Copyright 2013 Baker Hughes Company.
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TC / Liquid
TC Temperature Calibrators | 15
4.3.5.7 Notes on Cleanliness
The verification and calibration of DUT can lead to a contamination of the calibration liquid.
Contamination can lead to smeary gel effect on the bottom of the tank due to the rotation of the
magnetic stirrer. This can effect the calibration accuracy.
It is highly recommended to:
1. Clean the micro bath tank / tub insert.
2. Clean the DUT before calibration.
3. Replace worn magnet stirrers.
4. Replace contaminated calibration liquid.
4.3.5.8 Notes on Calibration Liquid Fill Level
The fill level in the micro bath or tub insert rises as a result of:
a. Thermal Expansion – Calibration liquids expand to varying degrees as a result of heating.
The increase in fill level depends on the calibration liquid in use and the applied temperature.
b. Displacement by Sensors – The volume displaced by DUT must be taken into account in
determining the filling amount.
c.
Rise due to Stirring – The rotation of the magnetic stirrer forms a whirlpool in the liquid. This
raises the fill level at the wall.
INFORMATION
Only use clean calibration liquid.
PREVENT FAILURE
Do not exceed the maximum fill level during operation.
Overflow of calibration liquid causes contamination and may cause damage to
the calibrator.
INFORMATION
Incorrect calibration liquid fill level results in inaccurate
calibration. Filling above the maximum fill level leads to excessive heat
dissipation, preventing compliance with specified tolerances.
