1、Designation:D676402(Reapproved 2019)Standard Guide forCollection of Water Temperature,Dissolved-OxygenConcentrations,Specific Electrical Conductance,and pHData from Open Channels1This standard is issued under the fixed designation D6764;the number immediately following the designation indicates the
2、year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide describes procedures to collect cross-sectional
3、means of temperature,dissolved oxygen(DO),spe-cific electrical conductance(SC),and pH of water flowing inopen channels.1.2 This guide provides guidelines for preparation andcalibration of the equipment to collect cross-sectional means oftemperature,DO,SC,and pH of water flowing in openchannels.1.3 T
4、his guide describes what equipment should be used tocollect cross-sectional means of temperature,DO,SC,and pHof water flowing in open channels.1.4 This guide covers the cross-sectional means oftemperature,DO,SC,and pH of fresh water flowing in openchannels.1.5 This standard does not purport to addre
5、ss all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed i
6、n accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 A
7、STM Standards:2D888 Test Methods for Dissolved Oxygen in WaterD1125 Test Methods for Electrical Conductivity and Resis-tivity of WaterD1129 Terminology Relating to WaterD1293 Test Methods for pH of WaterD4410 Terminology for Fluvial SedimentD4411 Guide for Sampling Fluvial Sediment in MotionD5464 Te
8、st Method for pH Measurement of Water of LowConductivity3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminologies D1129 and D4410.3.2 Definitions of Terms Specific to This Standard:3.2.1 electronic temperature sensor,nan electrical devicethat converts ch
9、anges in resistance to a readout calibrated intemperature units.Thermistors and resistance temperaturedetectors are examples of electronic temperature sensors.3.2.2 thermometer,nanydeviceusedtomeasuretemperature,consisting of a temperature sensor and some typeof calibrated scale or readout device.4.
10、Summary of Guide4.1 This guide establishes criteria and describes proceduresfor the collection of cross-sectional means of temperature,DO,SC,and pH of water flowing in open channels.4.2 This guide provides only generic guidelines for equip-ment use and maintenance.Field personnel must be familiarwit
11、h the instructions provided by equipment manufacturers.There are a large variety of available field instruments and fieldinstruments are being continuously updated or replaced usingnewer technology.Field personnel are encouraged to contactequipment manufacturers for answers to technical questions.5.
12、Significance and Use5.1 This guide describes stabilization criteria for recordingfield measurements of temperature,DO,SC,and pH.5.2 This guide describes the procedures used to calibrateand check meters to be used in the field to records thesemeasurements and the procedures to be use in the field too
13、btain these data.1This guide is under the jurisdiction of ASTM Committee D19 on Water and isthe direct responsibility of Subcommittee D19.07 on Sediments,Geomorphology,and Open-Channel Flow.Current edition approved Nov.1,2019.Published December 2019.Originallyapproved in 2002.Last previous edition a
14、pproved in 2013 as D6764 02(2013).DOI:10.1520/D6764-02R19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyrigh
15、t ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Stan
16、dards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 5.3 This guide describes quality assurance procedures to befollowed when obtaining cross-sectional means of temperature,DO,SC,and pH of water flowing in open channels.5.4 Field measurement must accurately represent the waterflowing in the open channel being measured.Methods need tobe used that will result in an accurate representation of themean of the parameter of interest.Procedu
