Configuration - Emerson Rosemount 644 Reference Manual

Safety Instrumented Systems (SIS) Certification
March 2021
7.4

Configuration

Use any HART-capable configuration tool or the optional Local Operator Interface (LOI) to
communicate with and verify the initial configuration or any configuration changes made
to the transmitter prior to operating in Safety Mode. All configuration methods outlined in
Configuration
Software lock must be used in order to prevent unwanted changes to the transmitter
configuration.
Note
Transmitter output is not safety-rated during the following: Configuration changes,
Multidrop operation, Simulation, Active calibrator mode, and loop tests. Alternative
means should be used to ensure process safety during transmitter configuration and
maintenance activities.
7.4.1 Damping
User-adjustable damping affects the transmitter's ability to respond to changes in the
applied process. The damping value + response time should not exceed the loop
requirements.
If using a thermowell assembly, ensure to also take into account the added response time
due to thermowell material.
7.4.2 Alarm and saturation levels
DCS or safety logic solver should be configured to match transmitter configuration.
7-1 identifies the three alarm levels available and their operations values.
Figure 7-1: Alarm Levels
Rosemount alarm level
Namur alarm level
108
are the same for the safety-certified transmitter with any differences noted.
(1)(2)
(1)(2)
Reference Manual
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Figure
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