WPC 'p3"H$l݉[֒CJ [L@uݩ%6Uq4Ts[>FY\j`USBGD"s~l]^~z4_H!\v4/`K'Rǧ 7/]O[eӳ/ yre7o]ɼ T#զ@)O 5qs0|FaIs*#vLrytThby%.SBst=o 1O3i(jK(uog|J$!AM=gco_Mb\O0tԨ '7^ٷKJ&-]1bRr~+vGdbƴA 8T9jQ7FiLQV HCdztv|#L)UE9 iFx3CQsHw81Z;0UP %LR 0C E[ U:]  nX B  0( D UP U:pw4=> y`$8Lucida Sans TypewriterTT'  4   0 .  d______________________________________________________________________________; EMISSION MEASUREMENT TECHNICAL INFORMATION CENTER ; GUIDELINE DOCUMENT ; ______________________________________________________________________________; Effect of Silica Gel on C0 2 Measurement ; INTRODUCTION ; In order to protect the instrument analyzer, silica gel is often used to remove moisture from the gas stream before carbon diox  K)  X? '!dE!?XuXX/XXXuPreparedby CandaceB.Sorrell ,EMC D     EMC GD001  t EMAD,OAQPS,EPA  <      D     May2,1988 T ? ',!dE,!?(2K$  !  <6X9`("Courier NewTT#|d => y`$8Lucida Sans TypewriterTTd>@XhQ@<6X9`("Courier NewTTriterTTXXx6X@DQX@ d($  K)  X? '!dE!?XuXX/XXXuPreparedby CandaceB.Sorrell ,EMB D     EMTICGD001  t TechnicalSupportDivision,OAQPS,EPA D     May2,1988 T ? ',!dE,!?=> y`$8Lucida Sans TypewriterTT<6X9`("Courier NewTTE{$  !    , XҀ@4     XuXX/XXXuEMISSIONMEASUREMNTENTCENTEREMISSIONMEASUREMENTTECHNICALINFORMATIONCENTER t GUIDELINEDOCUMENT  T ? '$!dE$!?? ',$!dE,$!? EFFECTOFSILICAGELONC02MEASUREMENTS  8   INTRODUCTION  p  Inordertoprotecttheinstrumentanalyzer,silicagelisoftenusedtoremovemoisturefromthegasstreambeforecarbondioxide(C02)is  H  measured.ThepurposeofthisdocumentistoprovideinformationabouttheeffectofsilicagelonC02measurementsandhowtominimizeC02   measurementerrors. SUMMARY  l  SilicagelinitiallyremovesC02,butrapidlyreachessaturationas   graphicallyshowninFigure1.Atthe200ppmC02level,ittakes2  minutestoreach96percentsaturation.Atthe1.88to2.8percentC02 x level,ittakes2minutestoreachabout97percentsaturation. CONCLUSION  D IfsilicagelisusedtoremovemoisturefromasamplegasstreamforthepurposeofmeasuringC02,itisrecommendedthatC02measurementsbe | taken2minutesafterbeginningsampling. REFERENCE  H 1.  CarbonDioxideLossesinSilicaGel,EPAMemorandumfromCandaceB.    SorrelltoRogerT.Shigehara,April13,1988.o(XX/^o( -(2 Ї