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About Ultrasonic Cleaning...

‘$OUND ADVICE’ about ~focusonics~

~ The significance of TRANSDUCER OUTPUT in Industrial Baths ~


The ultrasonic power requirements for cleaning by cavitation ranges from two watts per litre for lightweight cleaning of glass parts upto 20 w/l for heavy duty items like machine parts. Also, large solid steel items will not only displace more of the activated cleaning solution, but can absorb upto a third of the energy generated by the transducers.

Some suppliers cause confusion when quoting, because they either take no care to establish the make up of the items being cleaned, or they do not understand the power requirements. An experienced supplier may have quoted 2000 watts, while another supplier has quoted on only providing 1000 watts at a correspondingly lower price. The customer, unaware of the need to have a system that suits their requirements, has accepted the lower priced unit, had an inferior job, and then come to the conclusion that ultrasonic cleaning is "not what it is cracked up to be"

Example - A simplistic view...

For a 60 litre capacity bath with twelve transducers at 50 watts per transducer, the total watts per litre output is ten.

A low cost bath of the same size with ten transducers will produce 8.3 watts per litre. A reduction in cleaning power of 20% requiring a longer cleaning cycle.

On the other hand a bath fitted with 24 transducers and working 90 litres has double the output but only one and a half times the capacity. This unit has a watts per litre ratio of thirteen giving a 30% increase in cleaning power.


Considering that items being cleaned vary in shape, size, quantity, degree and type of soiling it will be recognised that cleaning using ultrasonic waves is not yet a precise operation. Therefore the experience and knowledge of the supplier and/or operator are important factors in deciding on the best application for any particular job. Even then, optimum output for new ventures may still take some "trial and error" evaluation by the supplier and/or operator.

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