This can be done two ways: using a stopwatch to time the pumping of a fixed volume, or measuring the volume pumped during a fixed amount of time. Here, we demonstrate a method that can be used with any tube, including the tank level sight tube, as in Figure 2. In our example, the injection pump rate is adjusted by selecting and modifying a percentage of the maximum rated output of the pump.
- The initial pump setting (Table 1),
- How much volume is pumped per inch of calibration tube length (Table 2), and
- The fluid level difference in the tube that you should find after the calibration pump check time period if the injection pump is calibrated correctly (Table 3).