R95-510A-110 Datasheet, PDF (5/16 Pages) Magnetrol International, Inc. – Pulse Burst Radar Level Transmitter

OPERATIONAL CONSIDERATIONS
Radar applications are characterized by
three basic conditions:
• Dielectric
• Distance (measuring range)
• Disturbances (turbulence, foam,
false targets, multiple reflections
and rate of change)
The PULSAR Radar transmitter is offered
with four antenna configurations:
• Polypropylene Dielectric Rod
• TFE Dielectric Rod
Sensor Offset +
Tank Height =
Distance from
process
connection
to tank bottom
• All-Plastic Dielectric Rod:
Polypropylene or Halar^®
• 4" (100 mm) Horn
Lowest
Measurable
Value
• 6" (150 mm) Horn
Level Offset
Maximum measuring range (distance) is calculated as
Tank Height + Sensor Offset. Refer to Figure 3. It is measured
from the sensor reference point (bottom of NPT thread, top of
BSP thread, or face of flange).
Sensor Reference Point
Blocking
Distance
Safety Zone
Sensor Offset (+)
20 mA
Distance
Media
Level
Tank
Height
4 mA
Figure 3
Ideally the 6" (150 mm) horn antenna should be used to ensure
the best possible performance in all operational conditions.
Since that is impractical, other antennas are available. The
chart shows the maximum measuring range of each antenna
based on dielectric and turbulence. Refer to Figure 4.
Noise and media buildup drastically decrease reliable measure-
ment; although, it is theoretically possible to measure a liquid
level on the antenna. Liquid should not be allowed closer than
2 inches (50 mm) from the bottom of the antenna due to the
decrease in accuracy when liquid level is present on the
antenna. Refer to Figure 5.
Sensor
Reference
Point
(NPT)
MAXIMUM DISTANCE feet (meters)
Dielectric
Turbulence
Dielectric
Rod (1¹â„2") Œ
1.7-3.0
3.0-10.0
10.0-100
None
Light, < 0.5"
Moderate, < 1.0"
Heavy, > 1.0"
None
Light, < 0.5"
Moderate, < 1.0"
Heavy, > 1.0"
None
Light, < 0.5"
Moderate, < 1.0"
Heavy, > 1.0"
35 (10.7)
28 (8.5)
21 (6.4)
15 (4.6)
50 (15.2)
40 (12.2)
30 (9.1)
20 (6.1)
65 (20)
52 (15.8)
39 (11.9)
25 (7.6)
ΠMinimum dielectric = 2.0
Figure 4
4" Horn
40 (12.2)
33 (10.1)
26 (7.9)
17 (5.2)
55 (16.8)
44 (13.4)
33 (10.1)
22 (6.7)
65 (20)
52 (15.8)
39 (11.9)
27 (8.2)
6" Horn
45 (13.7)
37 (11.3)
29 (8.8)
20 (6.1)
60 (18.3)
48 (14.6)
35 (10.7)
25 (7.6)
65 (20)
53 (16.2)
41 (12.5)
30 (9.1)
Sensor
Reference
Point
(BSP)
2" (50 mm)
Figure 5
Sensor
Reference
Point
(Flange)
5