normally open
normal open（常开状态）在警戒状态，系统报警输出部件接点是“开路”的状态。
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触点处于常开状态，即阀瓣关闭时，电控装置触点闭合，在通电状态下给出电信号。
The contact point is in a normally open state, namely, while the disc is closed, the contact point of the electric control device is closed, and in a power-on state, it sends out electric signals.
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