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2.3.4 Mounting kit
2.3.5 Purge air switching (not in the explosion proof version)
Figure 13
Purge air switch on the valve block, view of the positioner onto pneumatic connection side
with cover open
2.3.6 Restrictors
Figure 14
Restrictors
SIPART PS2 PA Manual
A5E00127926--05
The positioner can be mounted on almost all actuators with the
appropriate mounting kit.
The purge air switch is accessible above the pneumatic terminal strip
with the housing open (figure 13). In the IN position the inside of the
housing is purged with very small amounts of clean, dry instrument air.
In the OUT position the purge air is fed directly to the outside air (for
more information: see Chapter 3.3, page 47).
In order to achieve travel times of > 1.5 s in small actuators, the air rate
can be reduced with the restrictors Y1 and Y2 (figure 14, in explosion
proof version, see figure 11, page 27). By turning to the right the air
rate is reduced up to shutting off. To set the restrictors it is advisable to
close them and then open them slowly (see initialization RUN3).
In the case of double-acting valves make sure that both chokes are set
approximately equal.
Design and method of operation
Hexagon socket 2.5 mm
Y1 Y2
29
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