5.2
“Dry-out” Period
Before initial use, after transport, and any time the instrument has not been en-
ergized for more than 10 days, the bath needs to be energized for a “dry-out”
period of 1-2 hours before it can be assumed to meet all of the safety require-
ments of the IEC 1010-1.
5.3
Bath Preparation and Filling
Baths are not provided with fluid. Various fluids are available from Hart Scien-
tific 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
•
Mineral oil
•
Dow 200.10 silicone oil
•
Dow 200.20 silicone oil
•
Dow 710 silicone oil
Fluids are discussed in detail in Section 8.1.
Remove the access hole cover from the bath and check the tank for foreign
matter (dirt, remnant packing material, etc.). Use clean unpolluted fluid. Care-
fully 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 hot fluid if
necessary with caution.
Use caution to prevent bath fluid from spilling on the stirring motor while
filling.
NOTE:
Under filling may reduce bath performance and may possibly
damage the bath heater.
5.4
Probe
Inspect the bath control probe. It should not be bent or damaged in any way.
Reasonable caution should be used in handling this probe as it contains a preci-
sion platinum 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 (see Section 1.3) for assistance.
6020 Series Calibration Bath
User’s Guide
18
