Duplex Demand Dose Controls

Overview

Duplex dose on demand panels operate dual pumps for residential and light commercial dose on demand systems. Duplex pump systems are used when immediate backup for a failed pump is desired. If one pump fails, the second pump will activate upon rising water level and provide simplex pump operation until the failed pump is repaired. The amount of storage above the alarm may be reduced since the second pump is readily available. Pumps are alternated as lead pump after each pumping cycle to provide even pump wear. Each pump operates on either two floats (one differential, one narrow-angle) or three floats (narrow-angle) switches for pump control, plus one (narrow-angle) float switch for alarm indication. Alarm indication may be combined with lag pump float switch for immediate pump failure notification or separated for applications where heavy flows are expected and not desired to be alarmed.