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FAQ

What is ultrasonic?
Ultrasonic is sound generated beyond human audible level. In real life, high pitch sound is created by high frequency, and alternatively, the low and base tone is created by low frequency. Frequencies above 16 kHz in general are being considered as ultrasonic. Typical ultrasonic frequencies used for cleaning purpose are from 20 kHz to 80 kHz.


What is "cavitation"?
A."Cavitation" is the rapid formation and collapse of millions of tiny bubbles (or cavities) in a liquid. Cavitation is produced by the alternating high and low pressure waves generated by high frequency (ultrasonic) sound. During the low pressure phase, these bubbles grow from microscopic size until, during the high pressure phase, they are compressed and implode.

What is "degassing", and why should it be done?
A."Degassing" is the initial removal of gases present in the solution. Useful cavitation occurs after gasses have been removed from the cleaning solution, leaving a vacuum in the formed bubble. When the high pressure wave hits the bubble wall, the bubble collapses; it is the energy released by this collapse that will assist a detergent in breaking the bonds between parts and their soils.


What are the advantages of ultrasonic cleaning?

·       Easy handling

·       Shorter cleaning time

·       Less chemistry

·       Low cleaning temperatures

·       Reproducible result



What can I clean using ultrasonic technology?
This list is almost endless. Provided the product is non porous and can normally be immersed in water almost anything can be thoroughly cleaned. Here are some examples:

· Jewellery especially gold, silver & platinum

· Watchstraps & Waterproof Watches

· Coins and other collectibles

· Glasses & Sunglasses

· PCB Boards etc

· Engine/Model parts

· Toothbrushes & Dentures

· CD & DVD's (with the 7800 and Ultra 7000 models)

 

Which industry is ultrasonic cleaning suitable for?

·     Optical and glass industry

·     Electronic industry

·     Chemical industry

·     Galvanic industry

·     Fine mechanical industry

·     Power stations Engine components

·     Metal industry

·       Automobile industry  


What can I not clean?
There is very little, but if you have any doubt we strongly recommend you contact the manufacturer of the item you want to clean first. However we do know that we would not recommend the following without getting approval from the manufacturer first: Some precious stones eg, emeralds Some plastics some plastics are porous and the ultrasonic cleaning can cause some whitening

 

Can ultrasonic cleaning damage my parts?
With certain cautions, ultrasonic cleaning is considered safe for most parts. While the effects of thousands of implosions per second is very powerful, the cleaning process is safe since the energy is localized at the microscopic level. The most important cautionary consideration is the choice of cleaning solution. Potentially adverse effects of the detergent on the material being cleaned will be enhanced by the ultrasonics.

 

The difference between 28kHz and 40kHz?
Ultrasonic Cleaning Systems are available in two frequencies, 28kHz or 40kHz, to help match the unit to your application. Generally 28kHz is preferred for large massive parts or parts which are more densely packed. The higher 40kHz frequency is often used for smaller, more intricate parts or components with complex geometries.


How do I know if the unit is cavitating properly?
Most poor cleaning usually results from improper control of one or more process variable(s); such as choosing the wrong detergent solution, insufficient heat, or not allowing enough time for the particular soil to be removed. If you suspect that your ultrasonic cleaner is not cavitating properly, there are two simple tests you can perform: the "glass slide" test and the "foil" test.

 

Ultrasonic Cleaning: frequency higher the better?
The frequency of an ultrasonic cleaning device has nothing to do with the cleaning power. The ideal cleaning frequency is determined by what is going to be cleaned. Simply speaking, the higher the frequency the more capable it is to remove smaller particles.


What is the optimum cleaning temperature?
Heat usually enhances and speeds up the cleaning process, and most detergent solutions are designed to work best at an elevated temperature. The best way to find the optimum temperature, which will give you the fastest, cleanest and safest results, is to run tests. Usually, the best results are within the 40°C to 60°C range.


What is the purpose of the unit heater?
The primary purpose of the unit heater is to maintain a solution temperature between cleaning cycles. The tremendous energy released by cavitation will generate the heat for cleaning.

