The principle of operation of an ultrasonic bath – how to choose and use in production or at home

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To clean small items (parts, boards, jewelry, tools) you need a device consisting of a tank, emitter and electronic control unit. This is a washing ultrasonic bath, which is an indispensable assistant for electronics engineers, car repair masters, and jewelers. If the work requires washing small parts or objects, you need to buy an ultrasonic bath or do it yourself.

What is an ultrasonic bath

Ultrasound is sound in a higher range than the human ear can perceive. Its use in modern science has led to a number of fantastic discoveries. One of them is an ultrasonic bath, magically transforming dirty things into clean ones. This occurs as a result of the cavitation process – the formation and collapse of many small air bubbles on the treated surface. The microexplosion of each balloon is strong, the bubble is able to tear off a particle of dirt from the part or product even in the most inaccessible places.

The main details of the device are a capacity of 0.5 to 30 liters and an emitter for an ultrasonic bath operating in the range of 20–40 kHz. It is located under the bottom of the working tank and is electronically controlled. The principle of operation of the unit is simple: fill the bathtub with water, alcohol, another active chemical liquid, immerse in it an object that needs to be cleaned, turn on the emitter for only 2-3 minutes. You won’t believe your eyes: as a result of fluctuations in ultrasound, the part will become cleaner than new.

Industrial-grade Ultrasonic Cleaner

What is needed for

The scope of the bath is wider than you might imagine. Larger ultrasonic units are used in enterprises for cleaning large parts, tools, and blanks. There are baths with ultrasound even for washing clothes, washing dishes, processing vegetables. An ultrasonic emitter is built into many models of modern washing machines. Household baths are often bought to wash parts, circuit boards, nozzles, and jewelry..

For cleaning nozzles

The nozzle is a mechanism that is an elementary valve, electromagnetic, which doses the flow and atomization of fuel (it must do this as accurately as possible). It is difficult to wash the clogged nozzles, but the ultrasonic bath copes with this task. If necessary, the injector with nozzles is removed and washed with waves at a gentle frequency, repeating the procedure several times.

For phones

A phone that has fallen into the water can be saved by flushing the motherboard with ultrasound of a certain frequency. For this procedure, the technical services also use a household washing bath. The master will remove the board, remove parts from it that are harmful to contact with water (camera, speaker, microphone), lower it into the bathtub, fill it with a special solution and turn on the device to work at the given frequency. The board will be cleaned by air bubbles, the phone will be restored to function.

For washing parts

You can use the ultrasonic bath to clean the optics, metal, other solid parts from dirt, foreign components, traces of soldering or grinding. They use a device for cleaning components and parts of office equipment (excellent for flushing printer heads, increasing their life). They greatly appreciate the bathtub with the ultrasound of the master of jewelry production. Even products that are heavily soiled during wear will become completely clean after a few minutes of processing..

Cleaning parts in a homemade ultrasonic bath


An ultrasonic cleaning option may be preferable to a mechanical one. Sometimes it becomes the only way to clean up a contaminated part with traces of corrosion. Here are the main benefits of using an ultrasonic bath:

  • Processing a laundered item does not take much time.
  • No physical effort is required to mechanically remove dirt and rust..
  • Excellent effect is achieved in the most inaccessible places (waves know no barriers).
  • Ultrasound cleans objects carefully without leaving scratches or other defects on the surface.
  • The procedure can replace not only washing, but also light polishing..

How to use

Obvious, but extremely important recommendation: before using the ultrasonic bath, be sure to read the instructions for it! To clean the part or product from dirt, traces of corrosion, limescale, tap, well, distilled water, alcohol, soap solution, some types of solvents are used. During the operation of the bath, a buzzing sound is clearly heard, and many bubbles appear on the surface of immersed objects. Your unit maintenance steps are simple:

  • Open the lid and fill the working container with the selected fluid.
  • Place parts or products so that they are completely covered with water.
  • Check the fluid level, it should not rise above a special mark.
  • Close the lid, connect the device to a source of electrical energy.
  • Press the “start” button, in most models of the bath the standard duration of work will be 180 seconds.
  • If necessary, turn on the device again. For uniform cleaning of the part inside the bath, turn over.
  • If required, you can start by increasing the time or range of operation of the ultrasonic emitter.
  • When the process is completed, unplug the bath, drain the water. Do not forget to dry the container, and then send the device for storage..
  • Take care of the device; repairing an ultrasonic bath is troublesome and not always possible.

