250 - 450 Sonifier Chapter 7: Maintenance
User’s Manual Preventive Maintenance
100-413-016 Rev. C 7 - 3
Place the horn in a container of alcohol and turn the power on for a few seconds
to clean the interior threads. Remove the horn from the alcohol. Operate the horn
in air for a few seconds to dry the tip and threads, which must be thoroughly dry
and clean prior to reassembly
Using a spanner wrench on the horn and an open-end wrench on the tip, install the
tip tightly using the following torque specifications:
• 1/4 - 20 -- tighten at 90 inch-lbs./10.16 Newton-meters.
• 1/4 - 28 -- tighten at 110 inch-lbs./12.42 Newton-meters.
• 3/8 - 24 -- tighten at 180 inch-lbs./20.33 Newton-meters.
The 250/450 Sonifier does not require retuning.
7.3 Preventive Maintenance
Periodically Clean the Equipment.
Periodically disconnect the unit from power, remove the cover and vacuum out
any accumulated dust and debris. Remove material adhering to the circuit boards,
cooling intake vents and exhaust ports. External covers may be cleaned with a
damp sponge or cloth using a solution of mild soap and water. Do not allow clean-
ing solution to enter the unit.
7.4 Reconditioning the Stack Interface
Ultrasonic system components work most efficiently when the mating surfaces of
the Converter-and-Horn combination (also called a “Stack”) are flat, in solid con-
tact, and free from fretting corrosion. Fretting corrosion refers to a black, crusty
build-up, resulting from friction between metal parts, that appears on the Stack
mating surfaces. Poor contact between mating surfaces wastes power output,
makes tuning difficult, increases noise and heat, and may cause damage to the
converter.
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