Commissioning   
7.3 Purge air switching 
  SIPART PS2 with and without HART 
122  Operating Instructions, 10/2013, A5E00074631-11 
 
 
When the enclosure is open, the purge air switch above the pneumatic terminal strip on the 
pneumatic 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.  
 
Pneumatic connections Y1, Pz and Y2 
Figure 7-1  Purge air switch on the pneumatic block; view of the positioner on the pneumatic 
connection side when the cover is open 
The factory setting is the "IN" position.