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Maintenance
WFM 90 and WFM 91 Service Manual
6–3
Inspection and Cleaning
Preventive maintenance consists of cleaning, visual inspection, performance
checking, and, if needed, readjustment. The preventive maintenance schedule
established for the instrument should be based on the environment in which it is
operated and the amount of use. Under average conditions, scheduled preventive
maintenance should be performed every 2000 hours of operation.
Protect this instrument from adverse weather conditions. The instrument is not
waterproof.
Do not expose the LCD display to direct sunlight for long periods of time.
CAUTION. To avoid damage to this instrument, do not expose it to sprays,
liquids, or solvents.
The instrument should be cleaned often enough to prevent dust or dirt from
accumulating. Dirt acts as a thermal insulating blanket that prevents effective
heat dissipation, and can provide high-resistance electrical leakage paths between
conductors or components in a humid environment.
Clean the exterior of the instrument by removing dust with a lint-free cloth. Use
care to avoid scratching the clear plastic display lens. A small soft-bristled brush
is useful to remove dust from around the selector buttons and connectors.
For further cleaning, use a soft cloth or paper towel dampened with water. You
can use a 75% isopropyl alcohol solution for more efficient cleaning.
CAUTION. To avoid damage to the surface of this instrument, do not use abrasive
or chemical cleaning agents.
If you must clean the interior of the instrument, allow the interior to thoroughly
dry before reassembling and applying power to the instrument.
Display Screen. The display screen is susceptible to smudging from dirt and
grease. The recommended cleaning agent is petroleum ether, which is available
from the vendor listed below:
JT Baker Inc.
Phillipsburg, NJ 08865 USA
(908) 859–2151
General Care
Cleaning