How does the ICAD‑HONO analyzer detect HONO and NO2?

The ICAD‑HONO/NO2‑210L uses high‑resolution ICAD spectroscopy between 350–390 nm. It detects HONO and NO2 directly without converters, chemicals or sample drying.

Does the ICAD‑HONO analyzer require calibration gas?

No calibration gas for HONO or NO2 is required. Concentrations are derived from molecular absorption cross-sections, combined with automatic zero measurements.

What are the typical detection limits of the ICAD‑HONO/NO2‑210L?

The detection limits (2σ at 60 s) are 0.08 ppb for HONO and 0.16 ppb for NO2.

Is the ICAD‑HONO system affected by humidity or temperature?

No significant humidity or temperature sensitivity. The optical system is temperature-stabilised and insensitive to vibrations.

Can the ICAD‑HONO analyzer be used for mobile measurements?

Yes. The mobile IP67 version supports car, ship and UAV deployments with low power consumption and fast response times.

ICAD-HONO/NO2-210L In‑Situ Monitor

Name: Airyx ICAD‑HONO/NO₂‑210L Analyzer
Brand: Airyx
SKU: ICAD-HONO-210L

The ICAD‑HONO/NO₂‑210L provides fast, direct and calibration‑free measurements of nitrous acid (HONO) and nitrogen dioxide (NO₂) using high‑resolution Iterative Cavity DOAS spectroscopy. The method quantifies both gases purely spectroscopically, without converters, reagent gases or external calibration standards.

The long effective absorption paths of the optical resonator enable sub‑ppb detection limits with 1‑second time resolution. Because the measurement is fully optical, the system shows no significant cross‑sensitivities, no humidity‑related artefacts and requires no sample drying. Integrated zero checks and temperature‑stabilised optics ensure long‑term stability with minimal maintenance effort.

With low power consumption and a compact 19″ rack design, the analyzer is suited for laboratory studies, stationary air‑quality monitoring and mobile field campaigns on vehicles or ships. A browser‑based graphical interface provides full access to data, system diagnostics and configuration via Wi‑Fi or LAN.

Operation Principle

The analyzer uses a closed‑path optical resonator that provides effective absorption paths up to 3 km. HONO and NO₂ concentrations are derived from Iterative Cavity DOAS (ICAD) spectroscopy in the 350–390 nm wavelength range.

The measurement is fully spectroscopic and direct. No converters, reagent gases or sample drying are required. Automatic zero checks and temperature‑stabilised optics ensure low drift and reliable operation under laboratory and field conditions.

Document Downloads

Product Overview

HONO Data Sheets

Configuration & Calibration

Additional Information

Key Applications & Advantages

Atmospheric HONO research

Sub‑ppb sensitivity supports nighttime chemistry and photochemical model validation.

Air‑quality monitoring

Direct HONO and NO₂ detection enables source attribution and urban process studies.

Laboratory studies

High precision and low drift support chamber experiments and instrument intercomparisons.

Mobile field campaigns

Low power demand, <5 s response time and robust design enable operation on cars and ships.

No calibration gas required

Quantification via molecular absorption cross sections; automatic zero ensures long‑term stability.

Robust and stable

Insensitive to humidity, temperature variations and vibrations; no sample drying needed.

Simple operation & connectivity

Browser‑based GUI with Wi‑Fi, LAN and RS232; supports multiple industrial communication protocols.

Specification Highlights

Parameter	Specification
Detection limits (60 s)	HONO: 0.08 ppb · NO₂: 0.16 ppb
Precision (60 s)	HONO: 0.04 ppb · NO₂: 0.08 ppb
Measurement ranges	HONO: 0–500 ppb · NO₂: 0–2000 ppb
Time resolution	1 second minimum
Response time	<5 s at 1.5 L/min
Cross sensitivities	No significant interference (H₂O, NOₓ, HCHO, O₃, COx, SO₂ …)
Temperature stability	<0.01 ppb/°C · Operating range –10 to +40 °C
Zero drift	Negligible zero drift with automatic zero check
Calibration	No HONO/NO₂ calibration gas required; optional gas‑free ICOM path‑length calibration
Power consumption	<40 W at 12 V
Connectivity	Wi‑Fi, LAN, RS232, OPC‑UA, analog voltage/current output
Housing & weight	19″ rack housing · <12 kg

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Find your local Airyx distributor or contact our Heidelberg team directly. Moreover, we support you with product questions, technical assistance and partnership inquiries.

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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

France

MEGATEC SAS
Saint-Aubin, France
Website: https://www.megatec.fr/
Contact: https://www.megatec.fr/contact
Contact person: Fabrice Losbar

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

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/

Additional Regional Availability

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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