Endress+Hauser Memosens COS81D, Руководство по эксплуатации, Страница: 10 / 48

Device description, function Memosens COS81D
10 Hauser
3.4 Spot cap
The oxygen dissolved in the medium is diffused to the fluorescence layer of the spot cap. A
suitable flow is not required, as no oxygen is consumed during measurement. However,
flow improves the speed at which the measuring system reacts and ensures a more
representative measured value compared to a measurement in a static medium.
The spot is permeable for dissolved gases only. Other substances dissolved in the liquid
phase, such as ionic substances, will not penetrate through the membrane. Therefore,
medium conductivity has no impact on the measuring signal.
3.5 Stabilization time
The measuring method used by the sensor is temperature-dependent. For this reason, the
temperature of the sensor must be adapted to the medium temperature during
commissioning. You obtain reliable measured values once a stable temperature value is
reached.
The temperature usually adapts very quickly in aqueous media. Temperature adaptation
can take several minutes in gaseous media.