Samson 3730-0 Mounting and operating instructions - Stainless Steel Housings
4.5 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 pres-
sure gauge bracket are available in stainless
steel (order numbers listed below). The
Type 3710 Pneumatic Reversing Amplifier is
also available in stainless steel.
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 4 (pages 10 and 11) 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.
4.6 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 cm²
FA: Remove the stopper 12.2 (Fig. 5 on
page 15) at the connection block and
make a pneumatic connection to the
spring chamber on the vented side.
NOTICE
The method described does not apply to
old connection blocks in powder-paint-
coated aluminum. In this case, follow
the instructions for attachment described
below in “Attachment acc. to IEC
60534-6 (NAMUR rib or attachment to
rod-type yokes) and to rotary actua-
tors”.
FE: The air purging function is automati-
cally provided.
Attachment acc. to IEC 60534-6 (NAMUR
rib or attachment to rod-type yokes)
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:
22
EB 8384-0 EN
Attachment to the control valve – Mounting parts and accessories