Table of Contents
Advertisement
5
Safety-related applications
The following information applies for the device:
Designation
JUMO Ex-i repeater power supply and input isolating amplifier
The safety-oriented repeater power supply and input isolating amplifier mentioned above is certified for
compliance with DIN EN 61508 and IEC 62061.
Test certificate: ZP/C006/21
5.1
Safety function and safety requirements
The safety function of the device consists of galvanically isolated transmission of a standard signal of
4 to 20 mA with a max. deviation of 2 %.
Output values outside the range of 3.6 to 21 mA are considered a safe operating state, which is detected
by the downstream control system.
Safe faults in the device are therefore those where the device delivers an output signal that does not
deviate more than 2 % from the input signal.
Hazardous, unidentifiable faults are those where the device does not follow a change in the input signal
or deviates by more than 2 % from the input signal and is not outside the range.
Hazardous, identifiable faults are those that deliver a signal outside of the range (< 3.6 mA/> 21 mA).
5.2
1-channel operation as a repeater power supply and input isolating am-
plifier for SIL2 (1oo1) applications
5.2.1
Safety/integrity requirements
Fault rates
•
Type A device (according to IEC/EN 61508-2)
•
Safety integrity level (SIL) 2 (1oo1 structure)
•
Systematic capability (SC) 3 (1oo2 structure)
•
HFT 0
•
MTTR 24 h
•
MTR 8 h
•
Mission time 10 years
•
Safety response time 2 s
•
Ambient temperature 40 °C
•
Proof test coverage (PTC) 97 %
•
Process safety time 500 ms
•
Switch-on duration 2 s
Safety characteristics according to IEC 61508 Edition 2
SU
251
The entire failure rate is 558 FIT.
The MTBF is therefore 205 years.
The fault rates are used to calculate the average probability of failure of the designed function in the
event of a request for the operating type "low demand" and the probability of a hazardous failure per hour
for the operating type "continuous demand".
SD
DU
0
62.1
5 Safety-related applications
SFF
DD
0
80.17 %
Part no.
00577948
DC
D
0 %
19
Advertisement
Table of Contents
