(NO + O2) Analyzer

Cross Duct Multi Gas

GasEye Cross Duct MG NO/O2

in-situ nitric oxide and OXygen analyzer

GasEye NO/O2 is a high performance in-situ nitric oxide and oxygen analyzer. Suitable for safety applications and process control. 24/7 continuous operation. No sample preparation. No zero drift. No field calibration. Low cost of ownership.


  • NO ranges: 0 – 50 ppmv to 0 – 50 vol%
  • O2 ranges: 0 – 1 vol% to 0 – 100 vol%
  • Process temperature: 0 – 550°C
  • Real time sensing: response time below 0.1 second
  • High selectivity: automatic compensation for interference effect from other constituents in the gas sample
  • High sensitivity: detection limits down to ppb range
  • In-situ monitoring: direct in the process, no sample preparation
  • Maintenance free: equipped with a self-calibrating feature, no field calibration necessary
  • Robustness: IP66 enclosure, suitable for outdoor and indoor installations and harsh environments
  • Insensitive to dust and smoke in the measured process: up to 50 g/m3
  • ATEX version available

Example Applications

  • Denitrification (deNOx)
  • Process control
  • Emission monitoring

Example Industries

  • Power industry
  • Chemical industry
  • Metallurgy industry

Application type

Analytical performance
Concentration measurement range NO/O2: 0 – 5000 ppmv / 0 – 25 vol%
Detection limit (LOD) NO/O2: 0.01 ppmv*m / 100 ppmv*m
Precision: LOD or 1% of the measured value, whichever is larger
Accuracy: LOD or 2% of the measured value, whichever is larger
Process dust load: up to 50 g/Nm3 depending on the process
Calibration: certified span gas
Zero drift and span drift: negligible
Measurement conditions
Process gas temperature: 0ºC to 550ºC
Process gas pressure: 0.7 – 2 barA
Maximum path length: up to 25 meter
Dynamic performance
Warm-up time: approx. 5 minutes
Minimum response time (T90): 100 milliseconds
Climatic conditions
Ambient temperature: -20ºC to +55ºC
Ambient pressure: 800 – 1200 hPa
Ambient humidity: RH < 99%, non-condensing
Process Purging (if necessary)
Purging gas: instrument air or N2
Process purge flow rates: 5 – 50 l/min
Sensor purge flow rates: 0.2 – 7 l/min

Technical specification

Outputs: configurable 4 x analog output, 4 – 20 mA (for example: CO concentration, O2 concentration, process transmission, 1 x process temperature (optional)), easy user selection via DIP switch between active/passive mode
8 x digital output (NAMUR)
Inputs: configurable 4 x analog input, 4 – 20 mA (for example: process temperature, pressure), easy user selection via DIP switch between active/passive mode
1 x RTD (PT100/PT1000) – easy user selection via DIP switch between PT100/PT1000 and 2-/3-/4-wires
8 x digital input
Local User Interface: Human Machine Interface (HMI) – LCD backlight display located on the transmitter housing lid
Ethernet port:
a) WebServer – system configuration and data acquisition via web browser,
b) Windows based program – GasEye logger for real-time data acquisition,
c) remote service and diagnostics
Optional: Modbus (TCP/IP), Modbus RTU, Profinet, Profibus
Electrical Characteristics
Power input: 24 VDC nominal (19 – 30 VDC)
Power consumption: < 25 VA (< 35 VA if ATEX)
Additional build-in features
Automatic gain control (AGC): AGC ensures correct gas measurement even at high dust loads resulting in loss of optical transmission down to 0.5%. AGC operates fully automatic with no need for manual adjustment of the signal gain under any process conditions.
Self-calibration features: Internal reference gas compartment is used for closed loop control of the zero and span drift
Download a file:
GasEYE system elements: preview | download
Active analog input: preview | download
Active analog output: preview | download
Passive analog input: preview | download
Passive analog output: preview | download
Isolated Digital Input: preview | download
Isolated Digital Output: preview | download
Power Supply: preview | download
RemoteRX: preview | download
PT100/PT1000 2-wire: preview | download
PT100/PT1000 3-wire: preview | download
PT100/PT1000 4-wire: preview | download
Dimensions: width x height: 330 mm x 230 mm,
length: 350 mm
Weight: 15 kg
Equipment: 2 x laser sockets,
purging fittings
Dimensions: width x height: 160 mm x 160 mm,
length: 330 mm
Weight: 13 kg
Equipment: 1 cable gland,
purging fittings
Central Unit
Dimensions: width x height: 330 mm x 230 mm,
length: 110 mm
Weight: 5 kg
Equipment: display with status indicators,
6 cable glands, Ethernet socket,
purging fittings
Housings: RAL 5010 coated aluminum, (optional RAL 7040)
Process interface: stainless steel 316 with quartz window, DN50 PN16 (EN 1092-1), DN65 PN6 with easy to clean window, optional other standards (ANSI, JIS)
Purging tubes: inside diameter: 38 mm, length: 400mm (optional other dimensions), stainless steel 316 (optional PTFE coating)
Process gaskets: reinforced graphite
Download a file:
GasEYE Cross Duct units construction elements: preview | download
GasEYE Cross Duct instrument assembly: preview | download
GasEYE Cross Duct cross-section: preview | download



Low Voltage Directive (LVD) 2014/35/EU PN-EN 61010-1:2011
Laser radiation: Laser Class I product acc. to PN-EN 60825-1:2014-11
EMC Directive 2014/30/EU EN 61326-1:2013
RoHS Directive 2011/65/EU
ATEX Directive 2014/34/EU EN IEC 60079-0:2018 – Explosive atmospheres – Part 0: Equipment – General requirements
EN 60079-2:2014 – Explosive atmospheres – Part 2: Equipment protection by pressurized enclosure “p”
EN 60079-26:2015 – Explosive atmospheres – Part 26: Equipment with Equipment Protection Level (EPL) Ga
EN 60079-28:2015 – Explosive atmospheres – Part 28: Protection of equipment and transmission systems using optical radiation

Explosion protection (standard version):

  • ATEX II 3G [Ex op is IIC T6 Gc]
  • ATEX II 3D [Ex op is IIIC T85°C Dc]

Explosion protection (optional version):

  • II (1)/2G Ex pxb [op is Ga] IIC T6 Gb
  • II (1)/2D Ex pxb [op is Da] IIIC T85°C Db

Certificate No. KDB 20ATEX0003X EN
Certificate No. KDB 20ATEX0003X PL

Explosion protection (optional version):

  • Ex op is pzc IIC T6 Gc
  • Ex op is pzc IIIB T85°C Dc

Certificate No. IECEx KDB 19.0004X

More information