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Attachment to the control valve
For double-acting, springless rotary actua-
tors, a reversing amplifier must be attached
to the positioner housing on the side where
it is connected to the actuator (see section
2.3.4).
If the positioner is attached to a SAMSON
Type 3278 Rotary Actuator, the air ex-
hausted from the positioner is admitted to
the inside of the actuator without any addi-
tional tubing.
If the positioner is attached to actuators
from other manufacturers (NAMUR), the air
is applied to the diaphragm chamber
through a tube with a tee connecting the ac-
tuator and the exhaust connection of the in-
termediate piece.
Note!
For faster control valves with a transit time
less than 0.6 seconds, replace the filter in
the signal pressure output (output 38) with a
screw-in throttle (see Accessories Table 6).
2.3.1 Mounting the lever with
feeler roll
1. Place lever with attached feeler roll
(35) on the transmission lever (37) and
secure it with the supplied screws (38)
and washers.
2.3.2 Mounting the intermediate
piece
SAMSON Type 3278 Actuator:
1. Screw adapter (36) to the free end of
the rotary actuator shaft, using two
screws.
18
EB 8383-1 EN
2. Position intermediate piece (34) on the
actuator housing and secure it with two
screws. Align the intermediate piece so
that the air connections of the posi-
tioner face the side of the diaphragm
case.
Actuators according to VDI/VDE 3845
1. Place the whole intermediate piece (34,
42, 44 and 45) onto the bracket in-
cluded in the delivery scope of the actu-
ator (fixing level 1 VDI/VDE 3845) and
secure with screws.
2. Align the cam disk (40) and scale (39)
as described in section 2.3.3 and screw
tight.
With springless actuators, the reversing am-
plifier must be screwed to the side of the po-
sitioner case. See section 2.3.4.
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