ASTM D7278 - 16 - Standard Guide for Prediction of Analyzer Sample System Lag Times

ASTM D7278 - 16

Standard Guide for Prediction of Analyzer Sample System Lag Times

Status : Current   Published : April 2016



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 the stream.

1.5 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

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 and health practices and determine the applicability of regulatory limitations prior to use.

Standard NumberASTM D7278 - 16
TitleStandard Guide for Prediction of Analyzer Sample System Lag Times
Publication Date01 April 2016
Normative References(Required to achieve compliance to this standard)No other standards are normatively referenced
Informative References(Provided for Information)No other standards are informatively referenced
Descriptors Analyzer, Lag time, On-line, Sample systems, Sampling, Response
File Size222 KB

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