Pneumatic Connections; Connecting The Supply Air; Signal Pressure Connection - Samson 3725 Mounting And Operating Instructions

5.6 Pneumatic connections

WARNING
!
Risk of injury by possible movement of the
actuator stem after connecting the signal
pressure.
Do not touch or block the actuator stem.
NOTICE
!
Incorrect connection of the supply air will
damage the positioner and will lead to mal-
function.
− Screw the screw fittings into the connecting
plate, pressure gauge mounting block or
connection block from the accessories.
− Keep the length of the line as short as pos-
sible to avoid delays in control signal
transmission.
The pneumatic connections are optionally
designed as a bore with ¼ NPT or G ¼
thread. The customary fittings for metal and
copper pipes or plastic hoses can be used.
EB 8394 EN
NOTICE
!
Risk of malfunction due to failure to comply
with required air quality.
Only use supply air that is dry and free of oil
and dust.
Read the maintenance instructions for up-
stream pressure reducing stations.
Blow through all air pipes and hoses thor-
oughly before connecting them.

5.7 Connecting the supply air

NOTICE
!
Risk of malfunction due to incorrect sequence
of mounting, installation, and start-up.
Keep the following sequence.
1. Remove the protective caps from the
pneumatic connections.
2. Mount the positioner on the valve.
3. Connect the supply air.
4. Connect the electrical power.
5. Perform the start-up settings.
5.7.1 Signal pressure connec-
tion
The signal pressure connection depends on
how the positioner is mounted onto the actu-
ator:
Type 3277 Actuator
Î The signal pressure connection is fixed
when the positioner is directly attached
to the Type 3277 Actuator.
Mounting and start-up
43