Optical IQ sensors for dissolved oxygen - WTW

Optical IQ sensors for dissolved oxygen - WTW

  • SKU: 201650
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  • Description

    Digital, optical, calibration free – dissolved oxygen senors for the IQ SENSOR NET

    Calibration-free, reliable, DIN compliant – the optical FDO® oxygen sensors for the IQ SENSOR NET to regulate biological cleaning steps:

    • Calibration and flow free
    • Insensitive to air bubbles
    • Low usage costs

    FDO® sensors are the perfect solution for measuring dissolved oxygen. In addition to being free of calibration and flow, with their 45° membrane, they are also insensitive to air bubbles. Therefore, you will not require any additional installation equipment. The robust design of this sensors allows the use with an overpressure of up to 10 bar. The special membrane has a unique stability and thus ensures stable measured values.


    FDO® 700 IQ optical oxygen sensor for the IQ Sensor Net to regulate biological cleaning steps.
    FDO® 701 IQ optical oxygen sensor for the IQ Sensor Net with a faster response time.
    FDO® 700 IQ SW and FDO® 701 IQ SW: The sea water models are optimized for use in special media: All wetted parts are made of titanium and plastic and are therefore extremely resistant to corrosion.


    • Wastewater, e.g. regulation of biological treatment
    • Drinking water
    • Aquaculture, e.g. monitoring of water quality
    • Surface water, e.g. river water monitoring
    • Industry
  • Specifications

    * SW: Sensor as sea water model (with plastic arming (POM))

    Icon: CE Product Certification for Xylem Analytics Products   Icon: Xylem Analytics Products that is cETL listed by Intertek   Icon: Xylem Analytics Products that is ETL listed by Intertek    detailed technical data see data sheet D2.02


    700 IQ

    700 IQ SW*

    701 IQ

    701 IQ SW*

    Order No.





    Measuring method


    Replacement caps

    SC-FDO® 700
    working life of 2 years 

    SC-FDO® 701
    working life of 6 months

    Measuring range (25 °C):


    0 ... 20,00 mg/l
    (0 ... 20,00 ppm)


    0 ... 200,0 %


    < 1 mg/l (ppm): ± 0,05 mg/l (ppm)
    > 1mg/l (ppm): ± 0,1 mg/l (ppm)

    Response time at 25 °C

    t90: < 150 s
    t95: < 200 s

    t90: < 60 s
    t95: < 80 s

    Temp. measurement

    Integrated NTC, 23 °F ... 122 °F (-5 °C ... +50 °C) ± 0.5 °C

    Ambient Conditions

    23 °F ... 122 °F (-5 °C ... +50 °C)
    -13 °F ... 122 °F (-25 °C ... +50 °C)

    23 °F ... 104 °F (-5 °C ... +40 °C)
    -13 °F ... 104 °F (-25 °C ... +40 °C)

    Electrical connections

    2-wire shield cable with quick fastener to sensor

    Weight (without cable)

    Ca. 900 g

    Ca. 1.500 g

    Ca. 900 g

    Ca. 1.500 g

  • Accessories
  • Video

    Sloped FDO® cap: no artificial readings, no additional mounting material

    The sloped cap of the FDO® oxygen sensor prevents the accumulation of bubbles and leads to reliable readings. Specific mounting equipment belongs to the past.


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