Samson 3730-0 Mounting and operating instructions - Connections
Threaded bushing
(M20 x 1.5):
G ¼
¼ NPT
0310-2619
0310-2550
NOTICE
The adapter uses one of the M20 x 1.5 con-
nections in the housing which means just
one cable gland can be installed.
Should other valve accessories be used
which vent the actuator (e.g. solenoid valve,
volume booster, quick exhaust valve), this
exhaust air must also be included in the
purging function. The connection over the
adapter at the positioner must be protected
with a check valve (e.g. check valve G ¼,
order no. 8502-0597) mounted in the pip-
ing. Otherwise the pressure in the positioner
housing would rise above the ambient pres-
sure and damage the positioner when the
exhausting components respond suddenly.
5
Connections
WARNING!
Mount the positioner, keeping the following
sequence:
1. Remove the protective film from the
pneumatic connections
2. Mount the positioner on the control valve
3. Connect the supply air
4. Connect the electrical power
5. Perform the start-up settings
The connection of the electrical auxiliary
power may cause the actuator stem to move,
depending on the operating mode.
Do not touch the actuator stem or obstruct it
to avoid risk of injury to hands or fingers.
5.1 Pneumatic connections
NOTICE
Follow the instructions below to avoid dam-
aging the positioner:
–
The threaded connections in the
positioner housing are not designed di-
rect air connection!
–
The supply air must be dry and free from
oil and dust.
The maintenance instructions for up-
stream pressure reducing stations must
be observed.
Blow through all air pipes and hoses
thoroughly prior to connecting them.
The screw glands must be screwed into the
connecting plate, the pressure gauge mount-
ing block or the connection block from the
accessories. The air connections are option-
EB 8384-0 EN
23
Connections