[{"data":1,"prerenderedAt":712},["ShallowReactive",2],{"site-footer-common":3,"glossary:cems":45,"glossary-related:cems":187},{"id":4,"extension":5,"footer":6,"meta":40,"navbar":41,"stem":43,"__hash__":44},"common\u002Fcommon.yml","yml",{"tagline":7,"links":8,"sections":9},"Acoustic cleaning intelligence for industrial fouling, soot, ash, dust and build-up.",[],[10,19,31],{"title":11,"links":12},"Product",[13,16],{"label":14,"to":15},"How it works","\u002F#product",{"label":17,"to":18},"Cost assessment","\u002F#hero",{"title":20,"links":21},"Company",[22,25,28],{"label":23,"to":24},"What we build","\u002F#about",{"label":26,"to":27},"Careers","\u002F#careers",{"label":29,"to":30},"Contact","\u002F#contact",{"title":32,"links":33},"Resources",[34,37],{"label":35,"to":36},"Blog","\u002Fresources\u002Fblog",{"label":38,"to":39},"Glossary","\u002Fglossary",{},{"links":42},[],"common","YocmZRy1AYfBbpgGVms-zhdiABlF8VTxHx6h4rDmZBA",{"id":46,"title":47,"aliases":48,"body":51,"category":167,"description":168,"extension":169,"meta":170,"navigation":171,"path":172,"relatedTerms":173,"seo":177,"sources":180,"stem":184,"term":185,"__hash__":186},"glossary\u002Fglossary\u002Fcems.md","Continuous Emissions Monitoring System (CEMS)",[49,50],"CEMS","continuous emissions monitor",{"type":52,"value":53,"toc":160},"minimark",[54,77,82,85,112,116,134,138],[55,56,57,58,61,62,67,68,67,72,76],"p",{},"A ",[59,60,47],"strong",{}," is the suite of instruments that measures stack emissions in real time. A typical industrial CEMS measures ",[63,64,66],"a",{"href":65},"\u002Fglossary\u002Fopacity","opacity",", ",[63,69,71],{"href":70},"\u002Fglossary\u002Fparticulate-matter","particulate matter",[63,73,75],{"href":74},"\u002Fglossary\u002Fnox-sox-co","NOx, SOx, CO",", O₂, moisture and gas flow. CEMS data is the primary basis for environmental-compliance reporting under most jurisdictions' emission permits.",[78,79,81],"h2",{"id":80},"cems-quality-assurance","CEMS quality assurance",[55,83,84],{},"CEMS instruments are governed by quality-assurance frameworks:",[86,87,88,100,106],"ul",{},[89,90,91,94,95,99],"li",{},[59,92,93],{},"EU"," — ",[63,96,98],{"href":97},"\u002Fglossary\u002Fen-14181-en-13284","EN 14181"," (QAL1, QAL2, QAL3 and AST)",[89,101,102,105],{},[59,103,104],{},"US"," — EPA Reference Method 6, 7, 19 etc. plus Part 75 CEMS requirements",[89,107,108,111],{},[59,109,110],{},"National regulators"," — various local specifics",[78,113,115],{"id":114},"how-cleaning-intersects-with-cems-data","How cleaning intersects with CEMS data",[55,117,118,119,123,124,128,129,133],{},"Operators see fouling-driven degradation of ",[63,120,122],{"href":121},"\u002Fglossary\u002Felectrostatic-precipitator","ESP"," or ",[63,125,127],{"href":126},"\u002Fglossary\u002Fbaghouse","baghouse"," performance in near-real-time on the CEMS trace. A rising opacity baseline, more frequent excursions, or trended particulate increase all indicate worsening collection. Active ",[63,130,132],{"href":131},"\u002Fglossary\u002Fsonic-horn","sonic-horn"," cleaning that defends collection efficiency shows up on CEMS as flatter, lower, more predictable traces.",[78,135,137],{"id":136},"related-terms","Related terms",[86,139,140,145,150,155],{},[89,141,142],{},[63,143,144],{"href":65},"Opacity",[89,146,147],{},[63,148,149],{"href":70},"Particulate matter",[89,151,152],{},[63,153,154],{"href":74},"NOx \u002F SOx \u002F CO",[89,156,157],{},[63,158,159],{"href":97},"EN 14181 \u002F EN 13284",{"title":161,"searchDepth":162,"depth":162,"links":163},"",2,[164,165,166],{"id":80,"depth":162,"text":81},{"id":114,"depth":162,"text":115},{"id":136,"depth":162,"text":137},"kpis-measurements","A