140
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.3.8 Lower blanking (P063)
This defines a zone above the Transmitter Bottom Reference (page 136) where echoes are to be
ignored. This zone eliminates echoes from false targets at the tank bottom e.g. pumps
uncovered as the liquid level decreases. See Figure F-1 on page 137 for this zone in a tank
geometry illustration.
Note
The pulses transmission stops if the sum of the Upper Blanking (page 174) and
Lower Blanking is greater than the Transmitter Bottom Reference (page 136).
Field Communicator or AMS Device
Manager
To view or change the lower blanking
distance
1. From the Home screen, select 2: Configure.
2. Select 2: Manual Setup.
3. Select 5: Engineering (3105) or
6: Engineering (3102).
4. Select 6: Lower Blanking.
5. If a change is required:
(a) Input the new blanking distance, and select “ENTER” to save it.
(b) Select “Send” or “Apply” to update the transmitter.
Note
When messages appear, take appropriate action if needed and select “OK”.
Rosemount 3490 Series Control Unit
To view or change the lower blanking
distance
1. From the Main Menu screen, select SETUP.
2. Select the transmitter (e.g. “Tx1: 3102”).
3. Select ENGINEERING.
4. Select Lower Blanking.
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
2, 2, 5 [or 6], 6
Lower Blanking P063
0.000 ft
0.000 ft
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 Shown)
Lower Blanking P063
0.000ft
Esc=Quit =Edit
(Rosemount 3491 Screen Shown)
To Next Page
Loading...
Need help?
General
