BUCHI Vacuum Controller V-855 - Manual (Page 38)

6 Operation
38 V-850/855 Operation Manual, Version E
Edit solvent
When you select this menu and press the Forward button, the following screen appears:
Here you can define up to 15 new solvents, change and delete a self-defined one and determine
whether the predefined solvents should be shown or hidden in the solvent library.
When you want to define a
new solvent or change an existing solvent, press the corresponding
Forward button. The following screen appears:
Use the selection knob of the vacuum controller to define the b-coefficient and the boiling point of the
new or modified solvent. Turn the knob to the right to increase the value or to the left to decrease the
value and confirm your settings both times with
OK.
The b-coefficient is used to calculate the desired boiling point T
p
at a given pressure p:
T
p
=
T
s
(3.006 – log p) b + 1
where:
T
s
= boiling point (°K) at a pressure of 1013 mbar (normal pressure)
T
p
= boiling point (°K) at pressure p (mbar)
You can now save the new or modified solvent under a certain name. When you press the Forward
button, the following screen appears: