Overview - Emerson Rosemount 3051S Series Reference Manual

Advanced HART Diagnostic Suite
October 2018
Typical applications for the Plugged Impulse Line diagnostic include detecting abnormal process
connection conditions, such as:
Plugged impulse lines

Process leaks

Coated or plugged Rosemount Annubar

In the following sections, all references to Process Intelligence also apply to the Plugged Impulse Line
diagnostic.
7.3.2

Overview

A block diagram of the Process Intelligence and Plugged Impulse Line diagnostics diagnostic is shown in
Figure
pass filtering is performed on the pressure signal. The mean (or average) is calculated on the unfiltered
pressure signal, the standard deviation calculated from the filtered pressure signal. These statistical
values are available via HART and handheld communication devices like the Field Communicator or asset
management software like Emerson's AMS Device Manager. The values can also be assigned as
secondary variables from the device for 4–20 mA communication to the user through other devices like
the Rosemount 333 HART Tri-Loop or wirelessly through the Emerson
Figure 7-4. Statistical Processing Technology Resident in Transmitter
Process
Variable
Process Intelligence and Plugged Impulse Line diagnostics also contains a learning module that
establishes the baseline values for the process. Baseline values are established under user control at
conditions considered normal for the process and installation. These baseline values are made available
to a decision module that compares the baseline values to the most current statistical values. Based on
sensitivity settings and actions selected by the user via the control input, the diagnostic generates
alarms, alerts, or takes other actions when a significant change is detected in either value.
106
7-4. The pressure process variable is input to a statistical calculations module where basic high
Statistical
Calculations
Module
Resident in Transmitter
™
Learning
Module
Baseline
Values
Decision
Module
Statistical Parameters
Reference Manual
00809-0100-4801, Rev HA
Wireless 775 THUM Adapter.
Standard Outputs
(4-20 mA/ HART)
Control Inputs
HART alert /
4-20 mA alarm
Outputs
Advanced HART Diagnostic Suite