Safety-Related Parameters - ABB 266 HART Operating Instruction

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
λ
dd 2,62E-07
λ
du
6,82E-08
λ
sd
3,37E-07
λ
su
3,01E-07
HFT -
T1
SFF
92,95%
Total Failure Rate
9,68E-07
MTBF
118
MTTR
DC D: 79%
C: 53%
PFD (1 year)
2,99E-04
PFH (1 year)
6,82E-08
PFD (10 years)
2,98E-03
PFH (10 years)
6,82E-08
Testing time < 20 s
ROM check time < 30 s
74 OI/266/HART-EN Rev. D | 2600T Series Pressure transmitters
266MXX, 266CXX, 266MXX, 266CXX,
266JXX, 266RXX 266JXX, 266RXX
(range R) (except range R)
3,50E-07 3,94E-07
4,10E-08 6,85E-08
1,50E-08 2,39E-07
1,42E-07 3,53E-07
- -
1 year / 10 years (8760h / 87600h)
93,63% 93,51%
1,08E-06 1,06E-06
106 108
D: 86% D: 85%
C: 41% C: 40%
3,01E-04 3,00E-04
6,87E-08 6,85E-08
3,00E-03 2,99E-03
6,87E-08 6,85E-08
< 20 s < 20 s
< 30 s < 30 s
266GXX, 266AXX
(except range C and F)
4,05E-07
6,85E-08
2,40E-07
3,42E-07
-
93,51%
1,06E-06
108
8 hours
D: 86%
C: 41%
3,00E-04
6,85E-08
2,99E-03
6,85E-08
< 5 s
< 30 s
266GXX, 266AXX
(only range C and F)
4,13E-07
6,90E-08
2,40E-07
3,18E-07
-
93,37%
1,04E-06
110
D: 86%
C: 43%
3,02E-04
6,90E-08
3,01E-03
6,90E-08
< 70 s
< 70 s