Attaching An External Position Sensor; Mounting The Position Sensor With Direct Attachment - Samson 3730-3 Mounting And Operating Instructions

Attachment to the control valve – mounting parts and accessories
2.6 Attaching an external
position sensor
Refer to Table 6 on page 33 for a list of the
mounting parts as well as the accessories re-
quired for mounting the position sensor.
Accessories for the pneumatic connection to
the positioner housing can be found in Ta-
ble 7.
In the positioner version with an external
position 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. 5, bottom right).
For the electric connection the connecting
lead must be fitted with an M12x1 connec-
tor plug at one end. The lead end without
the plug can be shortened, if required, and
wired to the connector included (section 3.2
on page 36). The electrical and pneumatic
connections between the sensor and the
positioner unit may be a maximum of 10
meters.
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 sec-
tions 4 and 5.
28
EB 8384-3 EN
Fig. 10 · Positioner unit with sensor mounted on a
micro-flow valve
2.6.1 Mounting the position sensor
with direct attachment
Type 3277-5 Actuator with 120 cm
The signal pressure from the positioner is
routed over the signal pressure connection
of the connecting plate (9, Fig. 11 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 mark-
ing (Fig. 11, below).
4
Make sure that the gasket for the con-
necting 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.
2