JUMO Ex-i, Руководство по безопасности

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6 Safety-related applications
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6.5 Operating mode
Operating mode according to IEC/EN 61508: "low-demand mode" or "high-demand mode".
6.6 Failure behavior and required reaction
• The safe state is adopted when a line fault is detected or if the voltage supply fails.
• The safe state is achieved by disconnecting the connection terminals.
6.7 Safety/integrity requirements
Safety characteristics
• Type A device (according to IEC/EN 61508-1 and 61508-2)
• Safety integrity level (SIL) 2
• Systematic capability (SC) 2
• HFT 0
• Low-demand mode or high-demand mode
• MTTR = 24 h
• 1-channel: 1001 structure
• Ambient temperature 40 °C
• Mission time 10 years
• Proof test coverage (PTC) 99 %
List of configurations considered
Configuration Operation Relay contact Relay load
C1 Not inverted Normally closed
contact Load field IV, up to AC 250 V, 2 A or DC 30 V,
2 A resistive or weakly inductive load
(cos
ɸ > 0.95)
C2 Not inverted Normally closed
contact Load field II, up to AC 120 V, 2 A resistive or
weakly inductive load (cos
ɸ > 0.95)
C3 Inverted Normally closed
contact Load field IV, up to AC 250 V, 2 A or DC 30 V,
2 A resistive or weakly inductive load
(cos
ɸ > 0.95)
C4 Inverted Normally closed
contact Load field II, up to AC 120 V, 0.2 A resistive or
weakly inductive load (cos
ɸ > 0.95)
C5 Not inverted Normally open con-
tact Load field IV, up to AC 250 V, 2 A or DC 30 V,
2 A resistive or weakly inductive load
(cos
ɸ > 0.95)
C6 Not inverted Normally open con-
tact Load field II, up to AC 120 V, 0.2 A resistive or
weakly inductive load (cos
ɸ > 0.95)
C7 Inverted Normally open con-
tact Load field IV, up to AC 250 V, 2 A or DC 30 V,
2 A resistive or weakly inductive load
(cos
ɸ > 0.95)
C8 Inverted Normally open con-
tact Load field II, up to AC 120 V, 0.2 A resistive or
weakly inductive load (cos
ɸ > 0.95)