 

How do I get the best ultrasonic cleaning?
There are many considerations important to ultrasonic cleaning. Optimizing these variables will produce the best cleaning. The most important decisions to be made are choosing the proper cleaning solution, cleaning at the right temperature for the correct amount of time, and choosing the right size and type of ultrasonic cleaner.

 

What cleaning solution should I use?
Modern ultrasonic cleaning solutions are compounded from a variety of detergents, wetting agents and other reactive components. A large variety of excellent formulations are available, designed for specific applications. Proper selection is crucial for acceptable cleaning activity and to preclude undesirable reactivity with the part being cleaned. Your Bransonic® representative can help you to identify either the optimal 'stock' cleaning formula, or likely candidates to test and evaluate.

 

What cleaning solution shouldn't I use?
Flammables or solutions with low flash points should never be used. The energy released by cavitation is converted to heat and kinetic energy, generating high temperature gradients in the solution, and can create hazardous conditions with flammable liquids. Acids, bleach and bleach by-products should generally be avoided, but may be used with indirect cleaning in a proper indirect cleaning container, such as a glass beaker, and appropriate care. Acid and bleach will damage stainless steel tanks, and/or create hazardous conditions.

 

Why is a special solution required for cleaning?
Soils adhere to the parts... if they didn't, the soil would just fall off the parts! The purpose of the solution is to break the bonds between parts and their soils. Water alone has no cleaning properties. The primary purpose of the ultrasonic activity (cavitation) is to assist the solution in doing its job. An ultrasonic cleaning solution contains various ingredients designed to optimize the ultrasonic cleaning process. For example, increased cavitation levels result from reduced fluid surface tension. An ultrasonic solution will contain a good wetting agent or surfactant.


When should solutions be changed?
Cleaning solutions should be replenished when a noticeable decrease in cleaning action occurs, or when the solution is visibly dirty or spent. A fresh batch of solution at each cleaning session is usually not required.

 

What is the length of cleaning time?
Cleaning time will vary, depending on such things as soil, solution, temperature and the degree of cleanliness desired. Highly visible removal of soils should start almost immediately after the ultrasonic cleaning action begins. Cleaning time adjustment is the easiest (and most often misapplied) factor used to compensate for process variables. Although new application cycle duration can be approximated by an experienced operator, it usually must be validated by actual use with the chosen solution and the actual soiled parts.

 

What maintenance does my ultrasonic cleaner require?
All that is required is that after use you empty the tank of water and wipe clean. Because of the power of the cleaner if you were not to empty and wipe the tank then tiny metal particles will build up and over time could pierce a hole in the stainless steel water tank rendering the ultrasonic cleaner useless.

 
Why do I need a timer on my ultrasonic cleaner?
The length of time you clean your item relates to the quality of the finish. In most cases 3 to 6 minutes is more than sufficient however some older items will need longer to clean. To keep the antique look on some types of jewellery a 3-minute clean would be all that is required.


Why must basket or beakers be used?
Items being cleaned should never be placed directly on the tank bottom. Transducers (which produce the ultrasound) are bonded to the bottom of the tank. Items resting directly on the tank bottom can damage the transducers and/or reduce cavitation. Additionally, a basket or beaker will position the item within the optimal cleaning zone of the tank. The basket or beaker will also hold the load together and allow for easy, no-touch removal, draining and transport of the items to the next step in the cleaning process.

 

Why shouldn't I leave my cleaner on constantly?
Low solution levels can seriously damage your cleaner. Running your unit continuously runs the strong risk of lowered levels as the solution evaporates, especially when heated. Getting into the habit of shutting off the ultrasonics when not in use, and monitoring the solution level when in use, will yield many years of trouble free service from your ultrasonic cleaner.

 

Q. Why must I keep solution at the tank's level indicator?
The solution level should always be maintained at the level indicator in the tank, with trays or beakers installed. The ultrasonic cleaning system is a 'tuned' system. Improper solution levels will change the characteristics of the environment, can affect the system frequency, decrease effectiveness, and potentially damage the cleaner. Maintaining the proper solution level provides optimum circulation of solution around parts, and protects heaters and transducers from overheating or stress.