A professional who tests temperature of glass melting furnaces and regulates gas and air supply to maintain specified temperature, using any of following methods. Respnsibilities include:

• (1) Measures temperature of furnace sections, using optical pyrometer.
• Sights through opening of pyrometer into furnace opening and turns sleeve dial on pyrometer until color of wire filament matches luminosity of flames.
• Reads dial indicator to obtain millivolt reading and compares reading with temperature chart to determine if temperature is in accordance with specifications.
• Turns valves to adjust gas-to-air ratio and increase or decrease temperature within refractory.
• (2) Computes and plots averages of glass temperatures on graph paper from temperature charts, using pencil and template to draw lines and circles.
• Interprets graph to determine need for temperature adjustment.
• Turns valve to increase or decrease air and gas supply into burners.
• (3) Tests gas-to-air ratio of burned atmosphere, using gas analyzer.
• Inserts hose of gas analyzer into furnace and starts suction pump to withdraw sample of burned atmosphere.
• Observes dial indicator on analyzer to determine if gas-to-air ratio is in accordance with specifications.
• Turns valve to adjust gas-to-air ratio and control heat of furnace.
• Records tests, temperatures, and adjustments in log.