Operation Manual____________________________________________________________Accessories
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9-6
EXTENDER TIP
Half-Wave and Full-Wave Extenders are used to extend the length of a horn and provide
longer reach when needed. Extenders attach directly to the end of any tapped horn of equal
tip diameter. They are cylindrical (not tapered or stepped), and are available in lengths of 5"
or 10".
When Extender Tips are used for long-duration sonication at high output settings, they may
develop considerable heat. Do not allow them to exceed 140 F (60 C), and do not exceed
the MICROTIP limit of 5 on the Amplitude Control Knob.
Always tune the system before using the Extender Tip. As with any combination of horns
and tips, optimum operation is obtained only by tuning the generator to obtain the lowest
possible output power readings. Tuning assures that the operating frequency of the
generator is matched to the resonant frequency of the convertor, horn and Extender Tip.
For tuning instructions see 7-1 through 7-3.
SAPPHIRE TIPPED HORN
1. Sapphire tips are thin discs of pure, water clear, boule-grown, synthetic sapphire,
bonded with extremely high-shear epoxy to the radiating face of solid ultrasonic
horns. Sapphire discs can not be used on removable flat tips because the wrenching
forces are transmitted to the disc and cause fracture. Sapphire discs are not applied
to horns under ½” (12.7 mm) in radiating face diameter.
2. Sapphire tip discs are very hard, with a rating of 9.0 on the Mohs scale (where
diamond is 10). However, they are also easily fractured by mechanical shock or
bending. Therefore, avoid any contact between the tip and any solid object,
especially when the horn is energized.
3. A thin layer of epoxy holds the sapphire disc to the end of the horn. This epoxy is
subject to cavitation erosion and leaching under strong chemical attack. Always
check the condition of the bond. Visible loss of epoxy under the tip will result in
eventual failure of the disc.
4. The sapphire tip generates cavitation in liquids exactly in the same manner as the
titanium tips. The sapphire disc will normally last approximately 10 times longer than
the regular titanium tip. Erosion appears as a matte finish on the radiating face.
Eroded discs can NOT be refinished or polished.
5. Cracked, broken or eroded discs can be removed from used horns and replaced at
the factory. Contact MISONIX or local representative for current replacement
information.
6. Horns with broken or chipped discs should never be used. Erosion could occur on
the exposed face of the horn and render it unsalvageable.
7. Be sure to store sapphire tipped horns in a safe place and well protected from
impact. Ambient temperatures and humidity will not damage the disc or epoxy.
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