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6050H Calibration Bath
User's Guide
8.2
8.3
28
cially dangerous are spills since the hot fluid is difficult to contain. Salt may
also cause steam explosions if it comes into contact with water or other volitile
fluids. Using salt requires special caution. Read carefully the information and
safety data sheets provided with the salt. Use of a fume hood is recommended
to remove any products of decomposition or oxidation.
Because salt is solid at room temperature special procedures are required in us-
ing the bath with salt. Before filling the bath with solid salt disconnect the stir-
ring motor to prevent it from being damaged. (See Section 9.11.2, Stir Mode
Select.)
CAUTION: Never allow the stir motor to run with solid material in the
bath. Restraining the motor from turning may over-heat and damage the
motor. Use HIGH heat (Heater Switch) and "LO" Heat Up Power (see
section 9.11.4) with solid salt. A Fast Start Heater Model 2024 may be
used to aid in the melting of solid salt. See Section 9.11.2, Stir Mode Se-
lect, on page 40.
Solid salt has poor thermal conductivity. The 6050H bath uses a special "soft
start" program to prevent the heaters from being overheated until the salt is
completely molten. This program controls the heater duty cycle at 25% until
the bath temperature reaches 200°C. To allow the bath to control below 200°C
the soft start feature must be deactivated (see Section 9.11.2, Stir Mode Select,
on page 40 , Section 9.11.3, Stir Set-point, on page 41, and Section 9.11.4,
Heat Up Power, on page 41).
Salt is supplied in a pink granular form. Fill the bath gradually as the salt heats
and melts. Because of the heat required to melt the salt this is a slow process
and may take 10 hours or more. Fill the bath until the liquid is a few inches be-
low the lid. The level will rise as much as two inches as it is heated to the upper
temperature limit.
Stirring
Stirring of the bath fluid is very important for stable temperature control. The
fluid must be mixed well for good temperature uniformity and fast controller
response. The stirrer is precisely adjusted for optimum performance.
When the salt in the bath is solid, it is very important that the stirrer power be
disconnected until the salt melts. Otherwise, the stirrer will likely over-heat and
be damaged.
Power
Power to the bath is provided by an AC mains supply. See Section 3.1, Specifi-
cations, for power details. See Figure 5 on page 26. Power to the bath passes
through a filter to prevent switching spikes from being transmitted to other
equipment.
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