These requirements cover indicating pressure gauges of the elastic element type usually employed in the high-pressure side of regulators or reducing valves used on compressed gas containers or cylinders of oxygen, hydrogen, nitrogen, and other gases. Such gauges usually have pressure ranges of 0 - 1500, 0 - 2000, 0 - 3000, or 0 - 4000 pounds per square inch (psi) (0 - 10.34, 0 - 13.78, 0 - 20.68, or 0 - 27.56 MPa).
UL 404-2005由美国保险商实验所 US-UL 发布于 2005-01-31。
UL 404-2005 在中国标准分类中归属于: Q82 供气器材设备,在国际标准分类中归属于: 17.100 力、重力和压力的测量。
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