Ambient Level Gas Analyzer


  • Ambient air monitoring
  • Outdoor and indoor application
  • Certification and calibration
  • Research


  • Precise and continuous ambient air monitoring
  • Measurement of pollutants in fixed and mobile stations
  • Indoor air quality
  • TLV and personnel safety


  • Compact and modular design
  • Adaptable measurement ranges
  • Remote operation, control and maintenance
  • Graphical user interface “GUI“ for individual analyzer operation and data Management


100 ppb – 50’000 ppb

Minimum Detectable Concentration

0.4 ppb


NO / NO2 / NOx /



Ambient Level Gas Analyzer 

The nCLD AL3 is the next generation in single-channel high precision ambient air monitoring instrumentation. Unique in speed and reliability, the nCLD AL3 is modular designed and capable of sequentially measuring NO, NO2, NOx and NH3,. The analyzers expandable capabilities allow assessment of additional nitrogen based parameters. Its graphical user interface also individually displays and connects to other instruments’ data.

Flexible Ambient Air Monitoring
The nCLD AL3 is the ideal instrument for ambient air monitoring, either installed in racks, fixed monitoring stations or mobile laboratories. Besides the ambient air in the open environment, the analyzer is also suitable for air quality monitoring in production plants and offices (TLV = threshold limit value). The nCLD AL3 is a one-channel NOX-detector based on a modular principle. The measurement ranges are individually adjustable, the parameters are NO, NO2,NOX and NH3. The instrument’s inlet operates at ambient pressure. Calibration of the unit runs quick and automatic while all necessary data is continuously stored and readily available anywhere and at any time.

User Friendliness
The new touch sensitive graphical user interface enables the user to individually adjust the instrument operation and data management according to his/ her needs and applications. The bright 7” monitor gives a clear overview and allows numerical and graphical display of values. Multiple digital in- and outputs guarantee a maximal connectivity and flexibility for the remote operation, control and maintenance of the nCLD AL3, ensuring unsurpassed precision and reliability.

Compact, Modular and Intelligent!
The nCLD AL3 is manufactured in a new compact and modular layout, in which each essential component of the chemiluminescence analyzer hosts its own CPU and interacts with other CPUs by BUS-communication. This assembly increases accessibility and serviceability by reducing wiring and piping. The measurement principle will conform to the standard method for NOX-detection in ambient air (EN 14211).

Analyzer type three chamber CLD with cooled PMT for parallel measurement of NO, NO2, NOx, NH3
Measuring ranges four freely selectable ranges from 100 ppb – 50’000 ppb
Min. detectable concentration* 0.4 ppb
Noise at zero point (1σ) * <0.2 ppb
Lag time 3 sec
Rise time (0-90%) <1 sec (single-channel mode)
Temperature range 0 – 40 °C
Humidity tolerance 5-95% rel. h (non-condensing, ambient air and sample gas)
Sample flow rate 300 ml/min
Input pressure 600 -1200 mbar abs.
Dry air use for O3 generator internally generated (no external supply gas required)
Power required 350 VA (incl. membrane pump and ozone scrubber)
Supply voltage 100-240 V/50-60 Hz
Interface USB(3x), HDMI, Bluetooth, RS232 (w/o 9pin connector), LAN, WLAN

height: 133 mm (5¼ ”)

width: 450 mm (19 ”) with molding: 495 mm

depth: 540 mm (21.2 ”)

Weight 23 kg (51 lb.)
Delivery includes nCLD AL3 analyzer, power cable, FTDI-RS232-USB cable, USB-LAN adapter, HDMI adapter
Standard nCLD AL3

· Y – molybdenum converter

· C – Catalyst converter


· USB-RS232 9pin connector

· analog output (external box): 0-10 V ; 4-20 mA into 500 Ω max.

*Depending on filter setting.
Connectivity properties are country-specific.
ECO PHYSICS reserves the right to change these specifications without notice.


Further information can be found in the Product Brochure

Download Brochure


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