Branson 1800 Operator's Manual page 46

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Solution Temperature Measurement
The following instructions provide an accurate method to obtain
consistent thermal measurements using a calibrated temperature
measurement instrument. These readings can be used for cleaning
process control or to verify the accuracy of the CPXH temperature
readings.
Step Action
1 Ensure that sonics and heaters are off.
2 Stir the solution for 15 seconds to ensure thermal uniformity.
3 For CPXH models, wait 2 minutes after turning the unit on
before taking measurements. This allows for the display to be
properly updated.
4 Suspend a thermocouple in the bath without allowing the probe
to touch the tank walls.
Solution activity - the amount of visible activity is not necessarily related
to optimum cavitation for cleaning.
Degassing 1 - fresh solutions contain many dissolved gases (usually air),
which reduce effective ultrasonic action. Although solutions will naturally
degas over time, using Degas Mode speeds up the degassing process.
Solutions that have been sitting unused for 24 hours or longer have
reabsorbed some gases.
Degassing 2 -degassing mode is also used where gas has to be
removed from liquids or samples.
Heat - increases the chemical activity of cleaning solutions.
Solvents - never use solvents. Vapors of flammable solutions will collect
under the unit, where ignition is possible from electrical components.
Surface tension - can be reduced by adding solution to the bath.
Reduced surface tension will increase cavitation intensity and enhance
cleaning.
41 Operating Your Ultrasonic Bath
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