ICAD NO₂–NOx–NO Analyzer Series 210
The ICAD Series 210 provides precise and fast in‑situ measurements of NO and NO₂ using patented Iterative Cavity DOAS spectroscopy. It directly detects NO₂ — without converter artefacts and without humidity interferences — and operates without the need for NO₂ calibration gas.
ICAD instruments offer very low noise, negligible zero drift and a wide dynamic range. This makes them suitable for both highly polluted roadside environments and ultra‑clean background locations. Thanks to low power demand and robust housings, ICAD systems can be used in stationary installations, industrial stacks, mobile vehicle platforms, ships and UAV‑based deployments.
Models equipped with integrated CO₂ sensors (DE versions) support real‑time plume chasing and NOx emission‑factor calculations for on‑road and off‑road applications.
Operation Principle
The ICAD analyzer uses a closed‑path optical resonator to achieve very long effective absorption paths. This enables highly sensitive detection of NO₂ based on its characteristic absorption features in the 430–480 nm wavelength range.
NO is measured via an internal ozone‑based, NOx‑free converter that converts NO to NO₂. Two parallel measurement cells — one for direct NO₂ and one for NO after conversion — ensure precise and drift‑free NO, NO₂ and total NOx quantification. The method is insensitive to humidity and requires no sample drying.
Document Downloads
All key ICAD documents grouped by category for quick access.
Product Overview
Application Notes
Additional Information
Key Applications & Advantages
Air‑quality monitoring
Provides accurate NO₂ and NOx data for roadside stations, urban background locations and long‑term environmental monitoring.
Industrial emission control
Measures NOx from engines, combustion systems and industrial stacks without converter drift or cross‑sensitivities.
Mobile field measurements
Fast 1–3 s response enables vehicle plume chasing, ship‑emission studies and flexible outdoor deployment.
Background & research studies
L and DL versions achieve ppt‑level sensitivity for atmospheric chemistry and clean‑air measurements.
Calibration‑free operation
No NO₂ calibration gas required thanks to spectroscopic reference data and automatic zero checks.
Robust optical design
Temperature‑stabilised, vibration‑resistant optics ensure stable operation — no drying of sample air needed.
Mobile & rugged housings
IP64 M‑versions support outdoor use, vehicle installations and ship‑based measurements.
Emission‑factor analysis
DE models include CO₂ measurement for on‑road plume chasing and NOx emission‑factor calculation.
ICAD Model Comparison
| Model | Detected species | Typical detection limit | Main features |
|---|---|---|---|
| ICAD‑NO₂‑210 | NO₂ | ~0.09 ppb @ 60 s | Direct NO₂ monitoring for air‑quality stations and industrial applications. |
| ICAD‑NOx‑210D | NO + NO₂ → NOx | ~0.09 ppb @ 60 s (NO₂) | Dual‑cell NOx analyzer with internal ozone converter for NO to NO₂ conversion. |
| ICAD‑NOx‑210DE | NO + NO₂ + CO₂ | ~0.09 ppb @ 60 s (NO₂) | Same as 210D, plus CO₂ measurement for emission‑factor and plume‑chasing studies. |
| ICAD‑NO₂‑210L | NO₂ | 15–50 ppt | High‑grade NO₂ analyzer for research and low‑background applications. |
| ICAD‑NOx‑210DL | NO + NO₂ → NOx | 20–50 ppt (NO₂) | Highest‑precision NOx analyzer with ultra‑low detection limits. |
| ICAD‑NOx‑210DM / DE‑M | NO + NO₂ (+ CO₂, depending on model) | Equal to corresponding base model | Mobile IP64 housing for field, vehicle and outdoor use. |
Housing Configurations
The ICAD Series 210 is available in several housing variants to support laboratory setups, stationary monitoring and mobile field applications.
|
 |
 |
| 19″ Rack Housing
Suitable for laboratory setups and stationary long‑term monitoring. |
Mobile Outdoor Housing
Robust, weather‑resistant enclosure for extended outdoor field campaigns. |
Custom Housing Options
Tailored mechanical designs for specialized scientific or industrial requirements. |
Frequently Asked Questions
How does the ICAD analyzer detect NO₂?
ICAD measures NO₂ directly using cavity‑enhanced spectroscopy in the 430–480 nm region. This avoids converter artefacts and humidity interferences.
How is NO measured?
NO is converted to NO₂ using an internal ozone‑based, NOx‑free converter. Parallel cells measure direct NO₂ and converted NO for accurate NOx.
Does the ICAD analyzer require calibration gas?
No. ICAD uses spectroscopic reference data and automatic zero checks. Only the optional NO converter may require a periodic functional check.
What are the typical detection limits?
Standard models reach sub‑ppb sensitivity. L and DL versions achieve ppt‑level precision for background and research work.
