Operating Manual Owner manual

Table Of Contents

6 Safety Manual

2013-04-01

6.8.2 Failure rates and SFF for type 701155/X-XX-025X-XXXX-25 (AC/DC 24 V)

Important information:

Variants 1 to 4 were evaluated with JUMO probes according to data sheets 901006 and 902006.

For variant 5 no sensor system was included (only the JUMO safetyM STB/STW Ex).

In this case, the plant operator selects the sensor system.

The PFH and PFD

avg

values were calculated with the assumption that the time to restore the system is 8 h (MTTR = 72 h). Fur-

thermore, the calculation was based on a lifetime of 10 years (T

= 10 y). The Common Cause Factor was determined accord-

ing to the tables of DIN EN 61508 for sensor systems and logic.

Table 5:

Variant

[Fit]

SFF

PFH (1/h)

PFD

avg

1 919.23 306.82 34.24 96 % 7.22 e

-9

3.19 e

-4

1a 919.23 306.82 34.24 96 % 3.71 e

-9

1.63 e

-4

2 886.19 303.86 34.24 96 % 3.71 e

-9

1.63 e

-4

3 947.18 325.86 37.89 96 % 3.75 e

-9

1.64 e

-4

4 953.24 350.21 40.59 96 % 3.85 e

-9

1.69 e

-4

5 938.89 323.57 36.89 96 % 3.68 e

-9

1.61 e

-4