Samson 3730-4, Монтаж и эксплуатация

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2.7 Attaching an external
position sensor
Refer to Table 7 on page 45 for a list of the
mounting parts as well as the accessories
required for mounting the position sensor.
Accessories for the pneumatic connection to
the positioner housing can be found in
Table 8.
In the positioner version with an external po-
sition sensor, the sensor placed in a sepa-
rate housing is attached over a plate or
bracket to the control valve. The travel
pick-off corresponds to that of a standard
device.
The positioner unit can be mounted as re-
quired to a wall or a pipe.
For the pneumatic connection
either a con-
necting plate (6) or a pressure gauge
bracket (7) must be fixed to the housing, de-
pending on the accessory chosen. Make
sure the seal rings (6.1) are correctly in-
serted (see Fig. 6, bottom right).
For the electrical connection a 10 m con-
necting lead with M12x1 connectors is in-
cluded in the scope of delivery.
Note:
– In addition, the instructions in section 3.1
and 3.2 apply for the pneumatic and
electrical connection.
Operation and setting are described in
sections 4 and 5.
– Since 2009, the back of the position sen-
sor (20) is fitted with two pins acting as
mechanical stops for the lever (1). If this
position sensor is mounted using old
mounting parts, two corresponding
Ø 8 mm holes must be drilled into the
mounting plate/bracket (21). A template
is available for this purpose. Refer to Ta-
ble 7 on page 45.
2.7.1 Mounting the position
sensor with direct
attachment
Type 3277-5 Actuator with 120 cm²
The signal pressure from the positioner is
routed over the signal pressure connection
of the connecting plate (9, Fig. 17 left) to the
actuator diaphragm chamber. To proceed,
first screw the connecting plate (9) included
in the accessories onto the actuator yoke.
4
Turn the connecting plate (9) so that the
correct symbol for the fail-safe position
"Actuator stem extends" or "Actuator
stem retracts" is aligned with the marking
(Fig. 17, below).
4
Make sure that the gasket for the
connecting plate (9) is correctly inserted.
4
The connecting plate has boreholes with
NPT and G threads. Seal the threaded
connection that is not used with the
rubber seal and square plug.
40
EB 8384-4 EN
Attachment to the control valve – Mounting parts and accessories
Fig. 16 · Positioner unit with sensor mounted on a
micro-flow valve