The light source and the detector are both integrated in the sensor head. The unique ISM (Intelligent Sensor Management) technology is implemented in all optical sensors from METTLER TOLEDO. All system data including calibration and diagnostic information are stored in the sensor.
The METTLER TOLEDO sensors InPro6970i are based on the so call fluorescence quenching. The signal of the fluorescence is compared with a reference signal and the oxygen concentration is calculated from the time shift between these two signals. The oxygen concentration is displayed on the transmitter.