57
Markings, Certificates and Approvals
GB
Model 9010/9020 SIL
10.3 Special Conditions for the Safe Use of the Gas Warning Unit 9010/9020 in SIL Applications
Safety Relevant Parameters for the Gas Warning Unit 9010/9020
Using Relays
Possible Structures and Acquirable SILs
The following table shows, which structure has to be selected, to fulfill the requirements of a
special SIL.
LDM = Low Demand Mode
HDM = High Demand or Continuous Mode
Using Relays
Depending on the selected configuration the following safety-relevant parameters have to be
considered while implementing the safety loop:
General Conditions for Safe Use
(1) The application advice and the limitations of the manual have to be considered.
(2) For calibration and maintenance, the regional and national regulations have to be
considered.
(3) A defect Gas Warning Unit 9010/9020 has to be repaired within 72 h.
(4) An ambient temperature above 40 °C is to be avoided.
(5) External power supplies must fulfil the requirements of EN 60950 and EN 50178 for SELV,
PELV.
(6) The communication interfaces are not allowed to be used for the transmission of safety
related data.
(7) The 4…20 mA - Output is not allowed to be used for safety function.
Typ B
Structure 1oo1 or 1oo2
HFT 0 or 1
MTTR 72 h
T1 1 Year (Proof-Test-Interval)
β 2%
β
D
2%
SC 3 systematic capability
SIL 1 SIL 2 SIL 3
LDMHDMLDMHDMLDMHDM
Structure 1oo1 X X X
Structure 1oo2 X X X X X X
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