SMAR FY301, Instruction, Operations & Maintenance Manual

Page: 45 / 82

Maintenance Procedures
5.7
4. Remove the o-ring’s with an appropriate tool;
5. Dive the part in petroleum base solvent and dry it with dry compressed air (apply the
compressed air directly in the smaller orifice for the air to get out through the bigger orifice).
6. Introduce the appropriate tool (PN 400-0726) into the restriction orifice to prevent any possible
obstruction;
7. Mount the o-rings again and screw the restriction in the positioner.
8. Apply instrument air into the equipment and it shall work normally.
Change of the Filter Elements
Replace the positioner filter elements (
28
- part number 400-0655) with a minimum stated period of 1
(one) year.
The instrument air supply must be clean, dry and non-corrosive, following standards indicated for the
American National Standard
“Quality Standard for Instrument Air
" - (ANSI/ISA S7.0.01 - 1996).
If the instrument air does not comply with the above mentioned standards, the user has to consider
replacing the positioner filter elements more frequently.
Exhausts Ports
Air is vented to the atmosphere through the two exhausts ports located behind the transducer
nameplate and 4 output of the opposite side from gage. Any strange object interfering or blocking the
exhaust port may degrade the positioner performance. Clean the exhausts periodically by spraying it
with a solvent.
ATTENTION
Never use oil or grease in the spool valve; lubricants may degrade the positioner performance.