In general, instrument boxes are not required for local transmitters.
现场变送器一般不采用仪表保护箱。
Block diagram: a diagram of a system, instrument, computer, or program in which selected portions are represented by annotated boxes and interconnecting lines.
框图：用线框把一个系统，仪器，电脑或程序的主要部份围绕，并用线把它们注的图示。
Instrument signal wiring junction boxes shall not be used for electrical cables.
仪表信号接线箱不能用于电力电缆。
Instrument signal wiring junction boxes shall not be used for electrical cables.
仪表信号接线箱不能用于电力电缆。
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