报警输出：常开常闭信号，控制排风扇，电磁阀信号。
Alarm output: frequent on or off signal, control exhaust fan, electrical magnetic valve signal.
带有信号输出端口：由电子控制主板里的常开、常闭、公共三个端口引线可外接电磁阀或增压泵。
S with signal output port: by electronic control in the mainboard to often open and closed, public three port fuses can external electromagnetic valve or booster pump.
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