68
Reference Manual
00809-0200-4840, Rev BA
December 2014
Section 4: Configuration
Field Communicator or AMS
This parameter is not available in the 3100 Series DD (Device Descriptor) file.
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: 3107
”).
3.
Select
ENGINEERING
.
4.
Select
ADVANCED
.
5.
Select
Echoes Needed
.
6.
Follow the on-screen instructions to edit and save the new setting.
(Press the
Enter
(
) key if prompted to change the mode to “off-line”).
7.
Select “
Quit
” to exit to the previous menu.
4.3.29
Threshold 1 time (P043)
False echoes may occur close to the transmitter face. If they occur outside the
Upper Blanking
distance (
), the false echo can be ignored by entering the
echo size
as a percentage and a
duration
(representing distance) for how long this
echo size
should be ignored.
Enter the
duration
(representing distance) into the parameter
Threshold 1 Time
(
P043
). For
example, 6 ms represents an approximate distance of 1 m, and 2 ms represents a distance of
approximately 1 ft.
See
“Threshold 1 size (P048)” on page 69
for entering the
echo size
.
Field Communicator or AMS
To view or change the threshold time:
1.
From the
Home
screen, select
2: Configure
.
2.
Select
2: Manual Setup
.
3.
Select
7: Advanced Processing
.
4.
Select
2: Threshold
.
5.
Select
6: Threshold 1 Time P043
.
6.
Input a new value, and then select “
ENTER
” to save it.
7.
Press “
SEND
” to update the transmitter.
Fast Keys
2, 2, 7, 2, 6
Echoes Needed P042
4
Esc=Quit =Edit
(Rosemount 3491 Screen)
Threshold 1 Time P043
2.9 ms
2.9
ESC
DEL
ENTER
HELP
w
s
q
a
z
Lock
Shift
@ &
á ü
x
e
d
c
r
f
v
t
g
b
y
h
n
u
j
m
*
-
+
/
.
0
7
4
1
8
5
2
9
6
3
i
k
o
l
FN
(Field Communicator Screen)
Summary of Contents for 3107
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