182
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.3.36 Threshold 1 size (P048)
False echoes may occur close to the transmitter face. If they occur outside the Upper Blanking
distance (page 174), the false echo can be ignored by entering the echo size as a percentage and
a time (representing distance). The echo size is set by the parameter Threshold 1 Size (P048).
See "Threshold 1 time (P043)" on page 181 for entering the time (representing distance).
Note
Use the read-only parameter Echo Size (page 200) as a reference for the false echo size.
See also "False echoes under certain ambient operating conditions (on the 3102/3105)" on page
75 for additional information about adjusting the settings of parameters P043 and P048.
Field Communicator or AMS Device
Manager
To view or change the threshold size
1. From the Home screen, select 2: Configure.
2. Select 2: Manual Setup.
3. Select 7: Advanced Processing (3105) or
Select 8: Advanced Processing (3102)
4. Select 2: Threshold.
5. Select 7: Threshold 1 Size P048.
6. If a change is required:
(a) Input a new value, and then select “ENTER” to save it.
(b) Select “Send” or “Apply” to update the transmitter.
Rosemount 3490 Series Control Unit
To view or change the threshold size
1. From the Main Menu screen, select SETUP.
2. Select the transmitter (e.g. “Tx1: 3102”).
3. Select ENGINEERING.
4. Select ADVANCED.
5. Select Thresh 1 Size.
6. Follow the on-screen instructions to edit and save the new setting.
(Use the Enter ( ) key if prompted to change the mode to “off-line”).
7. Select “Quit” to exit to the previous menu.
Fast Keys
2, 2, 7 [or 8], 2, 7
Threshold 1 Size P048
6.0 %
6.0
ESC
DEL ENTER
HELP
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FN
(Field Communicator Screen Shown)
Thresh 1 Size P048
6.0%
Esc=Quit =Edit
(Rosemount 3491 Screen Shown)
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