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Dual-Frequency Equipment Increases Ultrasonic Cleaning Capability

Ultrasonic cleaner operating frequency in kHz determines the intensity of cavitation action in removing surface contaminants. Lower frequencies such as 25 kHz produce relatively large cavitation bubbles that implode with greater intensity than higher frequencies such as 45 kHz. That’s why low frequencies are used to remove heavy soil buildup on sturdy parts such as engine castings and also polishing compounds and pastes.  Higher frequencies are safer when cleaning highly finished or delicate surfaces.  Companies that provide ultrasonic cleaning services or companies that produce and clean a variety of products may find a dual-frequency ultrasonic cleaner a wise investment – essentially doubling their cleaning capability with a single unit.

The TIH-MF2 Ultrasonic Cleaner

The TIH-MF2 Ultrasonic Cleaner

Excellent examples of dual frequency benchtop industrial ultrasonic cleaners are found in the TIH-MF2 series such as the 5-gallon capacity Elma TIH500MF2operating at a user selected 25 or 45 kHz. These versatile cleaners are also offered in 1.3, 2.5, and 4 gallon tank sizes.  Optional cleaning basket dimensions range from 7.9 x 3.9 x 3.5 in. to 11.4 x 10.6 x 5.1 in. deep.

Note that when selecting any benchtop ultrasonic cleaner the basket size is the defining dimension rather than the interior dimensions of the cleaning solution tank. The basket should be sufficiently large to ensure that all surfaces of whatever is being cleaned are fully immersed in the cleaning solution.  In no case should objects being cleaned be allowed to rest on the tank bottom.

Other Production-Enhancing Features

The correct ultrasonic cleaning frequency is but one of the many factors that contribute to fast, safe and effective cleaning.  Adjustable ultrasonic power or intensity allows operators to “fine tune” a cleaning cycle to match the surfaces or composition of parts being cleaned.  This helps avoid potential damage to the surfaces.  The TIH-MF2 ultrasonic cleaners enable operators to control power from 10% to 100% of the equipments’ power ratings.  This may be a trial-and-error procedure when cleaning a delicate surface by starting at a lower intensity and gradually increasing it to a point where cleaning efficiency is maximized without affecting surfaces being cleaned.  This guides future cleaning steps.

The operator-activated “degas” mode is used when preparing fresh cleaning solutions in order to drive off cavitation-inhibiting trapped air.  Degassing can also be activated to degas solvents placed in flasks, and for other sample prep activity in the research lab.

The “sweep” mode is activated to provide a slight ± variation in ultrasonic frequency to assure homogeneous cleaning action throughout the bath.  This avoids what are called hot spots that can damage surfaces, and what are called dead zones – areas of no cavitation action.  A “normal” mode can also be selected to mix, dissolve or disperse samples.  Degas, sweep and normal cannot be activated simultaneously in the TIH-MF2 series of ultrasonic cleaners.

Operators are able to set cleaning solution temperature as recommended by the solution formulation.  Temperature can be adjusted up to 80?C (generally the upper limit for effective ultrasonic cleaning).  Active heating is indicated by a pilot lamp and on-off switch. The pilot lamp will go out when the selected temperature is reached.

Lastly the timer allows operators to set the cleaning cycle up to 15 minutes or continuous operation with manual shutoff.

Two More Operating Tips

Activate the ultrasound when the solution is being heated as it helps to circulate the solution in the tank to ensure even heating. Keep the optional lid, either standard or insulated, in place at all times when the unit is operating to cut down on noise and minimize solution evaporation.

Call the cleaning experts for more information on the TIH-MF2 series or other industrial ultrasonic cleaners that meet your specific cleaning requirements.


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