Figure; Preparing The Test Vessel; Ots80Af/2 And Ots100Af/2 Oil Test Vessel; Ots60Af/2 Oil Test Vessel - Megger OTS 60AF Guia Del Usuario

Operation
1. Separate the cover holding the electrode mountings from the container.
2. Ensure that the vessel is thoroughly clean, both inside and out.
3. Mount the appropriate electrodes on the sliding arms, if they are not already in place. It may be
necessary to slacken one or both of the clamp screws at the base of the electrode supports and
move the sliding arms back. The sliding arms have a threaded stud and the electrodes screw on
to these. Screw on and tighten firmly with finger pressure.
Shrouded
Cover
connector arm
Container
Electrodes
Figure 4. OTS80AF/2 and OTS100AF/2
oil test vessel.
4. Set the gap between the electrodes according to the requirement of the testing specification
being undertaken. Spacing gauges are provided in the accessory kit for this purpose. The clamp
screws at the bottom of both electrode supports should be slackened and the sliding arms
moved so that the gap is approximately central between the two supports. Tighten the clamp on
one support to hold one side firmly, then adjust the other so that when the gauge is passed
between the electrodes it touches both simultaneously. Tighten the clamp screw on the second
support. Recheck the gap after it has been set.
A list of electrode shapes and gap spacing for standard testing specifications is shown opposite.
Each test display screen also shows electrode shape; spacing, and type of stirring for each pre-
programmed test specification, where appropriate.
5. Clean the vessel in accordance with the instructions given in the relevant test specification to be
used, then fill the container part of the vessel with the sample oil until the level is about 12 mm
( 1 ⁄ in) from the top.
2
6. If required, drop in a clean magnetic stirrer bar (not for ASTM D877 and ASTM D1816
specifications, or any case where impeller stirring has been selected). Ensure that the stirrer bar
is central in the vessel.
Note:- The ASTM D1816 specification requires continuous stirring. This is provided by the special
D1816 vessel by the motor driven impeller. See figure 13 on page 19.
7. Carefully reassemble the two parts of the test vessel.
10

Preparing the Test Vessel

Electrode
support
Container
Clamp screw
Sliding arm
Cover
Electrodes
Figure 5. OTS60AF/2 oil test vessel.
Connector arm
Electrode
support
Clamp screw
Sliding arm