Frequency is a vital element of ultrasonic cleaning. It has an effect on the size of ultrasonic bubbles and on the strength of the implosion of the bubbles. And so, it is important to use the right frequency in ultrasonic cleaning.
The right frequency to use is based on two factors: the type of item to be cleaned and the type of contaminants to be removed. The smaller and more delicate the item is and the smaller the contaminants are, the higher the frequency that should be used. Likewise, the bigger and sturdier the item is and the larger the contaminants are, the lower the frequency that must be used. High frequencies produce smaller cavitation bubbles and weaker implosions. On the other hand, low frequencies produce bigger cavitation bubbles and stronger implosions.
If small and fragile items such as surgical instruments are to be cleaned, the minimum frequency that should be used is 81 kHz. Less intense implosions are enough to remove the small contaminants from these items. If the items to be cleaned are big and durable, the frequency has to be not higher than 79 kHz. Big and durable items can put up with the intense implosions of big cavitation bubbles.
In cleaning items with varying sizes of contaminants, high and low frequencies have to be used. The right way to clean items using different frequencies is by starting with low frequencies. After running the ultrasonic cleaner with low frequencies for a few minutes in order to remove the bigger contaminants, the frequency should be increased to remove the smaller contaminants. Keep in mind that an ultrasonic cleaner should not be run with low frequencies for a long time. This is to prevent cavitation erosion.