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3.3.2 Selection of fluids
Caution…
Be careful to select the right fluid for the right task. Using
other than the recommended fluids might cause damage to
the calibrator or degrade the performance.
AMETEK Denmark A/S recommends DOW CORNING 200(R) oil 10cSt
for sub zero temperatures to 158°C and DOW CORNING 200(R) oil
50cSt for ambient temperature to 250°C. Technical specifications for
the liquid baths has been produced using the fluids mentioned above.
For proper handling, use and disposal of fluid – read fluid product
information. When reading this information pay special attention to
details regarding fume point, flash point, boiling point and point of
decomposition.
When the fluid temperature approaches the fume point, it is necessary
to use proper ventilation. An exhaust hood is recommended. When
ventilation is applied take care not to expose the calibrator to
alternating draft, as it might influent the temperature stability. If
possible make the ventilation flow as constant as possible.
At low temperatures the viscosity of the fluid can constitute a problem.
When the viscosity becomes to low, the stirring magnet can’t provide
proper circulation in the well to maintain temperature uniformity.
Therefore it is essential to investigate the physical property of the fluid
before one is selected.
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