Technical Note
Technical Note: PendoTECH Process Control Systems: Pump Calibration
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PendoTECH Process Control Systems: Pump
Calibration
1. Introduction
The PendoTECH Filter Screening System (NFF) and TFF Process (TFF) allow users to automatically
control flowrates throughout the duration of an experiment or process. Any pump capable of accepting a
remote-control signal can be interfaced with PendoTECH control systems. PendoTECH systems control
pumps by sending an analog signal which is proportional to the flowrate entered by the user on the
system’s graphical user interface (GUI). The analog output is scaled linearly from the pumps minimum
flowrate to its calculated maximum flowrate. The following note describes the process of configuring a
pump with its nominal flow values and making any necessary adjustments to compensate for the inherent
inefficiencies associated with pump technology.
2. Connecting Pumps
a. PendoTECH NFF System
The PendoTECH NFF
system is capable of
independently controlling four pumps simultaneously. A
custom cable is included with purchase of the system that
must be specified to match the manufacturer of the pump
to be used with the system, i.e. Masterflex or Watson-
Marlow. The four pumps must also be of identical make
and model in order to be used simultaneously. The use of
an adapter cable is available, upon request, if there is a
need to use a pump of different make and model. An
example of a Masterflex pump cable is shown at right and
the pump cable input is called out in the figure below.
Figure 2.1 Back Panel of NFF Control System
b. PendoTECH TFF System
The PendoTECH TFF system can control up to three pumps simultaneously, specifically a main
circulation pump, a diafiltration pump, and a Filtrate/Permeate pump. Unlike the NFF system, the
pumps being used on the TFF system do not need to be of the same make and model. However, it
is important to note that the connection cable between the control system and pump will vary
between different model pumps The pump inputs for the TFF system are called out below.
Note - Only one of the following inputs will be used: Circulation Pump/Circ Pump Alternate
