Maintenance - Fluke 7341 User Manual

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Maintenance

The calibration instrument has been designed with the utmost care. Ease of op-
eration and simplicity of maintenance have been a central theme in the product
development. Therefore, with proper care the instrument should require very
little maintenance. Avoid operating the instrument in dirty or dusty
environments.
• A battery is used to maintain operating parameters in the unit. All operat-
ing parameters, including calibration parameters should be checked on a
regular basis to insure accuracy and proper operation of the instrument.
See the troubleshooting section for the procedure on checking the status
of the battery.
• If the outside of the bath becomes soiled, it may be wiped clean with a
damp cloth and mild detergent. Do not use harsh chemicals on the sur-
face, which may damage the paint.
• Periodically check the fluid level in the bath to ensure that the level has
not dropped. If the fluid level is too low, the stability may be affected.
Changes in fluid level are dependent upon several factors specific to the
conditions in which the equipment is used. A schedule cannot be outlined
to meet each set of conditions. Therefore, the bath should be checked
weekly and adjustments made as required.
WARNING: Before servicing the instrument, disconnect the power mains.
• Periodically remove the top cover of the bath and wipe out oil around the
outside of the gasket. In order to do this, remove the four screws on the
top surface and the two screws at the rear of the bath. Lift the cover just
far enough to wipe out the collected oil.
• Heat transfer medium lifetime is dependent upon the type of medium and
the conditions of use. The fluid should be checked at least every month
for the first year and regularly thereafter. This fluid check provides a
baseline for knowledge of bath operation with clean, usable fluid. Once
some fluids have become compromised, the break down can occur rap-
idly. Particular attention should be paid to the viscosity of the fluid. A sig-
nificant change in the viscosity can indicate that the fluid is contaminated,
being used outside of its temperature limits, contains ice particles, or is
close to a chemical breakdown. Once data has been gathered, a specific
maintenance schedule can be outlined for the instrument. Refer to Section
8, General Operation, for more information about the different types of
fluids used in calibration baths.
• Depending on the cleanliness of the environment, a schedule should be set
for cleaning the condensing coil fins which can be accessed via the Re-
frigeration Condenser Access Door, refer to Section 7.2. The schedule
should be set dependent upon the laboratory environment to ensure that
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