VWR DO220 Manuel D'instructions page 17

The replacement O\DO sensor cap is shipped in a humidified container.
The package should not be opened until ready for use. Once the sensor
cap has been installed on the sensor as described below, it is important
to keep the sensor in a 100% humid environment. Therefore, the sensor
should be stored in either the gray calibration/storage sleeve with a
moistened sponge or immersed in water, see Sensor Storage for more
information. If the sensor dries out, refer to the Rehydration procedure
in this manual.
Refer to Figure 7 below when following the instructions for replacing the
cap.
Caution: Avoid touching the sensing end of the sensor cap
1. Remove the old sensor cap assembly from the sensor by grasping
the probe body with one hand and then rotating the sensor cap
counterclockwise until it is completely free. Do not use any tools for
this procedure.
2. Inspect the o-ring on the probe for damage. If there is any indication
of damage, carefully remove the o-ring and replace it with the new
o-ring included with the replacement sensor cap. Do not use any
tools to remove the o-ring.
3. Ensure that the o-ring installed on the probe is clean. If necessary,
wipe clean with a lint free cloth or replace the o-ring as described in
the previous step.
4. Locate the o-ring lubricant included with the new sensor cap. Apply
a thin coat of o-ring lubricant to the installed o-ring. Remove any
excess o-ring lubricant from the o-ring and/or probe with a lens
cleaning tissue.
during the following maintenance procedures.
Figure 7
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