Model 3430 Plus & 3440 Plus
REPLACING GASKET AND O-RING
The gauge uses a gasket and O-rings to protect its electronics from
moisture, dirt, and debris. However, if the gauge has been exposed
to extremely wet weather or high humidity, or if the gauge was used
in the cold and stored in a warm building, condensation may form
inside the gauge. If this happens, remove the control unit to allow
the gauge to dry. Use a hair dryer (on low heat) if necessary to
remove any built-up moisture. If moisture continues to be a problem
or debris is present inside the gauge base, the control panel gasket or
top shell O-ring may need replacing.
To replace the control panel gasket (part number 110841), loosen
the four captive screws that attach the control unit (keypad) to the
top shell. Carefully lift the control unit from the top shell and detach
the ribbon cable. Gently peel the old gasket from the panel and
replace it with a new gasket. Reconnect the ribbon cable and
reinstall the control unit.
To replace the top shell O-ring (part number 110899), remove the
six screws that hold the top shell to the gauge base. Lift the top shell
from the gauge base to expose the O-ring. Peel the old O-ring from
the groove in the gauge base. Place the replacement O-ring in the
groove, and run your finger around its circumference to ensure it is
properly seated in the groove. If the O-ring is too long, cut it to
length, ensuring that the two ends butt against each other.
Reassemble the top shell to the base.
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