Maximizing Optical Sensor Life In Brewing Processes

This application note describes a solution to increase the lifetime of luminescent dissolved oxygen (LDO) spots in-line when cleaning-inplace (CIP) is used with strong oxidants, bleaching agents, or harsh conditions. It is possible to maximize the life of the sensor by taking care of the LDO spot during a non-production process phase.

How Does the LDO Sensor Work? The LDO spot is based on its capacity to have its luminescent molecules excited by light. To react to this status, the dye will re-emit light (see Figure 1a).

Measurement is based on the light emission characteristics of the luminescent reaction. In the presence of oxygen, the luminescence is quantitatively reduced or quenched. Dissolved oxygen (DO) concentration is inversely proportional to the luminescent lifetime of the light emitted by the photo luminescence process (see figure 1b).