WESTLOCK CONTROLS CORPORATION
280 N. MIDLAND AVE., STE. 258, SADDLE BROOK, NJ 07663 TEL: 201-794-7650 FAX: 201-794-0913
www.westlockcontrols.com
10/5/2013
TECH-477/D.W.O. 21424
Page 195 of 206
To Pin 2
(Red+)
To Pin 4
(Black-)
4-20 mA
Signal
Generator
*(Do Not Exceed
3.3 mA)
15 Appendix D – General Maintenance Standard Flow
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.
TRANSDUCER PIN CONNECTOR
