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Crews tackling installation or replacement of natural gas mains need to purge the lines with an inert gas to eliminate the combustion hazard. Purge testing before work begins requires a gas detection device that won't be overwhelmed or damaged by the high gas levels found in this type of work. It's also important to realize that many gas detection sensors require oxygen for accurate measurements. Nitrogen is the gas most often employed to displace the natural gas when servicing main lin …