ÿWPCX àQ˜%£nUê ­Pv~r)âØµ—2ÓÁÒ±/À±iln…h Ïlžk™çb=ðÅþç®$à•É=µïª(Ê™'¹MX<]p£”ÿ!¾árMedÜÔ¾OϹk™ÚÒ/¯àøÕxÄŒº¬”[Ü+ý–@Üó¾ltU%x—앲ВSÀÖý§ ÃÍFV£™–eQ§´N‡[›µÓ¡S @ƒpŒ œL8Ï]ºulã½”ƒmݺ$&<ÉÂ݃訲P.ÿpK¹î_´ûÈÚa.`õµ„ <VK ׄ\©`šãz©kãŠDO­Sx›IT‚1Þ>>Åv#mãµ…¸ãÜ¢LjÅ‘ôŠOù_ÃÐN˜êlÃKß¶òDÌ]©PÒEE„y²qàg? KH›BæVs{Añ°Ãêy#é³;vz>›Iç¤û J%›í.¡€l“Ü{E’& ?€òjuyô®S2bf{ù=êK¿.ùº3{uY(&­liìð†ŒC™:w¯X_G}´\Kù”¤HD@éѳJªôs…áQ‘Ûm 0§–€/ï™c`?æS`Š<ˆÒz7<]%î$v\ó0ÍõÍgƒ[ðN½ºˆ„sÁ.U2„ %¶ë¼ 0O§U:öE 0 2 0O> UH UHÕ D+ ÆH 0O 0E] AY¢ dùû <ô dù0 5)d¬^, dÉ6=ÿdÉ<;d.@VndìÄF° Cöfa B&CnXS 04«ßíßU:ÌšU: UHÚ h"w(4D2xÐðA`UniversWNX áÝ ƒÑ)ÝÓ  ÓÝ  ÝÒ„°ÒÒX°ÒÔ€X-¼XXXÔß?€!' °°xdE„¯ü!?ßÐ ° ÐPrepared€by€ò òPeter€R.€Westlinó ó,€EMCà ì àà D àà œ àò òEMC€GD„031ó óÐ ¿ ÐEmission€Measurement€Center,€OAQPSà ì àà D àà œ àMarch€14,€1995à€€%€%B€%àˆÐ Ÿï Ðß?€!' °°xdE„rü!?ß('2Ñ$©©Ý ƒ$¤T!ÝÓ  ÓÝ  Ý<þ6X9`("Courier NewTT Ý ƒÑ'ÝÓ  ÓÝ  ÝÔ€X-¼XXXÔÒ„°ÒÒX°ÒÓo[°X°` ¸ hÀpÈ xÐ (#€%Ø'0*ˆ,à.813è5@8˜:ð<H? A°œXoÓß?€!' °°xdE„¯ü!?ßÐ ° Ðò òÔ€ X-¼XXX-¼ÔEMC€GD„031€à@ZZZ‚àEMC€GUIDELINE€DOCUMENTˆà€°"°"°"€%àPAGE€Ú  Ú1Ú  ڈР¿ Ðß?€!' °°xdE„žü!?ßó ó('2Ñ$§§Ý ƒ$¤T!ÝÓ  ÓÝ  Ý<à09Z 0Courier (W1) Regular<àŠ 09Z 0Courier (W1) Regular'ÈÈÈÈdxd… Level 1 Level 2 Level 3 Level 4 Level 5('2Ñ$££Ý ƒ$¤T!ÝÓ  ÓÝ  Ý(ÿÿ$––ò ò(Ú  ÚÚ  Ú)ó ó  Müÿ << deUUXXQ¹ÜiXXäXX©17XX‰.XXÁ65XXùV‚ÜiXXJXXÁ¶PJxbXXorTð4mXX\rÌ4i 2Q_iÌ~~=~~17.65~V_i~~{{P_b}€€over€€{T_m€theta_i}}€€XXq‰ÜiXXùäXXÉ17XX©.XXá65XXv‚Üi¦ XXJXXÛ¶PdxbXXorTð4aXXr4i +q_i~=~17.65~v_i~~{{P_b}€over€{T_a~theta_i}}ÔX-XX^Z528XX®Z$XXZRXXDD29XX$D.XX\D92XX”DinXX,D.XX¼DHg "{528€DEG€R}€over€{29.92~€\in.~€Hg}KX XXìQXXìäc XñXXÎIRænJi6Jä”J1XX Q¼ÌiXX¶Dn 3€OVERLINE€Q€~€=~€{sum€from€{i`=`1}€to€n€Q_i}€over€nGX XXìqXXãìä` XÁXXØÎI"ænàJiJädJ1XXë q\ÌiXXnDn 1OVERLINE€q~€=~€{sum€from€{i`=`1}€to€n€q_i}€over€nXXXX§QXX›äëXy@KXâXX.QXX„.ãXXTòIž n\ni‚näàn1XXg.qØðiKXòøXXòDQXX_xXX100 LDELTA€Q~=~{OVERLINE€Q~€„~€sum€from€{i`=`1}€to€n€q_i}€overÏOVERLINE€Q~€x~€100XXXX§qÒ1XX³ä X‘@XX¨¬qn1XX´¬ãGX„`XX„¬qGX–øXX–DqXX_xXX100 <DELTA€q_1~€=~€{q_1~€„~€overline€q}€over€{overline€q}~€x~€100 ÿÿÿdTable_A d3|«2xÐðA`UniversWNXXxÐðPQXP<þ6X9`("Courier NewTTXXxþ6X@ÉQX@( ¤T$¡¡Ó  Ó ãÝ ƒÑ)ÝÓ  ÓÝ  ÝÒ„°ÒÒX°ÒÔ€'X-¼XXXÔß?