VWR OPOX 11-3 Manual De Operación página 10

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English
Test criterion
10
 In the case of persisting dirt you can add some household washing-up liquid
to the tapwater. Attention: Never use any alcohol for cleaning!
3.3.2 Interior cleaning of sensor cap and sensor head
If moisture or dirt have penetrated under the sensor cap, e.g. because the
sensor cap is damaged, you can make the sensor ready for operation again as
follows:
CAUTION
Only use nonabrasive, alcohol-free detergents, as otherwise the optical
surfaces could be damaged.
1. Remove the sensor cap (see section 3.2).
2. Clean the sensor head and sensor cap:
– Rinse all inner surfaces with tapwater
– Remove contamination containing fat and oil with warm water and
household washing-up liquid
– Then rinse all inner surfaces with deionized water
3. Pat dry all surfaces with a clean, lint free cloth.
4. Allow the sensor and sensor cap to dry completely at a dry location
so moisture can evaporate even from corners difficult to access.
When doing, so protect the inside of the sensor cap from light.
5. Put the sensor cap on (see section 3.2).
Note
If the sensor cap is visibly damaged it has to be replaced.
3.4 Checking the zero point of the sensor
There are two methods to check the zero point of the sensor:
 Measurement in a nitrogen atmosphere (recommended method)
 Measurement in a sodium sulfite solution according to DIN EN 25814/
ISO 5814.
The sensor is OK if the measuring instrument displays < 0.5 % D.O. saturation
after 15 minutes.
OPOX 11-3
ba77078d03 05/2021