Terumo Advanced Perfusion System 1 Operator's Manual page 193

Roller Pumps
Follower Operation
The follower pump speed adjusts automatically to maintain the currently set
percentage or, for select percentages, ratio according to the following formula:
Desired Follower Speed = Master Flow Rate x Ratio (%) x 10
Use the follower pump speed control knob or pump control slide bar to adjust the
percentage (%) of the master pump flow rate or speed, but not the percentage of the
follower pump flow rate or speed in the total cardioplegia delivery. For the following %
values, the setting is displayed as a ratio rather than a %:
% of Master Flow
The follower pump display shows an "F" next to the primary display. Below the "F,"
the servo control symbol is displayed indicating that the follower pump speed is being
automatically controlled. The secondary display shows the current master/follower
pump percentage or ratio. The bar graph indicates the percentage of master pump
flow or speed.
CRYST
Communications Link
Both the master and follower pump must be in Stop mode with pump safety covers
closed until the Perfusion Screen opens to permit connection between the pumps
which will be indicated by the M and F on the pump control panels. The servo control
symbol only appears on the follower pump control panel as it is the servo regulated
pump. The servo control symbol alone does not indicate connection between master
and follower pumps. If the master and follower pumps lose their connection with each
other, these pumps will automatically stop. The connection between the pumps must
be reestablished to continue operation in Master/Follower mode. Use the Master
or Follower Status subtab to reconnect the pumps. See Central Control Monitor
chapter, Pump tab, Master or Follower Status subtab section.
Master Flow Constant
Ratio Displayed
100%
50%
25%
12%
6%
0.050
F
L/min
4:1
5-26
1:1
2:1
4:1
8:1
16:1
1/4