When is continuous NOx measurement mandatory in a CHP unit? | Electricity feeeta name="description" content="When is continuous NOx measurement mandatory in a CHP unit? From a certain combustion power, the BImSchG requires continuous emission measurement; NOx limit for biogas gas engines: 650 mg/m³ — Exceeded"> <link rel="canonical" href="https://stromfee-mauritius.ai/en/glaesern/cogeneration/wizards/frage_nox_grenzwert_ueberwachen/"> <script type="application/ld+json">{"@context": "https://schema.org", "@type": "Article", "headline": "When is continuous NOx measurement mandatory in a CHP unit?", "mainEntityOfPage": "/glaesern/cogeneration/wizards/frage_nox_grenzwert_ueberwachen.html", "description": "From a certain firing capacity, the BImSchG prescribes continuous emission measurement; NOx limit value for biogas gas engines: 650 mg/m³ — Exceedances must be reported and can lead to"}</script> <script type="application/ld+json">{"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "What is the limit for NOx in a CHP unit?", "acceptedAnswer": {"@type": "Answer", "text": "The limit for nitrogen oxides in biogas gas engines is typically 650 mg/m³."}}, {"@type": "Question", "name": "From what power level is continuous measurement mandatory?", "acceptedAnswer": {"@type": "Answer", "text": "The obligation for continuous measurement stems from the BImSchG based on the installed combustion power of the plant."}}, {"@type": "Question", "name": "Why must NOx be monitored continuously in a CHP unit?", "acceptedAnswer": {"@type": "Answer", "text": "Monitoring serves to comply with legal limits and to verify the operation of the exhaust gas post-treatment."}}, {"@type": "Question", "name": "What happens in case of exceeding the NOx limit?", "acceptedAnswer": {"@type": "Answer", "text": "Exceedances must be reported and can lead to immediate operating restrictions or shutdowns."}}, {"@type": "Question", "name": "How is the quality of the catalyst evaluated?", "acceptedAnswer": {"@type": "Answer", "text": "Comparing the live measured value (e.g. 469.3 mg/m³) with the limit provides information on the status of the catalytic cleaning."}}, {"@type": "Question", "name": "What role does measurement play in maintenance planning?", "acceptedAnswer": {"@type": "Answer", "text": "Trend analyses of NOx values allow for predicting component wear and accurately planning maintenance intervals."}}]}</script> <style>:root{--bg:#fdfcff;--bg-soft:#faf8ff;--surface:#fff;--text:#1d1d1f;--text-2:#515154;--text-3:#86868b;--border:#fed7aa;--border-soft:#efeaf8;--accent:#f97316;--accent-bright:#fdba74;--accent-dim:rgba(234,88,12,.08);--emerald:#ea580c;--font:'Inter',-apple-system,sans-serif;--mono:'JetBrains Mono',monospace;--radius:16px}*{box-sizing:border-box;margin:0;padding:0} body{background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.6; -webkit-font-smoothing:antialiased} .wrap{max-width:1080px;margin:0 auto;padding:0 24px} header{padding:14px 0;border-bottom:1px solid var(--border-soft);background:rgba(255,255,255,.72); backdrop-filter:saturate(180%) 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.benefit{background:linear-gradient(135deg,#fff7f0,#fff);border:1px solid var(--accent-ultra);border-radius:18px;padding:1.3rem 1.4rem;margin:.2rem 0 1.1rem} .benefit h3{margin:0 0 .5rem;font-size:1.2rem;font-weight:800;color:var(--text,#1d1d1f)} .benefit p{margin:0;color:var(--text-2,#515154);line-height:1.6}</style></head><body> <header class="site"><div class="wrap navrow"> <a class="brand" href="/glaesern/">◈ Transparent CHP</a> <nav class="nlinks"><a href="/glaesern/">All trades</a> <a href="/glaesern/cogeneration/abgas.html">Exhaust gas & Emission</a></nav> <a class="navcta" href="#kontakt">Plant check →</a></div></header> <div class="hero-w"><h1>When must NOx be measured continuously?