Leak Detection ASLD - Leak Detection Sensor Mounted in a small diameter stainless steel housing, this EPG leak detector uses stainless steel electrodes commonly to detect the presence of conductive fluids. Can be suspended in a small annular space or threaded into a pipe or container. MS6121-CX Leak Detection Sensor Mounted in a small diameter molded ABS plastic housing, this EPG leak detector uses stainless steel electrodes commonly to detect the presence of conductive fluids. Can be suspended in a small annular space or threaded into a pipe or container. MS664-CX Leak Detection Sensor EPG’s MS664-CX EPG Leak Detection Sensors are designed to be used in landfill recirculation and bioreactor systems to detect leakage. Conductance is made from probe to probe through the presence of liquid.