|About Ultrasonic Cleaning...
‘$OUND ADVICE’ about ~focusonics~
~ ULTRASONIC CLEANING and NOISE LEVELS ~
From time to time comments are made that the High Frequency Sound Waves used in ultrasonic cleaning can be of danger to humans, and such comments always must be considered and respected. However, these concerns are often based on individual speculation and to date have not been found to have factual substance or credibility.
In regard to ear damage from HF sound waves it needs to be recognised that the process of cleaning using HF operates entirely, and only, within a liquid. The pressure waves are not transferred to the surrounding air, and in any case frequencies used for ultrasonic cleaning would be too low to be effective in the air. (source D.J. Rigby Technical Director Ultrawave Limited UK)
This ‘sonar’ can be compared to that used for thousands of years by marine mammals to communicate with each other and to plot their position on our globe. These HF emissions are not considered to be a danger to humans
Audible noise on the other hand, can be a disturbing distraction and could result in hearing damage if uncontrolled. High frequency sound by definition, is above the upper frequency hearing limit for humans, so what is audible are cavitational and panel resonance noises.
There are no New Zealand or EU regulations in force at the moment governing the noise generated by ultrasonic cleaning baths. The Australian Standard for “Ultrasonic Cleaners for Hospital Use” states that 75dbA should not be exceeded. Ultrawave Sonic baths are below this level.
In practice, the siting of the ultrasonic bath can influence the users perception of noise. In a small tiled room for example, 51dbA may be viewed as ‘loud’, while in a carpeted room with no echoes 51dbA will be ‘quiet’.
It has also been found that for females, the noise generated during cavitation is initially more intrusive than for males, but females grow accustomed to the noise far quicker than do males.
Often during the degassing period, (removal of air and gasses from newly introduced cleaning solution), a screeching noise can be heard. This is not the normal operation sound associated with ultrasonic cleaning and should cease once the bubbles of unwanted gas have been dispersed.
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