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8. MAINTENANCE
It is recommended to periodically inspect the unit, both visually and physically, to en-
sure 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 dis-
coloration. If discoloration is found, move the unit away from the source of the con-
taminant.
Examine the condition of the high voltage cable that attaches the converter to the gen-
erator. 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 cer-
tain the cable always has slack and is never tensioned. If necessary, move the generator
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 homogenizers create high intensity vibration which puts stress on the con-
verter and horn 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 result-
ing at the point of contact with the vessel could cause the small probe tip 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 de-
crease. The smoother and shinier the tip, the more power will be transmitted into the
sample. The vibrations may also cause the probe tip 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 fre-
quently or monthly for those used infrequently. The tip must be examined for exces-
sive wear and to ensure that the threaded connection is clean and attached properly to
the convertor. 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.
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