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Choose between variable speed and fixed  speed diaphragm pumps.  Variable Speed  Models    (continuous  pulse free output)  Continuous pumping, even while adjusting the percentage  of output. See image below. The variable speed pump requires the use of brushes on  the DC motor. Excellent brush life expectancy (2000 hours). Extra set of  brushes included with every pump. The Model V (digital display) ships with built in  compatibility for External input. The pump can be controlled by  our F-2000 paddlewheel flowmeter for true proportional feeding.   Graphical representation of the  variable speed diaphragm pump injection characteristics. Note: Your chemical or solution is mixed in the fluid.  This image is only illustrating the feed characteristics.  Fixed Speed  Models     (intermittent cycle time output)  You control the pumps feed by using timers (built-in or  external). See image below. All C-1100 fixed speed outputs can be adjusted by: Selecting the pumphead diaphragm size. Manual stroke length adjustment (cam  style). Choosing the desired RPM (revolutions per minute).   Graphical representation of the  fixed speed diaphragm pump injection characteristics. Note: Your chemical or solution is mixed in the fluid.  This image is only illustrating the feed characteristics.  Can't find what you're  looking for?Tell us what  it is so we can add it to our  website.   Caution: Always wear protective clothing, face shield, safety glasses and gloves when  working on or near your metering pump. Additional precautions should be taken depending on the solution being  pumped. Refer to MSDS precautions from your solution supplier.   Note: All  diagrams are strictly for guideline purposes only. Always consult an  expert before installing the Chem-Feed/FlexFlo pump on specialized systems. The Chem-Feed/FlexFlo should be serviced by qualified persons only.