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About This Item
Full Description
1.1''This guide covers the application of routine calculations to estimate sample system lag time, in seconds, for gas, liquid, and mixed phase systems.
1.2''This guide considers the sources of lag time from the process sample tap, tap conditioning, sample transport, pre-analysis conditioning and analysis.
1.3''Lag times are estimated based on a prediction of flow characteristics, turbulent, non turbulent, or laminar, and the corresponding purge requirements.
1.4''Mixed phase systems prevent reliable representative sampling so system lag times should not be used to predict sample representation of a mixed phase stream.
1.5''The values stated in inch-pound units are to be regarded as standard. Other units of measurement are included in this standard and Appendix X1 examples where normally seen in industry.
1.6''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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7''This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Document History
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ASTM D7278-21
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Standard Guide for Prediction of Analyzer Sample System Lag Times- Most Recent
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ASTM D7278-16
Standard Guide for Prediction of Analyzer Sample System Lag Times- Historical Version
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ASTM D7278-11
Standard Guide for Prediction of Analyzer Sample System Lag Times- Historical Version
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ASTM D7278-06
Standard Guide for Prediction of Analyzer Sample System Lag Times- Historical Version