WTW IQ Online Monitoring System

The IQ Sensor Net system is the most flexible, digitally based online system that provides from 1 to 20 measuring points. The module based system allows you to "grow" your system as your conitnuous water quality monitoring needs change.
For the measuring and control of wastewater, WTW offers the world's most complete line of pH/ORP, D.O., Conductivity, Nitrogen, Carbon, Phosphate, and unique self-cleaning Turbidity instrumentation, as well as comprehensive accessories.

  • Features
  • System Selection
  • IQ Sensors
  • Webinars

WTW IQ SensorNet  is a modular water quality system for a complete sensor network ideal for various installation needs. The modular system can accept additional sensors easily at any time. This is a powerful system to continuously measure water quality parameters anywhere in a facility for process control.


Immediate benefits include better network visibility and management, early detection of network failures, improved compliance with regulatory targets and cost savings (energy, pump/blower maintenance, labor).

The system is capable of measuring:

  • Dissolved oxygen (optical or electrochemical)
  • pH
  • ORP
  • Conductivity
  • Temperature
  • Turbidity - ultrasonic cleaning
  • TSS (total suspended solids) - ultrasonic cleaning
  • Ammonium
  • Nitrate
  • Potassium
  • Chloride
  • COD (chemical oxygen demand) - ultrasonic cleaning
  • TOC (total organic carbon) - ultrasonic cleaning
  • DOC (dissolved organic carbon share of TOC) - ultrasonic cleaning
  • SAC (spectral absorption coefficient) - ultrasonic cleaning
  • BOD (biochemical oxygen demand) - ultrasonic cleaning

The entire system accommodates up to 20 sensors for the above listed parameters in any combination. Any sensor can also be changed out at any time without re-wiring if another parameter is needed. Simply change sensors (parameters) and start getting data for the new parameter.

The IQ SensorNet terminal has an easy-to-read digital display. The terminal can be kept at a fixed location or easily disconnected and added to a module for a simple mobile terminal solution. You just pull it off its location and move it to the new location without tools and within seconds.

The terminal features include:

  • Centralized power supply along the entire network
  • 2-wire cable provides power and data transfer
  • Easily select relays and analog outputs
  • Digital outputs also available with Profibus or Modbus
  • Optional modem connection via analog or GSM modem
  • Wireless connection via radio transmission
  • Easily add measuring points along the network
  • Multi-functional USB interface with fast data exchange (electronic-key function allows USB stick to function as a key)
  • Programmable access permission
  • LED status update
  • If two terminals are used, the second one would take over automatically if the first one fails or loses power, etc.

The WTW IQ SensorNet will provide continuous data and help improve process efficiency while saving money on energy costs, maintenance, and labor.

Building a system is easy: you will need a terminal(s), module(s), cable(s) and sensor(s). All you need to do is determine which parameters you want to measure and where. After that, the IQ SensorNet takes care of the work.

Specification System 2020 System 2020 System 282 System 284 System 181
Controller MIQ/TC 2020 XT MIQ/MC3 DIQ/S 282 DIQ/S 284 DIQ/S 181
Number of sensors 20 20 2 4 1
Number of parameters 20 20 20 20 1
analog outputs 48 48 up to 18 up to 18 2 x 0(4)…20 mA
3 x relays
USB interface yes yes yes yes
Ethernet interface yes yes yes yes
Field bus connection yes yes yes yes
MIQ modules yes yes yes yes
DIQ modules yes yes yes
Wireless communication yes yes yes yes
Max. total cable length 3000 m 3000 m 250 m 250 m 250 m
Oxygen yes yes yes yes yes
pH/ORP yes yes yes yes yes
Conductivity yes yes yes yes yes
Turbidity yes yes yes yes yes
Suspended solids yes yes yes yes
Nitrogen yes yes yes yes
Carbon yes yes yes yes
SAC yes yes yes yes
Phosphate yes yes yes yes
Sludge level yes yes yes yes

The product range of IQ sensors is one of the most complete product families to monitor wastewater treatment plants in the world. Every parameter has its own sensor with a special measuring procedure. The connection of the sensors always takes place via a SACIQ cable with uniform sensor quick lock, which makes the installation a piece of cake.

Temp Oxy pH/ORP Cond Turb TSS Nit Carb SAC/UVT Sludge Ortho
TriOxmatic® 700 IQ Y Y                  
SensoLyt® 700 IQ Y   Y                
TetraCon® 700 IQ Y     Y              
FDO® 700 IQ Y Y                  
VisoTurb® 700 IQ         Y Y          
ViSolid® 700 IQ           Y          
VARiON® Plus 700 IQ Y           Y        
AmmoLyt®Plus 700 IQ Y           Y        
NitraLyt®Plus 700 IQ Y           Y        
NitraVis® 70X IQ (TS)           Y Y        
NitraVis® 70X IQ NI             Y        
UV 700 IQ NOx             Y        
CarboVis® 70X IQ (TS)           Y   Y Y    
UV 700 IQ SAC                 Y    
NiCaVis® 705 IQ             Y Y Y    
NiCaVis® 70X IQ NI             Y Y Y    
IFL 700 IQ                   Y  
P700 IQ                     Y
Temp Oxy pH/ORP Cond Turb TSS Nit Carb SAC/UVT Sludge Ortho

April 7th, 2017 - Introduction to the World of IQ Sensor Net

WTW Technical Application Specialist, Georg Hatzelmann, introduces us to the powerful IQ Sensor Net system. Georg has over 14 years experience with the IQ SENSOR NET system. His core competence is in international technical support and training for both beginners and specialists - and everyone in between.

