A professional who tests compressed gases for moisture content, purity, ratio of gases in mixture, and cylinder pressure, using standard testing equipment and following specified procedures. Respnsibilities include:

• Drains gas samples from tanks, or rolls cylinders to test station.
• Adjusts test equipment, such as volumetric moisture tester, burette, conductometer, and pressure gauges, according to type or mixture of gases as shown on chart.
• Records test procedures and results in log.
• Prepares and places identifying tags on cylinders or tanks.
• Notifies supervisor of deviations from specifications.
• May test accuracy of calibrations on pressure gauges, using dead-weight tester.
• May mix gases according to customer specifications.
• May vaporize liquid gases and fill tube trailers.
• May measure percentage of carbon monoxide in truck cabs, using automatic gas-metering device or by spraying chemical from syringe into atmosphere and matching degree of discoloration against color chart.