Functional safety
8.6 Maintenance/check
SIPART PS2 with and without HART
Operating Instructions, 10/2013, A5E00074631-11
145
● The average temperature viewed over a long period is 40 °C.
● Fault rates are calculated on the basis of a mean time to repair (MTTR) of 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 whereby the pressure outlet is not
depressurized or the safety position is not reached when the signal source is 0 mA or the
power supply source is 0 V.
Settings (Page 144)
Maintenance/check
Interval
We recommend that the functioning of the positioner is checked at regular intervals of one
year.
Checking the safety function
Check the safety function as detailed in chapter "Settings (Page 144)"
Verify the safety function of the entire safety circuit on a regular basis in accordance with
IEC 61508/61511. The test intervals are determined in the course of calculations for each
safety circuit of a system (PFD
AVG
).
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