45-Minute Webinar Highlights:

  • What is the IQ SENSOR NET and the idea behind it System functions
  • Measurement/Maintenance for O2, pH, turbidity/suspended solids
  • Overview of system sensors and analysers

IQ Sensor Net Webinar Recording  (YouTube)

Webinar Q&A:
Q1: How about analog sensors and analog controllers?
A1: Analog sensors and controllers are not available for the IQ Sensor Net.

Q2: Is there a distance limitation for 20 sensor to connect to model 2020?
A2: The 2020 system has a maximum length of 3km cables with 20 sensors.

Q3: There might be a mix of analog and digital equipments and customer wants to utilize the IQ sensornet system instead of redesigning a PLC / SCADA system.
A3:We can use the IQ Sensor Net system similar to a PLC system and connect mA signals from external devices. If I have a FlowMeter outside you can use a mA signal and feed it to our system, just like a PLC system.

Q4: How about the difference between Visoturb 700 IQ and Visoturb 900-P?
A4:The difference is a completely different design.

Q5:Do we have a limitation for the 284 especially in power consumption? can we connect carbovis, FDO, tetracon and sensolyt at a time?
A5:The limitations depend on how many sensors are on which 284 system.E.g.: DIQ/S 284 EF can handle your example.

Q6:Do you have a model suitable for zone 1/2 area?
A6:At the moment, we don't have one available but we will announce when we have an option.

Q7:If we connect CarboVis 705 IQ TS to DIQ/S 284, can all parameters be displayed?
A7:In the 284 we are only limited to 4 hardware sensors so we can display all parameters of our UV sensors so up to 5 parameters per sensor can be displayed.

Q8:What is the suggested frequency for cleaning of DO sensor manually?
A8:This is dependent on so many factors. It depend on application and mounting, typically 1 - 6 months if it is properly mounted.

Q9: Is it possible to connect the IQ Sensor net to a telemetry system?
A9:If the telemetry system is understood as a PLC system then the answer is yes.

Q10: I know the max lenght of cable is 1 KM. If we need to extend to 3 KM we require abooster - how many boosters can we use? 3 ?
A10:A maximum of 3.

Q11:Is there any HART communication?
A11:No, we have no HART communication

Q12:Can we connect 2020 system directly to a wireless modem (GSM/GPRS modem) for data transfer?
A12:You can connect it to a UMTS router over Network cable

Q13: How we can improve life of pH Sensors and Electrodes?
A13:Simply, frequent maintenance.

Q14:Do you have profibus PA?
A14:We don't have profibus PA but you can use 3rd party converters.

Q15: How frequently do you have to calibrate the sensors?
A15:Dependent on the sensor type. You should calibrate every one or two weeks.

Q16:Do you offer a 2 year warranty on the pH probe?
A16:We have a two year warranty on the armatures, and we have a production error warranty on the electodes but we do not have a life time warranty.

Q17:How do you use the 181 with a IQ Sea Water pH sensor?
A17:We don't have one available.

Q18:It seems the 181 can use on IQF only.

Q19: Do you have compeititor comparison?
A19:Yes, our sales teams can offer this information.

Q20: How offten do we have to replace the DO membrane?
A20:For FDO, the expected lifetime is 3 - 5 years

Q21: Can we use an air cleaning facility with the DIQ/S 181 controller?
A21:Yes you can

Q22: This system is mostly used in municipal, is there any installation based in petrochemical or power plant?
A22:We have some experience with these installations but please contact your local sales representative to ensure that it can be installed in your facility.

Q23:Do you have plan for wireless sensors in the future?
A23:Up to now we have no plans.

Q24:What is the maximum 4-20 mA input that can be connected to the 2020 system?
A24:A maximum of 20 signals if there are no other sensors.

Q25: Do you have an explosion proof model?
A25:Not for the IQ Sensor Net

Q26:Why is there no ultrasonic cleaning for the pH sensor and what is the method used?
A26:Technically this is not possible. Our type of ultrasonic cleaning technology is only applicable for the optical measurement system. The means that the optical window is vibrating and if you keep a pH sensor continuously vibrating, you will destroy it over time.

Q27:How about a connection possibility for the DIQ/S284 with MIQ Modules?
A27:We have some MIQ modules suitable for the 284 systems. Please contact your regional sales represenative for more information.

Q28: Can customers set username and password for IQ web?
A28:Yes, you can.

Q29: Define the housing body of the carbovis sensor - is it made up of peek + titanium?
A29:Correct. All UV sensors have a Titanium and Peek housing body.

Q30:Where is peek material used in the sensor?
A30:In the middle of the sensor on the optical part.

Q31:Can carboVis sensors be used in seawater?
A31:Our algorithem does not work in sea water however our single wave length sensors can be tested.

Q32:Since there is titanium material available which is very robust, is the warranty still the same?
A32:Yes, the warranty is still the same.

Q33: Why dont we make our carboivs sensors full titanium
A33:It is possible with Peek but not with Titanium because the sensor is overly complicated to produce in Titanium.

Q34:Why is there no HART communication provided?
A34:HART is an old communication technology based on the mA hardware. We only use state of the art technologies.

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