DIN EN 50216-5:2007 电力变压器和电抗器配件.第5部分:液位计、压力装置和流量指示器、压力释放装置和脱水通气装置
Power transformer and reactor fittings - Part 5: Liquid level, pressure and flow indicators, pressure relief devices and dehydrating breathers; German version EN 50216-5:2002 + A3:2006