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HomeProductsProduct categoriesSensor technologyDigital IQ sensors (online) > IQ optical dissolved oxygen sensors

Digital IQ sensors for dissolved oxygen

Digitale IQ Sensoren für gelösten Sauerstoff FDO® 700 IQ von WTW
WTW sensors digital IQ dissolved oxygen sensor FDO® 700 IQ
WTW sensors digital IQ dissolved oxygen sensor FDO® 700 IQ SW

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.

The sea water model (FDO® 700 IQ SW) is optimized for use in special media: All wetted parts are made of titanium and plastic and are therefore extremely resistant to corrosion.


Model Description Order no.
FDO® 700 IQ Optical O2 sensor for connection to the IQ Sensor Net. (Please order cable separately) 201650
FDO® 701 IQ like the FDO® 700 IQ, but with a faster response time 201660
FDO® 700 IQ SW like the FDO® 700 IQ, but as sea water model with plastic arming (POM) 201652
FDO® 701 IQ SW like the FDO® 700 IQ SW, but with a faster response time 201653

Technical Data

* SW: Sensor as sea water model (with plastic arming (POM)
FDO® 700 IQ FDO® 700 IQ SW* FDO® 701 IQ FDO® 701 IQ SW*
Measuring ranges:
O2 concentration 0 ... 20.00 mg/l (0 ... 20,00 ppm) _H _H _H
O2 saturation 0...200.0 % _H _H _H
O2 concentration 0.01 mg/l (0.01 ppm) _H _H _H
O2 saturation 0.1 % _H _H _H
Response time: t90: <150 s
t95: <200 s
_H t90: <60 s
t95: <80 s
Temperature measurement Integrated NTC, -5 … +50 °C _H _H _H
Operating temperature -5 … +50 °C _H _H _H
Pressure resistance 10 bar overpressure _H _H _H


Model Description Order no.
SC-FDO® 700 Membrane cap for FDO® 700 IQ 201654
SC-FDO® 701 Membrane cap for FDO® 701 IQ 201655
MSK FDO® Membrane protective basket, protects from fish bites and stone impacts 205253
MSK FDO® CS Cleaning set for FDO® in connection with MSK FDO® 205254


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