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