A sensor of the type for liquid and/or gas analysis, which is connected to a measuring and/or evaluating system or, respectively, to a higher-ranking control system and has a sensor housing. The circuit for the collecting, processing and transmitting measured values to the measuring and/or evaluating system or to the control system (19) are provided in the sensor housing (2). This circuit has analog sensor electronics (3), an analog-digital converter (14) for converting the detected analog measured values into digital measured values, a processing unit (15) and communication device (17) for processing and transmitting the digital measured values to the measuring and/or evaluating system or to the control system (19) according to a standard communication protocol of process technology.