A professional who operates agitators (reaction vessels), vacuum-filtrate system, and allied equipment from instrumented control board to produce phosphoric acid by reaction of sulfuric acid with phosphate rock in continuous strong-acid process. Respnsibilities include:

• Monitors recording instruments, flowmeters, panel lights, and other indicators, and listens for warning signals to verify conformity of process conditions to plant standards.
• Starts automatic feed of phosphate rock, water, and sulfuric acid through reaction tanks, vacuum-filtrate system, and pumps.
• Turns knobs and screws on control board to regulate temperatures, weight, pressures, and flow of materials through system to effect prescribed reaction, according to knowledge of equipment and process.
• Draws samples of product at specified stages of process for laboratory analysis.
• Maintains log of gauge readings, shift production, and equipment malfunctions.
• Patrols area to inspect equipment for leaks and hazards, such as wear and pending malfunction.