WTW, a Xylem company, is a manufacturer of portable systems for environmental measurements.

WTW’s line up includes the waterproof (IP 67) Multi Line® 3410, 3420 and 3430 handheld meters for either one, two or three parameters at the user’s choice and a range of Intelligent Digital Sensors (IDS) for pH, conductivity and dissolved oxygen measurement. The pH sensors and conductivity cells are based on WTW`s proven SenTix and TetraCon models, whereas the FDO® 925 optical D.O. sensor is an entirely new development.

These unique sensors convert the analogue measuring signal into a digital one before transmitting it to the meter. The digital signal is insusceptible to interference and hence allows the user to use cable lengths of up to 100 m even with pH sensors. In addition, particularly thin and supple cables can be used. Each IDS sensor stores a set of individual data (e.g. serial no. and, most important, its calibration record) for documentation purposes and thus minimising potential error sources and allowing to exchange the sensors between different meters at any time.

A true highlight are the new plug head versions of the IDS sensors that can be clipped to cables of different lengths at the user’s choice. They can be connected not only to the MultiLine® series of handheld meters, but also to the extraordinary new MPP 910 IDS and MPP 930 IDS depth sondes. Last but not least they can be used with the inoLab® 9310, 9420 and 9430 laboratory instruments, too. No other system provides such a flexibility.