In today's modern manufacturing environment, controlling the flow rate of fluids into and out of tanks, as well as the quantity in the tank at any given time, is essential. Utilizing a combination of controls, electronics, and software, an effective means of level regulation has been devised. 

Control of the plant uses a combination of, solenoid valves to control flow rates in and out, flow meters that precisely determine the amount of fluid transferred, level sensors to provide a means of determining quantized water level, and the recently marketed M68hc11 microcontroller to compute and generate control inputs. A combination of fault detection warning of system malfunction and PID control algorithm is used to adjust the duty cycle of solenoids to maintain level control. A computer terminal is used to interact with the system, download software into the microcontroller and provide input/output information on a CRT. The system is designed for an operating temperature of 0o to 180o F.
 

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