Attaching Positioners With Stainless Steel Housings; Air Purging Function For Single-Acting Actuators - Samson 3730-5 Mounting And Operating Instructions

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.
Note:

The pneumatic connecting plate and
pressure gauge bracket are available
in stainless steel (order numbers listed
below). The Type 3710 Pneumatic Re-
versing Amplifier is also available in
stainless steel.
Connecting plate
(stainless steel)
Pressure gauge
bracket
(stainless steel)
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 pneu-
matic connecting plate routes the air internal-
ly 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.
EB 8384-5 EN
Attachment to the control valve – Mounting parts and accessories
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 5 can be used
except for the heavy-duty version. Connect-
ing plate in stainless steel.
4.10 Air purging function for sin-
gle-acting actuators
The instrument air leaving from the positioner
is diverted to the actuator spring chamber to
provide corrosion protection inside the actua-
tor. 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.
NOTICE
Mounting possibly incorrect
when old powder-paint-coated
aluminum connection blocks are
used.
Mount old powder-paint-coated
aluminum connection blocks as
described in sections on„Attach-
ment according to IEC 60534-6
(NAMUR rib or attachment to
rod-type yokes)" and „Attach-
ment to rotary actuators".
FE: The air purging function is automatically
provided.
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