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The continuous movement of the diaphragm assures continuous tangential flow through
the filter. The maximum stroke of the diaphragm assures maximum mixing and minimizing
“dead space” retention within the system.
Control of the XCell™ ATF System is based on the above two rules.
The XCell™ ATF System, having a constant pump volume, allows the controller to calculate
the Diaphragm Pump cycle time based on a user’s flow rate selection, according to the
following relationship:
The programmed pump displacement volumes, with no pressure difference across the
diaphragm, are:
XCell™ ATF 4 System 0.44L
XCell™ ATF 4MC System 0.44L
XCell™ ATF 6 System 1.2L
XCell™ ATFXCell™ ATF 10lgcy System 5.1L
XCell™ ATF 10 System 6.0L
See also Appendix 1. Cycle time vs. Flow rate.
Therefore, selection of a Flow Rate (L/min) by a user, using an XCell™ ATF System with a
known Pump Displacement Volume (L), it is possible for the C410v4B controller to calculate
the Pump’s Cycle Time, Calculated CT.
At the end of each pump cycle, the Actual Cycle Time, Actual CT, is compared to the
Calculated CT. The controller then uses the error between the two values to correct Actual CT
to equal Calculated CT. Similarly, the C410v4B controller also allows the user to enter XCell™
ATF System cycle time (sec) directly to control flow rate; again, at the end of each pump cycle,
the Actual CT is compared to the Calculated CT. The C410v4B controller is designed to
maintain the set flow rate automatically during the Pressure and Exhaust pump cycles. Based
on an entered set point in either Liters per minute, LPM, or Time, in seconds, the C410v4B
controller will continually adjust the Pressure and Exhaust flow rates to match the entered set
point flow rate.
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