Continuous Emissions Monitoring System (CEMS) is the suite of instruments that measures stack emissions in real time. A typical industrial CEMS measures opacity, particulate matter, NOx, SOx, CO, O₂, moisture and gas flow. CEMS data is the primary basis for environmental-compliance reporting under most jurisdictions' emission permits.","md",{},true,"\u002Fglossary\u002Fcems",[66,174,175,176],"particulate-matter","nox-sox-co","en-14181-en-13284",{"title":178,"description":179},"Continuous Emissions Monitoring System (CEMS) — real-time stack emissions measurement","CEMS instruments measure stack emissions in real time — opacity, PM, NOx, SOx, CO, O2, moisture — providing the data on which environmental compliance is judged.",[181],{"title":182,"url":183},"Wikipedia — Continuous emissions monitoring system","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FContinuous_emissions_monitoring_system","glossary\u002Fcems","Continuous Emissions Monitoring System","d4nlsLBIEd3NGEvGY4Qyqp_PhX2UOjgAnwxx__vQ_V4",[188,296,444,633],{"id":189,"title":144,"aliases":190,"body":193,"category":167,"description":281,"extension":169,"meta":282,"navigation":171,"path":65,"relatedTerms":283,"seo":286,"sources":289,"stem":293,"term":294,"__hash__":295},"glossary\u002Fglossary\u002Fopacity.md",[191,192],"stack opacity","opacity excursion",{"type":52,"value":194,"toc":276},[195,203,207,210,243,247,253,255],[55,196,197,199,200,202],{},[59,198,144],{}," is the percentage of light obscured by particulate matter in stack flue gas, measured continuously by a transmissometer (opacity monitor) installed in the stack. Opacity is the headline visual KPI for ",[63,201,122],{"href":121}," performance and is permit-limited in most jurisdictions — typically 20–40% on a 6-minute rolling average, with absolute peaks limited to 60% for shorter periods.",[78,204,206],{"id":205},"opacity-excursions","Opacity excursions",[55,208,209],{},"Opacity excursions are typically driven by:",[86,211,212,224,230,237,240],{},[89,213,214,218,219,223],{},[63,215,217],{"href":216},"\u002Fglossary\u002Fesp-rapper","ESP rapping"," ",[63,220,222],{"href":221},"\u002Fglossary\u002Fre-entrainment","re-entrainment"," puffs",[89,225,226,229],{},[63,227,228],{"href":126},"Baghouse"," bag failure (sudden particulate breakthrough)",[89,231,232,236],{},[63,233,235],{"href":234},"\u002Fglossary\u002Fback-corona","ESP back-corona"," collapse",[89,238,239],{},"Combustion upsets producing unusually high inlet particulate",[89,241,242],{},"Soot-blower-triggered re-entrainment",[78,244,246],{"id":245},"how-sonic-horns-reduce-opacity","How sonic horns reduce opacity",[55,248,249,252],{},[63,250,251],{"href":131},"Sonic horns"," deliver continuous gentle dust release rather than periodic aggressive rapping puffs. Plants retrofitting horns on opacity-limited ESPs commonly see 20–40% opacity-peak reduction without other changes — the headline business case for many sonic-horn ESP installations.",[78,254,137],{"id":136},[86,256,257,261,266,271],{},[89,258,259],{},[63,260,49],{"href":172},[89,262,263],{},[63,264,265],{"href":121},"Electrostatic precipitator",[89,267,268],{},[63,269,270],{"href":221},"Re-entrainment",[89,272,273],{},[63,274,275],{"href":131},"Sonic horn",{"title":161,"searchDepth":162,"depth":162,"links":277},[278,279,280],{"id":205,"depth":162,"text":206},{"id":245,"depth":162,"text":246},{"id":136,"depth":162,"text":137},"Opacity is the percentage of light obscured by particulate matter in stack flue gas, measured continuously by a transmissometer (opacity monitor) installed in the stack. Opacity is the headline visual KPI for ESP performance and is permit-limited