</h1><p>Component Wizard · Exhaust gas & Emission</p> <div class="livebar"><span class="livedot"></span><b id="lcount2">…</b>Live measurement values from the plant ·<span id="lts2"> verbinde… </span></div></div> <div class="wiz-wrap"> <div id="steps"> <div class="st" data-s="1"><span class="no">1</span> Comprendre </div> <div class="st" data-s="2"><span class="no">2</span>View live</div> <div class="st" data-s="3"><span class="no">3</span>What AI does</div> <div class="st" data-s="4"><span class="no">4</span>Your benefit</div> </div> <div id="body"></div> </div> <div class="sec"><h2>Diagram — Process & sensors live</h2><p class="lead">The path through the area, with the actual measurement points of the plant.</p><svg viewBox="0 0 920 300" style="width:100%;height:auto;background:#fdfcff;border:1px solid #fed7aa;border-radius:16px"><defs><linearGradient id="bx" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#fff"/><stop offset="1" stop-color="#fff7ed"/></linearGradient><marker id="ar" markerWidth="8" markerHeight="8" refX="6" refY="3" orient="auto"><path d="M0,0 L6,3 L0,6 Z" fill="#f97316"/></marker></defs><text x="20" y="30" font-size="14" font-weight="800" fill="#ea580c">Exhaust gas & Emission — Process diagram</text><text x="20" y="48" font-size="10.5" fill="#86868b">orange = live plant sensor · flow from left to right</text><line x1="138" y1="152" x2="204" y2="152" stroke="#f97316" stroke-width="2.5" marker-end="url(#ar)"/><line x1="328" y1="152" x2="395" y2="152" stroke="#f97316" stroke-width="2.5" marker-end="url(#ar)"/><line x1="519" y1="152" x2="586" y2="152" stroke="#f97316" stroke-width="2.5" marker-end="url(#ar)"/><line x1="710" y1="152" x2="776" y2="152" stroke="#f97316" stroke-width="2.5" marker-end="url(#ar)"/><g><rect x="20" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="79" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f"> Motor </text></g><g><rect x="210" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="270" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f"> Turbolader </text></g><g><rect x="401" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="460" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f"><tspan x="460" dy="-4"></tspan><tspan x="460" dy="14"> Oxi-Katalysator </tspan></text><text x="460" y="170" text-anchor="middle" font-size="10.5" fill="#86868b"> Reinigung </text></g><g><rect x="592" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="650" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f"> Abgas-WRG </text><text x="650" y="170" text-anchor="middle" font-size="10.5" fill="#86868b"> Wärme </text></g><g><rect x="782" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="841" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f"> Kamin </text></g><line x1="270" y1="120" x2="270" y2="88" stroke="#ea580c" stroke-width="1.5" stroke-dasharray="3 2"/><circle cx="270" cy="120" r="3.5" fill="#ea580c"/><g transform="translate(270,58)"><rect x="-52" y="0" width="104" height="30" rx="8" fill="#fff" stroke="#ea580c" stroke-width="1"/><text x="0" y="12" text-anchor="middle" font-size="8.5" fill="#86868b">before Turbo</text><text x="0" y="25" text-anchor="middle" font-size="12" font-weight="700" fill="#ea580c" class="svlive" data-k="sbhkw2_rabgastemp_nturbo" data-u="°C">…</text></g><line x1="460" y1="120" x2="406" y2="88" stroke="#ea580c" stroke-width="1.5" stroke-dasharray="3 2"/><circle cx="460" cy="120" r="3.5" fill="#ea580c"/><g transform="translate(406,58)"><rect x="-52" y="0" width="104" height="30" rx="8" fill="#fff" stroke="#ea580c" stroke-width="1"/><text x="0" y="12" text-anchor="middle" font-size="8.5" fill="#86868b">before Cat</text><text x="0" y="25" text-anchor="middle" font-size="12" font-weight="700" fill="#ea580c" class="svlive" data-k="sbhkw2_rtemp_vkat" data-u="°C">…</text></g><line x1="460" y1="120" x2="514" y2="88" stroke="#ea580c" stroke-width="1.5" stroke-dasharray="3 2"/><circle cx="460" cy="120" r="3.5" fill="#ea580c"/><g transform="translate(514,58)"><rect x="-52" y="0" width="104" height="30" rx="8" fill="#fff" stroke="#ea580c" stroke-width="1"/><text