Emerson Rosemount Apex Reference Manual page 101

Reference Manual
00809-0100-4731, Rev FA
April 2003
Country Installation Restrictions
South Africa Metal tanks
Spain Metal tanks
Sweden Metal tanks
Switzerland
Taiwan Metal tanks
Thailand
Trinidad & Tobago Metal tanks
Turkey Metal tanks
United Arab Emirates
United Kingdom Metal tanks
United States Metal or concrete tanks
Venezuela Metal tanks
(1) Eirp = Equivalent Isotropically Radiated Power
TABLE 1. Beamwidth vs. Distance from Gauge
Radius (r) from Flange Centerline to
Distance (D)
from Gauge 2-in. Antenna
ft (m) ft (m)
2 (0,6) 0.4 (0,12)
4 (1,2) 0.8 (0,25)
6 (1,8) 1.2 (0,37)
8 (2,4) 1.6 (0,49)
10 (3,0) 2.0 (0,62)
15 (4,6) 3.0 (0,93)
20 (6,1) 4.1 (1,23)
25 (7,6) 5.1 (1,54)
30 (9,1) 6.1 (1,85)
35 (10,7) 7.1 (2,16)
40 (12,2) 8.1 (2,47)
45 (13,7) 9.1 (2,78)
50 (15,2) 10.1 (3,09)
55 (16,8) 11.1 (3,40)
60 (18,3) 12.2 (3,70)
65 (19,8) 13.2 (4,01)
70 (21,3) 14.2 (4,32)
75 (22,9) 15.2 (4,63)
80 (24,4) 16.2 (4,94)
85 (25,9) 17.2 (5,25)
90 (27,4) 18.2 (5,56)
95 (29,0) 19.2 (5,86)
100 (30,5) 20.3 (6,17)
™
APEX
Other Comments
<-111 dBm at a distance of 25 meters
Site license required
<10mW of power transmitted
24-26 GHz
24.05-26.05 GHz, Average field strength <500 µW/m at 3 meters
Peak field strength limited to 5000 µW/m at 3 meters
0.075 eirp
"provided...equipment does not transmit any RF from the tank to outside and is not
open to the interferences coming from out, there is not any prohibition in its use"
No government approval required
2.7W eirp
500 µW/m at 3 meters
5000 µW/m at 3 meters
Beamwidth Edge
3-in. Antenna 4-in. Antenna
ft (m) ft (m)
0.2 (0,07) 0.2 (0,06)
0.5 (0,15) 0.4 (0,11)
0.7 (0,22) 0.6 (0,17)
1.0 (0,29) 0.7 (0,22)
1.2 (0,37) 0.9 (0,28)
1.8 (0,55) 1.4 (0,42)
2.4 (0,73) 1.8 (0,56)
3.0 (0,92) 2.3 (0,70)
3.6 (1,10) 2.8 (0,84)
4.2 (1,28) 3.2 (0,98)
4.8 (1,46) 3.7 (1,12)
5.4 (1,65) 4.1 (1,26)
6.0 (1,83) 4.6 (1,40)
6.6 (2,01) 5.1 (1,54)
7.2 (2,20) 5.5 (1,68)
7.8 (2,38) 6.0 (1,82)
8.4 (2,56) 6.4 (1,96)
9.0 (2,75) 6.9 (2,10)
9.6 (2,93) 7.4 (2,24)
10.2 (3,11) 7.8 (2,38)
10.8 (3,30) 8.3 (2,52)
11.4 (3,48) 8.7 (2,66)
12.0 (3,66) 9.2 (2,80)
and APEX Sentry
(1)
(1)
, 24.15-26.05 GHz, -20 to 55°C
D
r
Antenna Size
2-in.
3-in.
4-in.
NOTE
Radar gauges should not be mounted in the top center of the tank. Off centered
mounting is preferred.
™
Radar Gauge
Example: The beam
radius (r) at the bottom
of a 10-foot (3,05 m) (D)
vessel would be 0.9 ft
(0,28 m) for
a 4-inch antenna.
Beam Angle
Beam Angle
22.9°
13.7°
10.5°
A-3