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Section 3 Installation
Chlorine
Short term usage of tap water may not cause any adverse affects on the
circulator or your application, but in the long term problems may arise. To
help alleviate these problems Thermo Fisher Scientific recommends the use
of chlorine.
The duration of time that chlorine remains in solution depends on factors
such as water temperature, pH and availability of direct sunlight. We
recommend maintaining chlorine levels at proper levels using chlorine test
strips, generally 1 to 5 ppm is adequate.
For best results, the pH of the fluid should be maintained between 6.5 and
7.5. Additional chlorine should not be added without first determining the
concentration ratio that already exists in the fluid supply. Corrosion and
degradation of the circulation components can result from concentration
ratios that are too high. Contact our customer support for additional
information.
5°C to 95°C — Distilled Water or Deionized Water (up to 3 MΩ-cm)
Normal tap water leads to calcareous deposits necessitating frequent
circulator decalcification, see table page 3-14.
Calcium tends to deposit itself on the heating element. The heating capacity
is reduced and service life shortened.
-30°C to 80°C — Water with Glycol
Below 5°C water has to be mixed with a glycol. The amount of glycol added
should cover a temperature range 5°C lower than the operating temperature
of the particular application. This will prevent the water/glycol from gelling
(freezing) near the evaporating coil.
Excess glycol deteriorates the temperature accuracy due to its high viscosity.
-40°C to 200°C — SIL180
SIL180 is suitable for covering nearly the entire range with just one liquid,
especially when used with the refrigerated baths.
Unfortunately SIL180 has a wetting tendency necessitating the occasional
cleaning of the reservoir cover.
other temperatures:
Thermo Fisher Scientific offers a range of heat transfer fluids for these
temperature control applications.
SYNTH 60 and SYNTH 260:
Synthetic thermal liquid with a medium life span (several months) and little
smell annoyance.
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