Re: Can I use coil sensor in DC system? : : Can I use coil sensor in DC system for detecting LMA or LF of wire rope? : . : We know how to test wire rope with eddy current method but what is LMA and LF ? . In general you may use coil sensor. LMA - Loss of Metallic cross-sectional Area, LF - Local Flaws (see ASTM 1571-94).