01
System diagram — hover or click any component
Sampling & measurement
DURAG in-situ / flow
AP2E LaserCEM® multigas
Process Insights · Extrel MGA
Mercury CEMS
Systems integration
Heated sample line
— — — Heated sample line
02
Analyzer technology — benefits, use cases & regulatory fit
CAI / ENVEA
Extractive CEMS analyzers
NDIR · FID · Chemiluminescence · Paramagnetic · FTIR
Key benefits
- Field-established technology with a long history of EPA Performance Specification certifications
- Dedicated analyzer per gas — designed for independent measurement of each gas component
- FID available for THC/VOC applications where laser-based methods may not be applicable
- Available with a broad range of EPA Performance Specification certifications — confirm applicability with manufacturer
- Cost-effective option for standard SO₂/NOₓ/CO/O₂ monitoring applications
Best use cases
Coal & gas power plantsIndustrial boilersRefineriesStandard SO₂/NOₓ compliance
Regulatory standards
40 CFR Part 7540 CFR Part 60EPA PS-2 (SO₂/NOₓ)EPA PS-3 (O₂/CO₂)EPA PS-4 (CO)
AP2E — DURAG Group
LaserCEM® multigas analyzer
OFCEAS laser · Low Pressure Sampling (LPS®)
Key benefits
- One analyzer measures 10+ gases: SO₂, NOₓ, CO, CO₂, O₂, HCl, HF, NH₃, N₂O, H₂S, H₂O and more
- Manufacturer-stated: no daily calibration gas required — OFCEAS laser design minimizes zero/span drift
- Designed for high-moisture stacks (>80% H₂O) without sample drying per manufacturer specifications
- Available in low certified measurement ranges for HF, NO, CO — applicable to sources with stringent emission limits
- QAL1 type-approved by TÜV and MCERTS to EN 15267 per manufacturer documentation
Best use cases
Waste-to-energy / incinerationCement & lime kilnsHCl / HF trace complianceHigh-moisture stacks
Regulatory standards
40 CFR Part 60EPA PS-18 (HCl)MATS (HCl)EN 15267 QAL1MCERTS
DURAG Group
In-situ opacity, flow & combustion
Cross-stack optical · Ultrasonic flow · Flame scanners
Key benefits
- Direct in-situ measurement — no sample extraction, probe, or heated line needed
- Applicable to sources requiring real-time PM/opacity monitoring as an alternative to periodic stack testing
- Ultrasonic stack flow: no moving parts or pressure taps per manufacturer design
- Flame scanners: UV and IR detection for burner control applications
- Continuous bag leak detection — designed to identify filter failures early
Best use cases
Power plantsCement & lime kilnsBaghouse monitoringFlow for mass emission rate
Regulatory standards
EPA Method 9 (opacity)EPA PS-140 CFR Part 60 (PM)EPA Method 2 (flow)
DURAG Group
Mercury (Hg) CEMS
Atomic fluorescence · Atomic absorption · Sorbent trap
Key benefits
- Designed for continuous Hg monitoring in applications subject to MATS 30-day rolling average requirements
- Elemental (Hg⁰) and oxidized (Hg²⁺) mercury speciation available
- Sub-µg/Nm³ detection limits — applicable to sources with stringent Hg emission limits
- Sorbent trap option available for applications requiring Method 30B-compatible monitoring
- Compatible with DAHS platforms for automated data acquisition and regulatory reporting support
Best use cases
Coal-fired power plantsWaste incinerationNon-ferrous smeltersChlor-alkali plants
Regulatory standards
MATS (40 CFR 63 Sub. UUUUU)EPA PS-12AEPA Method 30BMinamata Convention
Contech
Analyzer systems integration
Turnkey EPC · DCS/PLC/SIS · DAHS · Field service
Key benefits
- Single-source supplier capability from concept through commissioning
- Custom analyzer shelters: climate-controlled, NEMA-rated for harsh environments
- DCS, PLC, SIS, and HMI integration — any platform, any protocol
- DAHS platforms for automated data acquisition supporting regulatory reporting workflows
- Ongoing field service, calibration, and RATA QA/QC support post-startup
Best use cases
New CEMS installationsAnalyzer shelter buildsLegacy system upgradesOngoing O&M contracts
Regulatory standards
40 CFR Part 75 DAHSEPA QA/QC (RATA)NFPA 70 / NECISA-18.2
Universal Analyzers
Gas sampling & conditioning
Extractive probes · HSL · Gas coolers · Conditioners
Key benefits
- Designed for a range of stack conditions — wet, dirty, and high-temperature applications
- Heated sample lines designed to maintain gas above dew point to help prevent analyte loss
- Dilution probe options available for high-moisture or corrosive gas stream applications
- Gas coolers and conditioners prepare sample for downstream analyzers
- First step in any extractive system — sample handling quality directly affects downstream measurement accuracy
Best use cases
All extractive CEMSHigh-moisture stacksCorrosive gas streamsFlare gas sampling
Regulatory standards
EPA PS-2 / PS-4 sampling40 CFR Part 60 App. BEPA Method 1/2 traverse
03
CEMS markets & applicable regulations — Upper Midwest territory
Click any market to expand regulations, measured gases, and ISS equipment fit.
