CIRCUTOR OT2-60D - Manual (Page 14)

DIELECTRIC STRENGTH TESTER FOR ISOLATING OILS OT2-60D --------- Page 14
8. PERFORMING SPECIAL OPERATIONS (MAINTENANCE)
The following section contains information on the care and upkeep of your new OT2-
60D AC Dielectric Oil Test Set . There are some notes on troubleshooting and service,
which will save much time and money over the life of the unit.
8.1. Adjust the Voltimeter to zero if required.
The OT-60D Dielectric Oil Test Set uses precision metal film resistors for
measurement and calibration of the voltmeter. The use of these resistors has
minimized circuit drift due to aging and temperature. But, a potentiometer (R16
on the voltmeter PCB-037 can be used to correct for movement changes from
the aging of the meter.
The certification of meters on a yearly basis is recommended to ensure
accurate test results.
8.2. Other adjustments
The electrodes will be examined frequently to observe punctures or other
deteriorations and must be maintained in good state or to replace them when it
is observed that they are deteriorated (for example punctures by effect of
discharges).
The new electrodes, the pricked electrodes, and those that suitably have been
kept during a considerable time must be cleaned of the following form:
- Disassemble the electrodes of the cell using the provided Allen
spanner, very carefully, avoiding to touch directly with the fingers,
very important at the end of the electrodes, in which the electrical
arc takes place.
-
Clean all the surfaces with an appropriate volatile dissolvent and let
it evaporate.
- Polish with an abrasive powder (for instance, red fine dust to polish)
or with an abrasive paper or cloth (for instance, very fine polishing
cloth or canvas).
-
After polishing, clean with petroleum ether (reactive for analysis,
rank of boiling 60ºC to 80ºC), followed of acetone (reactive for
analysis).