Case: Measurement of pH values and oxygen level
A customer contacted us when he wanted a pH measurement in a rainwater sewer, as too high pH values can be harmful to the ecosystem in the river, in which the sewer flows in to. In addition, he wanted a general picture of the river’s health condition in the form of a measurement of the oxygen level.
Since the measurement is temporary and the sewer is located in the middle of a road, it quickly became clear that the measuring equipment had to be mobile.
We chose to use our self-developed data logger D-Log M, due to its long battery life (when logging every 5 minutes – about a year of battery life), flexible programming options and stable logging frequency.
In addition, we used the Liquiline CM82 transmitter from Endress + Hauser. It has the advantage that a wide range of different sensors can be connected, such as pH, ORP, conductivity, oxygen and chlorine sensors.
It was the Digital pH Orbisint CPS11D sensor (also from E + H), we chose to use for the task. A sensor that turned out to live up to the task.
To measure the oxygen level in the sewer outlet, we used the sensor Oxymax COS22D (E + H).
The customer received some very accurate measurement data on the pH values in the sewer and the oxygen level in the river, and thus got a good overview of its health condition.