Series QPC is used where four pumps are required to alternate operation to equalize run time on each pump. Alternating loads allows for equal wear on all pumps, lengthening their operation life. Quadraplex pump controller has five inputs, allowing the four outputs to operate properly even if one of the inputs fails to open or close. Four LED indicators show the load that is energized by the SPST output contacts. It is available in sequence-on-simultaneous-off and first-on-first-off sequence configurations.
Dwyer Instruments Inc., (800) 872-9141

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