BENTLY 3500/40M Vibration displacement monitoring module

Description

3500/40M The calculation of the 3500/32M_SIL1 and 3500/33_SIL1 Relay Modules safety relevant

parameters has shown that the requirements of SIL 1 to IEC 61508: 2010 are fulfilled in a 1oo1

configuration.

The component level FMEDA was carried out by TÜV Rheinland under 3500/40M consideration to the

requirements of IEC 61508, parts 1-7:2010. Component failure rates were based on SN 29500, with

a maximum ambient temperature of 65°C

3500/40M The safety related parameters are as follows:

l The relay channel must be configured for de-energize to trip.

l The safety-related circuit must be set up such that the opening of the relay contacts

activates the safety function (de-energize circuit to trip) as shown in figure 4-1.

l Average probability of a dangerous 3500/40M failure on demand (PFD) < 10 E-1.

l The 3500/32M_SIL and 3500/33_SIL modules are considered to be a system operating in a

low demand mode.

l The 3500/32M_SIL and 3500/33_SIL modules have a hardware safety integrity route of 1H.

l The 3500/32M_SIL and 3500/33_SIL modules have a systematic safety Integrity route of 1S.

l The rated life time of the 3500/32M_SIL and 3500/33_SIL modules is 10 years.

l The 3500/32M_SIL and 3500/32_SIL Relay Controller Module are Type B safety related

elements with a Safe Failure Fraction (SFF) of 60% to <90%.

l The 3500/32M_SIL and 3500/32_SIL Relay Output Modules are 3500/40M Type A safety related

elements with a Safe Failure Fraction (SFF) of <60%.

l The 3500/32M_SIL and 3500/33_SIL modules have a Hardware Fault Tolerance (HFT) of 0

when used in a 1oo1 configuration.

l The MTTR and MRT forthe 3500/32M_SIL and 3500/33_SIL modules is 168 hours or 1

week**.

**MTTR and MRT were assigned as 168 hours forthe purposes of generating the PFDAVE

calculation. This figure may be adjusted to suit application specific considerations as long as the

specific value is also used to adjust the PFDAVE calculation specific to the safety-related

installation.

As shown in the safety block diagram, Figure 4-2, the 3500/32M and 3500/33 Relay Controller

Modules are classified as Type B devices, and the 3500/32 and 3500/33 Relay Output Modules are

Type A. The failure rates when used in the 1oo1 configuration are shown in Table 4-1. These

failure rates are based on the 1oo1 safety block diagram in Figure 4-2.

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