b. Directional Arrows – Navigate throughout menu items by highlighting with directional
arrows
c. Enter – Select highlighted menu items and input information
d. Start/Pause – Start/Pause main pump from any menu
e. Tare/Alarm Acknowledgement – When held down, will tare pressure transducer values—
during an alarm, will acknowledge alarm
7.10.2 Main Screen
a. Current Pump Mode – Formatted as “Spectrum: (Pump Mode),” allows user to see the
current Pump Mode the TFF system is in
b. Pressure Readings – The current values read by any connected Pressure Transducers.
Preferred unit of measurement can be selected in Hardware Setup
i. Feed Pressure – Symbolized as Pf
ii. Permeate Pressure – Symbolized as Pp
iii. Retentate Pressure – Symbolized as Pr
iv. TMP (Transmembrane Pressure) – Calculated measurement of the average of the Feed
and Retentate pressures subtracted by the Permeate pressure
NOTE: Please take care to understand the following in regards to how pressure transducers are read
by the system: When the TFF system is turned on and no pressure transducer has been plugged
Into a port, the empty pressure transducer port will display dashes as readings. When the TFF
system is turned on and a pressure transducer has been plugged into a port, the occupied
pressure transducer port will display a value. When the TFF system is turned on, a pressure
transducer is connected, and then the pressure transducer is disconnected or becomes faulty,
the port will display stars. TMP calculations assume that if a pressure transducer is not
connected or faulty then the reading is 0.
If the pressure sensors are plugged in after the system is on then there will be an offset of
~14.5 psi (1 bar). Before starting the process tare the pressure sensors to zero by holding
down the Alarm Off button for 3 seconds
c. Settings Menu – Symbolized as a wrench icon; entering this menu allows the user to change
the TFF system's settings
d. Pump Direction – Represented by an arrow that denotes whether the pump turns Clockwise
(CW) or Counterclockwise (CCW)—pressing Enter on this icon will change the pump
direction
e. Tubing Selection Menu – Represented by a number (the current selected tubing size) and a
small “c” (only when current selected tubing size has been calibrated); entering this menu
allows the user to change the tubing selection or set pump to RPM mode (can not be
calibrated)
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