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Xylem (NYSE: XYL) is a leading global water technology provider, enabling customers to transport, treat, test and efficiently use water in public utility, residential and commercial building services, industrial and agricultural settings. The company does business in more than 150 countries through a number of market-leading product brands, and its people bring broad applications expertise with a strong focus on finding local solutions to the world’s most challenging water and wastewater problems. Xylem is headquartered in White Plains, N.Y., with 2012 annual revenues of $3.8 billion and 12,900 employees worldwide. In 2012, Xylem was named to the Dow Jones Sustainability World Index for advancing sustainable business practices and solutions worldwide.

The name Xylem is derived from classical Greek and is the tissue that transports water in plants, highlighting the engineering efficiency of our water-centric business by linking it with the best water transportation of all — that which occurs in nature. For more information, please visit us at

About us

Since 2011, WTW is a company of the Xylem Group, which operates worldwide in its core business of water. Xylem has set a goal to contribute to the improvement of water management with innovative solutions and technologies in the world.

Ulrich Schwab, WTW managing director since May 2012

This global corporate goal offers us at WTW an excellent base to use our expertise and experiences as entrepreneurs and socially in solving the global water problem: Through ongoing developments and improvements of our proven sensor and analysis technology, we want to make an important contribution to safeguarding water quality for future generations - a claim that inspires us and fills us with joy and pride.

If you want to learn more about Xylem:

Laboratory & Field Instrumentation

The product range from WTW offers the world’s most complete line of

  • pH/ORP
  • D.O.
  • BOD
  • Respirometry
  • Conductivity Instruments
  • Turbidity Meters and
  • Photometers including reagents.

WTW systems range from rugged waterproof, portable field meters to an integrated line of laboratory instruments and accessories, as well as completely new multiparameter instruments with state-of-the-art technology for lab and field applications.

Online Instrumentation

For many years, the IQ SENSOR NET has set the standard for online measuring technology. It is suitable for conventional instrumentation with analog outputs as well as for field bus instrumentation. The innovative digital sensors in this system represent the state of the art in process measuring.

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.

The dependability, reliability, and versatility of WTW measurement systems and analyzers have established WTW products as industry standards world-wide.


WTW has built a solid reputation in its more than 60 year history by providing “best in class” products with unparalleled customer and technical support. WTW strives to deliver solutions to our customers measuring problems.

Our Customer Care Centers are dedicated to ensuring each customer’s individual success. WTW’s extensive applications library, coupled with knowledgeable applications specialists, provide for rapid resolutions to technical challenges.

With support facilities around the globe, the WTW manufacturing center, located just south of Munich, Germany, delivers quality technical instrumentation with continuous support. We are proud to present our product offering to you and look forward to serving your needs. “Made in Germany”.

Company highlights

1945 Company founded by Dr. Karl E. Slevogt
1948 Renamed to Wissenschaftlich-Technische-Werkstätten (WTW)
1954 Introduction of first WTW pH meter
1965 Introduction of first WTW dissolved oxygen meter
1976 Bavarian State Award for the Combibox compact
multi-parameter system
1982 Introduction of the world’s first zero-current-free (stable zero point) dissolved oxygen sensor for field measurements
1983 Start of WTW’s online measuring technology program
1986 First company to offer a 3-electrode dissolved oxygen
sensor (TriOxmatic®) with automatic calibration
on air (OxiCal®)
1987 First company to offer a 4-electrode conductivity sensor (TetraCon®) for portable water analysis
1993 First manufacturer of D.O., pH and conductivity measuring systems to be certified to ISO 9001
1995 • Introduction of the mercury-free OxiTop® system for manometric BOD determination
• First company to offer monitors with built-in lightning protection
1997 New photoLab®-laboratory photometers combine precision with outstanding ease of use
1998 • I ntroduction of the PurCon® sample preparation system as a replacement for conventional filtration systems
• First WTW spectrophotometer
1999 The new laboratory instruments of the inoLab® family set new standards for the measurement of pH, D.O., conductivity, ISE and temperature
2000 Introduction of TresCon® – the modular analytical system for the continuous measurement of ammonium, nitrite, nitrate, phosphate
2001 IQ SENSOR NET – the multi-parameter measuring system offers unlimited possibilities for online measurements
• The new VisoTurb® and ViSolid® turbidity
and solid sensors with their revolutionary ultrasonic keeping clean system give “low-maintenance” a completely new meaning
2002 AmmoLyt® 700 IQ enables reliable Online direct measurement of Ammonium
PurCon® IS: Sample Preparation – directly
without pump
2003 NitraLyt® 700 IQ is a perfect supplementary nutrient parameter (Nitrate) for Online direct measurement
2004 • Multi-parameter portable meter Multi 350i represents state-of-the-art technology in field applications
NitraVis®, CarboVis® and NiCaVis® – spectral
“in-situ” Online sensors for Nitrate, Carbon and TSS measurement for wastewater control
2005 • Portable photometers and turbidity meters for
universal applications:
pHotoFlex®/pHotoFlex® Turb
Turb 430 IR

IQ SENSOR NET System 182 compact 2 channel transmitter
2006 VARiON® ammonium and nitrate multisensor with automatic compensation of interference ions
2007 • The new optical D.O. sensor FDO® 700 IQ completes the WTW portfolio for online D.O. measuring
• The new spectrophotometers of the photoLab® 6000 series combine systematic and spectral analysis with well proven quality assurance AQA.
2008 The IQ SENSOR NET system keeps on developing:
• New terminal/controller T 2020 XT with USB and dual-processor function
System 182 XT-4: perfect for up to 4 sensors
IQ-LabLink joins online measuring with laboratory calibration
2009 The new ProfiLine single parameter portable meters feature extreme robustness and outstanding ease of use
2010 MultiLine® IDS – new digital world of portable measurement:
MultiLine® – digital multi-parameter portable meters and
FDO® 925 – optical dissolved oxygen sensor for field and lab
2011 inoLab® Multi IDS - IDS technology for the lab
2012 • UV-VIS sensors - Next generation of CarboVis® , NitraVis® und NICaVis® sensors with the optical design, integrated ultrasonic cleaning technology and high-tech materials
IFL 700 IQ sensor - interface level measurement for sludge management