1、Designation:D3195/D3195M10(Reapproved 2015)Standard Practice forRotameter Calibration1This standard is issued under the fixed designation D3195/D3195M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number
2、 in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the calibration of variable-areaflowmeters(rotameters)used to determine air sample volumesat or close to ambient conditions
3、of pressure and temperature,in the analysis of atmospheres for pollutant content.1.2 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently
4、of the other.Combining values from the two systems may result in non-conformance with the standard.1.3 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 safety and health p
5、ractices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1071 Test Methods for Volumetric Measurement of Gas-eous Fuel SamplesD1356 Terminology Relating to Sampling and Analysis ofAtmospheresD3631 Test Methods for Measuring Surface A
6、tmosphericPressureE1 Specification for ASTM Liquid-in-Glass ThermometersE337 Test Method for Measuring Humidity with a Psy-chrometer(the Measurement of Wet-and Dry-Bulb Tem-peratures)E1137/E1137M Specification for Industrial Platinum Resis-tance ThermometersE2251 Specification for Liquid-in-Glass AS
7、TM Thermom-eters with Low-Hazard Precision Liquids3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this practice,refer toTerminology D1356.3.1.2 Standard conditions are taken as 25C 77F and101.3 kPa(760 mm Hg)at existing ambient humidity.Thisconforms to most of the ASTM methods fo
8、r atmosphericsampling and analysis that involve volumetric corrections.Absolute temperature scales are to be used when substitutingvalues into the formulae used in this procedure.4.Summary of Practice4.1 Two alternative methods of performing the requiredvolume determinations for rotameter calibratio
9、n are described:4.1.1 Using the water-sealed rotating drum meter(wet testmeter).See Section 7.4.1.2 Using the volumetric gasometer(bell prover).SeeSection 8.5.Significance and Use5.1 Choice of method depends primarily on which equip-ment is available.Higher accuracy is possible with the gasom-eter.T
10、he accuracies of the methods of atmospheric analysis,forwhich the calibration procedure is intended,do not warrant thevery highest possible accuracy in flow measurement.6.Apparatus6.1 Wet Test Meter,or Volumetric Gasometer,with waterseal and equipped with a water manometer on the inlet.6.2 Counter B
11、alance Weights,for gasometer.6.3 Mercury BarometerSee Test Methods D3631.6.4 Psychrometer,(if room air is used for calibration gas).See Test Method E337.6.5 Thermometer,to measure ambient temperature.SeeSpecifications E1,E1137/E1137M,and E2251.6.6 Stopwatch.6.7 Air Supply,either a cylinder of compre
12、ssed air or adiaphragm type pump of adequate capacity and a ballastvolume or restrictor to eliminate pulsations.6.8 Needle Valve.1This practice is under the jurisdiction ofASTM Committee D22 on Air Qualityand is the direct responsibility of Subcommittee D22.01 on Quality Control.Current edition appr
13、oved April 1,2015.Published April 2015.Originallyapproved in 1973.Last previous edition approved in 2010 as D3195/D3195M 10.DOI:10.1520/D3195_D3195M-10R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStan
14、dards 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 States1 7.Procedure Using Wet Test Meter7.1 Unless it was already calibrated within the previousthree months,
15、calibrate the wet test meter by Test MethodsD1071.The method described in Section 19 is recommendedfor highest accuracy.7.2 Set up the apparatus as shown in Fig.1,makingconnections as short as possible and large enough insidediameter to avoid any appreciable pressure drops.7.3 Before and after the c
16、omplete calibration run,recordroom temperature,barometric pressure in accordance with TestMethods D3631,and relative humidity(when room air is usedfor calibrating gas)in accordance with Test Method E337.Useaverage values for subsequent calculations.7.4 Start air flowing through the rotameter and wet testmeter.Adjust the flow to the desired rate with the needle valve.Take a pair of timed readings on the wet test meter,understeady flow,for each of five or more uniformly spaced pointson the rotamet
