Gauge glass illuminators, heating or cooling jackets, expansion loop, mica shield, non-frosting extensions, etc. shall be provided wherever process service requires.

• 应在任何工艺要求的地方配备玻璃液位计照明装置，加热或冷却夹套，扩充回路，云母屏蔽，非磨砂型加长杆等等。