In order to ensure the spatial flexibility of the stations, they were constructed as trailers with one or two axes (mobile containers). The water is constantly pumped into the so-called sample basin within the trailer by a submersible pump in the river. The overflowing water is drained back into the river by an outlet on the opposite side. The measuring probes for oxygen, water-temperature, pH value, conductivity, turbidity and redox potential as well as the sampling units for the online photometers for the determination of ammonia, TOC, ortho-phosphate, total phosphorous and chlorophyll are installed in the sample basin.
All measuring results are stored in a data logger every five minutes and can be transmitted via modem.