Samson TROVIS 3730-3, Mounting And Operating Instructions

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78 EB 8384-3 EN
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.
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
(stainless steel) G ¼
¼ NPT 1402-0265
1400-7108
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.
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.
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.
Note
NOTICE !