This practice covers the procedure for sorting ferrous metals using the electromagnetic (eddy current) method. The procedure relates to instruments using absolute or comparatortype coils for distinguishing variations in mass, shape, conductivity, permeability, and other variables such as hardness and alloy that affect the electromagnetic or magnetic properties of the material. The selection of reference standards to determine sorting feasibility and to establish standards is also included.2
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2 General information can be found in the Nondestructive Testing Handbook, (Second Edition), Vol IV: Electromagnetic Testing, Society for Nondestructive Testing, 1986.
*A Summary of Changes section appears at the end of this standard