4
Items not suitable for ultrasonic cleaning
Soft jewelry:
Pearls, emerald, ivory, coral, agate,
sea turtle shells, etc.
These items are not hard, so scratches may occur during
cleaning.
Welded, plated and glued items:
Welded or plated metal items, glued items
Ultrasonic cleaning may enlarge the gaps inside the welded
joints, plated coating or qlued items and may cause sepa-
ration.
Watches:
Except diver´s watches with depth rating over
50 m (150 ft)
Because the strong penetration capability of the ultrasonic
waves, water may get into the watches if they are not truly
waterproof. Use the watch stand supplied as a precaution
if not sure.
Others:
Wood, coated glass, ceramic, camera filters
with preexisting cracks
Ultrasonic cleaning may enlarge the cracks pre-existed in
the coating on the glasses, ceramic, and glass. If the items
have no pre-existing cracks, then it is okay.
Different wave patterns for different cleanin effectiveness
Wave pattern
(Standard test specimens cleaned in 3 minutes, showing approximate areas cleaned):
Cleaning effect
Very effective cleaning Effective cleaning Less effective cleaning
GUC 851 utilizes professional grade full wave circuitry. If the unit is turned on while the tank is empty,
the ultrasonic energy will not be conveyed out through the media (water or solution). The power may jump
to 80 W immediately, the tank will become hot and the PCB could be damaged after 20 seconds. Therefore
this unit should not be turned on while it is empty.
Full-wave circuitry
in GUC 851
Half-wave circuitry in other
personal models
Full-wave circuitry