FTIR Multi-Component Gas Analyzers — Simultaneous Measurement of Up to 12 Gases
One FTIR analyzer · 12 gases simultaneously · ppb-class sensitivity · mathematical deconvolution
Fourier Transform Infrared (FTIR) gas analyzers measure up to 12 gas components simultaneously from a single sample — ideal for complex CEMS, waste incineration EU BAT 50 compliance (HCl / HF / NH₃ / N₂O), semiconductor process, and ethylene cracker streams where single-gas analyzers would require four or more instruments.
Why FTIR for Multi-Component Industrial Gas Analysis
Five reasons process engineers, CEMS integrators, and incineration plants pick an FTIR gas analyzer over a stack of single-gas instruments.
12 Gases Simultaneously
A single FTIR cell measures up to 12 IR-active components in one acquisition cycle — CO, CO₂, NO, NO₂, N₂O, SO₂, HCl, HF, NH₃, H₂O plus two custom channels.
Replaces 3–5 single-gas analyzers, shrinks the analyzer shelter footprint, and removes 3–5 separate calibration schedules.
ppb-Class Sensitivity
Long-path sample cell + multivariate calibration deliver gas-dependent limits of detection down to the ppb range; confirmed per channel at RFQ against your permit limit.
Margin against EU BAT 50 (HCl 6 mg/Nm³, HF 1 mg/Nm³) and US MACT incinerator limits without needing a second instrument.
No Cross-Interference
PLS / CLS deconvolution uses the full IR fingerprint of each gas, so overlapping bands (H₂O vs HCl, NO vs CO, NH₃ vs H₂O) are resolved mathematically — not by hardware filters.
Reliable HCl, HF, NH₃ readings in hot wet flue without false-high alarms or drift correction loops.
One Calibration, Many Gases
A factory PLS / CLS calibration covers every gas in the channel list. Annual zero-gas verification plus a span check on critical components is the routine plant workflow.
Fewer span gas cylinders, shorter calibration windows, and a smaller QAL3 maintenance footprint than a multi-instrument stack.
Future-Proof for New Pollutants
When a new regulated gas appears — N₂O, NH₃, a new HAP — the full IR spectrum is already recorded. Adding the channel is a calibration update, not new hardware.
Hedges against the next 5–10 years of regulation (EU IED revision, MACT updates) without a CapEx project per pollutant.
How FTIR Works: Michelson Interferometer & Multivariate Calibration
From broadband IR source to deconvolved gas concentration — four physical stages, no moving optical filters.
Fourier Transform Infrared (FTIR) spectroscopy modulates a broadband IR source through a Michelson interferometer and recovers the full IR spectrum from the resulting interferogram — so one acquisition captures every IR-active gas simultaneously, not one band at a time.
A Michelson interferometer modulates a broadband IR source across all wavelengths simultaneously. The resulting interferogram is Fourier-transformed into a full IR spectrum (typically 4000–400 cm⁻¹ at 1 cm⁻¹ resolution). Each gas absorbs at characteristic wavenumbers; multivariate calibration (PLS / CLS) deconvolves overlapping bands into individual concentrations.
GS8600-MG runs this measurement at 1 cm⁻¹ resolution across 4000–400 cm⁻¹ — fine enough to separate HCl from H₂O and NH₃ from H₂O, the two hardest deconvolutions in wet flue gas. The same hardware handles waste-incineration EU BAT 50 channels and ethylene-cracker C₂H₄ trace without optical reconfiguration.
