Operating instructions

SIPART PS2 with and without HART communications
Operating Instructions, 09/2008, A5E00074631-08
205
Service and maintenance
12
The positioner is maintenance-free to a large extent. Screens are installed in the pneumatic
connections of the positioners to protect them from rough dirt particles. If there are dirt
particles in the pneumatic auxiliary power supply, they damage the screens and hamper the
function of the positioner. Clean the screens as described in the following two chapters.
12.1 Positioner in the metal enclosure and in the flameproof enclosure
Dismantling and installation
1. Disconnect the pneumatic auxiliary power supply.
2. Remove the pipelines.
3. Remove the metal screen from the bores carefully.
4. Clean the metal screens, e.g. using compressed air.
5. Insert the screens.
6. Connect the pipelines again.
7. Feed the pneumatic auxiliary power supply.
12.2 Positioner in the plastic enclosure
DANGER
Risk of explosion due to electrostatic charge
Electrostatic charges develop when cleaning the positioner in the plastic enclosure with a
dry cloth.
It is imperative you avoid electrostatic charges in the hazardous environment.
Dismantling
1. Disconnect the pneumatic power supply.
2. Remove the lines.
3. Unscrew the cover.
4. Unscrew the three self-tapping screws on the pneumatic terminal strip.
5. Remove the screens and O-rings behind the terminal strip.
6. Clean the screens, e.g. using compressed air.