Operating instructions

Functional safety
8.2 Device-specific safety instructions
SIPART PS2 with and without HART communications
Operating Instructions,A5E00074631-09
111
● The air outlet does not contain any additional cross-sectional contractions leading to an
increased dynamic pressure. In particular, a silencer is only allowed if icing or other
contamination is ruled out.
● The restrictor in the Y1 circuit may not be completely closed during operation.
● The auxiliary pneumatic power is free of oil, water and dirt in line with:
DIN/ISO 8573-1, maximum class 2
● The average temperature viewed over a long period is 40°C.
● The MTTR after a device fault is 8 hours.
● In case of a fault, the pneumatic outlet of the positioner is depressurized. A spring in the
pneumatic actuator must move the valve to the pre-defined, safe end position.
● A dangerous failure of the positioner is a failure where the pressure outlet is not
depressurized, or the safety position is not reached, when the input current < 3.6 mA.
● If a partial stroke test is running, the safety function is only triggered when the electrical
and pneumatic power supply is switched off. The safety function is not triggered by an
input current less than 3.6 mA. The partial stroke test is available as of firmware version
4.00.00.
Chapter 8 is invalid and is replaced by
Compact operating instructions
"Functional Safety SIPART PS2" A5E00442120-04