Electrochemical Oxygen Analyzer - EC900

The electrochemical oxygen analyzers of series 900 are designed to measure most accurately oxygen levels in gases. The EC900 is used worldwide in industrial and laboratory applications.

Various versions  of the EC900 allow measurings in trace, ultra trace or percent ranges.

The EC 900 is one of the worldwide most  sucessfully used  analyzers for residual oxygen measurings.

Among others these oxygen analyzers are used for quality assurance by well-know gas manufacturers.

These measuring devices work with a fuel cell which continuously measures the oxygen content in the sample gas.

Analyzers with a measuring range <1ppm …100% O2 are equipped with two measuring cells. The trace cell is controlled and protected via the percentage cell.

Sauerstoffmessung Sauerstoffspuren Gasanalyse Prozent Ppm Ppb EC900 EC910

Features of the oxygen analyzer EC900

The  oxygen analysers of series EC900 are available with two different sensors. These sensors switch to each other in order to increase measuring time and their lifetime.

  • T90 : 30 sec
    (RACE™ sensor)
  • Response time O2
    in inert gas: 20.9% <20ppm O2 within 3 min
  • Sensor lifetime:
    3 to 6 years, depending on version and application up to 10 years
    (Data for EC903)

The EC900 is available with three various casing types. All casings can be upgraded on demand. Additional plugs, mounting brackets, handles or jack rings can be mounted.

  • Panel mounted or bench-top casing
  • NEMA 4X/IP66 waterproof and weatherproof casing EC920
  • 19″ rack mount casing EC930

Depending on the required measuring range, various sensors can be used.  Four configurations are available for this, starting with measurements of oxygen in percent ranges, measurements of residual oxygen up to ultra trace analysis.

  • Percent measurement – EC 900
    Measurement range: 0.3% …100%
  • Trace measurement – EC901
    Measurement range: 0.1ppm …1%
  • Ultratrace Measurement-EC902
    Measurement range: 0.01ppm … 100 ppm
  • RACE – EC903
    Measurement range: 0.1ppm …100%

The EC903 RACE is by far the most popular and most widely used oxygen analyzer in the world. For most applications this analyser can display the total oxygen value and is most unaffected against a premature failure of the sensors. In atmospheres with hydrogen insensitive sensors can be used.


The electrochemical analyzers can be equipped with accessories and numerous configurations. The result is an oxygen analyzer precisely tailored to customer’s applications.

For example:

  • Level alarms (digital changeover contacts)
  • Up to 3 free programmable analog outputs
    (switchable between 0…20mA, 4…20mA and 0…10V)
  • Shut-off valves – recommendable if the analyzer is not used continuously (extends the lifetime of the cells)
  • Integrated sample gas pump
  • Stronger integrated sample gas pumpe
  • External pump
  • Filters
    (analysing filters, coalescence filters,
  • Condensate membrane
  • Flow alarm
  • Bypass for quicker response times
  • Pressure regulator
  • Tubing from stainless steel
  • Inert gas regulation
  • (Nitrosave)
  • Auto calibration
  • 24V/DC version
  • Mounting and installation accessories
  • Case flushing

Applications and benefits of the oxygen analyzer at a glance


  • Additive manufacturing
  • Aluminium industry
  • Analysis gas storage
  • Food and beverage industry
  • MAP packaging monitoring
  • Glass manufacturing
  • Inert glove boxes
  • Semiconductor industry
  • Bond ovens
  • Heat treatment equipment
  • Inert gas regulation
  • Ceramics
  • Adhesive industry
  • Soldering systems
  • Pharmaceutical industry
  • Thermical afterburning
  • Sinter and reflow furnaces
  • Heat treatment
  • UV Print
  • Molding
  • Petrochemical and Polychemical industry
  • Pyrolysis process
  • Reflow furnaces
  • Welding systems

Benefits at a glance


  • Long lifetime of the sensors
  • Extremely fast response times
  • Good reproducibility of measuring values
  • Extremely low measurement inaccuracy (<2% of the reading)
  • Numerous configuration options
  • Insensitive against hydrogen
  • Cost saving by inert gas regulation
  • Maintenance and calibration carried out by APM
  • Insensitive to  vibrations and change of position
  • Good readability
  • User-friendly
  • USB interface
  • Computer software inclusive

0.1ppm ...100% O2

Various versions

Combinable with other measuring devices

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