PrimaX
GB
55
7.3 Special conditions for the safe use according to ATEX and SIL appli-
cations
Safety relevant parameters for the Gas Transmitters
Possible structures and acquirable SILs
The following table shows, which structure has to be selected, to fulfil the require-
ments of a special SIL.
LDM = Low Demand Mode
HDM = High Demand or Continuous Mode
Depending on the selected configuration and the sensor version, the following safe-
ty-relevant parameters have to be considered while implementing the safety loop:
General conditions for the safe use
- The application advice and the limitations of the manual have to be considered.
For calibration and maintenance, the regional and national regulations have to
be considered.
- A defect transmitter has to be repaired within 72 hours.
- The HART
®
interface is not allowed to be used for the transmission of safety re-
lated data.
- The alarm conditions of the transmitter must be periodically checked together
with the typical gas calibration checks.
- The relays must be energised under normal conditions.
Type B
Structure 1oo1 or 1oo2
HFT 0 or 1
PFD, PFH, SFF see table
tot
,
D
,
DU
,
DD
see table
MTTR 72 h
T1 16 weeks [Proof-Test-Interval]
SIL1 SIL2 SIL3
LDM HDM LDM HDM LDM HDM
Structure 1oo1 XXX
Structure 1oo2 XXXXXX
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