Bently Nevada 3500/45 135137-01 SIL Functional Redundant Sensors

Description

3500/45 135137-01 For hardware assessment according to IEC 61508 only random equipment
failures are of interest. It is assumed that the equipment has been properly
selected for the application and is adequately commissioned such that early life
failures (infant mortality) may be excluded from the analysis. The assumption is
also made that the equipment is maintained per the requirements of IEC 61511
and therefore a preventative maintenance program is in place to replace
equipment before the end of its “useful life”.

The 3500/45 135137-01 failure rates in Table 11-5 are valid for the useful lifetime of the product. The
components that contribute to the dangerous undetected failure rate and
therefore to the PFDavg calculation are electrolytic capacitors and the hazardous
gas sensors themselves. The capacitors have an estimated useful lifetime of
approximately 10 years. Therefore, the 3500/63 monitor and the 3500/33 relay
cards shall be replaced every 10 years.

The life of the sensor depends on its years in service and whether it has been
exposed to gases or poisons. A sensor should be replaced when it cannot be
recalibrated or at least every 5 years.

Outputs through a 3500/92 Communication Gateway or 3500/91 EGD module
are not covered in this SIL certification. The SIL suitability rating covers only
outputs in the form of the analog outputs per channel on the 3500/63
Hazardous Gas Detection Module and/or the outputs of the 3500/33 Relay
module channels.

The BN Hazardous Gas Protection System affords safety benefits from automatic
diagnostic testing as well as prescribed periodic proof testing. The BN 350800
sensor requires periodic calibration and proof testing. The proof test interval
required for the sensor/channel to maintain SIL2 suitability is 90 days based on
sensor technology. The user may wish to use the Cal Status value (see Section
6.2.1) provided by each channel to ensure that he prepares for and meets the 90-
day recalibration requirement. To perform the 90-day proof test for the
sensor/channel recalibrate and verify the channel per Section 8.

Additionally, the user should determine the proof test interval required for the 4-
20mA outputs if those are used as part of the safety system. Refer to Section 9.1.6
for instructions on verifying the 4-20mA outputs from the BN system.
The user should determine the proof test interval required for the relay outputs if
the 3500/33 Relay Module is used as part of the safety system. Refer to Section
9.1.4 for testing alarms and to Section 9.1.5 for testing OK statuses if alarm limits
and OK statuses are part of the relay voting logic. Refer also to the 3500/33 Relay
Module Operations and Maintenance Manual, part number 162291-01.

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135785-01 3500/93 Display Unit, non backlighted
135785-02 3500/93 Display Unit, back-lighted
137412-01 3500/93 Manual
135799-01 3500/93 Display Interface Module
135799-02 3500/93 Display Interface Module
(use with A05 option only)
135813-01 3500/93 Display Interface I/O
Module
136634-0010-01 10 Foot (3 metres) Cable (PVC)
136634-0050-01 50 Foot (15 metres) Cable (PVC)
136634-0050-02 50 Foot (15 metres) Cable
(Teflon? )
136634-0100-01 100 Foot (30 metres) Cable (PVC)
136634-0100-02 100 Foot (30 metres) Cable
(Teflon? )
130121-02-01 500 Foot (152 metres) Extension
Cable (PVC)
130121-02-02 500 Foot (152 metres) Extension
Cable (Teflon? )
02200271 External Power Supply for 115 Vac
02200272 External Power Supply for 230 Vac
138227-01 Cable Adapter
146085-01 Power Cable
137224-01 System Mounting Assembly
(sheet metal for A01 & A05
options)
04309007 4-40 X 0.63 Phillips head screw for
System Mounting Assembly, 4 are
required