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6
Bath Use
CAUTION: Read before placing the bath in service.
The information in this section is for general information only. It is not de-
signed to be the basis for calibration laboratory procedures. Each laboratory
will need to write their own specific procedures.
6.1
General
The 6050H bath is intended tob used with heat transfer salt only. Refer to the
MSDS (Material Safety Data Sheet) for information specific to the salt se-
lected. Generally, baths are set to one temperature and used to calibrate probes
only at that single temperature. This means that the type of bath fluid does not
have to change. Additionally, the bath can be left energized reducing the stress
on the system.
The bath generates extreme temperatures. Precautions must be taken to prevent
personal injury or damage to objects. Probes may be extremely hot or cold
when removed from the bath. Cautiously handle probes to prevent personal in-
jury. Carefully place probes on a heat/cold resistant surface or rack until they
are at room temperature. It is advisable to remove the salt from the probe be-
fore inserting it into another bath. This prevents the mixing of fluids from one
bath to another. If the probe has been calibrated in liquid salt, carefully wash
the probe in warm water and dry completely before transferring it to another
fluid. Always be sure that the probe is completely dry before inserting it into a
hot fluid. Some of the high temperature fluids react violently to water or other
liquid mediums. Be aware that cleaning the probe can be dangerous if the probe
has not cooled to room temperature. Additionally, high temperature fluids may
ignite the paper towels if the probe has not been cooled.
For optimum accuracy and stability, allow the bath adequate stabilization time
after reaching the set-point temperature. Modify the access cover to accept
probes for calibration. The bath should be covered at all times. Allowing the
access cover to be open during the calibration process reduces the stability and
accuracy of the test and increases the outgassing of the fluid which can cause
safety concerns for attending personnel.
6.2
Comparison Calibration
Comparison calibration involves testing a probe (unit under test, UUT) against
a reference probe. After inserting the probes to be calibrated into the bath, al-
low sufficient time for the probes to settle and the temperature of the bath to
stabilize.
One of the significant dividends of using a bath rather than a dry-well to cali-
brate multiple probes is that the probes do not need to be identical in construc-
tion. The fluid in the bath allows different types of probes to be calibrated at
6 Bath Use
General
21
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