Abstract: A low-flow pump-off control device for deactivating a motor for a pump during conditions when a rate of supply of a source of fluid to be pumped by the pump is insufficient includes: a pipe section having an inlet and an outlet, the inlet being connectable to the source of fluid to be pumped through the pipe section; a plurality of plates disposed substantially perpendicularly in the pipe section, each of the plates defining at least one orifice through which the fluid is caused to pass; a differential pressure switch for sensing a differential pressure between a pressure upstream of a first one of the plates and a pressure downstream of a last one of the plates that is at or below a set point indicative of a predetermined low flow rate of the liquid; a first timer in communication with the switch for accumulating periods of time at which the switch senses the differential pressure; a motor activation and deactivation relay in communication with the timer for deactivating the motor when the accumulated period