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Mounting the
sensor cap
Sealing
ring
6.
Check the front surface of the sensor for absolute cleanness and
clean it if necessary (
chapter 3.3.2).
7.
Thoroughly clean the thread of the protective hood.
8.
Check the sealing ring for intactness and correct position. The sealing
ring has to be replaced if it is damaged.
9.
Aim the sensor head upwards and place the new sensor cap on the
sensor. The locking device on the sensor head must be inserted into
the receptacle on the inside of the sensor cap (see figure on the left).
10.
Put the protective hood on the sensor head and screw it tight by hand
as far as it will go. A gap of approx. 0.8 mm remains between the
protective hood and sensor.
The sensor is immediately ready to measure.
Cleaning
3.3
3.3.1
Cleaning the sensor
Dirt on the sensor can affect the measuring characteristics. Biological deposits for example, consume oxygen
and can, when occurring on the sensor membrane, impair the responding behavior and cause values that are
too low. Therefore, we recommend regular visual inspections and exterior cleaning as necessary.
Pay attention to the following points for cleaning:
First, thoroughly rinse the sensor with tapwater to remove loosely adhering dirt.
Rough dirt on the sensor shaft can be brushed off with a soft brush.
Attention: Do not use the brush in the area of the sensor membrane. Risk of damage!
The sensor cap including the sensor membrane should be wiped with a soft and moist microfiber cloth.
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
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:
NOTE
Only use nonabrasive, alcohol-free detergents, as otherwise the optical surfaces could be damaged.
1.
Remove the sensor cap (
chapter 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 (
chapter 3.2).
If the sensor cap is visibly damaged it has to be replaced.