Cảm biến từ cho máy chạy bộ.
磁力传感器用于跑步机，安装在跑步机滚轴附近，通过磁铁的磁场触发开关，测量电机速度。传感器线长0.6至1米，滚轴装有永久磁铁。
- The description claims that the sensor should be replaced when the belt runs normally after pressing start but stops within 5-7 seconds with an error message.
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