Endress+Hauser OxyMax W COS 71, Operating Instructions Manual

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5 Commissioning OxyMax W COS 71
14 Hauser
5 Commissioning
5.1 Function check
Before the first commissioning, make sure of the following points:
•
That the sensor was correctly installed (Post-installation check, see Chapter 3.5)
•
That the electrical connection is correct (Post-connection check, see Chapter 4.3)
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Warning!
Danger of medium escaping.
Before applying compressed air to the assembly, make sure the connections of the
cleaning facility are correctly fitted. Otherwise, the assembly may
not be used.
5.2 Polarisation
The sensor was tested in the factory for perfect functionality and is supplied ready for
operation.
To prepare for calibration, proceed as follows:
•
Remove the sensor protective cap.
•
Place the externally dry sensor in atmospheric air.
The air should be saturated with water vapour. Therefore, install the sensor as close
to the water surface as possible. When calibrating the sensor membrane, make sure
the membrane remains dry.
Therefore, avoid any direct contact with the water surface.
•
Connect the sensor to the transmitter and switch on the transmitter.
The polarisation is automatically proceeded. Within the first 30 seconds the sensor
builds up an analogue or a digital transmission protocol depending on the used
transmitter. During this time all displayed measuring values are 0. Having built-up the
transmission protocol, a measuring value can be displayed.
•
The polarisation time takes about 1 hour.
Polarisation starts high, then drops gradually. You will recognise the end of polarisation
when the display stabilises and remains practically constant.
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Caution!
When you remove the sensor from the medium, protect the sensor from strong sunlight.
Make sure you comply with the instructions for comissioning and calibration in the
Operating Instructions of the transmitter.