BANDELIN SONOCOOL 255, User Instructions, Page: 26 / 46

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4.5 Further information
4.5.1 Contact fl uid
Since inset beakers must be used in the ultrasonic bath in principle, the bath must be
fi lled with contact liquid. This contact fl uid must be able to transfer the ultrasound to the
liquid found in the inset beakers without loss, if possible. The surface tension is very high
in municipal and deionised water. Due to this high surface tension, the cavitation does
not form in the entire solution, but rather only on the oscillating tank bottom or in water
inhomogeneities, in general.
To reduce the surface tension, add a surfactant preparation that is biodegradable, easily
disposable, gentle to the material and long-lasting. We recommend TICKOPUR TR 3,
which is easily available from specialist laboratory supply dealers. Even when used for a
long period of time, this preparation does not leave behind any dirty rims or incrustations,
does not turn cloudy, and has an average service life of 5-7 days before having to be
replaced.
Note:
In order to prevent clouding or precipitation of the contact liquid when using very hard
water, the contact liquid can be mixed with deionised water.
4.5.2 E ff ect of the rubber stoppers on the oscillating tank's inlet
and outlet
Basically, only the rubber stoppers on the tank's inlet are required for fi lling and emptying
purposes . However, both rubber stoppers must be plugged in when transporting the
ultrasonic bath in order to prevent residual water from leaking out (residual water after
emptying the circular
fl ow cannot be fully avoided).
Stopper e ff ect when fi lling:
Due to the stopper, slight counterpressure in the ultrasonic bath's liquid circuit is created
during the
fi lling process . When enough liquid is present in the tank, the stopper is
removed. A pressure balance is created and the liquid fl ows jerkily up to the pump, which
can now start conveying . In this manner, air bubbles that could impair the system's
pumping e
ff ect are avoided.
Stopper e ff ect when emptying:
Use of the stopper during emptying prevents air from being pulled into the liquid circuit
through the tank's inlet, which could signi
fi cantly restrict the system's suction e ff ect and
interfere with the emptying of aggregate and pump .