MicroCal VP-ITC User Manual page 35

Section 2: VPViewer and Origin Software
Apply To Rest – Selecting this option, you will be assigning the injection parameters for the
currently highlighted injection (in the summary table), to all ensuing injections. Likewise, editing
an injection parameter while this option is selected affects the currently highlighted injection (in
the summary table), as well as all ensuing injections.
Pipette Controls
This group of buttons control the injector movements
of the pipette. The group box is labeled Ready when
pipette controls are enabled or Busy when a movement
is currently being made. The end of a movement is
signaled by a beep and the group label, switching from
Busy to Ready
Open Fill Port
This button is used for positioning the plunger tip for loading the pipette with your sample. When
you click on this button the injector screw of the pipette plunger will retract till the plunger tip is
positioned just above the fill port of the injection syringe. This will allow you to attach the hose
of the plastic syringe to the fill port for filling the pipette injection syringe with your sample.
Close Fill Port
This button is for positioning the plunger below the fill port after filling the pipette with your
sample. When you click on the button the injector screw will extend so the plunger tip is just
below the filling port of the injection syringe. This should be done immediately after filling the
pipette syringe and before removing the hose of the filling syringe.
Purge->Refill
This button will completely extend the plunger tip of the pipette injector to inject the sample
back into the filling test tube, then raise the plunger to refill the injection syringe. When the
movement is complete the plunger tip of the injection syringe will be positioned to its original
position, just below the filling port. A beep will indicate the start of the movement a second beep
will indicate completion of the movement.
The purpose of the purge/refill procedures is to dislodge any air bubbles from inside walls of the
injection syringe (which may have occurred during the first filling) and expel them back into the
titrant solution. It is recommended to perform this procedure twice, after loading the pipette
before an experiment.
Distance (in.)
You may move the injector a set distance, either up or down, by entering the distance to be
moved (in inches) in the text box and clicking either the Up or Dn (Down) button.
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