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Technical Note
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
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.
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
Technical Note: PendoTECH Process Control Systems: Pump Calibration
Revision 0
Page 1 of 5
NFF
system
is
capable
Figure 2.1 Back Panel of NFF Control System
of
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Related Manuals for PendoTECH NFF
Summary of Contents for PendoTECH NFF
- Page 1 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).
- Page 2 (RPM) of the pumps drive and the amount of liquid that is moved per revolution. The first parameter is labeled in PendoTECH control systems as Max RPM and the second is labeled as mL/rotation. These parameters must be input on the “Maintenance View” tab of the control system software each time a new pump is connected to the system.
-
Page 3: Flow Verification
The following table lists some of the most popular nominal pump calibration paramters for PendoTECH’s standard offering of pumps used with either the NFF or TFF control system. As shown below, the mL/rot parameter for peristaltic pumps is dependent on tubing size while it is constant for diaphragm pumps irregardless of the size of tubing connected to the inlet/outlet. - Page 4 It is important to note that only the ml/rot value should be changed and not the Max RPM. If necessary this routine can be performed for each pump operating as part of the system. In the case of the NFF, different ml/rot values can be entered for each pump by selecting custom settings then tweaking the parameter accordingly.
- Page 5 Technical Note must develop a single or multi-point calibration to define the relationship between RPMs and flow which is defined by mL/rotation factor. Please visit PendoTECH.com or contact PendoTECH customer service if any further information is required. 5. Appendix Flow veritication Flowchart...