Series GX15 Pneumatic Chemical Injection Pump
Operating Manual
CP-MAN-PRD-GX15
REV06
EFF. DATE 07/23/2019
Page 8 of 12
NOTE:
If the pump is not new, it
’
s possible for dried or solidified chemical to be present in the bleed
assembly. If your pump does not bleed when following the directions above, try cleaning these items
in solvent and replace.
2.1.6
Close the bleed screw until chemical flow through the bleed port stops. Torque the bleed screw to 10 in lb.
Reduce the stroke rate via the speed control to your desired rate.
NOTE:
DO NOT OVER-TIGHTEN THE BLEED SCREW. Tighten the bleed screw ONLY to 10 in lb max. Applying
excess torque to the bleed valve may impair future valve operation.
2.2
Setting the Pump Stroke Rate
The following directions are for setting the pump speed using a calibration gauge. There are a variety of calibration
gauges available, including a complete line of appropriately-sized CheckPoint gauges for every CheckPoint pump.
To ensure that your pump is working as it should and that chemical is being delivered at the rate you need, it is
important to use a calibration gauge.
2.2.1
Most calibration gauges are designed to read properly using a one-minute test. However, if the liquid level
drops too fast to allow a full minute test, shorter periods are acceptable. Size the gauge so that at least a 15 second
test can be achieved. Tests shorter than 15 seconds will result in a loss of accuracy.
2.2.2
Proper gauge placement and plumbing is important. Please refer to Figure 1 (#5 calibration gauge) for
appropriate valving, placement, and reference numbers as used in this section.
2.2.3
With the pump either running or stopped, open the Gauge Fill Valve (shown as #4 in Figure 1). The gauge
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.
2.2.4
With the CheckPoint pump running take note of the level of chemical in the gauge using the appropriate
scale for the volume units to be measured. Usually the 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.
2.2.5
Open the Gauge Fill Valve (#4), and simultaneously close the Chemical Supply Valve (#1, Figure 1). The pump
now draws chemical directly from the calibration gauge.
2.2.6
The level in the gauge should begin to fall. (If it does not, or if the level seems to go down and then back up
with each stroke, refer to troubleshooting in
Section 4.2.1 on page 11
). Stop timing when the liquid level in the gauge
approaches the bottom of the gauge, or when one minute has expired, whichever comes first. Note the ending level
on the gauge, and reopen the Chemical Supply Valve while closing the Gauge Fill Valve.
2.2.7
Write down the amount of time in seconds and the final gauge reading.
NOTE:
Failure to reopen the Chemical Supply Valve will result in the pump quickly depleting the remaining
chemical in the gauge and running on air, 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.
2.2.8
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]
