Emerson Rosemount 3101, Reference Manual

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64
Reference Manual
00809-0100-4840, Rev CB
Section 5: Service and Troubleshooting
February 2015
Service and Troubleshooting
5.5.3 Setting lost echo time (on the 3102/3105)
Screen display: LE
Default: 900
The lost echo time is the seconds that the transmitter will wait before taking the lost echo
action (see
“Selecting the Lost Echo action (on the 3102/3105)” on page 51 ).
A value up to 9999 can be entered. It is recommended that the lost echo time remains set to
900 seconds to avoid false trips and fault/alarm indication from a temporary loss of echo caused
by transient poor surface conditions.
A lower lost echo time should only be programmed if it is important that the lost echo action is
taken more quickly.
Note
This menu option is in the engineering menu “Eng”. See “Accessing the engineering menu (on
the 3102/3105)” on page 62 or see Figure C-5 on page 106 for a map of the menu structure.
To change the lost echo time
1. After entering the “Eng” menu (see the note above), press the green button

repeatedly until “LE” is indicated.
2. Press the blue button

to enter the menu for “LE”. The display indicates the present
lost echo time value.
3. If this lost echo time is correct, press the red button

and then press the green button

to get to the next menu option. Otherwise, continue with step ( 4 ).
4. Press the blue button

to start the editing mode. The first digit flashes to indicate it
can now be edited.
5. Press the green button

repeatedly to edit the flashing digit.
6. Press the blue button

to move to the next digit. The digit flashes to indicate it can be
edited.
7. Repeat steps ( 5 ) and ( 6 ) until the last digit is flashing, and edited as required.
8. Press the blue button

to confirm the new value. (The flashing stops).
9. Press the red button

to save the new value if it is correct, or press the blue button

to
not save. Afterwards, depending on the button pressed, either the “LE” menu or the
next menu appears.