€!' °°xdE„¯ü!?ßÐ ° ÐPrepared€by€ò òPeter€R.€Westlinó ó,€EMCà ì àà D àà œ àò òEMTIC€GD„031ó óÐ ¿ ÐEmission€Measurement€Center,€OAQPSà ì àà D àà œ àMarch€14,€1995à€€%€%B€%àˆÐ Ÿï Ðß?€!' °°xdE„rü!?ß<þ6X9`("Courier NewTT Ý ƒÑ'ÝÓ  ÓÝ  ÝÔ€)X-¼XXXÔÒ„°ÒÒX°ÒÓE1ÿÿX°` ¸ hÀpÈ xÐ (#°œXEÓÓE1ÿÿX°` ¸ hÀpÈ xÐ (#ÿÿXŽXEÓÓo[°X°` ¸ hÀpÈ xÐ (#€%Ø'0*ˆ,à.813è5@8˜:ð<H? AÿÿXŽXoÓß?€!' °°xdE„¯ü!?ßÐ ° Ðò òÔ€*X-¼XXX-¼ÔEMTIC€GD„031€à@âââ‚àEMTIC€GUIDELINE€DOCUMENTˆà€°"°"°"€%àPAGE€Ú  Ú1Ú  ڈР¿ Ðß?€!' °°xdE„žü!?ßó ó<þ6X9`("Courier NewTT<à09Z 0Courier (W1) Regularô{‡$7d„Ý ƒ$¤T!ÝÓ  ÓÝ  ÝÑ,°ÑÒ„°ÒÒX°ÒññÖ€ÿÿÖññññÖ€&ÿÿÖññÓE1ÿÿX°` ¸ hÀpÈ xÐ (#°œXEÓÔ€X-¼XXXÔññÖ€ÿÿÖññññÖ€(ÿÿÖññò òÑ  Ñß?€!' °°$xdE„¯$ü!?ßÐ ° Ðà@..‚àEMISSION€MEASUREMENTññ€TECHNICAL€INFORMATIONññ€CENTERˆÌà@JJ‚àGUIDELINE€DOCUMENTˆÌó óß?€!' °°$xdE„’$ü!?ßà@‚‚$‚àò òˆÐ “ã Ðó óÌò òÔ€ X-¼XXX-¼Ôà@z z ‚àTECHNICAL€ASSISTANCE€MONOGRAPHó óˆÐ ŠÚ Ðà0 ° àà@  ‚°€%°€%àÔ€X-¼XX X-¼Ôò òEVALUATION€PROCEDURE€FOR€MULTI„HOLE€SAMPLE€PROBESˆÐ jº ÐÓ  Óó óBy€King€K.€Yu€and€Peter€R.€WestlinÐ J š ÐÓ  ÓÌò òINTRODUCTIONó óÐ ò B  ÐÌÓ  ÓThe€installation€requirements€of€the€revised€Continuous€MonitoringÏPerfomance€Specification€2òò1óó€allow€the€use€of€a€multi„hole€stack€gasÐ z Ê  Ðsampling€probe.€€The€provisions€for€this€probe€include€that€the€sample€flowÏrate€through€each€hole€is€within€òò+óó€10€percent€of€the€average€through€allÐ "r  Ðthe€holes€at€the€design€flow€rate€for€the€probe.€€This€paper€describes€aÏmethod€for€determining€whether€this€provision€is€met.ÌÌò òTEST€METHODó óÐ r  ÐÌ1.à0  àApparatusÐ&v€%€% Ðà0 ° à1.1à0°€%°€%àSample€Probe.€€Probe€with€sample€holes€located€according€to€theÐ úJ Ðcriteria€in€revised€Performance€Specification€2.Ð €%€% ÐÌà0 ° à1.2à0°€%°€%àReference€Method€5€Meter€Box.€€Meter€box€equipped€with€properlyÐ vÆ Ðsized€pump,€calibratedòò2óó€dry„gas€meter,€water€manometer,€and€meterÐ Jš Ðtemperature€gauges.Ð €%€% ÐÌà0 ° à1.3à0°€%°€%àPartial„flow€Dry„Gas€Meter.€€Dry„gas€meter€calibratedòò2óó€in€the€rangeÐ Æ Ðof€flowrates€through€a€single€hole€of€the€multi‚hole€probe.€€ThisÏdry„gas€meter€should€have€a€back€pressure€of€less€than€0.2€in€Hòò2óóOÐ n¾ Ðat€these€flowrates.