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HomeProductsProduct categoriesSensor technologyDigital IDS plug head sensors (lab) > IDS optical dissolved oxygen sensors – wireless ready

Optical IDS dissolved oxygen sensors with universal plug head – digital & wireless ready

WTW sensors digital optical dissolved oxygen sensor (IDS) with plug head FDO® 925-P

FDO® 925 – optical oxygen sensors for applications in the lab and process, field and wastewater treatment systems - low-maintenance, quick and wireless

  • Saves time and money – low-maintenance & quick (t99 < 60s)
  • Flow-free with beveled membrane
  • Factory calibrated sensor cap with smart chip

The FDO® 925 is especially suited for lab and process thanks to its compact size. The flow-free, easy to clean beveled membrane allows it to be used in containers with low sample volumes. Also, low oxygen concentrations below 1 mg/l can be shown exactly.

WTW's proven FDO® 925 is now available as sustainable plug head version. The universal plug head fits the sensor with wireless functionality – disturbing cables are no longer required.
Furthermore it can be connected to AS/IDS-x cables with lengths of up to 100 m. With this new technology WTW significantly expands the range of applications and the measuring comfort of its optical dissolved oxygen sensors.


Model Description Order no.
FDO® 925-P Optical oxygen sensor with plug head for use with the MPP IDS, to connect to cable AS/IDS-x or wireless modules IDS WLM-S 201306

Technical Data

Concentration 0.00…20.00 mg/l ± 0.5 % of value
Saturation 0.0 … 200.0 %± 0.5 % of value
Partial pressure 0.0 to 400 hPa± 0.5 % of value
Temperature 0 … 50.0 °C ± 0.2 °C


Model Description Order no.
IDS WLM-S Wireless module for plug head sensor 108141
IDS WLM-M Wireless module for IDS meter 108142
WLM-Charger USB charger for wireless modules 108143
IDS WLM Kit Kit consisting of wireless module for sensor and meter (one of each), USB charger and universal USB power supply 108144
NT USB Universal Universal USB power supply 902872
SC-FDO® 925 Replacement cap for FDO® 925 201310
FDO® Check Check/calibration container 201311
ADA FDO®/RZ Stirringn attachment, i.e. for BSB5 measurement 201312
FN FDO® Nut to attach the cap, without protective basket 201313
AS/IDS-1.5 Connecting cable for MPP IDS as well as plug head sensors, length 1.5 m 903850
AS/IDS-3 Like above, 3 m 903851
AS/IDS-6 Like above, 6 m 903852
AS/IDS-10 Like above, 10 m 903853
AS/IDS-15 Like above, 15 m 903854
AS/IDS-20 Like above, 20 m 903855
AS/IDS-25 Like above, 25 m 903856
AS/IDS-40 Like above, 40 m 903857
AS/IDS-60 Like above, 60 m 903858
AS/IDS-100 Like above, 100 m 903859
A 925-P Replacement head with existing protective basket 903838
A 925-P/K Arming for IDS –P sensors with protective basket made of POM 903839
A 925-P/S Arming for IDS –P sensors with protective basket made of stainless steel 903840
D 3Sen Flow vessel for field measurements 903842
KF 12 Karlsruhe bottle, minimum order 10 bottles 205700
TS 19 Funnel set for BSB5 determination with CellOx® 325/FDO® 925 in Winkler bottles, NS 19. 205710
FD 19/KA Fixation lid for Karlsruhe bottle KF 12 205711
FR 19 Fixation ring, recommended for measuring with Karlsruhe bottle for CellOx® 325 and FDO® 925 205712


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