1、Designation:D617697(Reapproved 2022)Standard Practice forMeasuring Surface Atmospheric Temperature with ElectricalResistance Temperature Sensors1This standard is issued under the fixed designation D6176;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、 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 practice provides procedures to measure represen-tative near-surface atmospheric(outdoor
3、 air)temperature formeteorological purposes using commonly available electricalthermometers housed in radiation shields mounted on station-ary or portable masts or towers.1.2 This practice is applicable for measurements over thetemperature range normally encountered in the ambientatmosphere,50 to+50
4、 C.1.3 Air temperature measurement systems include a radia-tion shield,resistance thermometer,signal cables,and associ-ated electronics.1.4 Measurements can be made at a single level for variousmeteorological purposes,at two or more levels for verticaltemperature differences,and using special equipm
5、ent(at one ormore levels)for fluctuations of temperature with time appliedto flux or variance measurements.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all of thesafety concern
6、s,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.1.7 This international standard was developed in accor-dance with internat
7、ionally 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 ASTM Standards:2D1356 Termin
8、ology Relating to Sampling and Analysis ofAtmospheresE344 Terminology Relating to Thermometry and Hydrom-etryE644 Test Methods for Testing Industrial Resistance Ther-mometersE1137/E1137M Specification for Industrial Platinum Resis-tance Thermometers3.Terminology3.1 Definitions:3.1.1 For definitions
9、of terms used in this practice,refer toTerminology D1356 and E344.Some definitions are repeatedin this section for the readers convenience.3.1.2 connecting wiresthe wires which run from the ele-ment through the cable end closure and external to the sheath.3.1.3 interchangeabilitythe extent to which
10、the thermom-eter matches a resistance-temperature relationship.3.1.4 inversionthe increase in potential temperature withan increase in height(see 3.1.5 and 3.2.7).3.1.5 lapse ratethe change in temperature with an in-crease in height(see 3.1.4 and 3.2.7).3.1.6 resistance thermometera temperature-meas
11、uring de-vice comprised of a resistance thermometer element,internalconnecting wires,a protective shell with or without means formounting,a connection head or connecting wire with otherfittings,or both(see also 3.2.3).3.1.7 resistance thermometer elementthe temperature-sensitive portion of the therm
12、ometer composed of resistancewire,film or semiconductor material,its supporting structure,and the means for attaching connecting wires.1This practice is under the jurisdiction ofASTM Committee D22 on Air Qualityand is the direct responsibility of Subcommittee D22.11 on Meteorology.Current edition ap
13、proved March 1,2022.Published April 2022.Originallyapproved in 1997.Last previous edition approved in 2015 as D6176 97(2015).DOI:10.1520/D6176-97R22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards
14、volume information,refer to the standards Document Summary page onthe ASTM website.Copyright 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 standar
15、dization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.13.1.8 thermistora semiconductor whose primary functionis to exhibit a monotonic change(general
16、ly a decrease)inelectrical resistance with an increase in sensor temperature.3.2 Definitions of Terms Specific to This Standard:3.2.1 ambientthe portion of the atmosphere where the airtemperature is unaffected by local structural,terrain,or heatsource or sink influences.3.2.2 sensorused interchangeably with resistance ther-mometer(see 3.1.6)in this practice.3.2.3 shielda ventilated housing designed to minimize theeffects of solar and terrestrial radiation on a temperature sensorwhile maximizing
