WTW Online Dissolved Oxygen (DO) Measurement

WTW has been continuously designing, manufacturing and satisfying the demands for reliable dissolved oxygen measurements with the most advanced online systems available anywhere.

  • Features
  • TriOxmatic® Digital D.O. Sensors
  • FDO® Digital D.O. Sensors

Measuring • Monitoring • Controlling
Reliable and continuous measurements of dissolved oxygen have become of vital importance in many areas of the water/wastewater treatment facilities. The availability of accurate and timely measured concentration values is an absolute need for process monitoring and dynamic process control to ensure an efficient plant operation.

For more than 50 years now, WTW has been recognized as a leader in the field of Dissolved Oxygen measurements. Innovative technologies, creative and continuous product development, and extensive application expertise have resulted in superior instruments and systems of outstanding performance, reliability and design for the most precise online measurements available. The optical D.O. sensor FDO® 700 IQ combines state-of-the-art technology with application applied benefits.

WTW D.O. Measurement Systems
WTW has been continuously designing, manufacturing and satisfying the demands for reliable dissolved oxygen measurements with the most advanced online systems available anywhere.

The WTW product line includes a wide range of precision D.O. sensors and monitors as well as the revolutionary IQ SENSOR NET system so that the optimum system configuration can be chosen for the particular application.

Type TriOxmatic® 700 IQ (SW*) TriOxmatic® 701 IQ TriOxmatic® 702 IQ
Measuring method Electrochemical Electrochemical Electrochemical
Measuring range (25 °C)
O2 concentration 0.0 ... 60.0 mg/l 0.00 ... 20.00 mg/l
0.0 ... 60.0 mg/l
0 ... 2000 µg/l
0.00 ... 10.00 mg/l
O2 saturation 0 ... 600 %

0.0 ... 200.0 %
0 ... 600 %
0 ... 110 %

Response time at 25 °C t90: 180 s t90: 30 s
t99: 90 s
t90: 30 s
t99: 110 s
Minimum flow rate 0.05 m/s 0.23 m/s 0.3 m/s
SensCheck SensLeck (700 IQ)
SensReg (700 IQ/700 IQ SW)
SensLeck
SensReg

SensReg
Signal output Digital Digital Digital
Sensor memory for
calibration values
Yes Yes Yes
Power consumption 0.2 Watt 0.2 Watt 0.2 Watt
Temp. measurement Integrated NTC, 23 ... 140 °F (-5 °C ... +60 °C)
Temp. compensation 32 ... 140 °F (0 °C ... +60 °C)
Maximum pressure 10 bar (incl. sensor connection cable)
Ambient conditions Operating temperature: 32 ... 140 °F (0 °C ... +60 °C)
Storage temperature: 32 ... 149 °F (0 °C ... +65 °C)
Electrical connections 2-wire shield cable with quick fastener to sensor
Input power Powered by IQ Sensor Net
Translet voltag protection Yes
EMI/RFI Conformance EN 61326, Class B, FCC Class A; Intended for indispensable operation
Certifications CE, cETL, ETL
Mechanical Membrane head assembly, locking cap: POM
Sensor body: 316 Ti stainless steel
Protection rating: IP 68
Dimensions
(length x diameter)
14.17 x 1.57 in. (360 x 40 mm);
SW: 14.17 x 2.34 in. (360 x 59.5 mm)
incl. connection thread of SACIQ sensor connection cable
Weight
(Approx.)
1.46 lb (660 g, without sensor connection cable);
SW: 2.58 lb (1,170 g)
Guaranty 2 years for sensor acc. § 10 AGB
Type FDO® 700 IQ (SW*) FDO® 701 IQ (SW*)
Measuring method Optical Optical
Measuring range (25 °C)
O2 concentration 0 ... 20.00 mg/l
(0 ... 20.00 ppm)
O2 saturation 0 ... 200.0%
Response time at 25 °C t90: <150 s
t95: <200 s
t90: <60 s
t95: <80 s
Minimum flow rate No drift required
SensCheck Monitoring of membrane function
Signal output Digital Digital
Sensor memory for
calibration values
Yes Yes
(factory calibrated)
Power consumption 0.2 Watt 0.7 Watt
Temp. measurement Integrated NTC, 23 ... 140 °F (-5 °C ... +60 °C)
Temp. compensation 23 ... 122 °F (-5 °C ... +50° C)
Maximum pressure 10 bar (incl. sensor connection cable)
Ambient conditions  
Operating temperature: 23 ... 122 °F
(-5 °C ... +50 °C)
23 ... 104 °F
(-5 °C ... +40 °C)
Storage temperature: -13 ... 122 °F
(-25 °C ... +50 °C)
-13 ... 104 °F
(-25 °C ... +40 °C)
Electrical connections 2-wire shield cable with quick fastener to sensor
Input power Powered by IQ Sensor Net
Translet voltag protection Yes
EMI/RFI Conformance EN 61326, Class B, FCC Class A; Intended for indispensable operation
Certifications CE, cETL, ETL
Mechanical Sensor cap, fixation: POM, PVC, silicone, PMMA
housing shaft: VA steel 1.4571 protection type IP 68
Dimensions
(length x diameter)
15.75 x 1.57 in. (400 x 40 mm)
SW: 15.75 x 2.34 in. (400 x 59.5 mm)
incl. connection thread of SACIQ sensor connection cable
Weight
(Approx.)
1.98 lb (900 g)
SW: 3.31 lb (1.5 kg)
Guaranty 2 years for sensor acc. § 10 AGB