Samson 3767 - Pneumatic Connection; Pressure Gauges; Supply Pressure

5-18 EB 8355-2 EN
Installation
5.4 Pneumatic connection
Risk of injury by possible movement of the
actuator stem after connecting the signal
pressure.
Î Do not touch or block the actuator stem.
The pneumatic connections are optionally
designedasaborewith¼NPTorG¼
thread.Customaryttingsformetalorcop-
per tubing or plastic hoses can be used.
Risk of malfunction due to failure to comply
with air quality requirements.
Î Only use supply air that is dry and free
of oil and dust.
Î Read the maintenance instructions for
upstream pressure reducing stations.
Î Blow through all air pipes and hoses
thoroughly before connecting them.
If the positioner is attached directly to the
Type3277Actuator,theconnectionofthe
positioner's output pressure to the actuator is
xed.Forattachmentaccordingto
IEC60534-6(NAMUR),thesignalpressure
can be routed to either the top or bottom di-
aphragm chamber of the actuator, depend-
ing on the actuator's fail-safe action "actua-
tor stem extends" or "actuator stem retracts".
Exhaust air
Modelswithindex3767-x...x.03 and higher
are equipped with a hinged cover without its
own exhaust air port. The exhaust air con-
nections for these models are included in the
accessories.
The vent plug is located on the plastic cover
of the actuator for direct attachment, where-
as for NAMUR attachment, it is located on
the adapter housing. The vent plug is located
on the intermediate piece or reversing ampli-
erforattachmenttorotaryactuators.
If you intend to replace older models with in-
dex 3767-x...x.02 or lower, the mounting
parts may need to be replaced as well.
5.4.1 Pressure gauges
To precisely tune the positioner, we recom-
mend installing pressure gauges for the sup-
ply air and signal pressure.
The required parts are listed as accessories
insection5.8.
5.4.2 Supply pressure
The required supply air pressure depends on
the bench range and the actuator's operat-
ing direction (fail-safe action).
The bench range is written on the nameplate
either as the bench range or signal pressure
range. The operating direction is marked FA
or FE or by a symbol.
WARNING
!
NOTICE
!
Note