Emerson Rosemount 5400 Series - Overview; Applicable Models

168
Reference Manual
00809-0100-4026, Rev HA
Section 8: Safety Instrumented Systems (4-20 mA Only)
November 2014
Safety Instrumented Systems (4-20 mA Only)
8.2 Overview
The following section applies to the 4-20 mA Rosemount 5400 Series with QS Prior-Use
Certificate of FMEDA data transmitter used in Safety Instrumented Systems (SIS) applications.
The 5400 QS Prior Use option with analog output provides overfill and empty tank protection to
improve the system safety. The transmitter is classified as a Type B device. It contains self-diag-
nostics and is programmed to send its output to either a high or low failure state upon internal
detection of a failure.
An independent third party approval of the FMEDA (detailed performance assessment) was
conducted by SP (Technical Research Institute of Sweden) according to IEC 61508:2010. The
FMEDA is performed to determine failure rates, calculate the Safe Failure Fraction (SFF), and the
average Probability of Failure on Demand (PFD
AVG
). The hardware assessment is one of the steps
taken to achieve functional safety per IEC 61508 / IEC 61511. It provides the failure rate data
suitable for prior-use assessment.
Note
Refer to the Rosemount 5400 Series FMEDA
(1)
report for failure rate data, additional details, and
assumptions regarding the failure rate analysis.
8.2.1 Applicable models
Tabl e 8 -1 lists the versions of the Rosemount 5400 Series transmitter that have been considered
for the hardware assessment, to which this section applies.
Table 8-1. Rosemount 5400 Series QS Option Model Codes
To identify a 5400 QS Prior Use transmitter, verify the option code QS in the model code, on the
label affixed to the outside of the transmitter head.
Any substitution of non-authorized parts or repair, other than exchanging the complete
transmitter head or antenna assembly, may jeopardize safety and is prohibited.
Unauthorized changes to the product are strictly prohibited as they may unintentionally
and unpredictably alter performance and jeopardize safety. Unauthorized changes that
interfere with the integrity of the welds or flanges, such as making additional perforations,
compromise product integrity and safety. Equipment ratings and certifications are no
longer valid on any products that have been damaged or modified without the prior written
permission of Emerson Process Management. Any continued use of product that has been
damaged or modified without the written authorization is at the customer’s sole risk and
expense.
(1) The Rosemount 5400 Series FMEDA report is accessible at www.emersonprocess.com/rosemount/safety/PriorUse.htm.
QS option model codes
1 Model 5401xHxxxxxxxxxxxxQS
(1)
(1) Not available with option code C4 or C8.
2 Model 5402xHxxxxxxxxxxxxQS
(1)