10
Test vessel mortised stirrer
Unpack the optional motorised stirrer assembly from its box and fit the stirrer shaft to the underside of the stirrer
assembly. The unit is ready for use. The oil test vessel lid is removed and the stirrer assembly used as a lid for tests that
require stirring.
Megger supplies as standard with the stirrer lid assembly the large red impeller which is useful for very dirty oil. This has
larger blades to help ensure the effective circulation of any particulates between the electrodes during the test so that
the full potential of their effect on breakdown voltage may be assessed.
The other two impellers are alternative impellers. The Impeller on the left is optimised for IEC 60156, whilst the one on
the right is ideal for ASTM D1816.
Vigorous circulation can exacerbate the inclusion of any moisture captured on the surface film of oil left behind after
rinsing at the vessel preparation stage, making the need for rapid filling even more critical, so as not to detrimentally
affect breakdown results.
Refer to application note ref “OTS_VESSEL_AN_en” for further information on vessel and impeller preparation.
Note: this colour highlighted text from OTS vessel app note
Transportation and storage
The OTS100AF/80AF/60AF are precision instruments that generates HV up to 100 kV depending on model and needs
to be transported and stored carefully.
The unit should be stored in a room or area where the environment is within the temperature range of -30 ºC to 65 ºC
and maximum humidity of 95% at 45 ºC.
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