7008
Users Guide
5-2
5.2 “Dry-out” Period
Before initial use, after transport, and any time the instrument has not been
energized for more than 10 days, the bath will need to be energized for a “dry-
out” period of 1-2 hours before it can be assumed to meet all of the safety
requirements of the IEC 1010-1.
5.3 Bath Preparation and Filling
The Model 7008 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:
• Water
• Ethylene Glycol/Water
• Methanol
• Mineral oil
• Silicone oil
Fluids are discussed in detail in Section.
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.
Note that under filling may reduce bath performance and may possibly damage
the bath heater.
5.4 Probe
Inspect the bath controller probe. It 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 and is mechanically shock sensitive. Dropping,
striking, or other physical shock may cause a shift in resistance in the probe
resulting in diminished bath accuracy. If damaged, the probe can be replaced.
Contact an Authorized Service Center for assistance (see Section 1.3).
Insert the probe into the 1/4 inch probe hole at the top left side of the bath lid.
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”.
5.5 Power
With the bath power switch off, plug the bath into an AC mains outlet of the
appropriate voltage, frequency, and current capacity. See the specifications on
page 9 for power requirements.
Be sure the stirring motor power cord is plugged into the “STIRRER” socket at
the back of the bath.
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