Precision Digital’s full-featured, loop-powered meters with two open collectors and two solid state relays, are also capable of performing lead-lag pump alternation.
For pumps used in applications such as tank level, pump alternation can be used to turn the pumps on and off to prevent excessive wear and tear.
Precision Digital loop-powered meters are unique because you can program pump alternation based on level and time.
For example, applications that involve tank level can be programmed to alternate with each alarm occurrence, such as a high alarm and a low alarm.
For applications where pumps remain on extensively, the Alternation Time Parameter on these loop-powered meters can be programmed to set a period of relay on-time after which the relays should alternate.
For example, if the alternation time is set to 1 hour, the active relay will deactivate after 1 hour of runtime and the inactive relay will activate. See steps 3 and 4 in the pump control example below.
Precision Digital loop-powered indicators that are capable of performing pump control include the PD6600 Loop Leader series, launched in 2018; and coming in 2022, the New PD4 Loop Leader+, PD6900 ProtEX+, and PD6900 VantageView+.