YSI ODO200 - Manual (Page 16)

10
SENSOR CAP REPLACEMENT
The sensor cap should be replaced about once per year but may last
longer. It should also be replaced if it is cracked or damaged (see
Troubleshooting section for instructions on how to inspect the cap for
damage). The instruction sheet shipped with the replacement ODO
sensor cap includes the calibration coefficients specific to your sensor
cap.
The replacement ODO 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.
Figure 7
Caution: Avoid touching the sensing end of the sensor cap during the
following maintenance procedures.
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.