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Reference Manual
00809-0100-4840, Rev CB
Appendix F: Programming the 3102 and 3105 using HART
February 2015
Programming the 3102 and 3105 using HART
F.3.34 Echoes needed (P042)
Echoes Needed is used to avoid stirrers that give occasional high level signals when they
protrude from the liquid surface. The transmitter monitors the echoes returned from the liquid
surface or any other target within range.
A valid surface echo is one that exceeds the signal strength threshold consecutively for more
ultrasonic pulse cycles than set by Echoes Needed.
This parameter is not available in the 3100 Series DD (Device Descriptor) file. However, it can be
adjusted using the integral buttons (see "Setting valid echo count (on the 3102/3105)" on page 68).
Rosemount 3490 Series Control Unit
To view or change the number of echoes
needed
1. From the Main Menu screen, select SETUP.
2. Select the transmitter (e.g. “Tx1: 3102”).
3. Select ENGINEERING, and then select ADVANCED.
4. Select Echoes Needed.
5. Follow the on-screen instructions to edit and save the new setting.
(Use the Enter ( ) key if prompted to change mode to “off-line”).
6. Select “Quit” to exit to the previous menu.
Fast Keys
–
Echoes Needed P042
4
Esc=Quit =Edit
(Rosemount 3491 Screen Shown)
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