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Operating the Pump
There are only a few controls on the control panel of the pump (see Figure 9). First, the arrows on the
right side of the pump indicate the flow when the pump is in ‘Forward’ mode. ‘Reverse’ will switch
these directions. The round toggle switch on the left side of the pump controls the direction of flow,
with the center position equal to “OFF”. Two lights indicate the direction of flow – green is forward and
yellow is reverse. The Prime button is used to turn the pump to full speed. Pushing the button until you
hear a “click” locks the pump in prime mode until the button is pushed a second time. Note that the
direction of flow in prime mode is the same direction that has been set with the toggle switch. The
speed control is the dial located under the prime button. The scale around the dial is not incremental,
meaning there is no “click” between each number of the dial (the user can set the dial to any spot
between the increments [e.g., 2 ½ or 6 ¼]). The speed control sets the rotations per minute (RPM) on
the pump head, and thus the flow rate of the sample. Use the charts on the next page to determine the
approximate relationship between the dial setting and the flow rate of the pump.
Figure 9. The C50 peristaltic pump control panel
Speed Control Dial
Toggle Switch
Prime Button