Pump totalizer system

A control system for controlling the pumping of liquid to or from a vessel with one or more pumps, said control system comprising:

• (a) a level sensor for determining the level of the liquid in the vessel and generating a liquid level reading;
• (b) an actuator coupled to each of said pumps for turning the pump on and off, and said actuator having a control interface responsive to control signals;
• (c) a controller coupled to said level sensor and each of said actuators, and said controller having pump control means for controlling said pumps by issuing control signals to said control interfaces in response to said liquid level readings;
• (d) said controller having totalizing means for totalizing the volume of liquid pumped in said vessel, said totalizing means comprising:
• (i) means for recording when each of said pumps is turned on and off and calculating a running time for each of said pumps;
• (ii) means for determining a first rate of change of volume when each of said pumps is turned on and a second rate of change of volume a predetermined period after each of said pumps is turned on and before each of said pumps is turned off;
• (iii) means for determining a draw down rate for each of said pumps and means for calculating the volume pumped by each of said pumps based on the running time and draw down rate for each of said pumps;
• (iv) means for summing the volume pumped by each of said pumps to produce a total volume pumped for said vessel over the duration said pumps operated.