Ð €%€% ÐÌà0 ° à1.4à0°€%°€%àTubings€and€Connectors.€€Diameters€of€all€tubings€and€connectorsÐ ê:! Ðbetween€the€sample€probe€and€the€total€flow€dry„gas€meter€must€beÏlarger€than€the€inside€diameter€of€the€probe,€and€all€tubings€andÏfittings€between€the€partial€flow€dry„gas€meter€and€sample€holesÏmust€have€diameters€larger€than€that€of€the€holes.€€All€tubingsÏshould€be€as€short€as€practical.Ð €%€% ÐÌà0 ° à1.5à0°€%°€%àStopwatch.ж$ (€%€% ÐÌ2.à0  àProcedure.€€This€procedure€should€be€completed€under€laboratoryÐ ^&®!* Ðconditions€where€ambient€temperatures€and€moisture€conditions€areÏwell€controlled.Ð €%€% ÐÌà0 ° à2.1à0°€%°€%àConnect€the€probe€and€the€measurement€equipment€as€shown€in€FigureÐ ®)þ$. Ð1.€Connect€the€partial€flow€dry„gas€meter€to€any€hole€of€the€probeÏmaking€certain€that€the€connection€is€leak„tight€and€does€not€blockÏany€part€of€the€sample€hole.€€Leave€the€other€sample€holes€open€andÏclear.Ð €%€% ÐÌà0 ° à2.2à0°€%°€%àRecord€the€initial€volume€readings€on€both€dry„gas€meters,€theÐ ¦.ö)4  Ðambient€temperature,€barometric€pressure,€and€the€total€flow€dry„¼gas€meter€temperature.Ð €%€% ÐÌà0 ° à2.3à0°€%°€%àStart€the€pump€and€the€stopwatch€simultaneously€and€set€the€totalÐ ò| Ðprobe€flow€rate€to€equal€the€design€flow€rate€of€the€sample€probe.€Ï(A€trial€run€before€the€test€is€helpful€in€setting€this€rate).Ð €%€% ÐÌà0 ° à2.4à0°€%°€%àRecord€the€manometer€reading€and€continue€sampling€at€a€constantÐ B Ì Ðflow€rate€until€a€sample€volume€equivalent€to€approximately€1.0€ftòò3óóÐ    Ðx€number€of€sample€holes€is€measured€by€the€total€flow€dry„gasÏmeter.€€At€the€end€of€the€run,€stop€the€pump€and€the€stopwatch;Ïrecord€the€final€volume€readings€of€both€dry„gas€meters€and€theÏfinal€temperature(s)€of€the€total€flow€dry„gas€meter.Ð €%€% ÐÌà0 ° à2.5à0°€%°€%àRepeat€steps€2.1€through€2.4€for€the€other€sample€holes€maintainingÐ ˜  Ðthe€same€manometer€pressure€as€for€the€first€run.Ð €%€% ÐÌ3.à0  àCalculationsЊ€%€% ÐÌà0 ° à3.1à0°€%°€%àDetermine€the€total€flow€rate,€Qòòióó,€and€each€partial€flow€rate,€qòòióó,Ð 2¼ Ðfrom€the€test€data€for€each€hole,€as€follows:Ð €%€% Ð߉€QA=zð 0  €@Xdddddddd@E„Úü!