Automatic
Duplex Pump
Controller,
Option 345
Duplex pump options are used to in-crease the reliability of a day
tank system through the addition of a second, back-up pump and
level control. In a duplex system, one pump is designated the
“lead” pump and the other is the “lag” pump. The lead pump
automatically refills the day tank over the tank’s normal operating
range of 50% to full. Normally, once the tank has been initially
filled, the fuel level should never drop below 50%. Less than 50%
is indicative of either a failure of the lead pump or consumption in
excess of pump capacity. The lag pump and its separate level
controller, acting as a backup senses a drop in fuel level below 50%
and starts the lag pump, which then continues to run, along with
the lead pump, until the tank is full. Multi-function duplex pump
controller system providing selectable operating modes, including:
• Automatic lead pump alternating with automatic lag pump
back-up
• Automatic twin pump operation (both pumps run
simultaneously) automatic level control back-up
• Manual operation
Basic System includes the following:
• All controller features
• Manual off Auto Switch (1 per pump)
• Pump running indicators for each pump
• Two pumps, each with check valves
Operation:
With the Duplex switch in the Alternate position,
Pump 1 will start at 50% and shut off at the 90% level. For
utilization of both Pump 1 and Pump 2 simultaneously, switch to
Both positions. In this position Pump 1 and Pump 2 will start at
the 50% level and shut off at the 90% level.
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