The Next Generation of Spectral Sensors for Accuracy and Repeatability

WTW (USA), a Xylem brand, has announced the launch of the next generation of spectral sensors at IFAT ENTSORGA 2012. The new CarboVis, NitraVis and NiCaVis sensors offer precise and reliable online measurement of parameters including nitrate, chemical oxygen demand (COD), biochemical oxygen demand (BOD), total organic carbon (TOC) and total suspended solids (TSS).

Able to carry out fast measurements across an extensive range of parameters, the spectral sensors incorporate a new optical design to guarantee the highest levels of accuracy, whilst ensuring repeatability and stability of the optical system. The drift-free sensors guarantee reliable data over extended periods of time, without the need for routine maintenance. To further ensure optimum performance, the sensors use a full UV-VIS spectral wave length range from 200-720 nm to provide the best measurement results and to compensate for disturbing influences such as turbidity.

In many optical systems, contamination from turbidity and suspended solids can cause errors. Furthermore, once contamination of the optical system has begun, additional build-up of particles progresses at an accelerated rate. The new WTW spectral sensors overcome this challenge by featuring an integrated ultrasonic cleaning system that generates high-frequency vibrations of the optical windows. This prevents accumulation of any contaminants, ensuring low maintenance and reliable measurements for continuous operation. In addition, the sensors have been developed using high-tech materials including titanium and polyether ether ketone (PEEK) to withstand harsh conditions for extreme durability over the entire lifespan of the sensor.