Grant Instruments XUBA Series - Manual (Page 10)

XUBA Series 29667 V1
Operating Manual
8
Technical information
The need to degas
In order to allow optimum ultrasonic activity, the gases present in ordinary tap water
need to be driven out of the cleaning solution.
The time needed to degas the liquid varies depending on the amount of gas present in
the liquid and the quantity of water in the tank. Grant recommends a degas period of
at least 10 minutes.
During the degas cycle, you will see bubbles of gas forming on the inside of the bath,
and slowly rising to the surface. Degassing is complete when you can no longer see
these bubbles. Another indication that the liquid in the bath has degassed is an in-
crease in the appearance of „cold boiling‟ at the liquid surface.
Once the liquid is degassed, the bath is ready for use.
The effect of heat
Heating the liquid in the bath will aid
the cleaning process.
Normally a temperature of between 30
to 60°C is sufficient to accelerate the
process. You will see from the graph
that optimum cleaning will be obtained
at 60°C.
If you are using your bath to clean medical equipment, it is recommended to limit the
fluid temperature to 35°C. This will avoid “baking” proteins.
Ultrasonic activity itself will heat up the liquid at a rate of approximately 10-15°C per
hour if in continuous use. In order to heat the fluid in the tank at a faster rate, it is rec-
ommended to run the ultrasonics as well as turn on the heating.
Cleaning time
Cleaning time will depend on application, type and amount of contamination. General
light contamination should be removed in less than 10 minutes.
An indication of cleanliness is when stains are no longer visible, and contamination no
longer appears in a stream from the item being cleaned.
Average power
0
20
40
60
15 25 35 45 55 65 75 85
Temp (Deg C)
P
o
w
er
(W
at
ts
/I
n
ch
^
2)
Av Power
-3dB point