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7100 Calibration Bath
User's Guide
5.3
5.4
5.5
16
Bath Preparation and Filling
The 7100 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 or Methanol/Water mix
• Halocarbon 0.8
• Mineral oil
• Silicone oil
Fluids are discussed in detail in
Remove any 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 fluid if nec-
essary and with caution if the fluid is hot.
Be careful to prevent bath fluid from spilling on the stirring motor while filling.
Note: Underfilling may reduce bath performance and may possibly damage
the bath heater.
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 con-
tains a precision platinum sensor and is mechanically shock sensitive. Drop-
ping, 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 re-
placed. Contact an Authorized Service Center for assistance.
Insert the probe into the 1/4 inch probe hole in the top 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 labelled "PROBE".
Power
With the bath power switch off, connect the bath to an AC mains supply of 230
VAC (±10%), 60 Hz, 20 A, (50 Hz optional). The bath power wires are located
at the junction box at the back of the bath. The wires are left undressed to ac-
commodate a variety of connection scemes. Observe the correct wiring of the
power wires:
Section 8.1.
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