LIQUID SURFACE LEVEL SENSOR AND LUBRICATING OIL SUPPLY DEVICE

To make it possible to detect at least an upper level and a lower level of a liquid surface substantially with one float switch.SOLUTION: In a liquid surface level sensor 30 comprising: a float 320 that has a permanent magnet and moves up and down along a vertical float guide shaft 310 according to variations in the level of a liquid surface to be detected; and a lead switch 311 that is arranged within a movable range of the float and is turned on or off by approach or separation of the permanent magnet, the number of both the float 320 and lead switch 311 is one, and the float 320 is provided with more than one, such as two permanent magnets 321, 322 along the axial direction of the float guide shaft 310.SELECTED DRAWING: Figure 1 【課題】実質的に一つのフロートスイッチで液面の少なくとも上位レベルと下位レベルを検出できるようにする。【解決手段】永久磁石を有し被検出液面のレベルの変動に応じて垂直のフロートガイド軸３１０に沿って上下するフロート３２０と、上記フロートの可動範囲内に配置され上記永久磁石の接近離反によりオンオフするリードスイッチ３１１とを含む液面レベルセンサー３０において、フロート３２０とリードスイッチ３１１はともに一つであり、フロート３２０にフロートガイド軸３１０の軸方向に沿って複数個、例えば２つの永久磁石３２１，３２２を設ける。【選択図】図１