Sonics VC750 (Serial No. "Y through "AB")" - Manual (Page 13)

1. Using the fittings on top of the converter, circulate dry compressed air through the
converter to cool the converter.
2. Immerse the probe into the liquid. Always immerse the probe deep enough below
the surface of the sample to inhibit aerosoling or foaming. Foaming substantially
reduces cavitation. Processing at a lower power setting without foam is more
effective than processing at a higher power setting with foam. Decreasing the
power, increasing processing time and lowering the temperature of the sample will
usually prevent aerosoling and foaming. Do not use any antifoaming agents or
surfactants.
NOTE
The probe is tuned to vibrate at a specific frequency. If the resonant frequency
of the probe has changed, due to cavitation erosion or fracturing, a minimum
reading will not be obtained. If an overload condition exits, or if minimum
reading cannot be obtained (less than 20%) when the flow cell is empty or when
using a probe without the flow cell and the probe is in air (out of the sample),
check the instrument without the probe to determine if the probe has failed or
is out of tune. If minimum reading is obtained using the converter without the
probe, the probe is defective and should be changed.
A loose probe will usually generate a loud piercing sound.
Refer to Section III if an overload condition exists.
10
NOTE
If the START key is pressed and the time limit has not been set, processing will
remain uninterrupted until the STOP key is depressed.
If the START key is pressed and the time limit has been set, processing will
remain uninterrupted until the set time limit expires, or the STOP key is pressed
– whichever occurs first.
If a footswitch is use, and the time limit has not been set, processing will remain
uninterrupted as long as the footswitch is depressed.
If a footswitch is used, and the time limit has been set, processing will remain
uninterrupted until the time limit expires or the footswitch is released –
whichever occurs first.
The START key and footswitch are mutually exclusive. If the process is initiated
by the START key, the footswitch becomes inoperative. If the process is initiated
by the footswitch, the STOP key becomes inoperative.