Samson foundation 3787, Mounting And Operating Instructions, Page: 24 / 96

3 Connections
3.1 Pneumatic connections
The air connections are either 1/4 NPT or
G 1/4 tapped holes. Customary fittings for
metal and copper pipes or plastic tubes can
be used.
Note!
The supply air must be dry and free from oil
and dust. Observe the maintenance instruc-
tions for upstream pressure reducing station-
s. Carefully purge all tubes before connect-
ing them.
If the positoner is attached directly to Type
3277 Actuator, the connection for the sig-
nal pressure is fixed. For NAMUR attach-
ment, the signal pressure can be applied to
either the top or bottom diaphragm cham-
ber depending on the fail-safe position "ac-
tuator stem extends or retracts".
Exhaust air: The exhaust air connection of
the positioner is included in the mounting
parts. For direct attachment of the posi-
tioner, there is a vent plug on the plastic
cover of the actuator. For NAMUR attach-
ment, this plug is on the adapter housing
and for attachment to rotary valves, it is on
the intermediate piece or reversing ampli-
fier.
3.1.1 Pressure gauge
We recommend mounting pressure gauges
for supply air and signal pressure to moni-
tor the positioner. The parts are listed as ac-
cessories in Tables 3, 4 and 6.
Fig. 8
⋅
Mounting the pressure gauge
2...3mm
Nut Throttle with filter
Order no. 0250-1090 1790-6121
24
EB 8383-1 EN
Connections