1、Designation:D386412Standard Guide forOn-Line Monitoring Systems for Water Analysis1This standard is issued under the fixed designation D3864;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parent
2、heses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide covers the selection,establishment,application,and validation and verification of monitoringsystems for determining water characteristics by con
3、tinualsampling,automatic analysis,and recording or otherwisesignaling of output data.The system chosen will depend on thepurpose for which it is intended:whether it is for regulatorycompliance,process monitoring,or to alert the user of adversetrends.If it is to be used for regulatory compliance,the
4、methodpublished or referenced in the regulations should be used inconjunction with this guide and other ASTM methods.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate s
5、afety and health practices and determine the applica-bility of regulatory limitations prior to use.Specific hazardstatements are given in Section 7.2.Referenced Documents2.1 ASTM Standards:2D1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD3370 Practices for Sampling Water fro
6、m Closed ConduitsD4210 Practice for Intralaboratory Quality Control Proce-dures and a Discussion on Reporting Low-Level Data(Withdrawn 2002)3D5540 Practice for Flow Control and Temperature Controlfor On-Line Water Sampling and AnalysisE178 Practice for Dealing With Outlying Observations2.2 ASTM Spec
7、ial Technical Publication:STP 442 Manual on Water43.Terminology3.1 DefinitionsFor definitions of terms used in this guiderefer to Terminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 Calibrations:3.2.1.1 laboratory calibration curve for flow-throughsystemscalibration curve calc
8、ulated from withdrawn samplesor additional standards that may be spiked or diluted andanalyzed using the appropriate laboratory analyzer.3.2.1.2 laboratory calibration curve for flow-throughsystemstype of sample used to generate a laboratory calibra-tion curve for flow-through systems.3.2.1.3 line s
9、ample calibrationcoincidental comparisonof a line sample and adjustment of a continuous analyzer to thecompared laboratory analyzer or a second continuous analyzer.3.2.1.4 multiple standard calibration where the calibra-tion curve is calculated from a series of calibration standardscovering the rang
10、e of the measurements of the sample beinganalyzed.3.2.1.5 probe calibrationwhere the probe is removedfrom the sample stream and exposed to a calibration solutionand the analyzer is adjusted to indicate the appropriate value.Alternately,two probes are exposed to the same solution andthe on-line analy
11、zer is adjusted to coincide with the pre-calibrated laboratory instrument.3.2.1.6 reference sample calibration coincidental com-parison of a reference sample and adjustment of a continuousanalyzer to the compared laboratory analyzer results.3.2.2 cycle timethe interval between repetitive sampleintro
12、ductions in a monitoring system with discrete sampling.3.2.3 driftthe change in system output,with constant inputover a stated time period of unadjusted,continuous operation;usually expressed as percentage of full scale over a 24-hperiod.3.2.3.1 span driftdrift when the input is at a constant,stated
13、 upscale value.3.2.3.2 zero driftdrift when the input is at zero.1This guide is under the jurisdiction of ASTM Committee D19 on Water and isthe direct responsibility of Subcommittee D19.03 on Sampling Water and Water-Formed Deposits,Analysis of Water for Power Generation and Process Use,On-Line Wate
14、r Analysis,and Surveillance of Water.Current edition approved June 1,2012.Published October 2012.Originallyapproved in 1979.Last previous edition approved in 2006 as D3864 06.DOI:10.1520/D3864-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at se
15、rviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from ASTM Headquarters.Contact Customer Service,100 BarrHarbor Drive,West C
16、onshohocken,PA 19428-2959.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.4 full scalethe maximum measuring limit of the sys-tem for a given range.3.2.5 inputthe value of the parameter being measured atthe inlet to the analyzer.3.2.6 interferencean undesired output caused by a sub-stance or substances other than the one being measured.3.2.6.1 DiscussionThe effect of interfering substance(s)on the measured parameter of interest sho
