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Reference Manual
IP2048/RM, Rev AA
Appendix F: Configuring Using HART
February 2015
F.4.9 Echo success (D912)
This is a measure of the quality of the echo returned. It is a percentage indicating the success
rate achieved from the last ten pulse transmissions.
The success rate may fall below 100% due to the effect of extreme surface turbulence or stirrers,
which might return a surface echo that is then rejected by the transmitter.
A surface echo might be rejected because it is outside the allowed 'window', set-up to establish
the true liquid level. This rejects invalid readings on the principle that liquid levels do not change
very quickly (see “Lost Echo Delay” on page 128).
One rejected surface echo causes Echo Success to decrease by 10%, but a subsequent valid
surface echo increases the percentage by 10%. The transmitter is biased to ignore sudden liquid
level changes.
Field Communicator
To view the echo success:
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 3: Success Rate D912.
6. When finished, press EXIT to exit to the previous menu.
Mobrey MCU900 Series control unit
To view the echo success:
1. From the Main Menu screen, select MONITOR.
2. Select the transmitter (e.g. “Tx1:MSP400RH”).
3. Select DIAGNOSTICS
4. Select Echo Success.
5. When finished, press the ESC key to exit to the previous menu.
Fast Keys
3, 1, 2, 1, 3
Success Rate D912
100 %
EXIT
HELP
(Field Communicator Screen)
Echo Success D912
100%
(Mobrey MCU901 Screen)