OxyTrak 390 Ex-Situ Flue Gas O2 Analyzer


Accurate & economical combustion process monitoring

The OxyTrak™ 390 ex-situ flue gas analyzer is ideally suited for measuring unburned oxygen levels in dirty, rugged combustion applications. A diffusion convection loop design provides high levels of accuracy with minimal service or maintenance required.

Vaisala SPECTRACAP® Oxygen Transmitter OMT355







  • An optical, diode laser based oxygen analyzer for industrial gas measurements.
  • Minimizes need for sample conditioning equipment.
  • In-situ probe or sampling cell options.
  • Tolerates aggressive chemicals.
  • Tolerates excessive amounts of moisture even in liquid form.
  • Low maintenance.
  • Diagnostic output for preventive maintenance.
  • Heated optical surfaces to prevent condensation


    Technical Specifications



    Measurement range ​0 ... 100 % O2
    Accuracy (including noise,
    linearity, and repeatability)

    ±0.2 % O2
    Temperature dependence
    over T range

    ±2 % of reading
    Stability ±1 % of reading/year
    Zero drift ±0.1 % O2/year
    Response time of

    3 s
    Diffusion limited response in
          still air

         without filters 10 s / 20 s
         with stainless steel mesh filter 10 s / 25 s
         with stainless steel mesh        and PTFE filters
    30 s / 70 s

    Operating environment

    Operating temperature range
         for probe (in-line installation) -20 ... +80 °C
         for electronics (housing) -40 ... +60 °C
         for transmitter
         (ambient gas measurement)

    -20 ... +60 °C
    Operating pressure range 0.8 ... 1.4 bar
    Maximum pressure range for
    up to 10 bar

    Inputs and outputs

    Power supply 11 … 36 VDC
         input range
    Power consumption
         maximum 6 W
         typical 3 W
    Analog output 0/4 … 20 mA, sourcing
         maximum load 500 Ω
    Serial output
    (2-wire non-isolated)

    Alarm/control relay 30 VAC/60 VDC


    Housing material G-AlSi10 Mg (DIN 1725)
    Probe material AISI 316
    Housing classification IP66
    Weight 2.2 kg
    Mounting flance diameter
         Can be fitted to standard
         flanges. Minimum sizes:
         DIN (2527B) DN50 and
         (150) 2.5"
    96 mm
    Cable bushing
    Stainless steel mesh filter Cable gland M20 x 1.5
    openings Ø 310
    Wetted materials
    AISI 316, EPDM or Kalrez
    (optional), PTFE (optional), SiN, MgF

Flue Gas Analysis

Flue Gas Analysis Overview
Our zirconium oxide analyzers for flue gas analysis and combustion control serve applications from low to high temperatures and from clean fuels to ones producing high particulate levels.

APX Advanced Paramagnetic Analyzer

The APX advanced paramagnetic oxygen analyzer combines the benefits of the GE Panametrics XMO2 and TMO2 thermoparamagnetic transmitters with advanced background compensation features that allow the analyzer to operate in applications with widely varying, defined or undefined hydrocarbon background gases. This makes the APX an ideal choice for applications such as barge loading, flare gas, vapor recovery, refinery gas and tanker off-loading.