WTW - a xylem brand

Offers robust analysis products for the measurement of pH, dissolved oxygen, conductivity, total dissolved solids and specific ions in lab, field and on-line applications serving the environmental, water and wastewater, food and beverage, educational, pharmaceutical, clinical, research and chemical/petrochemical industries.


  • Products

WTW IQ SensorNet 181

The new system 181 – the digital and cost-efficient single parameter measuring point with proven IQ Sensor Net technology and matching fixed cable sensors
  • Low-cost alternative to analog measuring points
  • Matching digital IQ fixed cable sensors for pH/ORP, conductivity, O2 and turbidity
  • Stable, robust and proven measuring technology

MCERTS certified


WTW IQ SensorNet 182

The largest among the small ones – monitor for the connection of up to 4 digital IQ sensors – with 5 power outputs, 6 relays and digital outputs
  • up to 4 digital IQ sensors can be connected
  • Analogue version with up to 5 power outputs and 6 relays
  • Digital outputs PROFIBUS or MODBUS RTU available as options

MCERTS certified

Our latest instrument, the WTW 282 has superseeded this product.  Click here for the lastet information

Alt: WTW photoLab® 7600 UV-VIS

WTW photoLab® 7000 Series Spectrophotometer

The spectrophotometer photoLab® 7600 UV-VIS combine routine analysis with spectral analysis and pioneering procedure OptRF
  • Menu-guided operation
  • Opt-RF, Optical Reagent-Free measurement, for COD, NO3, NO2 in municipal wastewater final effluent
  • Multi-layer AQA
  • Application support
  • Comprehensive programming opportunities
  • Colour Applications

WTW IQ Sensor Net

Online Mutli-parameter measurement system

The IQ SENSOR NET - the measuring system for wastewater treatment plants and industrial applications.


WTW IQ SensorNet 282

DIQ/S 282/284 – our system for small and middle-sized wastewater treatment plants

Controller for small and mid-sized wastewater treatment plants including USB-interface and internal data logger – up to 4 sensors, all parameters, available anytime.

  • All parameters available (O2, NH4, NO3, COD, PO4, sludge level)
  • USB-interface and internal data logger by default
  • Convenient and available anytime via Ethernet-interface
2020 3G family

WTW IQ SensorNet 2020 3G Controller

Improve Operational Efficiency with Continuous Data

With an easily scalable solution, the 2020 3G allows for the connection of up to 20 sensors. This modular plug-and-play system allows you to monitor the water quality in your wastewater system continuously and accurately.

MCERTS certified.

WTW CarboVis Spectral Sensors

WTW CarboVis Spectral Sensors

Chemical-free measurement of COD / TOC / DOC / BOD / SAC / UVT directly in the process.

The chemical-free spectral measurement allows a precise determination of the COD and nitrate level.
Whether influent, biological tank or effluent, the self-cleaning sensors CarboVis provides:

  • High measurement reliability
  • Low operating costs
  • Simple handling
  • Maximum durability

WTW FDO Online Dissolved Oxygen Sensor

Water/Wastewater Treatment, Water Pollution Control, Fish farming/Aquaculture

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



SAC & UVT measurement: Without servicing - Without wiper

The SAC sensor measures Spectral Absorption Coefficient (SAC) and UV transmission (UVT) at 254nm for determination of organic loads in water. With the  sensor UV 700 IQ SAC this parameter can be detected directly without any chemicals. A reference measurement is performed for compensation of turbidity influences.

WTW VisoTurb®

WTW VisoTurb® 700 IQ & ViSolid® 700 IQ Sensors

WTW VisoTurb® 700 IQ & ViSolid® 700 IQ Sensors

With the VisoTurb® 700 IQ and ViSolid® 700 IQ sensors, WTW presents a family of optical sensors for turbidity and suspended solids measurement. These sensors incorporate a ultrasound cleaning system that guarantees low maintenance and long-term reliability of the sensors. Turbidity measurements in aqueous media with VisoTurb® are carried out nephelometrically in compliance with EN ISO 7027. Solid matter measurement with ViSolid® is performed according to the principle of scattered light measurement.

SensoLyt® pH/ORP sensors

WTW SensoLyt® pH / ORP Sensors

For continuous pH/ORP measurement, especially under difficult conditions

For continuous pH/ORP measurement, especially under the difficult conditions very often found in sewage treatment facilities, very high demands are made concerning the reliability and operating safety of the systems employed.