x="0" y="12" text-anchor="middle" font-size="8.5" fill="#86868b">after Cat</text><text x="0" y="25" text-anchor="middle" font-size="12" font-weight="700" fill="#ea580c" class="svlive" data-k="sbhkw2_rtemp_nkat" data-u="°C">…</text></g></svg></div> <div class="sec"><div class="block"><h3>Thus we connect — read only</h3><p class="step-p">The value comes from<b>Modbus TCP · Plant PLC · M-Bus (meters)</b>of the plant —<b>read, not controlled</b>. Everything is<b>in the house</b>calculated, nothing leaves the house. No obligation to disclose operational data.</p></div><div class="block"><h3>Your own LLM for CHP — offline</h3><p class="step-p">Questions in plain language, answered by<b>Your own installation data</b>— local, no cloud. The AI runs internally; the installation remains yours.</p></div><div class="note"><b>Regulatory framework:</b>TA Luft · environmental impact assessment (EIA) (sections 2910/2921) · DIN EN 15267 (Measurement of emissions)</div><div class="block"><h3>Associated causal chains</h3><p class="step-p">This component is part of<a href="https://bhkw-anlagen.com/kausalketten.html" style="color:var(--accent)">Installation causal chains</a>— from cause to effect (gas quality → engine → exhaust gas → heat → efficiency). The AI reads the entire chain, not just the individual value.</p></div><div class="block"><h3>Link with the entire installation</h3><p class="step-p">A CHP unit is never alone: electricity, heat and gas are linked, and with PV and battery storage, it becomes a system. The AI calculates the entire installation.</p><div style="display:flex;gap:.6rem;flex-wrap:wrap;margin-top:.6rem"><a href="/glaesern/cogeneration/" style="font-size:.85rem;padding:.4rem .9rem;border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--accent)">BESS transparent →</a><a href="/glaesern/hotel/" style="font-size:.85rem;padding:.4rem .9rem;border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--accent)">Gläsernes Hotel →</a><a href="/fr/pv-watcher/" style="font-size:.85rem;padding:.4rem .9rem;border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--accent)">PV-Watcher →</a></div></div></div><div class="sec faqsec"><h2>Frequently asked questions</h2><details><summary>What is the limit for NOx in a CHP unit?</summary><div class="faq-a">The limit for nitrogen oxides in biogas gas engines is typically 650 mg/m³.</div></details><details><summary>From what power level is continuous measurement mandatory?</summary><div class="faq-a">The obligation for continuous measurement stems from the BImSchG based on the installed combustion power of the installation.</div></details><details><summary>Why must NOx be monitored continuously in a CHP unit?</summary><div class="faq-a">Monitoring serves to comply with legal limits and to verify the operation of the exhaust gas post-treatment.</div></details><details><summary>What happens if the NOx limit is exceeded?</summary><div class="faq-a">Exceedances must be reported and can lead to immediate operating restrictions or shutdowns.</div></details><details><summary>How is the quality of the catalyst evaluated?</summary><div class="faq-a">Comparing the live measured value (e.g. 469.3 mg/m³) with the limit provides information on the status of the catalytic cleaning.</div></details><details><summary>What role does measurement play in maintenance planning?</summary><div class="faq-a">Trend analysis of NOx values allows for predicting component wear and accurately planning maintenance intervals.</div></details></div> <footer class="site"><div class="wrap"> <div class="fbrand">◈ CHP transparent</div> <p class="fclaim">Connected in read-only mode · local calculation · no cloud. The installation remains with you.