Emerson Rosemount Apex - Page 24

Reference Manual
00809-0100-4731, Rev FA
April 2003
APEX
™
and APEX Sentry
™
Radar Gauge
2-8
Table 2-2. Beamwidth versus
Distance from flange face
to tank bottom
Distance (D)
from gauge
Radius (r) from Flange Centerline to
Beamwidth Edge
2-in. Antenna 3-in. Antenna 4-in. Antenna
ft (m) ft (m) ft (m) ft (m)
2 (0.6) 0.4 (0.12) 0.2 (0.07) 0.2 (0.06)
4 (1.2) 0.8 (0.25) 0.5 (0.15) 0.4 (0.11)
6 (1.8) 1.2 (0.37) 0.7 (0.22) 0.6 (0.17)
8 (2.4) 1.6 (0.49) 1.0 (0.29) 0.7 (0.22)
10 (3.0) 2.0 (0.62) 1.2 (0.37) 0.9 (0.28)
15 (4.6) 3.0 (0.93) 1.8 (0.55) 1.4 (0.42)
20 (6.1) 4.1 (1.23) 2.4 (0.73) 1.8 (0.56)
25 (7.6) 5.1 (1.54) 3.0 (0.92) 2.3 (0.70)
30 (9.1) 6.1 (1.85) 3.6 (1.10) 2.8 (0.84)
35 (10.7) 7.1 (2.16) 4.2 (1.28) 3.2 (0.98)
40 (12.2) 8.1 (2.47) 4.8 (1.46) 3.7 (1.12)
45 (13.7) 9.1 (2.78) 5.4 (1.65) 4.1 (1.26)
50 (15.2) 10.1 (3.09) 6.0 (1.83) 4.6 (1.40)
55 (16.8) 11.1 (3.40) 6.6 (2.01) 5.1 (1.54)
60 (18.3) 12.2 (3.70) 7.2 (2.20) 5.5 (1.68)
65 (19.8) 13.2 (4.01) 7.8 (2.38) 6.0 (1.82)
70 (21.3) 14.2 (4.32) 8.4 (2.56) 6.4 (1.96)
75 (22.9) 15.2 (4.63) 9.0 (2.75) 6.9 (2.10)
80 (24.4) 16.2 (4.94) 9.6 (2.93) 7.4 (2.24)
85 (25.9) 17.2 (5.25) 10.2 (3.11) 7.8 (2.38)
90 (27.4) 18.2 (5.56) 10.8 (3.30) 8.3 (2.52)
95 (29.0) 19.2 (5.86) 11.4 (3.48) 8.7 (2.66)
100 (30.5) 20.3 (6.17) 12.0 (3.66) 9.2 (2.80)