DIY Ultrasonic Cleaner

Based on their own needs, skillful craftsmen often make their own cleaner bath. On the web pages of their blogs and video channels, they generously share their schemes and best practices. Possessing elementary skills of working with a soldering iron, you can make a circuit board yourself – the brain center of a cleaning device, assemble an electric circuit according to the scheme, including an emitter in it. So you get an ultrasonic bathtub that meets your needs. Here is what you need for this:

  • a board made according to a proven scheme;
  • a light capacity made of stainless steel (saucepan, bowl, bowl) with a capacity of 0.5-1 l;
  • stand under the container (you can use a piece of plastic sewer pipe);
  • 12 volt power supply;
  • ferrite core;
  • emitter of ultrasonic waves;
  • epoxy adhesive for mounting the emitter.

Device and circuit of an ultrasonic bath

For ultrasonic waves to pass into the container, glue the emitter to the bowl strictly in the center, using epoxy glue for this. Ferrite core is needed for the manufacture of a choke. Wrap two dozen turns of copper wire on it (thickness 1 mm). Under the scheme, assemble the electronic and electrical parts of the device. Install the structure on the stand, strengthening the electronic “stuffing” inside. Test your homemade bath with chocolate foil. Under the influence of ultrasound, the foil in the bath is destroyed literally before our eyes.

Ultrasonic Cleaner

Distilled water is the best liquid for gentle handling of objects. But in the presence of strong pollution, or when you need a quick result, active additives and even aggressive chemical compounds are used. To clean silver, gold, optics, water is added up to 10% window cleaner. The circuit boards of phones that have been in the water “bathe” in ethanol or galosh gasoline. Each master has his own favorite recipe, any option is a subject of controversy and personal preferences.

It is important to understand that although flammable liquids are used in ultrasonic baths, they carry a danger. During operation of the ultrasonic emitter, the unit may have an unsafe temperature, and pairs of solvents, gasoline, alcohol, when working without an extract, are concentrated near a hot device. Therefore, manufacturers are strongly not recommended to take combustible mixtures as a working solution. This rule is often violated by masters. be careful!


Disassemble the broken bath, check the contacts and connections, ring the parts. If the ultrasonic emitter fails, it must be replaced. In this case, the repair price may be comparable to the purchase of a new device. If the bathtub is ultrasonic under warranty, you can’t open the case, look for a warranty workshop that produces devices of this brand, and entrust the repair to professionals.

How to choose an ultrasonic bath

If you do not like home-made appliances, and you decide to buy an ultrasonic bath for home use, you have to make an important choice. In the catalogs of online stores you can find dozens of units of different sizes, capacities, costs. Before ordering a wash bath, determine how much it should be. If you have to handle small objects, small parts, boards, a volume of up to one liter is quite enough. For automobile nozzles, medical instruments, parts and units of a larger size, the capacity should be 1.5-2 l.

The material of the working capacity of the device is stainless steel. Only it allows ultrasonic waves to freely enter the liquid and act on the object being cleaned. It is better to take the unit with a deeper bowl than with a shallow but wide one. However, consider the size of the items that will be laundered. They should be immersed in the bathtub as a whole. An oversized container may require more fluid, which is uneconomical.

When selling by mail, carefully read the technical specifications of the device, ask questions to the seller. Since the operation of the device is difficult to evaluate “by eye” in a few seconds, you will not be able to check its full serviceability at the place of issue. Promotions, discounts and sales on the Internet should be especially alarming. If the bathtub is selling too cheap, there is definitely something wrong with it.

Model of an ultrasonic bathtub of industrial class AMEGA 5821


A good device for ultrasonic cleaning is best purchased in online stores that have already built up a reputation as bona fide sellers. High-quality household bathtubs are presented in the Yandex market. Cleanliness will not cost you much, and a solid unit will last a long time and without interruptions. Here are the approximate prices for ultrasonic baths for Moscow and St. Petersburg:

Model name

Volume of the tank

US operating frequency


Skymen JP-008

0.8 L

42 kHz

3105 rubles


1,0 l

43-45 kHz

2550 rubles

AMEGA 5821

2.1 L

35 kHz

6000 rubles


0.5 l

40 kHz

1900 rubles


6.0 L

40-42 kHz

15 700 rubles

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