Endress+Hauser Oxymax COS61D, Operating Instructions Manual

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Maintenance Oxymax COS61D
28 Hauser
reaches a specific value. The sensor is still able to measure at this stage. However, it is
advisable to change the cap as quickly as possible.
Removing the old fluorescence cap
1. Activate the hold function at the transmitter.
2. Remove the sensor from the medium.
3. Unscrew the protection guard or cleaning unit.
4. Clean the exterior of the sensor.
5. Unscrew fluorescence cap.
6. Clean and dry optical surface.
Installing the new fluorescence cap
Make sure that there are no dirt particles on the sealing surfaces.
7. Carefully screw the new fluorescence cap onto the sensor head and tighten until the
stop.
 After replacing the fluorescence cap, recalibrate and adjust the sensor.
8. Screw the protection guard or cleaning unit back on.
9. Then place the sensor back into the medium and check that no alarm is displayed on
the transmitter.
10. Deactivate the hold function at the transmitter.
10.6 Checking the measurement function
1. Remove the sensor from the medium.
2. Clean and dry the fluorescence cap.
3. After about 10 minutes, measure the oxygen saturation index in air (without
recalibration).
 The measured value should be at 100 ± 2 % SAT.