Series 642
INSTALLATION
605593EC
Edition 2017-11-24
39/113
4.6.8
Pressure control configuration
Select the configuration what your application needs.
System Configuration
Constant gas flow available
Constant gas flow not
available
Tv*<= 500 sec
Tv* > 500 sec
Adaptive pressure
controller
(Refer to chapter:
Pressure controller)
Fixed pressure controller
(Refer to chapter: Pressure controller)
Fixed pressure controller
(Refer to chapter: Pressure controller)
Soft Pump
Soft Pump (Refer to chapter: Pressure controller)
Use the formula below to define the applicable pressure control algorithm.
P
SFS
•
CV
Tv =
q
L
q
L
gasflow for learn [mbarl/s]
p
SFS
sensor full scale pressure [mbar]
Tv*
Vacuum time constant [sec]
CV
Chamber Volume
[l]
Upstream
Process
chamber
Control
valve
Pump
Downstream
Process
chamber
Control
valve
Pump