1250E & 1500E Electric Pump
Operating Manual
CP/MAN-PRD-1215E REV. 02 EFF. DATE: 12/15/12 Page 4 of 13
2.3. CheckPoint recommends use of a calibration gauge for your assurance of proper pump function
and chemical delivery rate. Refer to Section 11: Setting and Adjusting the Pump Delivery Volume
on page 8 for more information. The proper position of the calibration gauge (labeled #5) is shown
in Figure 1.
CAUTION: IT IS NECESSARY TO ATTACH A VENT TUBE TO THE TOP OF ALL
CALIBRATION GAUGES, CHEMICAL TANKS, AND TANK LEVEL GAUGES. THE
HEIGHT OF THE TOP OF EACH VENT TUBE SHOULD ALWAYS BE GREATER
THAN THE HIGHEST POSSIBLE LIQUID LEVEL IN THE SYSTEM, AND THE TUBE
SHOULD HAVE MEANS TO PREVENT WATER ENTRY, SUCH AS A 180 DEGREE
BEND.
2.4. This pump does not require flooded suction or positive chemical pressure to prime, and can
therefore be mounted above the chemical container. For a chemical with water-like viscosity, the
pump will pull air out of the chemical line and prime from up to twelve feet above the liquid level in
the tank. This feature is dependent upon proper packing adjustment and adherence to all points
made in Section 2.5 below.
2.5. All valves, fittings, and piping between the source of chemical and the pump’s suction check valve
must be 100% bubble-tight and fully compatible with the chemical being delivered and with each
other. Failure to adhere strictly to this rule will lead to gas build-up in the chemical head and loss
of prime. specifically:
2.5.1. Any fitting or screw-on joint without Teflon™ tape or other acceptable joint sealant may allow
air at atmospheric pressure to enter the suction tubing, even if no chemical leakage is
visible.
2.5.2. Dissimilar metals, when joined together in the suction pipe work may react with each other,
creating gas bubbles that will end up being carried into the pump head. CheckPoint
generally recommends all suction components, including all tubing, piping, fittings, and
valves, be of similar material, preferably stainless steel or other chemically resistant metal.
2.5.3. Incompatibilities between the chemical and the metallic elements in the suction pipe work
can also create such gas bubbles. In particular, some acids require Hastelloy™ or PVC
fittings and tubing, while other chemicals may only require 316 SS.
2.6. Always check to ensure that all process block valves are closed prior to disconnecting or re-
installing any chemical injection pump. There should always be a block valve placed between a
properly installed pump and the process flow and the chemical supply. Conversely, while the
pump is running, all such block valves should always be open.
2.7. To ensure sufficient flow rates of chemical and minimize pressure drop through the lines, all
suction lines should be at least 3/8 inches diameter and all discharge lines should be at least ¼
inch diameter. Multiple pump installations and for viscous chemicals require additional allowances.
Contact CheckPoint or your authorized CheckPoint distributor for design assistance.
2.8. Pulsation dampeners are sometimes specified in systems utilizing low-flow 1250/1500 Series
CheckPoint pumps. CheckPoint does not recommend their use because the low flow rates of all
1250/1500 Series pumps do not generate harmful pulsation.