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Portable Calibration Baths
Fluid Selection
77
Viscosity
The Product performs best when the fluid’s viscosity is 50 centistokes or less.
The lower the viscosity, the more easily the fluid stirs and the better the
temperature uniformity and temperature stability.
Silicone fluid generally becomes more viscous over time. The fluid can degrade
and thicken much more quickly when operated near the upper limit of its
temperature range. Check the fluid regularly to ensure it stirs easily and is below
the viscosity limit.
Fluids that have very low viscosity may spatter when stirred vigorously. It may be
necessary to reduce the stir speed.
Heat Capacity
The total heat capacity affects the rate at which the Product heats or cools.
Silicone fluids offer relatively low heat capacity and allow the Product to change
temperature up to two times faster than other fluids such as water.
Thermal Expansion
Fluids expand when heated. This causes the fluid level in the Product to rise or
fall as the temperature changes. Silicone expands more than some other fluids. It
is best to use the optional overflow kit to prevent bath fluid from spilling over the
top of the tank. Check the bath fluid frequently and add more if the level is below
the MIN mark on the stir guard.
If the overflow kit is not used, pay careful attention to the height of the fluid and
remove excess bath fluid to prevent it from spilling over the sides of the tank.
When you add fluid at a low temperature, fill only to the MIN mark on the stir
guard.
Lifetime
Silicone and other bath fluids deteriorate quickly when operated in the upper part
of their temperature ranges above the oxidation point. A bath fluid with a higher
temperature range may reduce the frequency at which the fluid must be
replaced.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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