7.9 Purge air switching
When the enclosure is open, the purge air switch above the pneumatic terminal strip on the
valve block can be accessed.
● In the IN position, the enclosure is flushed from inside with a small volume of clean and dry
instrument air.
● In the OUT position, the purge air is directly directed towards outside.
① Purging air selector
② Pneumatic connections Y1, PZ and Y2
Figure 7-1 Purge air switch on the valve block; view of the positioner on the pneumatic connection
side when the cover is open
The factory setting is the "IN" position.
7.10 Commissioning linear actuators
7.10.1 Preparing linear actuators for commissioning
Condition
You have already installed the positioner using the suitable mounting kit.
Setting the transmission ratio selector
Note
Commissioning
The setting of the transmission ratio selector is extremely important to commission the
positioner.
Stroke [mm] Position of the transmission ratio selector
5 to 20 33°
25 to 35 90°
40 to 130 90°
Commissioning
7.10 Commissioning linear actuators
SIPART PS2 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E00074631-AE 117
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