74 OI/266/HART-EN Rev. D | 2600T Series Pressure transmitters
266 Models - HART
In case the tests would fail the transmitter will drive the output to the alarm values. In this case a correction action consists in the
re-calibration of the D/A converter. In case the normal functionality will be not re-established, the transmitter shall be considered
failed and not possible to use.
Safety-related parameters
The Safety 266 pressure transmitters product meets the SIL2 requirements of IEC 61508 in low as well as high demand mode of
operation. The total PFD in low demand mode for 10 years proof test interval in the worst case is less than the 15% of the range
defined in IEC 61508-1. The relevant numbers are stated in the table below:
266DXX, 266VXX,
266PXX, 266HXX,
266NXX
266MXX, 266CXX,
266JXX, 266RXX
(range R)
266MXX, 266CXX,
266JXX, 266RXX
(except range R)
266GXX, 266AXX
(except range C and F)
266GXX, 266AXX
(only range C and F)
λdd 2,62E-07 3,50E-07 3,94E-07 4,05E-07 4,13E-07
λdu 6,82E-08 4,10E-08 6,85E-08 6,85E-08 6,90E-08
λsd 3,37E-07 1,50E-08 2,39E-07 2,40E-07 2,40E-07
λsu 3,01E-07 1,42E-07 3,53E-07 3,42E-07 3,18E-07
HFT - - - - -
T1 1 year / 10 years (8760h / 87600h)
SFF 92,95% 93,63% 93,51% 93,51% 93,37%
Total Failure Rate 9,68E-07 1,08E-06 1,06E-06 1,06E-06 1,04E-06
MTBF 118 106 108 108 110
MTTR 8 hours
DC D: 79% D: 86% D: 85% D: 86% D: 86%
C: 53% C: 41% C: 40% C: 41% C: 43%
PFD (1 year) 2,99E-04 3,01E-04 3,00E-04 3,00E-04 3,02E-04
PFH (1 year) 6,82E-08 6,87E-08 6,85E-08 6,85E-08 6,90E-08
PFD (10 years) 2,98E-03 3,00E-03 2,99E-03 2,99E-03 3,01E-03
PFH (10 years) 6,82E-08 6,87E-08 6,85E-08 6,85E-08 6,90E-08
Testing time < 20 s < 20 s < 20 s < 5 s < 70 s
ROM check time < 30 s < 30 s < 30 s < 30 s < 70 s
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