Hardware features
43
Stirrer speed control, display and motor
Turning on
With the Power and CAN cables connected, power the unit ON by pressing on the speed
control dial; pressing again will turn the unit OFF.
The Hydro SV does not need to be located into the cell bay of the optical unit before it
can be turned on. This is so the cuvette can be filled, the sample agitated and any extra
actions such as checks for bubbles, liquid levels, or the addition of more sample/dis-
persant before insertion into the cell bay.
Stirring the sample
In the SV cell a stirrer bar is placed into the cuvette, and this is used to agitate and cir-
culate the sample/dispersant mixture within the cuvette to make sure it is adequately dis-
persed prior to a measurement. The stirrer bar has a magnetic core which couples to the
magnets on the stirrer motor head. The stirrer motor then rotates the stirrer bar at a
speed determined by the SOP or the speed control dial on the front of the unit.
l The speed range is 500 to 1800 rpm.
l Press the dial to turn the stirrer on and off.
Note: The software stirrer slider bar, and the SV front panel manual control dial
are synchronized. Movement of the slider bar will alter the front panel display;
and vice-versa.
Stirrer bar care
Refer to Hydro SV procedures on page97 for details of the inspection, handling and
cleaning the stirrer bar,
Filling the cuvette
Note: The cuvette and stirrer bar must be cleaned thoroughly before first use
and before any subsequent measurements are performed. Refer to the Hydro
SV procedures on page97 for details.
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