WESTLOCK CONTROLS
280N MIDLAND AVENUE, STE.258, SADDLE BROOK, NJ 07663 TEL: 201-794-7650 FAX: 201-794-0913
www.westlockcontrols.com
12/20/2017 TECH-533/ D.W.O. 22902 Page 16 of 20
6 Maintenance and Repair
The positioner’s onboard filter should be replaced regularly or whenever it gets clogged.
See diagram below for location of the filter. Note: the following instructions are for
Standard Flow. For High Flow please contact the factory.
Important: The positioner’s onboard filter is not a substitute for normal instrument air
preparation. Supply air to the positioner should conform to ISA Standard S7.3 - Quality for
Instrument Air.
Important: The filter’s original color is chalk white. If the filter is discolored, its replacement
should be performed more often. A discolored filter may also indicate the need for an
evaluation of the air-supply quality. A filter/regulator with a 5 micron or better element,
just prior to the positioner, is therefore recommended.
Figure 11
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