nCLD AL3 / 8555 CY

Modular Gas Analyzer


  • Burners and boilers
  • Manufacturers of gas turbines
  • Certification and calibration
  • DeNOx Plants and SCR
  • Refining of fuels and lubricants
  • Assessment of ammonia slip
  • Research and development


  • Rapid system integration and rack mounting
  • Compact and modular design
  • Virtually maintenance free even in continuous operation
  • Four freely selectable measuring ranges (with dual inlet: two per channel)
  • Choice between different types and numbers of converters


100 ppb – 50 ppm

Minimum Detectable Concentration

0.4 ppb


NO, NO2, NOx, NH3 , NOx – Amines


Modular Gas Analyzer

The nCLDAL3 /8555 CY analyzer is the next generation in high precision nitrogen oxide measurement. Unique in speed and reliability, the nCLDAL3 /8555 CY is modular designed and capable of simultaneously NO, NO2, NOX, NH3 and NOX-Amines. The new and intuitive graphical user interface also individually displays and connects to other instruments’ data.

nCLD – A New Generation

The nCLD AL3/8555 CY includes everything that is needed for instant, simultaneous measurement of NO, NO2, NOX, NH3 and NOX-Amines. The fully revised detector-block, the enhanced gas flow paths and the improved pressure as well as temperature independence of the nCLD 800 Series instruments allow for even lower detection limits. Overall stability and reliability are lifted to a new level. The optional electro-mechanical bypass system balances out even fastest pressure variations occurring in the sample flow. Furthermore, the analyzer is adaptable to numerous non-standardized applications. The Calibration of the unit runs quickly and automatically with all necessary data 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 for your remote operation, control and maintenance of the nCLD AL3/8555 CY, ensuring unsurpassed precision and reliability.

Compact, Modular and Intelligent!

The nCLD AL3/8555 CY 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 stationary source emissions (EN 15267, 14211).

Analyzer type three chamber CLD with cooled PMT for measurement of NO, NO2, NOX, NH3 and NOX-Amines
Measuring ranges four freely selectable ranges from 100 ppb – 50 ppm
Min. detectable concentration* 0.4 ppb
Noise at zero point (1σ)* 0.2 ppb
Lag time <3 sec
Rise time (0-90%) <1 sec
Temperature range 0-40 °C
Humidity tolerance 5-95% rel. h (non-condensing, ambient air and sample gas)
Dry air use for O3 generator internally generated (no external supply gas required)
Sample flow rate 1.0 l/min
Input pressure 600 – 1’200 mbar abs.
Power required 350 VA (incl. membrane pump and 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: 495mm

depth: 540 mm (21.2”)

Weight 23 kg (51 lb)
Delivery includes nCLD AL3/8555 CY analyzer, power cable, USB-LAN adapter

nCLD AL3/8555 CY: NO, NO2, NOX, NH3, NOX-Amines analyzer

· C – catalytic converter

· Y – molybdenum converter


· USB-RS232 9pin connector

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

For nCLD 8555 CY: optional hot tubing h and eltro-mechanical presure regulation r

*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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