[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-398703-105":59,"doc-detail-398703-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","npet-001-application-examples-in-use-application-note","NPET-001 - Application Examples - In-Use Application Note","","TSI Nanoparticle Emission Tester (NPET) model 3795 measures solid particle concentration in engine exhaust by number, supporting in-use after-treatment certification, inspection and maintenance, and emissions research. The built-in diluter, catalytic stripper, and CPC provide accurate, repeatable SPN readings from tailpipe samples downstream of DPF. Example applications include NRMM testing, stationary generator DPF verification, and bus fleet evaluations in Santiago, comparing NPET sensitivity with opacimeter opacity results.",{"@graph":69,"@context":122},[70,84,105],{"@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/npet-001-application-examples-in-use-application-note/398703/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/npet-001-application-examples-in-use-application-note/398703.png","ImageObject",300,407,{"name":92,"@type":93},"McGucket","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-20","2026-09-27",true,{"@type":102,"interactionType":103,"userInteractionCount":19},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What does the NPET model 3795 measure, and how is it measured?","Question",{"text":112,"@type":113},"It measures solid particle number concentration (SPN) in engine exhaust. The sample is diluted, semi-volatile particles are removed using a catalytic stripper, and remaining solids are quantified using a CPC.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How is the NPET used for non-road mobile machinery certification testing?",{"text":117,"@type":113},"It is used to test non-road mobile machinery against Swiss Regulation SR 941.242, ensuring DPFs continue functioning during equipment life. The document provides an example on a Bobcat loader measuring SPN at idle.",{"name":119,"@type":110,"acceptedAnswer":120},"How does NPET performance compare with opacimeter measurements in bus fleet trials?",{"text":121,"@type":113},"In the Santiago campaign, all buses passed the opacity standard of 0.24 m-1, but only three passed the Swiss SPN limit of 2.5 x 105 cm-3. One bus failed NPET but passed opacity with nearly identical opacity readings, showing NPET’s higher sensitivity.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},398703,1790906721,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":19,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":19,"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":143,"read_time":52},1236954412713,"https://us-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","TSI® NANOPARTICLE EMISSION  \nTESTER (NPET) MODEL 3795 IN-USE APPLICATION EXAMPLES  \nAPPLICATION NOTE NPET-001 (A4)  \nIntroduction  \nThe TSI Nanoparticle Emission Tester (NPET) model 3795 is a powerful tool developed to measure the concentration (by number) of solid particles in engine exhaust. Designed for in-use after-treatment certification, inspection and maintenance, as well as emissions research, the NPET quickly determines the condition of diesel particulate filters (DPF) by measuring the raw exhaust directly from the tailpipe downstream ofthe DPF. The NPET’s built-in diluter, catalytic stripper, and condensation particle counter (CPC) allow for easy measurement of the solid particle number concentration (SPN) from a variety of combustion sources such as non-road mobile machinery (NRMM), stationary generators, and both light-duty and heavy-duty on-road vehicles. This application note briefly describes the operating principle of the NPET and highlights a few in-use application examples.  \nOperating Principle  \nAs shown in Figure 1, the NPET’s sample probe dilutes a sample of exhaust. The diluted sample is drawn through a catalytic stripper to remove semi-volatile particles through evaporation and oxidation. The concentration of the remaining solid particles is then measured using a CPC. The use of CPC technology (the same measurement principle used in PMP testing) allows for accurate, repeatable measurements.  \nFigure 1: Model 3795 Instrument Schematic  \nExample Applications  \nNon-road Mobile Machinery  \nThe NPET is certified by the Swiss institute of metrology (METAS) to test to Swiss Regulation 941.242, which mandates the bi-annual testing of all non-road mobile machinery (NRMM) to ensure that the DPFs are continuing to function throughout the life of the equipment. Figure 2 shows the NPET being used to measure the SPN of a Bobcat loader with diesel oxidation catalyst (DOC) and DPF, and an example of an official SR 941.242 report. At idle, the loader passed the SR 941.242 limit of  \n2.5 x 105 cm-3 with an SPN of 5.06 x 104 cm-3 .  \nFigure 2: NPET measuring exhaust of a Tier 4 Bobcat A770 at idle and corresponding official test report  \nStationary Generators  \nTwo configurations of DPFs for stationary generators were tested with NPET to determine the concentration of solid particles passing through the DPF system. Both systems were Level 3 Verified by the California Air Resources Board (ARB), indicating that the DPF designs remove greater than 85% of the particulate mass emitted by the engine. Figure 3 shows NPET measuring downstream of one of the DPFs mounted toa 6.8L John Deere™ PowerTech™ diesel stationary generator. Before testing, the filters were loaded and then regenerated. The tests were performed at engine idle, immediately after regeneration. With no soot layer present immediately after regeneration, this condition was representative of a worst-case particle emission condition for an intact filter. Even in this condition, the systems emitted 3.00 x 103 cm-3 and 4.30x103 cm-3 respectively.  \nFigure 3: NPET measuring DPF condition of a John Deere 6068TF275 diesel engine stationary generator  \nBus Fleets  \nSince 2010, all new buses in Santiago, Chile have been required to be equipped with DPF. Plans are in place for the entire Transantiago bus fleet to be equipped with DPFs by the end of 2018. Figure 4 shows the NPET being used by the Transport Minister to evaluate the condition ofthe DPF of a bus at a stop during its regular route during an initial NPET evaluation in April 2015.  \nFigure 4: The emissions of solid particles from a bus in Santiago, Chile are measured to determine the condition ofthe DPF  \nFigure 5: Measurements of solid particle numbers emitted by bus BJFY4 at idle and during free accelerations  \nDuring this campaign, five buses were measured on route. Each bus was stopped, and the 40-second official SR 941.242 test was run with the NPET. Following this test, the in-place opacimeter test was run wi","cbCaimvL5BgIj6Lq","https://ap.wps.com/l/cbCaimvL5BgIj6Lq","pdf",660498,"English","# Introduction\n# Operating Principle\n# Example Applications\n## Non-road Mobile Machinery\n## Stationary Generators\n## Bus Fleets\n# Conclusion","[{\"question\":\"What does the NPET model 3795 measure, and how is it measured?\",\"answer\":\"It measures solid particle number concentration (SPN) in engine exhaust. The sample is diluted, semi-volatile particles are removed using a catalytic stripper, and remaining solids are quantified using a CPC.\"},{\"question\":\"How is the NPET used for non-road mobile machinery certification testing?\",\"answer\":\"It is used to test non-road mobile machinery against Swiss Regulation SR 941.242, ensuring DPFs continue functioning during equipment life. The document provides an example on a Bobcat loader measuring SPN at idle.\"},{\"question\":\"How does NPET performance compare with opacimeter measurements in bus fleet trials?\",\"answer\":\"In the Santiago campaign, all buses passed the opacity standard of 0.24 m-1, but only three passed the Swiss SPN limit of 2.5 x 105 cm-3. One bus failed NPET but passed opacity with nearly identical opacity readings, showing NPET’s higher sensitivity.\"}]","NPET-001 - Application Examples - In-Use Application Note | PDF",1790488277]