Specifications

10/31/02 Tech-304/DWO 14195 Page 16 of 39
MOUNTING INSTRUCTIONS
3.5 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 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. (Increas-
ing 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 ISA-S7.3.
Maximum supply pressure is 120 psi. All
pneumatic connections are 1/4” NPT.
Inlet Port
Gage
Inlet Port
Outlet Port 2
Outlet Port 1
Gage
Outlet Port 1
1. Single Acting/Spring Return (Plug Outlet Port 2) increas-
ing signal causes pressure to increase in Outlet Port 1.
2. Double Acting/Double Return (Pipe Outlet Port 2 to drive
actuator towards the desired failure direction) increasing
signal causes pressure to decrease in Outlet Port 2 and
pressure to increase in Outlet Port 1.
Notes:
1. On loss of power pressure fails to Outlet Port 2.
Figure 3-9