V S A Q u i c k S t a r t G u i d e
Fi
gure 3: Tank fill extension
• Remove the black plug on the clear plastic tank fill
extension located on the back right of the VSA.
(see Figure 3: Tank fill extension). Fill the tank with
deionized water until full. Reinstall the black plug
once finished. It is not necessary to tighten the lid with a
screwdriver, hand-tight is good enough.
• To remove the water from the water tank, the water tank
drain plug is used.
• Figure 3 shows the location of a filter that will need to be
removed from time to time when dust builds up on it. The
housing around the filter is a snap on housing that is easily
removed.
Water Fill Plug
Water Tank Fill Extension
Upper Horizontal Drilled Hole
Water Tank Drain Plug
Fan Filter
V S A Q u i c k S t a r t G u i d e
10-600 ml/min can be selected. Higher flow rates will
speed up the test, but may result in lower data
resolution and non-equilibrium conditions. The
default value of 100 ml/min is suitable for most
products.
•
To choose to include a timeout setting, press with
“Timeout” highlighted, and then cycle to the desired
value using the up and down arrows. Any value
between 5.0 min to 30 days can be selected. The
timeout determines the maximum time allotted to
move from the starting
a
w
to the final
a
w
(DDI only)
and is optional. The default value is off, which means
there is no timeout value.
•
To choose to have the isotherm loop, press with
“Loop” highlighted to toggle between on and off.
Turning loop on causes the isotherm to automatically
return to the start
a
w
(with the same settings) once
the final
a
w
has been achieved. This would create
both an adsorption and desorption curve (or vice versa
depending on the starting direction).
• For DVS method
•
To choose the starting
a
w
, press with “Start”
highlighted, and then cycle to the desired value using
the up and down arrows. Any value between 0.03
and 0.95
a
w
can be chosen including “current”.
Choosing “current” means that the stage will start at
the initial
a
w
of the sample. Press when finished.
•
To choose the final
a
w
, press with “Final”
highlighted, and then cycle to the desired value using
the up and down arrows. Any value between 0.03
and 0.95
a
w
can be chosen including current
(see“current” definition above). Selecting a final
a
w
that is lower than the starting
a
w
will result in
desorption, while selecting a final
a
w
higher than the
starting
a
w
will result in adsorption. Press when
finished.
•
To choose the temperature of the stage, press with
“Temperature” highlighted, and then cycle to the
