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 BOD Measurements / Respiration

Measurement of biochemical oxygen demand (BOD) and respiration/depletion.
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

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

WTW Inolab 9430

WTW inoLab® pH Benchtop Meters

Precise pH measurement for all lab applications.- inoLab® Multi 9310 IDS, 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®

WTW OxiTop® BOD self check measurement

Measuring heads for respiration/biogas determination

WTW OxiTop® systems are easy-to-use meters for BOD for self-monitoring. OxiTop®-C measuring systems can execute anaerobic and aerobic examinations across the entire spectrum of biodegradability and evaluate them on the computer

WTW photoLab® 7600 UV-VIS

WTW photoLab® 7100 (VIS) & PhotoLab 7600 (UV/VIS) Spectrophotometers

Combine routine analysis with spectral analysis and pioneering procedure OptRF

The spectrophotometers photoLab® 7100 VIS and photoLab® 7600 UV-VIS combine routine analysis with spectral analysis and pioneering procedure OptRF.
The new reference beam optics together with a new brilliant colour display turn hard work into fun: clearly-arranged, color-coded, fast and comfortable.


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 IQ Online Monitoring System

The ideal modular online measuring system for small, medium and large wastewater treatment systems

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.

WTW 2020 XT

WTW IQ SensorNet 2020 XT Controller

Improve Operational Efficiency with Continuous Data

With an easily scalable solution, the 2020 XT 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.

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


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.

Online D.O. Measurement

WTW Online Dissolved Oxygen (DO) Measurement

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

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

WTW MultiLine® IDS

WTW MultiLine® IDS – Multi-parameter Measurement

Multi-parameter 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 FDO 700 Digital IQ Sensors for Dissolved Oxygen

Online digital IQ sensor for connection to the IQ Sensor Net

Calibration-free, reliable, DIN compliant - the optical FDO® oxygen sensors for the IQ Sensor Net to regulate biological cleaning steps

  • Calibration and flow free
  • Insensitive to air bubbles
  • Low usage costs
WTW P700 Orthophosphate Analyser

WTW P 700 Orthophosphate Analyser

Phosphate elimination analyser - easy to integrate in new or existing IQ systems.

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 IQ Sensor Net DIQ/S 282/284 Controller

WTW IQ Sensor Net DIQ/S 282/284 Controller

Controller for small and mid-sized wastewater treatment plants

The new WTW DIQ/S 282/284 (2 and 4 channel) controller replaces the DIQ/S 182 from June 2016
The new controller is for small and mid-sized wastewater treatment plants and includes a USB-interface with an internal data logger - up to 4 sensors can be connected and 20 parameters measured siumultaneously.

WTW IQ SensorNet 181 Digital Controller

WTW IQ SensorNet 181 Digital Controller

Digital controller DIQ/S 181 for pH,dissolved oxygen, turbidity or conductivity

The WTW IQ SensorNet 181 – the digital and cost-efficient single parameter measuring point with proven IQ Sensor Net technology and matching fixed cable sensors

WTW Turb 430 IR / Turb 430 T

WTW Turb 430 IR / Turb 430 T Turbidity Meter

Portable nephelometric with highest precision according to DIN ISO / US EPA for water analytics, quality control and process monitoring

The turbidity meters Turb® 430 IR acc. to DIN ISO 27027 and Turb® 430 T acc. to US EPA 180.1 meet the requirements of the nephelometric measurement at 90° stray light for drinking water with highest precision, especially in the range < 1 NTU. The measuring range comprises 0-1100 NTU/FNU with automatic measuring range switching and is therefore suitable for water analysis as well as quality control, such as gasoline, cell cultures, as well as in the food and beverage industries.

WTW Portable colorimeter pHotoFlex STD

WTW Portable colorimeter pHotoFlex STD

pHotoFlex® STD: portable LED photometer for environmental monitoring and extensive water and routine analytics in (mobile) service labs

The portable pHotoFlex® STD with energy-efficient LED optics is equipped with 6 wavelengths and a foldable adapter for various applications with 16 mm and 28 mm cuvettes, for even the smallest concentrations. With more than 180 programs for standard parameters and coloration as well as a multitude of test kits - from lot-certified cuvettes to economic powder reagents, it is suitable for monitoring by health offices via environmental monitoring all the way to service labs.

WTW Alyza IQ analyzer PO4

WTW IQ Sensor Net Alyza Analyzer PO4

Orthophosphate analyzer for the WTW IQ SENSOR NET

Meet Alyza! The perfect solution to support phosphate elimination as well as phosphate load monitoring - on-site analyzer for orthophosphate measurement in the IQ SENSOR NET

WTW IQ SensorNet Alyza Analyzer NH4

WTW IQ SensorNet Alyza Analyzer NH4

IQ SensorNet Analyzer for Ammonium provides accurate, reliable measurements for process control

The IQ Analyzer features a revolutionary MultiValve that dramatically reduces reagent use and maintenance requirements.