Norac UC3, Manual

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8 Replacing O-Rings
NORAC recommends that all black rubber O-rings be replaced
with an orange silicone O-ring even if the transducer is not being
replaced. See Section 2 for ordering information.
8.1 Using a small flat screwdriver, remove the O-ring from around the
sensor transducer.
8.2 Thoroughly cleanse the area where the O-ring is installed with
Isopropyl alcohol and allow to dry. If the transducer is not being
replaced, also thoroughly cleanse the outer rim of the transducer
where it contacts the O-ring.
8.3 Position the transducer so it sits flat in the sensor casing. The
transducer should not rock back and forth and should be flush with
the top edge of the cut-out once it is properly seated in the casing.
NOTE: Do NOT use any type of grease or lubricant on the o-ring.
8.4 Press the O-ring into place.

When inserting the O-ring, be sure it is inserted as evenly as
possible.

The O-ring cannot have any bulges in it or have any spots that sit
higher than the rest of the O-ring.

Inspect the gold foil on the transducer to ensure there are no
wrinkles.
8.5 A recalibration should now be performed as outlined in Section 5 for
a UC4 sensor and Section 6 for a UC3 sensor.