Which test method is utilized to measure the air content in SF6 gas?

The test method utilized to measure the air content in SF6 gas is ASTM D2685. This standard specifically outlines the procedure for determining the amount of air present in sulfur hexafluoride gas, which is crucial for ensuring the purity and effective performance of SF6 in various applications, especially in electrical insulation.

SF6 is a gas widely used for its excellent insulating properties, and any contamination by air can affect its performance and increase the risk of electrical breakdown. Therefore, accurately measuring the air content helps in maintaining the gas's integrity and ensuring safety in equipment that relies on SF6.

In contrast, the other test methods listed do not pertain specifically to measuring air content in SF6. Their applications may relate to different materials or properties, thus making them unsuitable for this particular measurement.