Vacuum Pump System SC 920G
Design and Function
Translation of original Operating Instructions, English, KNF 121308-121311 07/18
13
5.2. Vacuum pump system functions
The vacuum pump system can be operated in four different modes:
Evacuate
The vacuum pump system evacuates a vacuum chamber with
adjustable pump capacity.
Pressure control
The vacuum pump system controls system pressure to the set-
point pressure value (constant pressure).
Automatic
The vacuum pump system independently finds the sample's
vapor pressure and adjusts process pressure accordingly.
Function
The vacuum pump system controls pressure according to the
entered pressure curve. Up to 10 different pressure curves can
be stored. The following process parameters can be entered:
−
Setpoint pressure at various time points after starting the
process
−
Coolant valve (accessory) ON and OFF with time point
after start of process
−
Option "Jump" with time after the start of the process:
The system evacuates/ventilates to the required pressure
as quickly as possible.
−
Option "Automatic" with time after the start of the process:
Automatic detection of the boiling pressure
If the set limit pressure is reached without a vapor
pressure, the program goes to the next function step.
−
Option "Automatic Plus" with time after the start of the
process:
Automatic detection of the vapor pressure with subsequent
pressure reduction.
At any time during an active process, you can switch to
manual
process control
. Functions for Evacuate and Pressure control will
be available simultaneously. When activating manual process con-
trol, the current actual pressure will be adopted as the first setpoint
pressure. In other words, process pressure will be initially "frozen"
at the current value.
The operating modes can be
combined in any way
for the pur-
poses of intelligent process control. For example, after successful
boiling point detection in the automatic mode, the following opera-
ting modes are available for specific distilling off of the solvent
recovered:
Evacuation
(constant vaporization rate for optimum condenser capacity
utilization)
Function
(Following a preset pressure ramp provided in order to attain a
separation from components with higher boiling points)
