This preface is included for information and is not a part of (R1992). This standard has been prepared as part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static, but should be subject to periodic review. Toward this end, the Society welcomes all comments and criticisms, and asks that they be addressed to the Secretary, Standards and Practices Board, ISA, 67 Alexander Drive, . Box 12277, Research Triangle Park, NC 27709, Telephone (919) 549- 8411, e-mail: standards@
