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ASTM D5540 2013 Edition, July 15, 2013
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Standard Practice for Flow Control and Temperature Control for On-Line Water Sampling and Analysis
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This practice covers the conditioning of a flowing water sample for the precise measurement of various chemical and physical parameters of the water, whether continuous or grab. This practice addresses the conditioning of both high- and low-temperature and pressure sample streams, whether from steam or water.

This practice provides procedures for the precise control of sample flow rate to minimize changes of the measured variable(s) due to flow changes.

This practice provides procedures for the precise control of sample temperature to minimize changes of the measured variable(s) due to temperature changes.

The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.

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.