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The appendix describes a specific mechanical mast configuration employing 4 inch diameter sampling probes and includes representative examples of deployed mast and control systems. It emphasizes that engineering and equipment descriptions are informational only and do not constitute OTM 33A method requirements, with safe deployment, performance, and any adoption or modification solely the user’s responsibility.",{"@graph":69,"@context":121},[70,84,104],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/gmap-req-da-mast-system-mechanical-drawings-otm-33a-appendix-b-wiring-schematics/674865/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":98,"encodingFormat":97,"isAccessibleForFree":99,"interactionStatistic":100},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/gmap-req-da-mast-system-mechanical-drawings-otm-33a-appendix-b-wiring-schematics/674865.png","ImageObject",300,407,{"name":92,"@type":93},"Rainbow Cat","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-04",true,{"@type":101,"interactionType":102,"userInteractionCount":4},"InteractionCounter",{"@type":103},"ViewAction",{"@type":105,"mainEntity":106},"FAQPage",[107,113,117],{"name":108,"@type":109,"acceptedAnswer":110},"What does GMAP-REQ-DA OTM 33A Appendix B include?","Question",{"text":111,"@type":112},"It contains illustrative mechanical drawings for a vehicle-mounted mast system and basic wiring control schematics for a GMAP system.","Answer",{"name":114,"@type":109,"acceptedAnswer":115},"Does the appendix define engineering requirements for OTM 33A?",{"text":116,"@type":112},"No. The document states the engineering and equipment descriptions are illustrative and do not constitute OTM 33A method requirements.",{"name":118,"@type":109,"acceptedAnswer":119},"What mast configuration is shown in the mechanical drawing examples?",{"text":120,"@type":112},"The appendix shows an example configuration employing 4 inch diameter sampling probes and notes that higher sampling flow needs larger diameter tubing.","https://schema.org",{"og:url":83,"og:type":123,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":125,"canonical":83},"index,follow",{"doc_id":127,"site_id":62},674865,1793769604,{"code":4,"msg":5,"data":130},{"doc_id":127,"user_id":131,"nickname":92,"user_avatar":132,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":133,"file_id":134,"file_url":135,"file_type":136,"file_size":137,"view_count":4,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":138,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":128,"read_time":143},962090769181,"https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8","EPA  \nEPA OTM 33A Appendix B  \nGMAP-REQ-DA Mast System Mechanical Drawingsand Wiring Schematics  \nBy  \nEPA Office of Research and DevelopmentNational Risk Management Research LaboratoryAtmospheric Pollution Prevention and Control DivisionDurham NC,27711August,2014  \nContents  \n3  \n1.GMAP-REQ-DA Mast Systems mechanical drawings  \n1.1 Mast system assembly drawing4  \n1.2 Lower mount base plate5  \n1.3 Hinge block6  \n1.4 Hinge plate7  \n1.5 Hinge and lower mount hardware8  \n1.6 Base socket9  \n1.7 Mast pivot10  \n1.8 Mast connector11  \n1.9 Survey mount plate12  \n1.10 Survey mount body13  \n1.11 Compass mount14  \n1.12 Lower sight clamp15  \n1.13 Upper sight clamp16  \n1.14 Survey key17  \n1.15 Mast top cap18  \n1.16 Instrument crossbar19  \n1.17 Lower mast section20  \n1.18 Center mast section21  \n1.19 Upper mast section22  \n1.20 Mount base23  \n1.21 Lower assembly24  \n1.22 Center assembly25  \n1.23 Survey mount assembly26  \n1.24 Upper assembly27  \n1.25 Sample probe28  \n2.Control System Wiring Schematics for GMAP-REQ Systems29  \n2.1 System connection overview for EPA NEIC unit29  \n2.2 Equipment interface connections for EPA NEIC unit30  \n2.3 Mast interface connections for EPA NEIC unit31  \n2.4 System power connections for EPA NEIC unit32  \n33  \n2.5 Mast system connections for EPA R5 unit  \n# Introduction\n\nThe following appendix contains GMAP-REQ-DA mechanical system drawingsfor a vehicle-mounted mast system along with basic wiring controlschematics for a GMAP system.  These mast and control system exampleshave been deployed on several EPA-developed GMAP systems.  \nGeneral Disclaimer:The engineering and equipment descriptionscontained here are illustrative and do not constitute OTM 33A methodrequirements.Mention of trade names or commercial products does notconstitute endorsement or recommendation for use.  