WTW FDO Online Dissolved Oxygen Sensor

Optical and electro-chemical sensors for the measurement of dissolved oxygen with analog monitors or the modular and flexible IQ Sensor Net

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

The correct choice of measuring technology for dissolved oxygen is very important for the performance capacity of a wastewater treatment plant. For decades, WTW has been doing pioneer work in the area of dissolved oxygen measuring technology. The result of consequent development processes, innovation and application-specific experience are online oxygen meters, which prove to offer highest precision, reliability and cost-effectiveness.

In addition to the proven analog and digital sensors of the 700 series, you will also get 701 sensors with all models with a quicker response time. In the product range of digital TriOxmatic® sensors, there is also a 702 sensors for trace measurement. All sensors have an integrated NTC temperature sensor for temperature compensation and can also be used for pipe installations by means of suitable replacement fittings.

The proven monitors of model series 170 and 296 have a PI/PF control algorithm. Their integrated lightning protection and the galvanized separated outputs offer high operational safety. With the IQ Sensor Net and the digital IQ sensors, there will be enormous flexibility in the design and later expansion of your measuring system. The calibration-free FDO® sensor will save you time, money and work effort.

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