</p> <nav class="flinks"><a href="/glaesern/">All trades</a> <a href="/glaesern/cogeneration/abgas.html">Exhaust gas & Emission</a> <a href="https://bhkw-anlagen.com/impressum.html">Legal notice</a> <a href="https://bhkw-anlagen.com/datenschutz.html">Data protection</a></nav> <div class="fcopy">© 2026 HR Energiemanagement GmbH · 32257 Bünde · +49 5223 4921030</div> </div></footer> <script> var state={step:1}; function li(t){return '<li>'+t+'</li>';} function nav(s){var b=s>1?'<button class="wiz-back" onclick="go('+(s-1)+')">← Back</button>':'<span></span>'; var n=s<4?'<button class="wiz-next" onclick="go('+(s+1)+')">Next →</button>':'<button class="wiz-next" onclick="go(1)">From the beginning</button>'; return '<div class="wiz-nav">'+b+n+'</div>';} function step1(){return '<div class="step-grid"><img class="step-img" src="../img/frage_lang_en.jpg">'+ '<div class="step-grid"><div><p class="step-kicker">Step 1 · Understanding</p>'+ '<h3 class="step-h">What is "When must NOx be monitored continuously?"</h3>'+nav(1);} function step2(){return '<p class="step-p">Above a certain combustion power, the BImSchG requires continuous emission monitoring; NOx limit for biogas gas engines: 650 mg/m³ — exceedances must be reported and can lead to operating restrictions.</p>'+nav(2);} function step3(){return '<p class="step-kicker">Step 2 · Live view</p><h3 class="step-h">The plant — right now</h3><div class="live-head"><span class="livedot"></span><span class="live-status" id="lstatus"> connecting... </span><span class="live-sub">· anonymous reference plant · read-only from the process control system, calculated in-house</span></div><div class="kpis"><div class="kpi" data-k="sbhkw2_rabgastemp_zyl01"><div class="kl">Exhaust Cyl 1</div><div class="kval"><span class="v">…</span><span class="ku">°C</span></div><div class="spark"></div></div><div class="kpi" data-k="sbhkw2_rtemp_vkat"><div class="kl">Before Cat</div><div class="kval"><span class="v">…</span><span class="ku">°C</span></div><div class="spark"></div></div><div class="kpi hl" data-k="sbhkw2_rtemp_nkat"><div class="kl">After Cat</div><div class="kval"><span class="v">…</span><span class="ku">°C</span></div><div class="spark"></div></div><div class="kpi" data-k="sbhkw2_ransaugtemp"><div class="kl">Intake air</div><div class="kval"><span class="v">…</span><span class="ku">°C</span></div><div class="spark"></div></div>'+ '<p class="step-p" style="margin-top:1rem">Excerpt from <b id="lcount">…</b> measurement values of the plant. For the detailed <a href="https://bhkw-anlagen.com/erklaervideo/frage_nox_grenzwert_ueberwachen.html" style="color:var(--accent)">explanation page with video →</a></p>'+li('<div class="step-grid"><div><p class="step-kicker">Step 3 · What the AI does</p>')+li('<h3 class="step-h">What the AI reads from these values</h3><ul class="chk">')+li('Current NOx value relative to the limit of 650 mg/m³')+li('Trend analysis for the <b>detection of catalyst degradation</b>')+'</ul></div>'+ 'Comparison of actual values with the target value of the control algorithm'+ 'Early warning in case of <b>instabilities in the combustion process</b>'+ '<img class="step-img" src="../img/ki-abgas.jpg" alt="AI monitors">'+ '<div class="szen szen-grid"><img class="szen-img" src="../img/szen-abgas.jpg" alt="Scenario" loading="lazy"><div><p class="mon">Monitoring: continuous · Emission relative to the limit</p>'+nav(3);} function step4(){return '<p class="step-p"><b>The scenario:</b> an emission value rises slowly, it is only detected during the official measurement, in the worst case, a restriction of operation.<br>'+ '<b>The AI:</b> detects the trend towards the limit early and reports the need for action before the measurement occurs. <b>It identifies the trend before the limit is exceeded.</b></p></div></div>'+ '<p class="step-kicker">Step 4 · Your benefit</p><h3 class="step-h">Why it\'s important</h3>'+ '<div class="benefit"><h3>Continuous monitoring prevents fines and shutdowns due to limit exceedances.</h3><p>Precise NOx monitoring enables proactive maintenance of the exhaust gas treatment. 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