作为控制装置中用来测试水分感应零件的配件，还需要提供正常关闭按钮和氖指示灯。 收藏。
A normally closed pushbutton and neon indicating lamp are provided as a part of the control for testing the moisture sensing components.
在打开外壳门之前，要保证开关处于“关闭”位置，否则，不能对控制装置的开关进行维护修理。
"Limited service controller" on-off "switch must be in the extreme" off "position to open the enclosure door."
在用于关闭危险设备的安全电路中，这样的信号装置互相串联地连接到安全控制器。
In a protective circuit for switching off a hazardous installation the aforementioned signaling devices are connected in series to a safety control device.
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