ICAD-HONO/NO2-210L In‑Situ Monitor
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 |
Airyx works with trusted distributors worldwide to provide local support for open‑path DOAS, MAX‑DOAS and air‑quality monitoring solutions.
For direct inquiries, please use the contact form below.
The map below shows the regions currently supported by our international distributor network.
EUROPE
FRANCE:
MEGATEC SAS
Immeuble Homère, Les Algorithmes
91190 Saint-Aubin, France
Phone: + 33 1 69 35 58 00
Website: https://www.megatec.fr/
Contact: https://www.megatec.fr/contact
Contact person: Fabrice Losbar
SLOVAKIA, CZECH & LITHUANIA:
ENVItech Bohemia s.r.o.
Ovocná 34
161 00 Praha 6
Czech Republic
Webite: ENVItech Bohemia s.r.o.
Contact: Contact
SPAIN & PORTUGAL:
GREEN LIGHT RESEARCH SLU
Airyx products at Green Light Research:
ICAD NOx analysators
ICAD HONO/NO2 anaylsator
Open Path remote sensing
SkySpec remote sensing
ITALY:
LUCHSINGER SRL
Website: http://www.luchsinger.it/
Airyx Products | Luchsinger
UNITED KINGDOM & IRELAND:
CURA TERRAE AIR LTD
(FORMERLY ENVIRO TECHNOLOGY SERVICES LTD)
Unit B1, Kingfisher Business Park, London Road,
Stroud, Gloucestershire, GL5 2BY, UK
Phone: +44 (0) 1453 733200
Website: www.et.co.uk
NO₂/NOx/NO Analyser High Grade Version (ICAD 200DL) | ET
AirYX Plume Chasing - NO2 / NOX / NO ICAD In Situ Monitor | ET
AirYX HONO / NO2 Analyser (Model ICAD 200L) | Enviro Technology Services (et.co.uk)
NETHERLANDS, BELGIUM, LUXEMBOURG, DENMARK, SWEDEN, NORWAY:
THE DUTCH SCIENTIST
Kardinaal van Rossumplein 11
5211 RV ‘s-Hertogenbosch
The Netherlands
Phone: +31 629 437 116
Website: www.thedutchscientist.com
FINLAND:
HNU NORDION
Atomitie 5 B 600371, HELSINKI, FINLAND
Phone: +40 745 6225
Website: https://hnunordion.fi/
GREECE:
Polaris Environment Ltd
Complete Environmental Solutions
44 Lagoumitzi Str, 11745 Athens, Greece
Attn. Grigoris Nikolidakis
Phone: +306975906253
Website: www.polaris-environment.gr
ROMANIA (ICAD only):
APEL LASER
Mogosoaia, Strada Vanatorilor nr. 25, cod 077135, jud. Ilfov, Romania
Phone: +40 21 31 70 910
Website: Apel Laser » Lighting the Future
ROMANIA (Open Path, SkySpec, WGA):
PHANOS
Bucharest-Ploiesti Road 17, 7th floor, Bucharest, 013682, Romania
Website: Apel Laser » Lighting the Future
Contact
BULGARIA, SERBIA, NORTH MACEDONIA, ALBANIA, MONTENEGRO, SLOVENIA, CROATIA, TURKEY:
STABO-Tech. Ltd.
ul. Dimitar Naumov, 88
6000 Stara Zagora, Bulgaria
Phone: 0039 349 5440483
Website: http://stabo-tech.eu/
ASIA
INDIA:
M&G analyser systems
501,Zenith commercial complex
28/2 Near Agricultural college.
Shivaji Nagar, Pune -411007, India
Website:
:: M & G Analyser Systems | Pune ::
Contact:
:: M & G Analyser Systems | Pune ::
Phone: +91 9822667465.
Kind Attn: Hemanth Krishna Martha,
VIETNAM:
REECO Science and Technology Co., Ltd.
Building A, Software Technology Park, Vo Truong Toan Street,
Vietnam National University, Quarter 6, Linh Trung Ward, Thu Duc City,
Ho Chi Minh City, Vietnam
Website:
Air quality monitoring equipment - Reeco (reecotech.com.vn)
Contact:
INDONESIA:
PT JJExotranoz Inter Vania
Jln. Raya Boulevard Q1 no. 5, Cibubur, Indonesia
Contact: Jefry KP
CHINA:
LICA United Technology Limited
The 5th.Building,No.18,Anningzhuang East Road
Haidian District, 100085, Beijing, China.
Website: LICA United Technology Limited (li-ca.com)
Airyx Products:
ICAD NO2 / NOx / NO Analyzer - Trace gas measurement
ICAD NO2 / NOx / NO分析仪 - 痕量气体测量 - 北京理加联合科技有限公司 (li-ca.com)
REPUBLIC OF KOREA:
Aireet Inc.
105-502 (5F), 16, Gakhwa-daero 69beon-gil, Buk-gu
Gwangju, Republic of Korea
Phone: +82 (0)10-9350-8148
Website: www.aireet.co.kr
Contact Person: Joonwoo Kim
RUSSIA AND CIS - (ARMENIA, AZERBAIJAN, BELARUS, KAZAKHSTAN, KYRGYZTAN, MOLDOVA, TAJIKISTAN, AND UZBEKISTAN):
Eniseylab Ltd
Russia, 660025, Krasnojarsk, Shelkovaya, 10, Room 102
Phone: +7 (391) 271-66-50
Contact Person: Dmitriy Zhiltsov
Website: www.eniseylab.ru