WTW inoLab® Multi 9430 IDS

WTW inoLab® Laboratory Multi-parameter Benchtop Meters

inoLab® Multi 9430 IDS, 9420 IDS and 9310 IDS

Application oriented benchtop sets for multiple parameter monitoring: pH, mV, ISE, saturation, concentration, partial pressure, conductivity, special resistance, salinity, TDS, temperature

Cutting edge technology from WTW for demanding laboratory applications. Two digital inoLab® multi-parameter instruments for IDS sensors for parallel measuring of one identical or varying parameters. Up to three sensors (inoLab® Multi 9430 IDS) can be connected. A large glass shield protects the graphic display and supports the presentation of the measuring values and recognition of important information. The innovative and antibacterial keypad helps to protect against microbiological contamination. The solid zinc die-casting lower case gives the meters a safe standing and also protection from the environment. As a special feature, both models can be upgraded with an additional module for conventional pH measurement.

WTW Inolab 9430

WTW inoLab® pH Benchtop Meters

Precise pH measurement for all lab applications - inoLab® pH 7110, inoLab® pH 7310

The inoLab® family: Advanced measuring technology offers new functions including automatic AutoRead or CMC (Continuous Measurement Control) making measurements more convenient and reliable than ever.
The user interface, large display and keypad with tactile feedback provide an exceptional user experience and error-free operation.
All benchtop meters are available in application oriented sets including sensors and accessories.


WTW BOD self check measurement OxiTop®

Respirometric OxiTop® systems allow the measurement of BOD, Biodegradability, Soil respiration, Biogas production, Anaerobic processes, and Microbiological Activity, according to official EPA, EN, DIN, ISO and OECD methodologies.

OxiTop® systems for BOD or other depletion / respiration applications

  • Complete packages ready to use
  • Simple, flexible, secure, compliant, customisable and scalable
  • Mercury-free pressure measurement
WTW MultiLine® IDS

WTW MultiLine® IDS

Handheld multi-parameter measurement systems with intelligent, digital sensors for pH, dissolved oxygen (DO) and conductivity measurement

The new multi-parameter systems with intelligent, digital sensors for pH, dissolved oxygen (DO) and conductivity measurement revolutionize multi-parameter measurement:
The signal processing is completely located in the sensor, and the measuring signal is transmitted to the meter without interference and in a clearly identifiable manner via thin, highstrength cables. A wide range of sensors are available for virtually every application.


WTW MPP IDS – Multi-parameter Depth Sondes within IDS System

MPP 910 IDS + MPP 930 IDS

Up-to-date digital depth measurement with the WTW IDS system: A built-in barometric pressure and temperature compensated depth sensor combines dissolved oxygen, pH or ORP and conductivity measurements with accurate depth readings.

WTW 9310

WTW inoLab® IDS - Benchtop

Single channel benchtop multiparameter instrument

Connect digital IDS sensors to the Inolab for the measurement of pH, ORP, conductivity, and DO/BOD.

  • Uncompromised measuring accuracy
  • Digital sensor recognition
  • Smart sensor evaluation
WTW Inolab pH/Ion 7320

WTW InoLab® pH/Ion 7320

Laboratory Instrument for pH, mV (ORP), and Ion Activity Measurement

Precise pH/ISE benchtop meter with enhanced ISE methods for concentration measurement with ion selective electrodes

  • Simultaneous measurements of pH, ion concentration or ORP
  • Flexible and convenient data transfer
  • Visualization of the optimum measuring range supports correct measurements (CMC function)

WTW P700 Orthophosphate Analyser

The optimum solution to support phosphate elimination as well as monitor phosphate freight - on-site analyzer for orthophosphate measurement in the IQ Sensor Net

WTW Varion sensor

WTW VARiON Plus 700 IQ

The VARiON probe is used within the IQ SensorNet system.

The VARiON probe is used within the IQ SensorNet system and can therefore be networked with other probes and parameters for a complete process monitoring and control system. It can measure, report and control off of the ammonium and/or nitrate measurements with automatic compensation for potassium (for ammonium) or chloride (for nitrate).


WTW 700 IQ IFL Sensor

The IFL is an ultrasonic, interface level measurement sensor for the IQ SensorNet system.

The IFL is an ultrasonic, interface level measurement sensor for the IQ SensorNet system. During the wastewater treatment process, the measurement of the interface level between liquids is of vital importance for optimal performance and trouble-free operation. The 700 IQ IFL provides continuous data to help operational efficiency improvement decisions. Simply connect it to the IQ SensorNet system.


WTW Portable colorimeter pHotoFlex® STD

pHotoFlex STD: portable LED photometer for environmental monitoring and extensive water and routine analytics in (mobile) service labs including colorimetry methods in food and beverage and other industrial applications

  • Intuitive and easy operation
  • Captive adapter for two cuvette sizes
  • Robust and waterproof


P200 UV254 Portable Meter

Portable UVT254 meter for QC and calibration of online UVT instruments

Portable UVT254 meter for QC and calibration of online UVT instruments