Genevac HT-12 - Heat off Elapsed Time; End of Run Elapsed Time; Controlled Pressure

Genevac HT-8 & HT-12 Series II Evaporating Systems
04-4541 Issue 1-9 – June 2008 Page 31 of 64
Heat-Off Elapsed Time
End-of-Run Option
End-of-Run Elapsed Time
End of Run Defrost and Drain
Pressure Control Regime
Full Vacuum
Controlled Pressure
Dri-Pure
NOT AVAILABLE FOR LYOPHILISATION
(Very Low rotor speed)
Variable Dri-Pure
NOT AVAILABLE FOR LYOPHILISATION
(Very Low rotor speed)
This can be in a range of 0 (lamps off for the entire
run) to 99 hours 59 minutes.
This option is the elapsed time after which the run
will be stopped.
Press ENTER and input the time after which you
want the run to stop.
This can be in the range of 1 minute to 99 hours 59
minutes.
Press ENTER to toggle between Yes and No. Only
available between linked runs and is typically used to
remove mixed solvents – See Annex A Page 55.
Press ENTER to display the Select Pressure
Control Option drop down menu.
Use the Up-Down cursor keys to select the pressure
option required.
Full Vacuum will take the chamber pressure down
to the vacuum capability of the pump.
When the Controlled Pressure option is selected,
the Controlled Pressure field will be displayed.
Move down to this field using the DOWN cursor key
and press ENTER.
Input the pressure you want the chamber to be
limited to in the range of 0 to 500 mbar.
DRI-PURE reduces the vacuum over a
predetermined period to 50 mbar, then goes to the
control pressure as set by the user.
This feature is particularly useful in preventing
bumping, (the violent boiling of solvents), resulting in
solvents being expelled, which is a source of cross
contamination of samples.
Bumping can also cause products to be deposited on
the glass lenses of the Coolheat lamps, which
eventually results in breakages.
Note that during the DRI-PURE cycle, which is
approximately 40 minutes, the Coolheat function will
be disabled.
Variable Dri-Pure allows the user the option to set:
1) The pressure at which the vacuum ramp will
start.
2) The pressure at which the vacuum ramp will end.
3) The total duration of the vacuum ramp.
4) Final Controlled Pressure.
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