Attaching Positioners With Stainless Steel Housings; Air Purging Function For Single-Acting Actuators - Samson 3730-3 Mounting And Operating Instructions

Mounting and start-up
5.13 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)
Pressure gauge
bracket
(stainless steel)
Table 9 to Table 7 apply for attaching posi-
tioners with stainless steel housings with the
following restrictions:
Direct attachment
All mounting kits from Table 2 and Table 3
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 4 can be used.
Connecting plate in stainless steel.
78
G ¼ 1400-7476
¼ NPT 1400-7477
G ¼ 1402-0265
¼ NPT 1400-7108
Attachment to rotary actuators
All mounting kits from Table 7 can be used
except for the heavy-duty version. Connect-
ing plate in stainless steel.
5.14 Air purging function for
single-acting actuators
The instrument air leaving the positioner is
diverted to the actuator spring chamber to
provide corrosion protection inside the actu-
ator. Observe the following:
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. 7) at the
black connection block and make a
pneumatic connection to the spring
chamber on the vented side.
NOTICE
!
Mounting possibly incorrect when old
powder-paint-coated aluminum connec-
tion blocks are used.
Mount old powder-paint-coated
aluminum connection blocks as
described in sections on „Attachment
according to IEC 60534-6 (NAMUR rib
or attachment to rod-type yokes)" and
„Attachment to rotary actuators".
FE: The air purging function is automatically
provided.
EB 8384-3 EN