Power Generation
Coal, natural gas CCGT, simple cycle peakers, rural electric co-ops
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Key regulations
| 40 CFR Part 75 | Requires continuous SO₂, NOₓ, CO₂, flow, and opacity monitoring with DAHS and quarterly RATA for coal/gas EGUs |
| CSAPR / Update | Establishes NOₓ and SO₂ allowance budgets; Part 75 CEMS applicable to sources subject to cap-and-trade requirements in MN, ND, SD, WI, IA |
| MATS (Sub. UUUUU) | Continuous Hg, HCl, PM; 30-day rolling averages — coal fleet only |
| EPA Method 19 | F-factor methodology for heat input and stack gas flow; applicable to turbine installations where Method 2 traverse is impractical |
| Part 60 Sub. TTTT | New steam EGUs post-2015; SO₂, NOₓ, CO, opacity performance specs |
Measured gases
ISS equipment fit
Part 75 is among the most comprehensive monitoring frameworks — flow, SO₂, NOₓ, CO₂, opacity, and DAHS all mandated simultaneously. ISS can support the full monitoring equipment scope from a single rep — analyzers, shelter, integration, and DAHS.
Industrial Boilers & RDF / Waste-to-Energy
Coal, biomass, RDF, multi-fuel industrial and institutional boilers
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Key regulations
| Boiler MACT (Sub. DDDDD) | Applicable to major source industrial boilers not subject to Part 75; includes CO monitoring, periodic PM/HCl/Hg testing, and opacity requirements |
| Part 60 Sub. Eb | MSW/RDF incinerators: SO₂, NOₓ, CO, HCl, opacity, Hg, dioxins CEMS |
| Part 63 Sub. EEE | Hazardous waste combustors / WTE: broadest gas suite required of any source type |
| 40 CFR Part 64 (CAM) | Applicable to major sources not subject to Part 75; establishes indicator monitoring requirements for opacity, SO₂, and NOₓ |
Measured gases
ISS equipment fit
AP2E LaserCEM® is well-suited for this market — designed to measure 10+ gases including HCl, HF, and Hg, and rated for high-moisture RDF stacks without sample drying per manufacturer specifications. Potentially reduces ongoing O&M cost compared to multiple dedicated single-gas analyzers.
Ethanol Production
Corn ethanol plants, regenerative thermal oxidizers (RTOs), fermentation CO₂
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Key regulations
| Part 63 Sub. BBBBBB | Applicable to ethanol production facilities — addresses VOC/HAP from fermentation, distillation, and storage; CO monitoring at thermal oxidizers |
| 40 CFR Part 60 (NSPS) | Boiler subparts for process steam generation at larger facilities |
| 40 CFR Part 64 (CAM) | Compliance Assurance Monitoring for major source permit requirements |
Measured gases
ISS equipment fit
CO monitoring on regenerative thermal oxidizers (RTOs) is a common monitoring requirement at ethanol facilities. CAI FID analyzers are applicable to VOC/HAP monitoring at the concentration ranges typical of RTO exhaust. Typically straightforward installations with ongoing service and calibration requirements.
