UL 565-1998《无水液氨和液化石油气用液位量规及指示器》

These requirements cover liquid-level gauges and indicators for anhydrous ammonia and liquefied petroleum gas (LP-Gas) for use with pressure vessels in nonrefrigerated systems in installations covered
by the following American National Standards and others:
a) Storage and Handling of Anhydrous Ammonia, ANSI K61.1.
b) Liquefied Petroleum Gas Code, NFPA 58.
c) Storage and Handling of Liquefied Petroleum Gases at Utility Plants ANSI/NFPA 59.