YSI Pro20 - Manual (Page 32)

GENERAL MAINTENANCE – DO SENSOR PORT
It is important that the entire sensor connector end be dry when installing,
removing, or replacing. This will prevent water from entering the port. Once a
sensor is removed, examine the connector inside the port. If any moisture is
present, use compressed air to completely dry the connector or place directly in
front of a steady flow of fresh air. If the connector is corroded, contact YSI
Technical Support or the Authorized dealer where you purchased the instrument.
Remove sensors upside down (facing the ground) to help prevent
water from entering the port upon removal.
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SENSOR MAINTENANCE
SENSOR MAINTENANCE - TEMPERATURE
You must keep the temperature portion of the sensor free of build up. Other than
that, the sensor requires no maintenance. A toothbrush can be used to scrub the
temperature sensor if needed.
SENSOR MAINTENANCE – DISSOLVED OXYGEN
Membrane Cap Installation
The DO sensor (Polarographic and Galvanic) is shipped with a dry, protective red
cap that will need to be removed before using. Remove the protective cap or used
membrane cap and replace it with a new membrane cap following these
instructions:
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Remove the sensor guard to access the sensor tip.
Remove the protective red cap or unscrew and remove any
old membrane cap by holding the sensor when unscrewing
the membrane cap and discard.
Thoroughly rinse the sensor tip with distilled or DI water.