Situations in which it is not possible to depressurize the actuator on demand or in the case of
a fault represent hazardous failure.
WARNING
Disregarding conditions for fulfilling the safety function
Disregarding conditions can result in a malfunction of the process system or application, for
example, process pressure too high, maximum level exceeded.
The mandatory settings and conditions are listed in sections "Settings (Page 194)" and
"Safety characteristics (Page 195)".
● These conditions must be met in order to fulfill the safety function.
The pneumatic block of the positioner pressurizes and depressurizes the actuator. The
characteristic service life of the pneumatic block depends on the load. On average, it is approx.
200 million switching cycles. The number of control procedures for the switching cycles is called
in the local display or via HART communication. For more details, see Diagnostic value
'42.VENT1' / '43.VENT2' (Page 225).
NOTICE
Freezing of the exhaust air outlets
When devices of the type 6DR5..0/1/2/3 are used, the exhaust air outlets ② may freeze. The
function of the device is impaired.
● Do not install the positioner with the base plate ① pointing up.
① Base plate
② Exhaust air outlets
Figure 9-1 Exhaust air outlets, base plate
Functional safety
9.2 Safety function
SIPART PS2 with 4 to 20 mA/HART
192 Operating Instructions, 11/2019, A5E00074631-AE
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