>ô dv ÚÄ"¢‰ßâ „…„…„€%„€%â°â „…„…„…„…â°â „…„…„…„…â°â „…„…„…„…â°â „…„…„…„…â°â „€%„€%„…„…â߉€QA=zð 0  €@Xdddddddd@E„þü!>Z dGv þÄ"¢‰ßâ „…„…„€%„€%â°â „…„…„…„…â°â „…„…„…„…â°â „…„…„…„…â°â „…„…„…„…â°â „€%„€%„…„…âÌà ° àWhere:Ìà ° àvà0  à=à0` €%€%àVolume€recorded€on€the€total€flow€gas€meter,€corrected€by€theÐ Ê!T! Ðmeter€calibration€factor,€scf.Ð ` €%` €% Ðà ° àPòòbóóà  à=à0 ` àBarometric€pressure,€in.€Hg.Ðr#ü#` €%` €% Ðà ° àTòòmóóà  à=à0 ` àTemperature€of€the€total€flow„gas€meter,€òòððóóR.ÐF$Ð$` €%` €% Ðà ° àððòòióóà  à=à0 ` àElapsed€sampling€time,€min.Ð%¤%` €%` €% Ðà ° àvòòióóà  à=à0 ` àVolume€recorded€on€partial€flow„gas€meter,€corrected€by€theÐ î%x& Ðmeter€calibration€factor,€scf.Ð ` €%` €% Ðà ° àTòòaóóà  à=à0 ` àRoom€temperature,€òòððóóR.Ж' !(` €%` €% Ðà ° à17.65=à0 ` àStandard€temperature€and€pressure€correction€factor,€viz.€Ð j(ô!) Ðߎ€VFBz X@ 0  €@Xdddddddd@E` >)@â® däüÚ(ªŽßÐ>)È"*` €%` €% Ðà ° àCalculate€the€mean€total€flow€rate,€Ô)Qxxœ8Ô,€and€the€mean€of€theÐ  ,ª%+ Ðà ° àpartial€flow€rate,€Ô)qxxœ8Ô:Ð ô,~&, ÐÐ È-R'- Ð߉€QA=zð 0  €@Xdddddddd@E„vü!>düv vÄ"¢‰ßâ „…„…„€%„€%â³â „…„…„…„…â³â „…„…„…„…â³â „…„…„…„…â³â „…„…„…„…â³â „…„…„…„…â³â „€%„€%„…„…â߉€QA=zð 0  €@Xdddddddd@E„n ü!>0dœv n Ä"¢‰ßâ „…„…„€%„€%â³â „…„…„…„…â³â „…„…„…„…â³â „…„…„…„…â³â „…„…„…„…â³â „…„…„…„…âÌâ „€%„€%„…„…âà ° àWhere:Ìà0 ° ànà  à=à0` °€%°€%àNumber€of€sampling€holes.Ð:Ä ` €%` €% ÐÌà0 ° à3.2à0°€%°€%àDetermine€the€percent€deviation,€ððQ,€from€the€mean€total€flow€rate:Ðâl €%€% Ð߉€QA=zð 0  €@Xdddddddd@E„¶ü!b dxš ¶Ä"Ɖßâ „…„…„€%„€%â°â „…„…„…„…â°â „…„…„…„…â°â „…„…„…„…â°â „…„…„…„…â°â „…„…„…„…â°â „€%„€%„…„…âÌà0 ° àà0°€%°€%àIf€a€ððQ€greater€than€10€percent€is€found,€indicating€the€total€flowÐ ‚  Ðrate€is€too€low€for€the€probe€design€or€the€sample€holes€are€tooÏlarge,€repeat€the€test€with€a€redesigned€probe€or€a€revised€flowÏrate.Ð €%€% ÐÌà ° à3.3à0  àDetermine€the€percent€deviation,€ððqòòióó,€from€the€mean€partial€flowÐ ¦0 Ðrate€for€each€hole:€Ð €%€% Ðߌ€TD@zšð 0  €@Xdddddddd@E„è!ü!XB dx „!