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7.2
Bath fluid
Heat transfer salt works with the 6055 bath up to 550°C. Other fluids
SHOULD NOT be used with the 6055 bath.
7.3
Fluid system
The fluid system consists of the insulated tank, the stirrer assembly, the drain,
the overflow test well, and the fluid. The heaters and probe, which are part of
the control system, are physically internal to the tank.
The tank and other wetted parts are made of stainless steel. The stirrer is at-
tached to the tank top plate of the bath and its motor receives additional cooling
from a fan to keep from overheating and to increase the lifetime at high bath
temperatures. The stirrer directly drives three 2-inch diameter stirring propel-
lers. The down draft from the propellers forces the fluid through the overflow
test well. The stirring motor plugs into the rear of the control unit. (See Figure
5 on page 26.)
The over-flow test well serves to provide a constant depth of fluid at an essen-
tially constant height near the well opening. Variations in fluid volume due to
thermal expansion and evaporation do not effect measurements within reason-
able volume ranges. The fluid expelled from the tank is controlled to flow past
the control heaters first before entering the main tank for thermal management.
WARNING: The drain is for factory use only.
7.4
Fluid Drain
The drain on the bottom of the bath (see Figure 4 on page 24) is for factory use
only. During operation of the bath the drain plug must be screwed on tightly.
7.5
Filling the bath
The bath is shipped dry. Check inside of the test well for foreign matter and re-
move it to avoid interference with operation.
7.5.1
Using heat transfer salt
7.5.1.1
The first salt load
Salt comes in small bead or granular form which is initially pink in color. Ap-
proximately 70 pounds are required for the installation.
The following procedure is required if the bath is empty and will be filled with
bead or granular salt.
7 General operation
Bath fluid
25
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