Hach GS1140 Manual Del Usuario página 21

5.3 Replace the O-ring
If the O-ring at the connector end of the sensor becomes worn and no longer keeps water out of the
cable guard and/or cable guard extension, replace the O-ring.
If the O-rings that are seen when the sensor cap is removed become worn and no longer supply a
seal when the air flow cell is used, replace the O-rings.
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