继电器内的浮控开关发动报警信号。
A float operated switch in the relay is used to initiate an alarm signal.
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控制器的一个重要功能是提供报警继电器触点。
An essential function of the controller is to provide alarm relay contacts.
还继电器主动报警。
Also Relay Active annunciator.
还主动报警继电器1。
Also Relay 1 Active annunciator.
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