in ppm (mg/L) of Ca
2
CO
3
.
Please note that ultra pure waters like deionised water can also be
harmful for some of the materials of the ultracool units as they have a
conductivity below 50
µ
S/cm.
The product refrifluid supplied by ultrafilter includes in its composition an
anticorrosive, bactericide and antifreeze (until –7ºC / 19.4 ºF). It has the
following characteristics:
Parameter Limit
values
pH 7.5
Total Hardness (TH)
< 30 ppm
Conductivity
50
µ
S/cm
NH
3
0
ppm
Total iron ions (Fe
2+
and Fe
3+
)
< 0.2 ppm
Chloride (Cl
-
) <
1
ppm
H
2
S 0
ppm
Solid particles
< 50
µ
m
A concentration of ethylene-glycol higher than the 30% can seriously
damage the pump of the ultracool units.
ultrafilter will not accept any warranty for any damage caused by
water that is out of one or more of the above limits. Therefore, if
there is not a total security on the water quality we advise the use
of our product refrifluid. This fluid has been specially designed for
the protection of closed water circuits. Besides this ultrafilter offers
the possibility of doing a basic analysis of a water sample supplied
by the customer.
UC-140 I
NDI
GO
50/
60Hz 29.
01.
03
rev
. 0
