US Patent 9297864 Current metering and abnormal event monitoring system

An MMS sensor assembly includes a U-shaped bottom housing that forms a recess in which is received a conductor whose current is to be sensed and a top housing arranged to be removably latched to the bottom housing. At least one magnetic field sensor is situated within the top housing, such the magnetic field sensor is positioned adjacent the conductor when the top housing is latched to the bottom housing, and is removable from the sensor assembly for repair or replacement. Circuitry connected to the magnetic field sensor includes a data storage device to store correction/compensation tables and/or equations for self-calibration or correction of the sensor.