Model 3440 Appendix A–17
CAUTION
Cleaners and lubricants can damage the keypad. Do
not allow these chemicals to make contact with the
keypad!
Currently, the Model 3440 gauge topshell is manufactured from
an engineering thermoplastic designed specifically to provide
high impact strength and to offer excellent compatibility with
many industrial solvents and petrochemicals. The topshell may
be cleaned with mild (low alkaline) soap and water. Other
approved cleaning substances include methyl, isopropyl, or
isobutyl alcohols.
CAUTION
The use of any unapproved cleaning agents such as
methyl-ethyl-ketones, amines, and methylene chloride
will damage the topshell and void the warranty.
Source Rod Lubrication
If the source rod does not slide up and down freely, the source
rod bearing may require cleaning and lubrication.
Remove the control panel assembly from the gauge by
loosening the four captive screws that secure it to the
topshell. Lift the control unit and disconnect the ribbon
cable. Set control unit aside.
Locate the grease fitting at the base of the source rod tower.
NOTE
The vent valve was not installed on earlier gauges.
Instead, an Allen-head screw was located beneath the
grease fitting. On the gauges, remove the Allen-head
screw before applying lubricant to allow the old
grease to be ejected. Failure to remove the Allen
screw may result in severe mechanical damage to the
base assembly.
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