FTIR Measurement Pipeline
Measurable Gases & Concentration Ranges (12 Gases, Simultaneous)
A typical CEMS calibration package on GS8600-MG — exact channel list confirmed at RFQ against your permit and process gases.
| Gas | Typical Range | Application |
|---|---|---|
| CO | 0–500 ppm | Combustion efficiency, CEMS |
| CO₂ | 0–20 vol% | Combustion / process |
| NO | 0–500 ppm | NOₓ CEMS |
| NO₂ | 0–200 ppm | NOₓ speciation |
| N₂O | 0–100 ppm | Waste incineration / nitric acid |
| SO₂ | 0–500 ppm | SOₓ CEMS, FGD outlet |
| HCl | 0–50 ppm | Waste incineration EU BAT 50 |
| HF | 0–10 ppm | Aluminium / cement / incineration |
| NH₃ | 0–100 ppm | SCR ammonia slip |
| H₂O | 0–40 vol% | Wet-basis correction |
| CH₄ | 0–500 ppm | Greenhouse gas monitoring |
| C₂H₄ | 0–500 ppm | Ethylene cracker |
Ranges are typical CEMS configurations; per-channel ranges and detection limits are confirmed during RFQ.
FTIR vs NDIR vs UV-DOAS: When to Choose FTIR
Pick the right spectroscopy for your gas matrix. FTIR is the answer when you need four or more gases from a single sample; for two well-defined IR or UV gases, simpler technologies win on CapEx.
| Dimension | FTIR | NDIR | UV-DOAS | Single-gas (EC / paramagnetic / TDLAS / CLD) |
|---|---|---|---|---|
| Principle | Broadband IR + interferometer + multivariate calibration | Single-band IR with optical filter | Differential UV absorption spectroscopy | Per-gas dedicated cell or sensor |
| Range | ppb–vol%, gas-dependent | ppm–vol% | ppb–ppm for UV-active species | Optimised per gas |
| Accuracy | Application-dependent, confirmed at RFQ | ±1–2% FS typical | ±2% FS typical | Best-in-class for that one gas |
| Response Time | ~10–60 s (depends on flow & cell volume) | < 30 s | < 10 s | Sensor-dependent |
| Best For | Multi-component streams (≥ 4 gases), low-ppm pollutants, EU BAT 50 HCl / HF / NH₃ | One or two well-defined IR-active gases (CO, CO₂, CH₄) | SO₂, NO, NO₂, H₂S, Cl₂ — UV-active species | One critical gas with high accuracy demand |
| Limitations | Higher CapEx than single-gas; trained operator preferred | One filter per gas — scales poorly for 4+ components | No coverage of IR-only species (CO, CO₂, CH₄, HF) | Four instruments + four sample lines + four calibrations for four gases |
Choose FTIR When…
- Four or more gases must come from one simultaneous measurement
- EU BAT 50 / EU IED waste-incineration HCl / HF / NH₃ / N₂O speciation is in scope
- Future-proofing for the next regulated pollutant matters
- Multivariate deconvolution is needed in a wet, mixed flue matrix
- GS8600-MG operating envelope matches your stack temperature and dust loading
Consider NDIR or Single-Gas When…
- Only one or two IR-active gases (CO, CO₂, CH₄) are in scope
- CapEx-constrained boiler with no near-term regulation change
- SO₂ / NO / NO₂ in dry stack — UV-DOAS is often cheaper per channel
- A single critical gas needs the best-in-class LOD (CLD for NO, paramagnetic for O₂)
- See NDIR Gas Analyzers or UV-DOAS Gas Analyzers.
GS8600-MG Multi-Component FTIR Analyzer
The GESHINE FTIR anchor SKU — 12 simultaneous channels, 1 cm⁻¹ resolution, heated sample cell sized for hot wet flue.
Multi-Component FTIR Gas Analyzer
GS8600-MG is the GESHINE multi-component FTIR analyzer engineered for CEMS shelters, waste incineration EU BAT 50 compliance (HCl / HF / NH₃ / N₂O), and process streams where a single FTIR replaces four or more single-gas instruments.
- Boiler stack multi-pollutant CEMS (CO / NOₓ / SO₂ / HCl / NH₃)
- Waste incineration EU BAT 50 — HCl 6 mg/Nm³, HF 1 mg/Nm³
- Ethylene cracker mixed hydrocarbon streams
- Cement / lime kiln NH₃ slip with multi-pollutant roll-up
Where GS8600-MG Lives
GS8600-MG sits in the GESHINE Multi-Gas Analyzers family. This FTIR page explains when to pick FTIR technology and points to the multi-gas listing for the full specification rather than duplicating the spec sheet here.
