Precision Digital PD6000 - Manual (Page 61)

Model PD6000 Analog Input Process Meter Instruction Manual
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3. If the backup pump is not able to keep up, and the level reaches
7000 gallons, relay #4 transfers and starts the main pump as well.
4. Relay #2 trips the High Level Alarm at 7500 gallons and resets at
6900 gallons.
5. Relay #1 trips the Low Level Alarm at 495 gallons and resets at 750
gallons.