The equipmentdesigns and software published in this method and appendices are forinformational purposes only.  Adoption and or modification of the EPAGMAP engineering designs,software,or protocols are the soleresponsibility of the user.Deployment and safe-use of this method,engineering examples,or variations thereof is the sole responsibilityof the user.  No engineering or software design performance or safeuse guarantees are given or implied.  \n# 1.GMAP-REQ-DA Mast Systems mechanical drawings\n\nThe following appendix contains mechanical drawings of the EPA model 2GMAP mast system.  This mast system has been deployed on several EPA-developed GMAP systems.  The mast system shown here is for the  \nconfiguration employing 4 inch diameter sampling probes.  Concentrationmeasurement instruments(CMIs)that required higher sampling flow rateswill generally use larger diameter tubing.  \nGMAP-REQ-DA Mast System  \nMechaical Drawings and  \nOTM 33A Appndix B:  \nWiring Schematics  \nApoendx B:MechanicalDravirgs  \n\n| TOS rCollecton MSIAssmbl  \u003Cbr>SHEE  \u003Cbr>IDM Subassonbly Nane  \u003Cbr>2)  \u003Cbr>Raehr Mourt  \u003Cbr>21  \u003Cbr>2  \u003Cbr>MtLommSectian  \u003Cbr>22  \u003Cbr>3  \u003Cbr>Mne seoton  \u003Cbr>Snoy 5ado  \u003Cbr>23  \u003Cbr>4  \u003Cbr>24  \u003Cbr>Ma世USncfien  \u003Cbr>5  \u003Cbr>(3  \u003Cbr>(2   |  |  |  |  |\n| --- | --- | --- | --- | --- |\n|  |  | unon2102  \u003Cbr>e8%.219009  \u003Cbr>wwkdvonlomchcncam   | CO_LECTION MAST   |  |\n|  | ELaeson   |  | MOBLE EMISSNS MOHTTOR   |  |\n|  | 7Ncv11   |  | B szD6   | B  \u003Cbr>RN90020-001   |\n|  | 7DEC.11   |  | 0050   | SHEET I OF 25   |\n\n## 1.1 Mast system asembly drawing\n\nGMAP-REQ-DA Mast System  \nMechaical Drawings and  \nOTM 33A Appndix B:  \nWiring Schematics  \nAppendixB:Mechanical Drawings  \n\n| 6.00  \u003Cbr>R25  \u003Cbr>.50  \u003Cbr>1.00  \u003Cbr>.50  \u003Cbr>Ø0.75 THRU  \u003Cbr>JØ1.5  0.625  \u003Cbr>6.00π  \u003Cbr>2XØ.313亚.940  \u003Cbr>.50  \u003Cbr>3/8-16UNC-2B亚.750  \u003Cbr>3.00  \u003Cbr>.52  \u003Cbr>.50  \u003Cbr>ø.50   |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- |\n|  |  |  | 6061-T6 AL  \u003Cbr>AS MACHINED   |  |  |\n| 1.00   | UNLES$0TMERMSE 5PECFE0   |  |  |  |  |\n|  | uran   102  \u003Cbr>888.2190049  \u003Cbr>wwwkdyozomafloncom  \u003Cbr>BLAS0N   | LOWER MOUNT  \u003Cbr>BASE PLATE  \u003Cbr>MOBLE EMISSONS MONToR   |  |  |  |\n|  | 7-0o11   | sz8o","cbCaivKWoWFg57GS","https://ap.wps.com/l/cbCaivKWoWFg57GS","pdf",15835366,33,"English","# Introduction\n# 1. GMAP-REQ-DA Mast Systems mechanical drawings\n## 1.1 Mast system assembly drawing\n## 1.2 Lower mount base plate\n## 1.3 Hinge block\n## 1.4 Hinge plate\n## 1.5 Hinge and lower mount hardware\n## 1.6 Base socket\n## 1.7 Mast pivot\n## 1.8 Mast connector\n## 1.9 Survey mount plate\n## 1.10 Survey mount body\n## 1.11 Compass mount\n## 1.12 Lower sight clamp\n## 1.13 Upper sight clamp\n## 1.14 Survey key\n## 1.15 Mast top cap\n## 1.16 Instrument crossbar\n## 1.17 Lower mast section\n## 1.18 Center mast section\n## 1.19 Upper mast section\n## 1.20 Mount base\n## 1.21 Lower assembly\n## 1.22 Center assembly\n## 1.23 Survey mount assembly\n## 1.24 Upper assembly\n## 1.25 Sample probe\n# 2. Control System Wiring Schematics for GMAP-REQ Systems\n## 2.1 System connection overview for EPA NEIC unit\n## 2.2 Equipment interface connections for EPA NEIC unit\n## 2.3 Mast interface connections for EPA NEIC unit\n## 2.4 System power connections for EPA NEIC unit\n## 2.5 Mast system connections for EPA R5 unit","[{\"question\":\"What does GMAP-REQ-DA OTM 33A Appendix B include?\",\"answer\":\"It contains illustrative mechanical drawings for a vehicle-mounted mast system and basic wiring control schematics for a GMAP system.\"},{\"question\":\"Does the appendix define engineering requirements for OTM 33A?\",\"answer\":\"No. The document states the engineering and equipment descriptions are illustrative and do not constitute OTM 33A method requirements.\"},{\"question\":\"What mast configuration is shown in the mechanical drawing examples?\",\"answer\":\"The appendix shows an example configuration employing 4 inch diameter sampling probes and notes that higher sampling flow needs larger diameter tubing.\"}]","GMAP-REQ-DA Mast System - Mechanical Drawings - OTM 33A Appendix B - Wiring Schematics | PDF",83]