Emerson Rosemount 2410 - Introduction; Purpose of the Product; Assumptions and Restrictions

2
Safety Manual
00809-0400-5100, Rev AB
Safety Instrumented System
November 2019
Safety Instrumented System
1.2 Introduction
The purpose of the safety manual is to document all the information, relating to the
Rosemount Tank Gauging system, which is required to enable integration into a
safety-related system, in compliance with the requirements of IEC 61508.
1.2.1 Purpose of the product
The Rosemount
™
Tank Gauging Safety System is designed for high performance level
gauging in various types of storage tanks. It measures the distance to a liquid in a tank for
Safety Instrumented Systems. Two relays and one 4-20 mA analog output are available for
alarm indication and overfill and dry run risk. Non safety-related instruments such as level
transmitters, temperature sensors, remote display units, water level sensors, pressure
sensors, and other instruments can be connected.
The Rosemount Tank Gauging Safety System is intended for use as a level measurement
sensor in safety instrumented functions (SIF) designed per IEC 61511. It is comprised of the
following main elements:
Rosemount 5900
The Rosemount 5900 is a radar level gauge developed for a wide range of applications at
bulk liquid storage facilities. Different antennas can be used in order to meet the
requirements of different applications. The 2-in-1 version of the Rosemount 5900 has two
independent and galvanically isolated radar modules in the same transmitter enclosure
using a single antenna.
Rosemount 2410
The Rosemount 2410 acts as a power supply to the connected Rosemount 5900 using the
intrinsically safe Tankbus. The Rosemount 2410 provides the analog 4-20 mA outputs and
relay output and digital communication allowing connection of configuration tools or
safety control system.
1.2.2 Assumptions and restrictions
Note that the Rosemount 5900 is not safety-rated during maintenance work, configuration
changes, or other activity that affects the Safety Function. Alternative means should be
used to ensure process safety during such activities.
False echoes within the radar beam from flat obstructions with a sharp edge may lead to a
situation where the Rosemount 5900 can no longer be used for safety related functions
with the listed failure rates, Safe Failure Fraction and PFD
AVG
. However, reduced proof test
intervals can help to detect such unwanted causes.