15
2.4.2 Installing the Transmitter
Install the Transmitter with its integral antenna by threading
into the vessel. DO NOT OVERTIGHTEN as this may
cause damage to the plastic threads.
• Do not place insulating material around any part of the
radar transmitter including the antenna flange.
• Installation for NEMA 6P/IP 68: the R82 can be installed
to allow for temporary submergence to 6.5 ft. (2m) for 24
hours:
- use TFE paste to seal conduit entries or IP 68
cable glands
- Do not overtighten plastic housing cover; O-ring
develops water-tight seal without excessive tightening
2.4.2.1 Orientation
The R82 transmitter utilizes a linearly polarized, microwave
beam that can be rotated to improve its performance.
Proper orientation can minimize unwanted reflections,
decrease sidewall reflections (multipath) and maximize
direct reflections from the liquid surface.
The internal launcher mechanism can be turned to optimize
performance. The launcher has index marks numbered
1–18 (representing 10–180 degrees). The polarization
pattern is parallel to the transmitter display when the
adjustment mechanism is in the #11 position (factory
default). See Figures 16 and 17.
2.4.2.2 Launcher Orientation—Level Application
Ideally, the transmitter should be mounted half the radius
from the tank wall. In a typical vertical tank, the Launcher
should be adjusted so the polarization pattern is parallel to a
line tangent to the nearest tank wall. See Figure 17.
Rotate the internal Launcher adjustment to achieve the
correct Polarization position. Remember each notch on the
adjustment wheel is 10 degrees of rotation. See Figure 18.
For horizontal cylindrical vessels, aim beam down the long
axis of the vessel. Do not optimize the Echo Strength at one
level in the vessel.
A transmitter mounted within 10" (25 cm) of a tank wall
may demand orientation adjustments to limit multipath
and optimize performance. See Section 2.4.2.4,
Poor Echo Strength.
58-610 Model R82 Radar Transmitter
Ground
Launcher Adjustment
in #11 Position (Default)
Figure 17
Polarization Pattern
Tangent Line
Figure 16
Launcher Adjustment in
#11 Position (default)
Figure 18
Examples of Launcher
Orientation Adjustments
90 degrees: Rotate Launcher
Mechanism CW 9 notches
30 degrees: Rotate Launcher
Mechanism Clockwise (CW) 3 notches
∠
30°
∠
90°
Tangent Line