Samson 3730-4 - Attaching Positioners with Stainless Steel Housings; Air Purging Function for Single-Acting Actuators

EB 8384-4 EN 47
Attachment to the control valve – Mounting parts and accessories
4.9 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.
The pneumatic connecting plate and pres-
sure gauge bracket are available in stainless
steel (order numbers listed below). The
Type3710 Pneumatic Reversing Amplier is
also available in stainless steel.
Connecting plate
(stainless steel)
G¼
¼NPT
1400-7476
1400-7477
Pressure gauge
bracket
(stainless steel)
G¼
¼NPT
1402-0265
1400-7108
Table1 to Table6 apply for attaching posi-
tioners with stainless steel housings with the
following restrictions:
Direct attachment
All mounting kits from Table1 and Table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5 can be used
except for the heavy-duty version. Connect-
ing plate in stainless steel.
4.10 Air purging function for
single-acting actuators
The instrument air leaving from the position-
er is diverted to the actuator spring chamber
to provide corrosion protection inside the ac-
tuator. 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, 175 to
750cm²
FA:
Remove the stopper (12.2, Fig.4) at the
black connection block and make a
pneumatic connection to the spring
chamber on the vented side.
Mounting possibly incorrect when old
powder-paint-coated aluminum connec-
tion blocks are used.
Mount old powder-paint-coated alumi-
num connection blocks as described in
sectionsonAttachment according to
IEC60534-6 (NAMUR rib or attach-
ment to rod-type yokes) and Attachment
to rotary actuators.
FE: The air purging function is automatically
provided.
Note
NOTICE
!