91
Reference Manual
00809-0200-4840, Rev BA
Section 5: Service and Troubleshooting
December 2014
Section 5: Service and Troubleshooting
5.5.8
Echo size (D911)
The size of the echo returned from a surface depends on the surface range, gas composition and
temperature, transmitter performance, in-tank conditions (turbulence, presence of surface
foam, and draughts), and other factors.
The received echo strength may vary from pulse-to-pulse but monitoring the read-only
parameter Echo Size (D911) indicates the latest echo strengths.
The indicated value is an averaged percentage of the last five echoes, with 100% representing a
saturated returned signal.
Field Communicator or AMS
To view the echo strength:
1.
From the
Home
screen, select 3: Service Tools.
2.
Select 1: Alerts.
3.
Select 2: Diagnostic Data.
4.
Select 1: Target Data.
5.
Select 2: Echo Size D911.
6.
When finished, press EXIT to exit to the previous menu.
Rosemount 3490 Series Control Unit
To view the echo strength:
1.
From the
Main Menu
screen, select MONITOR.
2.
Select the transmitter (e.g. “
Tx1: 3107
”).
3.
Select DIAGNOSTICS
4.
Select Echo Size.
5.
When finished, press the ESC key to exit to the previous menu.
Fast Keys
3, 1, 2, 1, 2
Echo Size D911
53 %
EXIT
HELP
(Field Communicator Screen)
Echo Size D911
75%
(Rosemount 3491 Screen)
Содержание 3107
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