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Duplex panels are utilized to control two pumps simultaneously. These panels are often configured such that each pump will take turns as the primary pump. This means that the control panel will alternate which pump will be activated first for each cycle.

Control panels have two main functions. Their first function is to provide a location to joint electrical equipment to a power source. To do that safely, these units are weather resistant to protect their electrical circuits from the elements. Their second function is to organize and manage the systems they power. Various models will have different approaches for the second function, but all control panels will serve those two functions.

Lift stations are the most common location for these control panels. These panels allow the station to alternate between pumps, so that one pump does not wear significantly sooner than the other. Additionally, these control panels can activate the second pump if the flow rate into the system is too fast or if the first pump has failed. This allows the lift station to continue to accommodate high flow rates and continue to operate after a pump malfunctions.

Control panels that do not use a timer for their effluent pump are called “on demand” panels. This is because the pump is activated whenever it is needed. A float switch is most often used to activate and deactivate the pump.

Dosing timers are the most common type of timer found on duplex control panels. That type of timer allows the operator to control how long the pumps are activated and how long they are deactivated. The dosing timer will allow power to the pumps for a set interval and disconnect power from the pumps for a prescribed amount of time.