Fertilizer & Ammonia Production
Anhydrous ammonia, urea, nitric acid, sulfuric acid plants
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Key regulations
| Part 60 Sub. GG | Nitric acid plants — NOₓ CEMS required |
| Part 63 Sub. FFFF | Miscellaneous organic chemical manufacturing — HAP monitoring |
| Part 60 Sub. H | Sulfuric acid plants — continuous SO₂ CEMS, opacity monitoring |
Measured gases
ISS equipment fit
AP2E LaserCEM® is designed for direct laser NH₃ measurement at ppb-level sensitivity per manufacturer specifications — no extractive sample conditioning required. Laser-based measurement is designed to minimize the NH₃ adsorption concerns associated with conventional extractive sample lines.
Pulp & Paper Mills
Kraft recovery boilers, lime kilns, power boilers, smelt dissolving tanks
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Key regulations
| Part 63 Sub. S | Pulp/Paper MACT — TRS monitoring from recovery boilers, lime kilns, smelt tanks |
| Part 60 Sub. BB | Kraft pulp mills — SO₂, opacity from recovery boilers |
| Boiler MACT (Sub. DDDDD) | CO CEMS for power boilers; periodic HCl and Hg testing |
| 40 CFR Part 64 (CAM) | Compliance monitoring plans for multiple source types across the facility |
Measured gases
ISS equipment fit
TRS (total reduced sulfur) monitoring involves detection of H₂S, methyl mercaptan, dimethyl sulfide, and dimethyl disulfide at low ppm levels — confirm instrument capability with manufacturer for specific permit requirements. Multi-source facilities may be served by a single integrated monitoring system — Contech offers multi-point shelter and DAHS integration across source types.
Natural Gas Processing & Transmission
ND Bakken processing, pipeline compressor stations, gathering systems
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Key regulations
| Part 60 Sub. OOOO/OOOOa | Applicable to oil and gas facilities; addresses VOC/methane emissions from compressor engines, dehydrators, and storage vessels requirements |
| RICE NESHAP (Sub. ZZZZ) | CO catalyst monitoring on compressor engines; hours-based maintenance triggers |
| Part 60 Sub. KKK/LLL | Equipment leaks and fugitive emissions at gas processing plants |
Measured gases
ISS equipment fit
Process Insights Extrel MGA is designed for real-time multicomponent gas analysis — BTU, Wobbe index, and component breakdown — in a single continuous analyzer. Continuous measurement reduces the lag time associated with periodic gas chromatograph sampling in combustion control and custody transfer applications.
Mining & Minerals Processing
Taconite iron ore, aggregate, potash/phosphate processing
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Key regulations
| Part 63 Sub. RRRRR | Taconite MACT — Applicable to taconite processing operations; addresses PM, opacity, and CO monitoring at pelletizing furnaces and kilns |
| Part 60 Sub. H | Sulfuric acid plants — SO₂ CEMS, opacity; applies to potash/phosphate processing in ND |
| 40 CFR Part 64 (CAM) | Compliance monitoring plans; opacity and CO indicator monitoring at major source kilns |
Measured gases
ISS equipment fit
Pelletizing furnace and kiln opacity monitoring is the primary CEMS requirement for taconite processing. Remote site locations and harsh operating environments are well-suited to weatherized analyzer shelter solutions. SO₂ monitoring at sulfuric acid units may also apply depending on facility configuration.
Data Centers & Behind-the-Meter Generation
Hyperscale campuses, emergency generators, battery backup systems
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Key regulations
| RICE NESHAP (Sub. ZZZZ) | CO catalyst monitoring on diesel/gas emergency generators; hours-based maintenance triggers |
| Part 60 Sub. IIII/JJJJ | Stationary CI and SI engines — NOₓ, CO emission standards and monitoring for standby generators |
| State air permits | MN, WI, IA state permits often require monitoring beyond federal minimums for large campus generator fleets |
Measured gases
ISS equipment fit
Large campus generator fleets may be subject to RICE NESHAP and state air permit monitoring requirements — confirm with permitting authority. Sensidyne gas detection for hydrogen (battery rooms) and ammonia (cooling systems) addresses safety monitoring requirements that typically arise early in facility development. Integrated monitoring systems may support both safety and air permit monitoring objectives.