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 27 of 206
5.5 Pneumatic Connection
Single Acting Actuator (Spring Return):
For single acting actuators Outlet Port 2 is to be plugged. Outlet Port 1 is to be piped to the
actuator inlet port that acts against the spring. (Increasing set-point signal causes pressure
to increase in Outlet Port 1 of the positioner).
Double Acting Actuator (Double Return):
For double acting actuators Outlet Port 2 is piped to drive the actuator towards the fail
position. Outlet Port 1 is piped to drive the actuator away from the fail position. (Increasing
set-point signal causes pressure to increase in Outlet Port 1 of the positioner and pressure
to decrease in Outlet Port 2 of the positioner).
Note: Air supply to the positioner must be clean, dry, oil free instrument air per ISO
8573-3.
Maximum Particle Size and Concentration of Solid Contaminants
Class
Maximum Particle Size (Microns)
Maximum Concentration (mg/m
3
)
3
5 5
Maximum Oil Content
Class
Maximum Concentration (mg/m
3
)
3
1
Maximum supply pressure is 120 psi. All pneumatic connections are 1/4” NPT.
Figure 5-9
