The invention relates to a system for detecting one or more analytes in a sample. The system comprises a probe for insertion into the sample, the probe having a first electrochemical sensor configured to detect a first analyte in the sample, and a second electrochemical sensor configured to detect a second analyte in the sample. A first potentiostat is connected to the first electrochemical sensor and configured to perform a first electrochemical measurement with the first electrochemical sensor. Additionally, a second potentiostat is connected to the second electrochemical sensor and configured to perform a second electrochemical measurement with the second electrochemical sensor. The first potentiostat and the second potentiostat are electrically isolated from one another.