How to calibrate your Masterflex L/S Variable Speed Digital Drive

This video is a demonstration of how to calibrate the Masterflex LS Variable Speed Drive.
Features of the L/S Variable Speed Drive include:
• Accurate speed control and digital display of rpm.
• Reversible motor allowing users to purge tubing before or after pumping.
• LED indicators that verify motor direction.
• Flow rates of 0.6 to 3400 mL/min with Masterflex L/S pump tubing.
• A powerful motor able to drive 2 or 4 pump heads for increased flow rates and multichannel applications.
• Membrane keypad providing easy control of speed, direction, and start/stop.
• Remote control capability via 4 to 20 mA or 0 to 10 V input signal.
John Morris Scientific is the exclusive distributor of Cole-Parmer in Australia. For more information about this and other products please view our website www.jms-cp.com.au or email us at [e-mail].

[@dion6481]

Why is the flow rate changes with the calibration? Why the 500ml/min at the start of the video changes to 542 at the end?
We are running the pump in volume dispensing mode. We adjust the flow rate at 1.5 L/min, then do a calibration (hose #36). The calibration is, say, 1.234. Why is that, if I go back to FLOW RATE, it has changed to 1.234??? And if I change the flow rate back at 1.5 L/min, the calibration ratio changes back to 1.5. Please, explain this to me.

[@hirumayoichi21]

How do I calibrate for model 77200-50?