in most jurisdictions — typically 20–40% on a 6-minute rolling average, with absolute peaks limited to 60% for shorter periods.",{},[284,285,222,132],"cems","electrostatic-precipitator",{"title":287,"description":288},"Opacity — visual stack-emission KPI measured by continuous monitor","Opacity is the percentage of light obscured by particulate in stack flue gas. The headline visual KPI for ESP performance; continuously monitored and permit-limited.",[290],{"title":291,"url":292},"Wikipedia — Opacity","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FOpacity_(optics)","glossary\u002Fopacity","Opacity (stack)","-4RIuJbd3zg7kip6GHWTZ5efGSK8D9bOiK_nb9oMGWo",{"id":297,"title":298,"aliases":299,"body":305,"category":167,"description":431,"extension":169,"meta":432,"navigation":171,"path":70,"relatedTerms":433,"seo":435,"sources":438,"stem":442,"term":149,"__hash__":443},"glossary\u002Fglossary\u002Fparticulate-matter.md","Particulate matter (PM)",[300,301,302,303,304],"PM","PM10","PM2.5","PM1","particulate",{"type":52,"value":306,"toc":426},[307,312,373,377,390,394,404,406],[55,308,309,311],{},[59,310,298],{}," is airborne solid or liquid particulate. PM is categorised by aerodynamic diameter:",[313,314,315,331],"table",{},[316,317,318],"thead",{},[319,320,321,325,328],"tr",{},[322,323,324],"th",{},"Category",[322,326,327],{},"Diameter",[322,329,330],{},"Health and capture significance",[332,333,334,351,362],"tbody",{},[319,335,336,340,343],{},[337,338,339],"td",{},"PM₁₀",[337,341,342],{},"\u003C 10 µm",[337,344,345,346,348,349],{},"Inhalable; permit-limited; captured by ",[63,347,122],{"href":121}," and ",[63,350,127],{"href":126},[319,352,353,356,359],{},[337,354,355],{},"PM₂.₅",[337,357,358],{},"\u003C 2.5 µm",[337,360,361],{},"Respirable; tighter permit limits; demands high-efficiency control",[319,363,364,367,370],{},[337,365,366],{},"PM₁",[337,368,369],{},"\u003C 1 µm",[337,371,372],{},"Reaches deep lung; most health-significant; hardest to capture",[78,374,376],{"id":375},"smaller-pm-is-harder-to-capture","Smaller PM is harder to capture",[55,378,379,380,384,385,389],{},"ESPs and baghouses both capture larger particulate more easily than smaller. PM₁ capture demands either ",[63,381,383],{"href":382},"\u002Fglossary\u002Fptfe-membrane-filter-bag","PTFE-membrane bags"," (baghouse) or carefully-tuned ESP fields with adequate ",[63,386,388],{"href":387},"\u002Fglossary\u002Fspecific-collection-area","SCA",". Fouling that degrades either system has its first visible impact on fine PM penetration.",[78,391,393],{"id":392},"sonic-horns-and-pm-control","Sonic horns and PM control",[55,395,396,398,399,403],{},[63,397,251],{"href":131}," preserve ESP and baghouse collection efficiency across the operating cycle by preventing the dust-layer thickening or ",[63,400,402],{"href":401},"\u002Fglossary\u002Fbag-blinding","bag blinding"," that would otherwise compromise fine-PM capture.",[78,405,137],{"id":136},[86,407,408,412,416,420],{},[89,409,410],{},[63,411,144],{"href":65},[89,413,414],{},[63,415,265],{"href":121},[89,417,418],{},[63,419,228],{"href":126},[89,421,422],{},[63,423,425],{"href":424},"\u002Fglossary\u002Fmass-loading","Mass loading",{"title":161,"searchDepth":162,"depth":162,"links":427},[428,429,430],{"id":375,"depth":162,"text":376},{"id":392,"depth":162,"text":393},{"id":136,"depth":162,"text":137},"Particulate matter (PM) is airborne solid or liquid particulate. PM is categorised by aerodynamic diameter:",{},[66,285,127,434],"mass-loading",{"title":436,"description":437},"Particulate matter (PM, PM10, PM2.5) — regulated airborne particulate","Particulate matter is regulated airborne particulate. PM10 = below 10 µm aerodynamic diameter; PM2.5 = below 2.5 µm; PM1 = below 1 µm. Smaller is more health-significant and harder to capture.",[439],{"title":440,"url":441},"Wikipedia — Particulate matter","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FParticulate_matter","glossary\u002Fparticulate-matter","IlViiL35TtRKwPE6q8ke7mjs_8OgrFqWieHPTbI0g4g",{"id":445,"title":154,"aliases":446,"body":454,"category":167,"description":618,"extension":169,"meta":619,"navigation":171,"path":74,"relatedTerms":620,"seo":623,"sources":626,"stem":630,"term":631,"__hash__":632},"glossary\u002Fglossary\u002Fnox-sox-co.md",[447,448,449,450,451,452,453],"NOx","SOx","SO2","CO emissions","nitrogen oxides","sulphur oxides","carbon monoxide",{"type":52,"value":455,"toc":613},[456,474,478,554,558,563,590,592],[55,457,458,460,461,463,464,467,468,470,471,473],{},[59,459,447],{}," (nitrogen oxides — NO and NO₂), ",[59,462,448],{}," (sulphur oxides — primarily SO₂ with smaller SO₃), and ",[59,465,466],{},"CO"," (carbon monoxide) are the principal regulated gaseous emissions from combustion plants, alongside ",[63,469,71],{"href":70},". All three are measured continuously by ",[63,472,49],{"href":172}," and permit-limited under most jurisdictions' emission codes.",[78,475,477],{"id":476},"sources-and-controls","Sources and controls",[313,479,480,493],{},[316,481,482],{},[319,483,484,487,490],{},[322,485,486],{},"Pollutant",[322,488,489],{},"Formation",[322,491,492],{},"Control",[332,494,495,516,529,542],{},[319,496,497,501,504],{},[337,498,499],{},[59,500,447],{},[337,502,503],{},"Thermal NOx (high flame temperature) + fuel NOx",[337,505,506,507,511,512],{},"Combustion control + ",[63,508,510],{"href":509},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR"," \u002F ",[63,513,515],{"href":514},"\u002Fglossary\u002Fselective-non-catalytic-reduction","SNCR",[319,517,518,523,526],{},[337,519,520],{},[59,521,522],{},"SO₂",[337,524,525],{},"Fuel sulphur oxidation",[337,527,528],{},"Fuel selection + FGD (wet scrubber, dry sorbent injection)",[319,530,531,536,539],{},[337,532,533],{},[59,534,535],{},"SO₃",[337,537,538],{},"Catalytic oxidation of SO₂ over V₂O₅ in SCR",[337,540,541],{},"Catalyst formulation + temperature control",[319,543,544,548,551],{},[337,545,546],{},[59,547,466],{},[337,549,550],{},"Incomplete combustion",[337,552,553],{},"Combustion control (excess air, residence time, temperature)",[78,555,557],{"id":556},"how-cleaning-affects-gaseous-emissions","How cleaning affects gaseous emissions",[55,559,560,562],{},[63,561,251],{"href":131}," do not directly capture gaseous pollutants but support gaseous-emission control indirectly:",[86,564,565,574,585],{},[89,566,567,569,570,573],{},[59,568,447],{}," — clean ",[63,571,572],{"href":509},"SCR catalysts"," achieve their rated NOx reduction; fouled catalysts under-perform",[89,575,576,579,580,584],{},[59,577,578],{},"SO₃ and downstream ABS"," — keeping the cold end clean reduces ",[63,581,583],{"href":582},"\u002Fglossary\u002Fammonium-bisulphate","ammonium-bisulphate"," accumulation",[89,586,587,589],{},[59,588,466],{}," — preserved boiler performance maintains stable combustion",[78,591,137],{"id":136},[86,593,594,599,603,607],{},[89,595,596],{},[63,597,598],{"href":509},"Selective Catalytic Reduction (SCR)",[89,600,601],{},[63,602,49],{"href":172},[89,604,605],{},[63,606,144],{"href":65},[89,608,609],{},[63,610,612],{"href":611},"\u002Fglossary\u002Findustrial-emissions-directive","Industrial Emissions Directive (IED)",{"title":161,"searchDepth":162,"depth":162,"links":614},[615,616,617],{"id":476,"depth":162,"text":477},{"id":556,"depth":162,"text":557},{"id":136,"depth":162,"text":137},"NOx (nitrogen oxides — NO and NO₂), SOx (sulphur oxides — primarily SO₂ with smaller SO₃), and CO (carbon monoxide) are the principal regulated gaseous emissions from combustion plants, alongside particulate matter. All three are measured continuously by CEMS and permit-limited under most jurisdictions' emission codes.",{},[621,284,66,622],"selective-catalytic-reduction","industrial-emissions-directive",{"title":624,"description":625},"NOx, SOx and CO — the principal regulated gaseous combustion emissions","NOx (nitrogen oxides), SOx (sulphur oxides) and CO (carbon monoxide) are the principal regulated gaseous emissions from combustion plants. Continuously measured by CEMS.",[627],{"title":628,"url":629},"Wikipedia — NOx","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FNOx","glossary\u002Fnox-sox-co","NOx, SOx and CO emissions","9pJ6fb01njwEN5SRakWsRmyc0WBaWxUnIeQ3cnLm7Xc",{"id":634,"title":635,"aliases":636,"body":639,"category":698,"description":699,"extension":169,"meta":700,"navigation":171,"path":97,"relatedTerms":701,"seo":702,"sources":705,"stem":709,"term":710,"__hash__":711},"glossary\u002Fglossary\u002Fen-14181-en-13284.md","EN 14181 \u002F EN 13284 (CEMS \u002F particulate)",[98,637,638],"EN 13284","CEMS QAL",{"type":52,"value":640,"toc":694},[641,649,653,656,670,678,680],[55,642,643,645,646,648],{},[59,644,98],{}," sets the European quality-assurance levels (QAL1, QAL2, QAL3 and AST) for continuous emissions monitoring systems (CEMS) installed on stationary industrial sources. ",[59,647,637],{}," covers manual reference methods for low-range particulate determination — typically used as the reference method against which the CEMS is calibrated.",[78,650,652],{"id":651},"why-they-matter-operationally","Why they matter operationally",[55,654,655],{},"Industrial operators in the EU must:",[86,657,658,661,664,667],{},[89,659,660],{},"Install QAL1-certified CEMS instruments",[89,662,663],{},"Perform QAL2 site calibration against EN 13284 reference measurements",[89,665,666],{},"Conduct QAL3 daily drift checks",[89,668,669],{},"Schedule AST (Annual Surveillance Test) once a year",[55,671,672,673,67,675,677],{},"Performance of upstream particulate-control equipment (",[63,674,122],{"href":121},[63,676,127],{"href":126},") shows up in the CEMS trace. Any drift in collection efficiency from fouling immediately appears as a rising particulate signal — making the case for active cleaning visible to operators in near-real-time.",[78,679,137],{"id":136},[86,681,682,686,690],{},[89,683,684],{},[63,685,144],{"href":65},[89,687,688],{},[63,689,265],{"href":121},[89,691,692],{},[63,693,228],{"href":126},{"title":161,"searchDepth":162,"depth":162,"links":695},[696,697],{"id":651,"depth":162,"text":652},{"id":136,"depth":162,"text":137},"standards-regulations","EN 14181 sets the European quality-assurance levels (QAL1, QAL2, QAL3 and AST) for continuous emissions monitoring systems (CEMS) installed on stationary industrial sources. EN 13284 covers manual reference methods for low-range particulate determination — typically used as the reference method against which the CEMS is calibrated.",{},[66,285,127],{"title":703,"description":704},"EN 14181 and EN 13284 — European CEMS quality assurance and low-range particulate measurement","EN 14181 sets European quality-assurance levels for stationary-source CEMS. EN 13284 covers manual reference methods for low-range particulate determination.",[706],{"title":707,"url":708},"BSI — EN 14181","https:\u002F\u002Fwww.bsigroup.com\u002F","glossary\u002Fen-14181-en-13284","EN 14181 and EN 13284","SepvnkFack-r-g5FVkzJgSsXBq5N8GNtYbmMPShcTy0",1782613744420]