Endress+Hauser Oxymax COS22D, Руководство по эксплуатации

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Oxymax COS22D Function
Hauser
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5.1.3 Memosens technology
The sensor is connected to the cable connection (CYK10) without contact. The power and data are
transferred inductively
Once connected to the transmitter, the data saved in the sensor are read digitally. You can call up these
data using the corresponding DIAG menu.
Data that digital sensors save include the following:
• Manufacturer data
– Serial number
– Order code
– Date of manufacture
• Calibration data
– Calibration date
– Calibration values
– Number of calibrations
– Serial number of the transmitter used to perform the last calibration
• Operational data
– Date of commissioning
– Hours of operation under extreme conditions
– Number of sterilizations
– Data for sensor monitoring.
5.1.4 Polarization
When the sensor is connected to the transmitter, a fixed external voltage is applied between the cathode
and anode. The resulting polarization current is indicated on the display of the transmitter. The current
starts high but then drops over time. The sensor can only be calibrated when the display is stable.
Reference value for practically complete polarization of a sensor that was in storage for an extended
period beforehand:
• COS22D-*1: 2 hours
• COS22D-*3: 12 hours
After this time, measurements close to the determination limit make sense.
The polarization time needed is shorter for sensors which were in operation shortly beforehand.
5.1.5 Membrane body
The oxygen dissolved in the medium is conveyed to the membrane by the incoming flow. The
membrane is only permeable for dissolved gases. Other substances dissolved in the liquid phase e.g.
ionic substances, will not penetrate through the membrane. Therefore, medium conductivity has no
impact on the measuring signal.
The sensor is supplied with a standard membrane body which can be used for all common applications.
The membrane is pretensioned at the factory and can be installed directly.
Electrolytes are version-specific and cannot be mixed in a single application!