10
2.3
Before You Begin
2.3.1 Site Preparation
Each R82 Radar transmitter is built to match the physical
specifications of the required installation. Make sure the
antenna connection is correct for the threaded or flanged
mounting on the vessel or tank where the transmitter will
be placed. See Mounting, Section 2.4.
Make sure that the wiring between the power supply and
Radar transmitter are complete and correct for the type
of installation.
When installing the Radar transmitter in a general purpose
or hazardous area, all local, state, and federal regulations
and guidelines must be observed. See Wiring, Section 2.5.
2.3.2 Equipment and Tools
No special tools are needed. The following items
are recommended:
• Threaded antenna and transmitter . . . . . . 2" (50 mm)
• Flat-blade screwdriver
• Digital multimeter or volt/ammeter . . . . . Optional
• 24 VDC (23 mA) power supply. . . . . . . . Optional
2.3.3 Operational Considerations
Radar applications are characterized by three basic conditions;
Dielectric, Distance (measuring range) and Disturbances
(turbulence, foam, false targets, multiple reflections and rate
of change).
2.3.3.1 Maximum Distance
Figure 7 at left shows the maximum measuring range
(Distance) based on fundamental conditions of
Dielectric, Distance and Turbulence. Maximum dis-
tance is calculated as Tank Sensor Offset. It
is measured from the Sensor Reference Point (bottom
of NPT thread, top of BSP thread or face of a flange).
2.3.3.2 Minimum Distance
If the liquid level is allowed onto the antenna, noise
and media build-up drastically decrease reliable meas-
urement. Liquid should not be allowed closer than
15" (380 mm), BSP: 16" (405 mm) from the bottom
of the antenna mounting threads (or face of hygienic
flange). The distance from the end of the antenna
varies depending on antenna chosen. See Figure 8.
58-610 Model R82 Radar Transmitter
Tank
Height
Sensor Offset
+ Tank Height =
Distance from
process connection
to tank bottom
20 mA
4 mA
Sensor Reference Point
Sensor Offset (+)
Blocking
Distance
Distance
Safe Zone
Media
Level
Level Offset
Lowest
Measurable
Value
Highest
Measureable
Value
Figure 7
Dielectric
Turbulence
R82
1.7-3.0
None
26 (8.0)
Light, < 0.5"
21 (6.4)
Moderate, < 1.0"
14 (4.3)
Heavy, > 1.0"
7 (2.1)
3.0-10.0
None
33 (10.1)
Light, < 0.5"
26 (7.9)
Moderate, < 1.0"
19 (5.8)
Heavy, > 1.0"
12 (3.7)
10.0-100
None
40 (12)
Light, < 0.5"
32 (9.8)
Moderate, < 1.0"
24 (7.3)
Heavy, > 1.0"
17 (5.2)
MAXIMUM DISTANCE
feet (meters)
