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8. MAINTENANCE
It is recommended to periodically inspect the unit, both visually and physically, to ensure
optimum and safe performance. This inspection should be scheduled as a routine maintenance
procedure, done with the unit power OFF and with the unit unplugged from the AC power
source.
Long exposure to acids or caustics results in corrosion of metal parts or components. Check the
power supply, converter, and cables periodically for any signs of rust or discoloration. If
discoloration is found, move the unit away from the source of the contaminant.
Examine the condition of the high voltage cable that attaches the converter to the power supply.
Inspect the wire insulation for damage, such as wear, burning from hot plate contact or
breakage from extended use or rough handling. In general use, the cable assembly should not
be used to carry the converter or pull it toward the user. Make certain the cable always has
slack and is never tensioned. If necessary, move the power supply or converter assembly
closer to one another to accomplish this.
WARNING: Do not use a cable with broken end
connections, exposed wires or frayed insulation. High voltage is present in the cable
and will pose a shock hazard. Do not touch the converter assembly until the power
switch is off and the unit is unplugged.
8.1.
PROBE MAINTENANCE
Ultrasonic processors create high intensity vibration which puts stress on the converter and
probe assembly. The sides and end of the probe must
never
be allowed to come in contact with
anything but the solution. When using a probe, the stress resulting at the point of contact with
the vessel could cause the probe to fracture.
Proper care of the probe is essential for dependable operation. The intense cavitation will, after
usage for period of time, cause the tip to erode, and the power output to decrease. The
smoother and flatter the tip, the more power will be transmitted into the sample. The cavitation
may also cause the probe to loosen over time or the threaded connection to accumulate debris.
Note:
A loose probe will usually generate a loud piercing or squealing sound.
For that reason,
it is recommended that a preventative maintenance schedule be adopted
to examine the unit at regular intervals.
The schedule should depend on frequency of use.
Weekly maintenance schedules are recommended for units used frequently or monthly for those
used infrequently. The tip must be examined for excessive wear and to ensure that the
threaded connection is clean and attached properly to the converter. Use a cotton swab and
alcohol (i.e. ethanol, isopropyl, etc.) to clean the threaded mating surfaces.
When excessive wear (corrosion/pitting of the probe tip) is detected, the probe should be
replaced with a new one.
WARNING:
Probes must be properly tightened with the appropriate Wrench Set.