Is the instrument affected by humidity or temperature changes?
No. ICAD is insensitive to water vapour and uses temperature‑stabilised optics for long‑term stability.
Can ICAD be used for mobile measurements?
Yes. IP64 M‑versions are designed for vehicle, ship and UAV‑based field deployments.
Which ICAD model is best for my application?
NO₂‑210 for NO₂ only, NOx‑210D for standard NOx, NOx‑210DE for NOx+CO₂ emission studies, and L/DL versions for high‑sensitivity research applications.
ICAD Model Recommendation Matrix
Quick visual guide to help identify the most suitable ICAD 210 model for your measurement needs.
| Model | Direct NO₂ | NOx (NO+NO₂) | CO₂ | High Sensitivity (ppt‑level) |
Mobile / IP64 | Typical Application |
|---|---|---|---|---|---|---|
| ICAD‑NO₂‑210 | ✔ | – | – | – | – | Standard NO₂ monitoring (air quality, industry) |
| ICAD‑NOx‑210D | ✔ | ✔ | – | – | – | General NOx measurement (stationary & mobile) |
| ICAD‑NOx‑210DE | ✔ | ✔ | ✔ | – | – | Plume chasing, emission factors, vehicle studies |
| ICAD‑NO₂‑210L | ✔ | – | – | ✔ | – | Research-grade NO₂ for background/ppt levels |
| ICAD‑NOx‑210DL | ✔ | ✔ | – | ✔ | – | High-precision NOx research, test benches |
| M‑Versions (DM / DE‑M) | ✔ | ✔ | depending on model |
same as base model |
✔ | Mobile/IP64 field use, vehicles, ships, outdoor |
Need help selecting the best model?
Contact our team — we’re happy to advise.
Get in Touch with Airyx
Find your local Airyx distributor or contact our Heidelberg team directly. Moreover, we support you with product questions, technical assistance and partnership inquiries.
Contact Airyx Headquarters
Airyx GmbH is based in Heidelberg, Germany. In addition, our team supports customers worldwide in environmental monitoring, wastewater emissions and air‑quality research.
Furthermore, we provide fast technical assistance and reliable guidance for instrument selection.
How to Reach Our Team
Email: info@airyx.de
Phone: +49 6221 9068977
Address:
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69123 Heidelberg, Germany
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Regional Expertise for DOAS and Gas‑Analysis Systems
Select your region below to find the appropriate Airyx distributor. As a result, you benefit from local expertise and shorter response times.
Europe
Europe
France
MEGATEC SAS
Saint-Aubin, France
Website: https://www.megatec.fr/
Contact: https://www.megatec.fr/contact
Contact person: Fabrice Losbar
Czech Republic, Slovakia & Lithuania
ENVItech Bohemia s.r.o.
Prague, Czech Republic
Website: https://www.envitech-bohemia.cz/
Contact: https://www.envitech-bohemia.cz/en/kontakt
Spain & Portugal
Green Light Research SLU
Madrid, Spain
Website: https://www.greenlightresearch.net/
Contact: https://www.greenlightresearch.net/contacto/
Italy
Luchsinger SRL
Curno, Italy
Website: https://www.luchsinger.it/
Contact: https://www.luchsinger.it/it/contatti/
Netherlands, Belgium, Luxembourg, Nordics
The Dutch Scientist
's‑Hertogenbosch, NL
Website: https://www.thedutchscientist.com/
Contact: https://www.thedutchscientist.com/CONTACT/
Finland
HNU Nordion
Helsinki, Finland
Website: https://hnunordion.fi/
Contact: https://hnunordion.fi/yhteystiedot/
Greece
Polaris Environment Ltd
Athens, Greece
Website: http://www.polaris-environment.gr/
Romania (ICAD only)
APEL LASER
Mogosoaia, Romania
Website: https://www.apellaser.ro/
Romania (Open Path, SkySpec, WGA)
PHANOS
Bucharest, Romania
Website: https://phanossci.com/
Bulgaria & Western Balkans
STABO‑Tech Ltd.
Stara Zagora, Bulgaria
Website: http://stabo-tech.eu/
Asia
Asia
India
M&G Analyzer Systems
Pune, India
Website: https://www.mganalyser.com/
Vietnam
Reeco Science & Technology Co.
Ho Chi Minh City, Vietnam
Website: https://reecotech.com.vn/
Indonesia
PT JJExotranoz Inter Vania
Cibubur, Indonesia
Contact: Jefry KP
China
Li‑Ca Scientific
Website: http://en.li-ca.com/
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We also provide local support in Hong Kong, Macau and Taiwan through additional regional partners.
Global Distributor Network
Airyx works with a selected network of regional distributors who provide local expertise in air‑quality monitoring, DOAS‑based systems, wastewater gas analysis and real‑world emissions measurement.
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