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The purpose of this VI is to calculate the rpm speed of the pump. The rpm will set the flow rate supplied to the system based upon the tubing size. The computer will calculate the speed of the pump, but requires that you make two additional set points.

Create two new set points:

• Flow Rate Mixing Pump
• Tubing Size Mixing Pump

Note: Put your set points in order of how they are calculated

Create two new set points:

• Flow Rate Mixing Pump
• Tubing Size Mixing Pump

. If you for example put the value for tubing size before the flow rate value, the computer would calculate the pump speed putting in the tubing size value in its flow rate calculation, and the flow rate in its tubing size calculation.

Enter in a value of 40 for the Flow Rate Mixing Pump. You can add units of mL/min in the "Units" section if you wish, but these do not affect calculations.

Enter in a value of 18 for Tubing Size Mixing Pump. For more information about tubing sizes for peristaltic pumps or setting up persistaltic pumps, click here.

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Now click back on you "Mixing Pump Speed" set point. For this set point, there are two required set points that you just created to make this calculation. Under the "selected set points" tab highlight "Flow Rate Mixing Pump" and "Tubing Size Mixing Pump."

Ensure that "code match" and "data match" are both green and that the calculated value agrees with the one shown in the figure below.

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