background image

Maintenance

Oxymax H COS21

8

Hauser

4.

Switch-on the transmitter.
If you connect the sensor to the transmitter, polarization is automatically performed after 
switching on the transmitter.

5.

Wait for the polarization time to end.

"

Caution! 
• When you remove the sensor from the medium,  protect the sensor from strong sunlight.
• Make sure you comply with the instructions for commissioning and calibration in the 

Operating Instructions of the transmitter.

4.3

Calibration

Calibrate the sensor (air calibration) immediately after the polarization time has elapsed.

The calibration intervals depend heavily on:
• The application and
• The installation position of the sensor.

The following methods help you determine how long the calibration intervals should be:

1.

Check the sensor one month after its being put into operation by taking it out of the fluid, 
drying it and then measuring the oxygen saturation index at air after 10 minutes.
Decide using the results:

a. If  the  measured  value  is  not  at  102 ± 2 %SAT,  you  have  to  calibrate  the  sensor.

b. Otherwise, double the length of time to the next inspection.

2.

Proceed as per Point 1 after two, four and/or eight months. In this way, you can determine 
the optimum calibration interval for your sensor.

!

Note! 
Be sure to calibrate the sensor at least once a year.

5

Maintenance

Maintenance work must carried out at regular intervals. To ensure that it is carried out, we 
recommend you enter the maintenance dates into an operations logbook or in an 
operations calendar in advance.
The maintenance cycle primarily depends on the system, the installation conditions and the 
medium in which measurement is taking place.

The following activities must be carried out:
• Cleaning the sensor

(In particular when the membrane is soiled)

• Check the measuring function:

1. Remove the sensor from the medium.

Summary of Contents for Oxymax H COS21

Page 1: ...BA244C 07 en 09 06 71032330 Operating Instructions Oxymax H COS21 Dissolved oxygen sensor...

Page 2: ...tified electrician Technical personnel must have read and understood these Operating Instructions and must adhere to them Before commissioning the entire measuring point check all the connections for...

Page 3: ...e contents are undamaged Inform the supplier about damage to the delivery contents Keep the damaged products until the matter has been settled Check that the scope of delivery is complete and agrees w...

Page 4: ...2 2 Mounting location Select the installation location so that there is easy access for later calibration Make sure that upright posts and assemblies are secured safely and vibration free For immerse...

Page 5: ...ll and connect the oxygen sensor Caution Do not install the sensor suspended from the cable Screw the sensor into the assembly so that the cable is not twisted Avoid exerting excessive tensile force o...

Page 6: ...Wiring Warning The electrical connection must only be carried out by a certified electrician Technical personnel must have read and understood the instructions in this manual and must adhere to them...

Page 7: ...eric 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 Th...

Page 8: ...peration by taking it out of the fluid drying it and then measuring the oxygen saturation index at air after 10 minutes Decide using the results a If the measured value is not at 102 2 SAT you have to...

Page 9: ...ing proceed as follows Caution After cleaning rinse the sensor with copious amounts of clean water 5 2 Regenerating the sensor 5 2 1 Replacing the sealing ring Replacing the sealing ring is only neces...

Page 10: ...the membrane cap 4 If necessary clean the cathode or replace the sealing ring if it is damaged 5 Rinse the electrode holder with drinking water Installing the new membrane cap 1 Make sure that there a...

Page 11: ......

Page 12: ...www endress com worldwide BA244C 07 en 09 06 Printed in Germany FM SGML 6 0 DT 71032330...

Reviews: