A customer contacted us when he wanted to get a pH measurement in a rainwater sewer, as too high pH values can be detrimental to the ecosystem of the lake in which the sewer is discharged in. Furthermore he wanted a measurement of the oxygen level, in order to get a general overview of the condition of the lake.
As the measurement was temporary and the sewer was located in the middle of a road, it soon became clear that the measuring equipment had to be mobile. We choose our own developed data logger D-Log M, due to its long battery life (when logging every 5 minutes – the battery life lasts about one year), flexible programming options and stable logging frequency. In addition, we used Liquiline CM82 transmitter from Endress + Hauser. It has the advantage of being able to connect a wide variety of sensors, such as pH, ORP, conductivity, oxygen and chlorine sensors. To this particular task, we choose Digital pH Orbisint CPS11D sensor (also from E + H) A sensor that, turned out to live up to the task. To measure the oxygen level in the sewer outlet, we used the Oxymax COS22D (E + H) sensor. The customer got some very accurate measurement data of the pH values in the sewer, the oxygen level in the lake, and thus a good overview of the condition of the lake.