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Oxygen Transmitter


The Vaisala SPECTRACAP® Oxygen Transmitter OMT355 is ideal for oxygen monitoring in moist and aggressive process gases. Typical applications include gas generation, inert gas blanketing, fermentation and composting process monitoring. The OMT355 is a high-grade industrial oxygen transmitter for % level oxygen measurements in industrial gases and processes. It can also be used for ambient oxygen measurements in demanding applications.

The OMT355 is available in three basic versions:
  • in-line version that can be flange-mounted directly in a gas stream through the wall of a duct, a reactor vessel or a container
  • sample cell version that can be used for pump aspirated sampling using a sampling system, in applications where in-line mounting is not possible
  • ambient environment version for measuring the ambient oxygen concentration


  • The OMT355 can be used for oxygen measurements in practically any application where the oxygen concentration in the gas exceeds 0.3 - 0.5 % O2. The customer benefits provided by the OMT355 are, however, most striking when the in-line version can be used and the probe installed directly in the measured gas. Examples of this kind of applications are fermentation and other bioprocesses, composting, inert gas blanketing, and inert gas generators. In the sampling configuration, the OMT355 can be used in a large number of applications such as air sepration plants and gas generators, biogas and landfill gas (in safe area installations), and even combustion/stack gas measurements provided that the sampling system is properly designed.

    In many applications, the OMT355 can be flange-mounted directly into a process. No sampling or sample conditioning equipment is needed. This feature provides real time measurement data without sampling or sample switching delays.

    Technical Specs

    Model OMT355
    Measurement Range 0 - 25% O2
    Sensor Vaisala SPECTRACAP
    Accuracy at 20ºC ±0.2% (including noise, linearity, and repeatability)
    Operating condition Temp: -20 to 80 ºC (probe), -20 to 60ºC (transmitter)
    Pressure: 0.8 - 1.4 bar, max 10 bar for probe
    Power supply 10-3 VDC
    Output 0-20mA, 4-20mA, RS-485
    Alarm/Control Relay: 30 VAC / 60 VDC
    Mechanics Protection: IP66
    Compliance ComplianceIEC(EN)-61326 Electrical equipment for measurement, control and laboratory use.
    EMC requirementsEN50104 Electrical apparatus for the detection and measurement of oxygen.
    Performance requirements and test methods.EN50271 Electrical Apparatus for the Detection and Measurement of Combustible Gases, Toxic Gases or Oxygen
    Laser safetyClass 3R laser product

    Data sheet

    CatalogueProduct Selection Form



    See also
    Oxygen Transmitter
    The Vaisala SPECTRACAP® Oxygen Transmitter OMT355 is ideal for oxygen monitoring in moist and aggressive process gases. Typical applications include gas generation, inert gas blanketing, fermentation .....


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