Compatibility With Approved Fluids - Thermo Scientific ThermoFlex Manual De Instrucciones

Section 3
Compatibility with
Filtered Tap Water/Single Distilled Water
Filtered drinking water and single distilled water are good choices for use in
Approved
a recirculating chiller because the filtering/distilling process used removes
Fluids
microorganisms that could create biological fouling as well as harmful particulates
and excessive minerals that could cause harmful deposits and scaling.
Chlorine
Short term usage of tap water may not cause any adverse affects on the chiller
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, maintain the pH of the fluid between 6.5 and 7.5. Do not
add additional chlorine 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.
Deionized Water
Deionized water is water that has had its mineral ions removed using ion
exchange resins. The purpose of this process is to remove the ions that allow
electrical current to flow more easily through water. This helps to prevent
electrical leaks to ground through the recirculating fluid. Deionized water is
classified by the electrical resistance of the water, usually measured in
MΩ-cm, with pure water having a resistance of 18 MΩ-cm.
Deionized water is in an unbalanced state and will leach the missing ions from
the materials it comes in contact with. The aggressive nature of this leaching
can cause pitting on metal surfaces. Note that the deionizing process does
not remove microorganisms. Because of this, we recommend deionized water
only with applications that have it as a specified requirement.
In any case, only deionized water with a 1 - 3 MΩ-cm resistivity is approved
for use in Thermo Fisher Scientific recirculating chillers. For applications
requiring resistivity greater than 1 MΩ- cm please call and speak to an
applications engineer for additional information.
Recommended Biocides and Inhibitors
Thermo Fisher Scientific offers a biocide and inhibitor package Thermo 200
(NALCo) premixed with 5 gallons of water or as a kit to be added to water.
No other biocide or inhibitor is recommended for use in our chillers.
Biocides are corrosive and can cause irreversible eye damage and skin
burns. They are harmful if inhaled, swallowed or absorbed through the
skin. Refer to the manufacturer's most current SDS.
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ThermoFlex 3-13
Thermo Scientific