Safety Instrumented Systems (Sis) Requirements; Sis Certification; Identify Safety Certification; Installation - Emerson Rosemount 248 Reference Manual

Reference Manual
00809-0100-4825
5 Safety Instrumented Systems (SIS)
Requirements
5.1

SIS certification

The safety-critical output of the Rosemount
through a two-wire, 4-20 mA signal representing temperature. The Rosemount 248 Safety
Certified Safety Transmitter is certified to: Low demand; Type B. The 248 does not provide
and measures against cybersecurity threaths or vulnerabilities.
• SIL 2 for random integrity at HFT=0
• SIL 3 for random integrity at HFT=1
• SIL 3 for systematic integrity
5.2

Identify safety certification

All Rosemount 248 HART
installing into SIS systems. To identify a safety certified Rosemount 248 Transmitter, make
sure the device satisfies the requirements below:
1. Verify the transmitter was ordered with transmitter type option code "H" and option
2. Devices used in safety applications with ambient temperature below –40 °F (–40 °C)
3. Check the Namur Software Revision located on the adhesive transmitter tag. "SW
5.3

Installation

Installation are to be performed by qualified personnel. No special installation is required
in addition to the standard installation practices outlined in this document. Always ensure
a proper seal by installing the electronics housing cover(s) so that metal contacts metal.
The loop should be designed so the terminal voltage does not drop below 12Vdc when the
transmitter output is 24.5 mA.
Environmental limits are available on the
Product Page.
Rosemount 248 Temperature Transmitter Reference Manual
®
Transmitters must be indentified as safety certified before
code "QT". This signifies that it is a 4–20mA/HART safety certified device.
a. For example: MODEL 248HA......QT.......
requires option code QT, and BR5 or BR6.
Rev _._._".
If the Device label software revision is 1.0.2 or higher, the device is safety certified.

Safety Instrumented Systems (SIS) Requirements

™
248 Temperature Transmitter is provided
Rosemount 248 Temperature Transmitter
May 2019
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