必须具有测量环节，以指示被测回路所控制的变量当前值。
Measurement must be made to indicate the current value of the variable controlled by the loop.
在这起事故中，低劣的控制室指示器指引电站工作职员封闭了为反应堆芯堆降温的回路。
In that case, poor control room indicators led plant officials to switch off the circuit which would have cooled the reactor core.
采用优质电子元件组装，主回路设有多重保护；照明开关、喷漆、升温喷漆、烤漆温度、时间设定、故障指示灯。
Control system: lighting switch, spray paint, spray paint of temperature, drying temperature and time setting, emergency stop, limit the warm, failure alarm.
此外，该系统面板指示灯回路的设计具有独特构思。
In addition, the design of the panel indicator circuit of the system is unique.
此外，该系统面板指示灯回路的设计具有独特构思。
In addition, the design of the panel indicator circuit of the system is unique.
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