Ä" ŒßÌà0 ° àà0°€%°€%àAll€ððqòòióó€must€be€within€òò+óó€10€percent€for€an€acceptable€probe€à @ø" àdesignÐ " ¬ Ðâ „……„€%€%â³â „……„……â³â „……„……â³â „……„……â³â „……„……â³â „……„……â³â „€%€%„……âat€the€design€flow€rate.Ð €%€% ÐÌò òSUMMARY€AND€DISCUSSION€OF€TEST€RESULTSó óÐ –' !( ÐÌMethod€validation€tests€were€performed€in€the€laboratory€using€threeÏdifferent€multi„hole€probes.€€All€three€probes€had€similar€internalÏdiameters€of€0.375€inches€and€each€had€three€sample€equal„sized€sampleÏholes:€0.078€in.€for€probe€1,€0.125€in.€for€probe€2,€and€0.203€in.€forÏprobe€3.€The€results€of€the€test€are€summarized€in€Table€1.ÌÌThese€test€results€demonstrate€the€importance€of€properly€setting€the€totalÐ B.Ì'0 Ðflow€rate€for€the€probe.€€For€example,€at€similar€flow€rates€of€about€48Ïscfh,€probe€1€(I.D.€=€0.078€in.)€showed€that€the€sum€of€partial€flow€ratesÏtotaled€within€10€percent€of€the€measured€total€flow€rate€while€probe€2Ï(I.D.€=€€0.125€in.)€showed€almost€25€percent€difference€between€these€twoÏfigures.€€This€indicates€that€the€slight€pressure€drop€associated€with€theÏpartial€flow€dry„gas€meter€greatly€affected€the€partial€flow€rates€of€probeÏ2,€because€of€the€larger€sample€holes,€and€was€a€limiting€factor€in€theÏpartial€flow€measurements.€€The€result€is€a€false€indication€of€theÏoperation€of€the€probe.ÌÌThe€second€criterion€set€by€the€method€is€that€the€partial€flow€rates€allÏbe€within€10€percent€of€the€average€partial€flow€rate.€€These€resultsÏindicate€that€this€criterion€can€be€met€if€the€total€flow€rate€isÏsufficient€to€cause€a€probe€pressure€of€about€„10€in.€water.€€Of€course,Ïthe€pressure€drop€at€each€sam‚ple€hole€includes€the€pressure€drop€associatedÏwith€the€dry„gas€meter€and€the€tubing€connectors€during€the€measurements.€ÏThis€makes€it€of€prime€importance€that€the€dry„gas€meter€be€of€high€qualityÏ(i.e.,€low€pressure€drop),€and€the€tubing€and€connectors€be€of€laraeÏdiameter€and€as€short€as€practical.ÌÌOne€limitation€in€the€use€of€multi„hole€probes€brought€out€by€these€resultsÏand€by€the€work€of€othersòò3óó€is€that€very€small€sample€holes€are€required€toÏmaintain€adequate€pressure€drop€to€assure€approximately€equal€flow.€€TheÏresults€of€this€study€in‚dicate€a€hole€diameter€of€0.125€in.