Emergency Action; Decommissioning And Removal; Decommissioning; Removing The Positioner - Samson 3730-0 Mounting And Operating Instructions

Decommissioning and removal

9.1 Emergency action

Upon failure of the air supply or electric sig-
nal, the positioner vents the actuator, causing
the valve to move to the fail-safe position de-
termined by the actuator.
Tip
Emergency action in the event of valve or ac-
tuator failure is described in the associated
valve and actuator documentation.
Î The plant operator is responsible for
emergency action to be taken in the
plant.
10 Decommissioning and
removal
DANGER
!
Risk of fatal injury due to ineffective explo-
sion protection.
The explosion protection becomes ineffective
when the positioner cover is opened.
The following regulations apply to installa-
tion in hazardous areas: EN 60079-14
(VDE 0165, Part 1).
NOTICE
!
The process is disturbed by interrupting
closed-loop control.
Do not mount or service the positioner while
the process is running and only after isolat-
ing the plant by closing the shut-off valves.
56

10.1 Decommissioning

To decommission the positioner before re-
moving it, proceed as follows:
1. Disconnect and lock the air supply and
signal pressure.
2. Open the positioner cover and discon-
nect the wires for the control signal.

10.2 Removing the positioner

1. Disconnect the wires for the control sig-
nal from the positioner.
2. Disconnect the lines for supply air and
signal pressure (not required for direct
attachment using a connection block).
3. To remove the positioner, loosen the three
fastening screws on the positioner.

10.3 Disposal

Î Observe local, national and internation-
al refuse regulations.
Î Do not dispose of components, lubricants
and hazardous substances together with
your other household waste.
EB 8384-0 EN