Tag: precision

New BS EN 482 2012 Edition released for Workplace exposure, General requirements for the performance of procedures for the measurement of chemical agents

BS EN 482 2012 Edition has just been released and is now available from Document Center Inc.  The new revsion, titled “Workplace exposure. General requirements for the performance of procedures for the measurement of chemical agents,” specifies general performance requirements for procedures for the determination of the concentration of chemical agents in workplace atmospheres as required by the Chemical Agents Directive 98/24/EC.

These requirements apply to all measuring procedures, irrespective of the physical form of the chemical agent (gas, vapour, airborne particles), the sampling method and the analytical method used. This European Standard is applicable to all steps of a measuring procedure, measuring procedures with separate sampling and analysis steps, and direct-reading devices.

The 24-page BS EN 482:2012 replaces the previous (now obsolete) 2006 Edition.  It is the official English language edition of EN 482:2012.  Since the EN standards are not available as stand-alone publications, but only as re-publications as adopted by each country in the European Union, this is normally how we sell the standard at Document Center Inc.

All current and many obsolete editions of BS standards are available from Document Center Inc. at our website, www.document-center.com.  As an authorized dealer of BSI standards, we offer not only the sale of the documents but also monitoring and auditing services for standards users.  Contact us by phone (650-591-7600), fax (650-591-7617) or email (info@document-center.com) to learn more.

New ASTM E691 2011 Edition, Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

ASTM E691-11, “Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method,” has just been released.  This practice describes the techniques for planning, conducting, analyzing, and treating the results of an interlaboratory study (ILS) of a test method. The statistical techniques described in this practice provide adequate information for formulating the precision statement of a test method.

ASTM E691 does not concern itself with the development of test methods but rather with gathering the information needed for a test method precision statement after the development stage has been successfully completed. The data obtained in the interlaboratory study may indicate, however, that further effort is needed to improve the test method.

Since the primary purpose of this practice is the development of the information needed for a precision statement, the experimental design in this practice may not be optimum for evaluating materials, apparatus, or individual laboratories.

This practice is concerned exclusively with test methods which yield a single numerical figure as the test result, although the single figure may be the outcome of a calculation from a set of measurements.

ASTM regulations require precision statements in all test methods in terms of repeatability and reproducibility. This practice may be used in obtaining the needed information as simply as possible. This information may then be used to prepare a precision statement in accordance with ASTM E177, “Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods.”

All current ASTM standards, and many obsolete ones, are available from Document Center Inc. at our website, www.document-center.com.  Or consider contacting us by phone (650-591-7600), fax (650-591-7617) or email (info@document-center.com).  Our staff is available from 6 am to 5 pm Monday through Friday California time.