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Reference Manual
IP2048/RM, Rev AA
Appendix F: Configuring Using HART
February 2015
F.3.8 Lower blanking (P063)
This defines a zone above the Bottom Reference (page 105) 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.
Note
See Figure F-1 on page 106 for this zone in a tank geometry illustration.
The pulses transmission stops if the sum of the Upper Blanking (page 131) and
Lower Blanking is greater than the Bottom Reference (page 105).
Field Communicator
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 (MSP900GH)
or 6: Engineering (MSP400RH).
4. Select 6: Lower Blanking.
5. If a change is required:
(a) Input the new blanking distance, and press “ENTER” to save it.
(b) Press “SEND” to update the transmitter.
Note
When messages appear, take appropriate action if needed and press “OK”.
Mobrey MCU900 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: MSP400RH”).
3. Select ENGINEERING.
4. Select Lower Blanking.
5. Follow the on-screen instructions to edit and save the new setting.
(Press 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)
Lower Blanking P063
0.000ft
Esc=Quit =Edit
(Mobrey MCU901 Screen)