对于带有过滤装置的循环润滑系统(例如液压系统、透平机组)，最佳取样点是在回油管路;如果要判断设备的磨损情况，应在滤器回油管滤器前取样;如果要评价滤器的过滤效果，需要同时对滤器前和滤器后都取样;
对于油浴润滑的设备(例如齿轮箱)等，最佳的取样位置是油箱中部，如果油箱设有取样阀，可以在取样阀处取样。应尽量避免在油箱底部取样，以免过多沉积物影响到对设备运行状态的预估与评价。
在监测过程中，每次的取样点应保持一致，并使用专门的取样器具和样品瓶，确保取样过程中不污染油品。
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