A sensor module includes a sensor element with a transducer for emitting an electric analog primary signal, which depends on a measured value; and a circuit assembly for conditioning the primary signal and for unidirectional data communication of a digital signal, which depends on the primary signal, to a superordinated unit. The circuit assembly has the following components: a signal input for receiving the primary signal, which depends on the measured value; a secondary side, inductively coupling, plug connector element for connection to a primary side, inductively coupling, plug connector element of the superordinated unit for receiving an energy signal and for transferring a measurement signal; an energy supply circuit, which rectifies the energy signal and provides at least one direct voltage for supplying the sensor module components; an analog signal conditioning circuit for conditioning the primary signal to a secondary signal; an analog-digital converter for converting the secondary signal to a digital measurement signal; a modulator for modulating the received energy signal for transferring the measurement signal to a superordinated unit by means of load modulation; and a microcontroller for controlling the components of the circuit assembly.

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.

Systems and methods for measuring pH of a drilling fluid in a downhole drilling environment are disclosed. The system includes wireless pH sensing devices dispersed in the drilling fluid and circulated through a borehole. The wireless pH sensing devices include a capsule shell for protecting internal electronics from harsh downhole conditions. The electronics include an electrolyte insulator semiconductor field-effect (EIS) pH sensor structure, a controller, RF communications unit and power supply. The pH sensing devices periodically measure the pH of the fluid while circulating through the borehole. Upon return of the sensors above ground, the pH measurements are wirelessly provided to a monitoring computer, prior to recirculating the sensors through the borehole.