Foil test

Function test of an ultrasonic bath Information
A foil test should be carried out before the first application and at regular intervals, e.g. every 3 months. This serves to ensure the consistent effect of the ultrasound. The frequency of the test is your responsibility. The foil test is a simple procedure for visualising the intensity and distribution of cavitation in an ultrasonic bath. An aluminium foil stretched over a foil test frame is inserted for this purpose. This is perforated or destroyed to a certain degree by cavitation, depending on the duration of the sonication. For the comparability of the results, it is important that the conditions of the foil test are always the same:

• Fill the oscillating tank up to the fill level mark,
• Temperature of the sonication liquid,
• Degassing time,
• Positioning of the frame,
• Film type (brand, thickness),
• Sonication duration,
• Type and concentration of the ultrasound preparation.

Carrying out the foil test

1. Fill the oscillating tank up to the fill level mark
   with water and a suitable ultrasonic preparation in the quantity specified by the manufacturer.
   Dosage.
2. Degas the acoustic fluid.
3. Tension the aluminium foil (household foil
   10 μm to 25 μm thick) on the foil test frame. Depending on the size
   of the tray, the frame may protrude. It is sufficient to remove the part of the foil frame
   which is covered by the sonication liquid.
4. Place the covered foil test frame diagonally in the centre of the oscillating tank. Fix it in place if necessary.
5. Switch on the ultrasound. Sonicate the film for at least 1 minute until a visible perforation or hole appears. For more stable films (thicker or coated), the sonication time can be up to 3 minutes. Make a note of the duration of your test.
6. Switch off the ultrasound. Remove the foil test frame. Remove the
   Remove the aluminium foil from the foil test frame and allow it to dry.
7. The film must be perforated. Otherwise, the device must be checked by the service centre.
   of BANDELIN electronic GmbH & Co. KG is recommended.
8. Archive the film with the test date and serial number of the ultrasonic bath and the previously
   selected conditions and duration. In addition, the documentation template for the slide test
   filled out and archived.
9. Rinse the oscillating tank thoroughly to remove any film particles that have been loosened.
   
   Suitable foil test frames can be ordered from BANDELIN electronic GmbH & Co. KG, suitable foil test frames can be ordered.
   The foil test frames are suitable for a wide range of
   of tank dimensions. For carrying out the test
   aluminium foil is also required,
   This is not included in the scope of delivery.

You will also find the documentation sheet for download in our Knowledge Base.

Folio Test Documentation Sheet

The BANDELIN Foil test documentation sheet facilitates the documentation of the functional test of an ultrasonic bath

As an alternative to the foil test, the hydroacoustic measurement method according to
IEC TS 63001   
Further explanations of this measuring method can be found at cavispector.com.