![Emerson Rosemount 5408 Reference Manual Download Page 133](http://html.mh-extra.com/html/emerson/rosemount-5408/rosemount-5408_reference-manual_103670133.webp)
Change the upper null zone
The Upper Null Zone defines a zone close to the transmitter where echoes are ignored.
This zone can be extended to block out disturbing echoes at the top of the tank.
Prerequisites
Note
Make sure the Upper Range Value (100%/20 mA) value is below the Upper Null Zone.
Measurements are not performed within the Upper Null Zone.
Procedure
1. Identify desired Upper Null Zone using the echo curve plot.
a) In Rosemount Radar Master Plus, start the echo curve reading, see
.
b) View the echo curve plot to find out if there are disturbing echoes close to
the transmitter.
2. Set the desired Upper Null Zone value.
a) Under
Configure
, select
Level Setup
→
Antenna
.
b) Under
Advanced
, type desired Upper Null Zone, and then select
Save
.
Figure 7-10: Upper Null Zone
A
100% (20 mA)
B
D
meter
0
6 000
7 000
mV
0.5
1.0
1.5
2.0
2.5
3.0
0
1 000
2 000
3 000
4 000
5 000
C
A. Upper Null Zone
B. Disturbance echo
C. Amplitude threshold
D. Product surface echo
Reference Manual
Service and troubleshooting
00809-0100-4408
February 2020
Rosemount 5408 and 5408:SIS Level Transmitters
133
Summary of Contents for Rosemount 5408
Page 4: ...4 ...
Page 8: ...Contents Reference Manual February 2020 00809 0100 4408 viii Reference Manual ...
Page 10: ...Introduction Reference Manual February 2020 00809 0100 4408 10 Reference Manual ...
Page 20: ...Transmitter overview Reference Manual February 2020 00809 0100 4408 20 Reference Manual ...
Page 72: ...Mechanical installation Reference Manual February 2020 00809 0100 4408 72 Reference Manual ...
Page 100: ...Operation Reference Manual February 2020 00809 0100 4408 100 Reference Manual ...
Page 240: ...Product certifications Reference Manual February 2020 00809 0100 4408 240 Reference Manual ...
Page 242: ...Product certifications Reference Manual February 2020 00809 0100 4408 242 Reference Manual ...
Page 244: ...Product certifications Reference Manual February 2020 00809 0100 4408 244 Reference Manual ...
Page 246: ...Product certifications Reference Manual February 2020 00809 0100 4408 246 Reference Manual ...
Page 248: ...Product certifications Reference Manual February 2020 00809 0100 4408 248 Reference Manual ...