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7108
Users Guide
4.3 Bath Preparation and Filling
The Model 7108 bath is not provided with a fluid. Various fluids are available
from Hart Scientific and other sources. Depending on the desired temperature
range, any of the following fluids, as well as others, may be used in the bath:
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•
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Fluids are discussed in detail in Section 7.2.
Remove any access hole cover from the bath and check the tank for foreign
matter (dirt, remnant packing material, etc.). Use clean unpolluted fluid. Carefully
fill the bath through the large square access hole to a level that will allow for
stirring and thermal expansion. The fluid should never exceed a height of 1/2"
below the top of the tank. Carefully monitor the bath fluid level as the bath
temperature rises to prevent overflow or splashing. Remove excess fluid if
necessary and with caution if the fluid is hot.
Be careful to prevent bath fluid from spilling on the stirring motor while filling
Under filling may reduce bath performance and may possibly
damage the bath TEDs.
4.4 Probe
Inspect the bath controller probe. This probe should not be bent or damaged in
any way. Reasonable caution should be used in handling this probe as it
contains a precision thermistor sensor. If damaged, the probe can be replaced.
Contact Hart Scientific Customer Service for assistance.
Insert the probe into the 1/4 inch probe hole at the center of the stirrer motor
cover. The tip of the probe must be well immersed in the fluid. The probe
connector is plugged into the rear of the bath into the socket labeled "PROBE".
4.5 Power
With the bath power switch off, plug the bath into an AC mains outlet of the
appropriate voltage, frequency, and current capacity. Normally this will be 115
VAC ( ±10 %), 50/60 Hz, 3 A (or 230 VAC [ ±10 %], 50/60 Hz, 1.6 A switchable).
Be sure the stirring motor power cord is plugged into the "STIRRER" socket at
the back of the bath.
4-2
Water
Ethylene Glycol/Water
Methanol
Mineral oil
Silicone oil
NOTE:
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