EP5 Electro Pneumatic Digital Positioner FCD PMENIM0006-00-A5 12/18
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O-rings
With time and use, O-rings can become brittle. This can cause poor operation and even failure of
the positioner.
Always check O-rings when performing any work on the positioner and replace bad O-rings.
A thin layer of silicon grease applied on the NBR (Black) O-rings prolongs their life. On Q (red)
O-rings, use a non silicon based grease.
Filter plug (EP5)
EP5 is equipped with a built in secondary filter located on the side of the I/P unit.
For replacement or inspection, make sure that positioner unit is not pressurized, then unscrew filter
plug 1. Remove filter 3 and install a new into the filter plug . Check condition of O-ring 2 and filter
compartment. If moisture is found, check upstream filters/oil-water separators.
Moisture can cause I/P failure.
Reinstall filter plug.
Caution!
Do not operate the unit without filter and filter plug installed. Do not attempt to unscrew filter
plug while positioner is pressurized.
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