Software features Chapter 3
Hydro 2000G/S Page 3-7
Continuous (from start) – ultrasound is active throughout the measure-
ment. Ultrasound will start after the electrical background is complete. The
stabilising period will add a delay between the electrical background and the
optical alignment. During this delay ultrasound will be operating, allowing
bubbles to be driven from the dispersant.
Tip displacement slider
The tip displacement sets the power of the ultrasonics. Moving the slider to 100%
gives full power ultrasonic dispersion.
Pre-Measurement Delay
A pre-measurement delay can be added before the measurement to allow thermal
equilibration to occur after ultrasound has been applied. If this is not done the anal-
ysis may show the presence of large particles which are not in the sample. This is
caused by the refractive index differences observed in the sample cell when the dis-
persant is not equilibrated. Choose a delay sufficiently long enough for adequate
thermal equilibration to occur.
To set the delay, highlight either the minutes or seconds in the Delay period box,
then use the selection arrows to alter the time; alternatively the time can be typed
in. A delay of between 0 and 59.59 minutes can be chosen.
Tank Fill options
The user can fill the tank with dispersant manually or automatically. For the tank to
be filled automatically, the dispersant must be plumbed into the dispersant inlet
port on the rear panel; a solenoid valve then controls the flow into the tank.
If, however, a solvent is to be used as a dispersant, it is unlikely that this will be
plumbed into the dispersion unit. Here select Manual. This switches off the sole-
noid valve and the tank can be filled by hand. (This means that, if the unit is con-
nected to a water supply, the dispersant inlet does not have to be disconnected
during a manual fill). The software states when to fill the tank during an SOP
measurement.
MAN0385-1.0 Hydro 2000G-S.book Page 7 Friday, March 16, 2007 4:02 PM
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