1250E & 1500E Electric Pump
Operating Manual
CP/MAN-PRD-1215E REV. 02 EFF. DATE: 12/15/12 Page 9 of 13
10.7. The stroke length may be adjusted whether the pump is running or not.
10.8. There are a variety of calibration gauges available, including a complete line of appropriately-sized
CheckPoint calibration gauges for every CheckPoint pump. To ensure that your pump is working
as is should and that chemical is being delivered at the rate you need, it is important to use a
calibration gauge.
10.9. Most calibration gauges are designed to read properly when one full minute of pumping has taken
place. However, if the liquid level drops too fast to allow for a full minute, shorter periods are
acceptable. Try to size the gauge so that at least a 30 second test can be made, however, or a
loss of accuracy will result.
10.10. Proper gauge placement and plumbing is important. Please refer to Figure 1 for appropriate
valving and placement, and for reference numbers as used in this section. The calibration gauge
is labeled as #5.
10.11. With the pump either running or stopped, open the Gauge Fill Valve (shown as #4 in Figure 1).
The calibration gauge (#5) should begin to fill. Continue filling until the chemical level is at or near
the top markings on the gauge, then close the Gauge Fill Valve (#4).
10.12. Now ensure that the CheckPoint pump is running. Take note of the level of chemical in the gauge
using the appropriate scale for the volume units you want to measure the pump’s output in.
Usually the calibration gauge will show liters on one scale and quarts or gallons on the other. It is
best to write down the number so that you can calculate flow accurately.
10.13. Open the Gauge Fill Valve (#4), and immediately close the Chemical Supply Valve (#1). This
isolates the pump and gauge so that the pump is being supplied directly from the gauge.
10.14. The level in the gauge should begin to fall. When the liquid level in the gauge gets near the bottom
of the gauge, or when one minute has expired (whichever comes first), stop timing, note the
ending level on the gauge, and reopen the Chemical Supply Valve (#1).
10.15. Write down the amount of time in seconds and the final gauge reading, then close the Gauge Fill
Valve (#4).
NOTE: Failure to reopen the Chemical Supply Valve will result in the pump quickly depleting
the remaining chemical in the gauge and sucking in air from the gauge, necessitating
pump re-priming.
NOTE: In cases where the chemical flow rate is extremely low, you may need to time for
longer than one minute to allow an adequate amount of chemical to move out of the
gauge.
10.16. The pumping volume (in the units specified on the gauge scale) will be given by the following
equation:
PUMPING VOLUME =
[END READING] – [BEGINNING READING]
X 60
[DURATION OF READING IN SECONDS]
NOTE: To ensure accurate stroke rate measurement, allow sufficient measurement duration.
Where possible, allow at least thirty seconds of gauge drawdown.
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