Trident Series PD765 Process & Temperature Meters
Instruction Manual
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Pump Controller with Dual-Pump Alternation
The PD765 can be used as a low-cost pump controller when combined with a continuous level transmitter. One of the most
common pump control application is shown below: controlling and alternating two pumps. The goal is to control the level
between 1000 and 6000 gallons. The main pump turns on when the level reaches 6000 gallons and pumps down to 1000
gallons and then shuts the pump off. The next cycle, the backup pump turns on at 6000 gallons and shuts off at 1000
gallons. If at any time the active pump can’t keep the level below 7000 gallons, the other pump would come on also.
Pump Alternation Control Operation
