Emerson Rosemount 5408 Reference Manual page 248

Configuration Parameters
User defined antenna options
Parameters for user defined antenna. These settings are typically provided by factory and
should only be modified for customized antennas.
When a Rosemount 5408 transmitter head is mounted on a Rosemount 5402 antenna,
refer to
Table C-3: Rosemount 5402 Antenna Parameters, Free Propagation
Antenna type
2-in. cone, 316L SST (EN
1.4404)
2-in. cone, Alloy C-276 or
Alloy 400
2-in. process seal
3-in. cone, 316L SST (EN
1.4404)
3-in. cone, Alloy C-276 or
Alloy 400
3-in. process seal
4-in. cone, 316L SST (EN
1.4404)
4-in. cone, Alloy C-276 or
Alloy 400
4-in. process seal
(1) Default setting. The Upper Null Zone may need to be increased if there are disturbance echoes in the region close to the antenna.
Table C-4: Rosemount 5402 Antenna Parameters, Still Pipe/Chamber Installation
Antenna type
2-in. cone, 316L SST (EN
1.4404)
2-in. cone, Alloy C-276
or Alloy 400
2-in. process seal
3-in. cone, 316L SST (EN
1.4404)
3-in. cone, Alloy C-276
or Alloy 400
238
Table C-3 and Table C-4
Tank connection
length
ft m
0.509 0.155
0.509 0.155
0.929 0.283
0.509 0.155
0.509 0.155
1.191 0.363
0.509 0.155
0.509 0.155
1.316 0.401
Tank connection
length
Antenna
ft m gain
0.509 0.155 0.035
0.509 0.155 0.035
0.929 0.283 0.035
0.509 0.155 0.035
0.509 0.155 0.035
for antenna parameters.
Nearzone
Antenna threshold
gain (mV)
2.45 4500
2.45 5000
3.4 3400
1.4 1170
1.4 4400
1.7 3400
0.9 1170
0.9 2400
0.8 1000
Nearzone
threshold
(mV)
800
900
930
800
1100
Nearzone range Upper null zone
ft m ft
5.09 1.55 0.541
5.25 1.60 0.492
4.13 1.26 0.492
3.38 1.03 0.492
5.41 1.65 0.591
4.13 1.26 0.492
3.38 1.03 0.738
4.27 1.30 0.820
3.48 1.06 0.492
Nearzone range Upper null zone
ft m ft
2.03 0.62 0.541
3.28 1.00 0.492
2.56 0.78 0.492
2.03 0.62 0.492
4.27 1.30 0.591
Reference Manual
(1)
m
0.165
0.150
0.150
0.150
0.180
0.150
0.225
0.250
0.150
(1)
m
0.165
0.150
0.150
0.150
0.180