Samson 3730-5 - Attaching Positioners with Stainless Steel Housings; Air Purging Function for Single-Acting Actuators

4.7 Attaching positioners with
stainless steel housings
Positioners with stainless steel housings re
-
quire mounting parts that are completely
made of stainless steel or free of aluminum.
Note: The pneumatic connecting plate and a
pressure gauge bracket made of stainless
steel are available (order numbers listed be
-
low). The pneumatic reversing amplifiers in
stainless steel is not available.
Connecting plate
(stainless steel):
G ¼
¼ NPT
1400-7476
1400-7477
Pressure gauge
bracket (st. steel):
Only in
¼ NPT 1400-7108
The Tables 1 to 5 (pages 40 and 42) apply
for attaching positioners with stainless steel
housings with the following restrictions:
Direct attachment
All mounting kits from Tables 1 and 2 can
be used. The connection block is not re
-
quired. The stainless steel version of the
pneumatic connecting plate routes the air in
-
ternally to the actuator.
Attachment according to IEC 60534-6
(NAMUR rib or attachment to rod-type
yokes)
All mounting kits from Table 3 can be used.
Connecting plate in stainless steel.
Attachment to rotary actuators
All mounting kits from Table 4 can be used
except for the heavy-duty version. Con
-
necting plate in stainless steel.
4.8 Air purging function for
single-acting actuators
The exhaust air from the positioner is di
-
verted to the actuator spring chamber to
provide corrosion protection inside the actu
-
ator. The following must be observed:
Direct attachment to Type 3277-5 (stem ex
-
tends FA/stem retracts FE)
The air purging function is automatically
provided.
Direct attachment to Type 3277, 240 to
700 cm
2
FA: Remove the stopper 12.2 (Fig. 5 on
page 23) at the connection block and
make a pneumatic connection to the
spring chamber on the vented side.
FE: The air purging function is automati-
cally provided.
Attachment acc. to IEC 60534-6 (NAMUR
rib or attachment to rod-type yokes) and to
rotary actuators
The positioner requires an additional port
for the exhaust air that can be connected
over piping. An adapter available as an ac
-
cessory is used for this purpose:
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.
EB 8384-5 EN 39
Attachment to the control valve – Mounting parts and accessories