Where FTIR Gas Analyzers Earn Their Keep
Six industries where a multi-component FTIR replaces a stack of single-gas instruments — and where GESHINE has plant-side commissioning experience.
CEMS / Power
Boiler stack multi-pollutant CEMS
Waste Incineration
EU BAT 50 HCl / HF / NH₃ / N₂O compliance
Semiconductor
Process gas monitoring & abatement outlet
Petrochemical
Ethylene cracker, mixed hydrocarbon streams
Research / Pilot
Catalyst evaluation, combustion R&D
Cement & Lime
Kiln stack multi-pollutant + NH₃ slip
FTIR Gas Analyzer FAQ
Questions process engineers and CEMS integrators ask before they commit to an FTIR channel — answered straight.
How many gases can one FTIR analyzer measure at the same time?
GS8600-MG measures up to 12 gas components simultaneously from a single sample cell. The exact list depends on the calibration package you order (a typical CEMS package: CO, CO₂, NO, NO₂, N₂O, SO₂, HCl, HF, NH₃, H₂O plus two custom). Adding a 13th gas later only needs a new calibration, not new hardware.
Is FTIR overkill for our boiler — we only need CO and NOₓ?
For two well-defined gases, NDIR + chemiluminescence (or electrochemical) is usually more cost-effective. FTIR pays back when you need ≥ 4 gases, or when regulation (EU BAT 50, US MACT) is likely to add HCl / HF / NH₃ in the next 5 years — recalibration beats buying a second instrument.
How does FTIR avoid cross-interference between overlapping IR bands?
Multivariate calibration (PLS / CLS) uses the full spectral fingerprint of each gas rather than a single peak. Overlap between H₂O and HCl, or NO and CO, is resolved mathematically against pre-recorded reference spectra at the same temperature and pressure as the sample.
Do you offer portable FTIR for plant survey work?
No. GESHINE focuses on fixed industrial FTIR (GS8600-MG) for CEMS and process streams. For portable handheld survey we recommend purpose-built portable FTIR suppliers; we do not currently sell that form factor.
What sample conditioning does FTIR need?
For hot, wet, dust-laden flue, a heated sample line (typically 180 °C) and heated filter keep H₂O, HCl, HF, and NH₃ in the gas phase all the way to the FTIR cell. Pair GS8600-MG with a GS-SCS sampling system sized to your stack temperature.
What spectral resolution does GS8600-MG run at?
GS8600-MG operates at 1 cm⁻¹ resolution across 4000–400 cm⁻¹. This is fine enough to separate HCl from H₂O and NH₃ from H₂O — the two hardest deconvolutions in wet flue gas.
How long does an FTIR calibration last in service?
Factory PLS / CLS calibrations are stable for years when the cell, source, and detector are not contaminated. Plant practice is annual zero-gas verification plus span check against certified gas where critical components are present; we size that into commissioning at RFQ.
Can FTIR replace our existing NOₓ chemiluminescence (CLD) analyser?
Functionally yes for many CEMS duties — FTIR reads NO + NO₂ + N₂O directly without a converter. But CLD often has lower LOD for ppb-class NO. We help benchmark FTIR vs CLD against your permit limit during RFQ.
Request a Quote for an FTIR Gas Analyzer
To size a GS8600-MG multi-component FTIR for your duty, please have these details ready:
- Target gas list & expected concentration range per channel
- Stack / process temperature, pressure & dust loading
- Wet vs dry sample path (heated line vs cooled-dry)
- Permit limits & regulatory framework (EU BAT 50 / EPA MACT / GB)
- Existing analyzer stack to replace or augment
- Hazardous area classification (ATEX zone) if applicable
- Output protocols (4–20 mA, Modbus, OPC UA)
- CEMS shelter, sample probe, and span gas constraints
Get FTIR Application Engineering
GESHINE FTIR application engineers size GS8600-MG against your permit, your stack, and your existing analyzer fleet — not from a generic datasheet.