€is€about€theÏupper€limit€for€a€1.0€cfm€probe.€€This€restriction€limits€the€applicabilityÏof€multi‚hole€probes€to€stack€gases€with€low€particulate€concentrations€toÏavoid€probe€plugging€problems.ÌÌÌÒ , ÒÒ Ð Òà@..àò òˆÌÌÓ  ÓTABLE€1,€€SUMMARY€OF€RESULTS€OF€THE€FLOW„RATE€EVALUATIONSÌà@.. àOF€MULTI„POINT€SAMPLING€PROBESÌó óÌÔ*ƒ dÔÔ,Udd"ÔÔ,(dd ÔÔ,(dd ÔÔ,(dd ÔÔ,(dd ÔÔ,…dd ÔÔ,…dd ÔÔ,…dd ÔÔ+  ÔÐ )€!€p€‚x‚ƒƒ„„)ÐHoleÏDiameterÏ(in.)Ð €! „„ÐProbeÏPressureÏ(in.€Hòò2óóO)Ð €! „„ÐAverageÏTotalÏFlow„rateÏ(SCFH)Ð €! „„ÐAverageÏPartialÏFlow„rateÏ(SCFH)Ð €! „„ÐPercentÏDeviationÏFromÏTotalÏ(ððQ,€%)Ð €!„„…… ÐPercent€DeviationÏPer€HoleÌ€€ððqòòaóó€€€€€ððqòòbóó€€€€€ððqòòcóóÌ€€(%)€€€€(%)€€€€€(%)Ð "€(€‚x‚ƒƒ„„"Ð0.078Ð  „„Є1ˆ.2Ì„3ˆ.1Ì„6ˆ.4Ì„10ˆ.1Ì„16ˆ.4Ì„35ˆ.3Ð  „„Ð19ˆ.4Ì31ˆ.8Ì47ˆ.4Ì60ˆ.1Ì74ˆ.6Ì108ˆ.8Ð  „„Ð5ˆ.7Ì9ˆ.5Ì14ˆ.3Ì18ˆ.2Ì23ˆ.5Ì33ˆ.3Ð  „„Ð11ˆ.7Ì10ˆ.7Ì9ˆ.1Ì9ˆ.2Ì5ˆ.3Ì8ˆ.2Ð  „„Ð0ˆ.9Ì7ˆ.1Ì5ˆ.2Ì6ˆ.9Ì4ˆ.3Ì3ˆ.4Ð  „„Є1ˆ.2Ì„6ˆ.2Ì„2ˆ.6Ì„6ˆ.5Ì„0ˆ.4Ì„3ˆ.3Ð  „„Ð0ˆ.4Ì„0ˆ.8Ì„2ˆ.6Ì„0ˆ.3Ì„3ˆ.9Ì„0ˆ.1Ð "€`€‚x‚ƒƒ„„"Ð0.125Ð  „„Є1ˆ.1Ì„3ˆ.4Ì„7ˆ.0Ì„10ˆ.9Ì„14ˆ.5Ð  „„Ð47ˆ.9Ì83ˆ.7Ì124ˆ.7Ì148ˆ.3Ì170ˆ.0Ð  „„Ð12ˆ.3Ì25ˆ.6Ì36ˆ.9Ì46ˆ.7Ì51ˆ.3Ð  „„Ð23ˆ.0Ì8ˆ.3Ì11ˆ.3Ì5ˆ.6Ì9ˆ.4Ð  „„Ð6ˆ.5Ì10ˆ.8Ì10ˆ.8Ì5ˆ.5Ì11ˆ.2Ð  „„Є5ˆ.8Ì0ˆ.7Ì„8ˆ.7Ì„0ˆ.8Ì„3ˆ.9Ð  „„Є0ˆ.9Ì„10ˆ.1Ì„2ˆ.0Ì„4ˆ.8Ì„7ˆ.4Ð "€Ð€‚x‚ƒƒ„„"Ð0.203Ð  „„Є1ˆ.1Ì„3ˆ.2Ì„5ˆ.4Ð  „„Ð75ˆ.5Ì131ˆ.9Ì173ˆ.7Ð  „„Ð14ˆ.8Ì34ˆ.5Ì46ˆ.3Ð  „„Ð41ˆ.3Ì21ˆ.5Ì20ˆ.0Ð  „„Ð42ˆ.2Ì23ˆ.3Ì23ˆ.3Ð  „„Є2ˆ.4Ì2ˆ.1Ì„1ˆ.4Ð  „„Є39ˆ.9Ì„25ˆ.3Ì„21ˆ.9¿Ìò òÌÒ „ ÒÒ X ÒÓ  ÓREFERENCESó óÌÌ1.à0..àPerformance€Specification€2€„€Specifications€and€Test€ProceduresÏfor€SOòò2óó€and€NOòòxóó€Continuous€Monitoring€Systems€in€Stationary€Sources,ÏEnvironmental€Protection€Agency,€Emission€Measurement€BranchÏrevision,€May€1979.ÌÌ2.à0..àWestlin,€P.€R.€and€R.€T.€Shigehara,€Procedure€for€Calibrating€andÏUsing€Dry€Gas€Volume€Meters€as€Calibration€Standards,€SourceÏEvaluation€Society€Newsletter,€Vol.€3,€No.€1,€February€1978.ÌÌ3.à0..àTechnical€Manual€for€Process€Stream€Volumetric€Flow€Measurement€andÏGas€Sample€Extraction€Methodology,€prepared€for€EPA,€IERL,€PMB,€byÏTRW€Systems€Group,€Contract€No.€68„02„1412,€November€1975.Ì