Operating Manual

Chapter 5 Radar Fine Tuning Accu-Wave
5-22 TN Technologies
User Considerations
If the tank is not quite empty or you do not want to map the tank bottom, it is essential that
the user-entered map distance be at least 30 cm (1 ft) above the level of the process
material (or tank bottom) while the tank map data is taken. If both the tank mapping and
clutter erase tools are being utilized, the clutter erase data must be acquired prior to tank
mapping.
Note: The “Tank Map Setup” menu structure appears only if “Service Only
Items” are enabled. Direct Entry Code 025020.
The direct entry codes were intentionally omitted from this table. Use the
“Tank Map Setup” menu to set up this tool.
“Tank Map Setup” Menu
[“Service Only Items” must be enabled]
Display Comments
Do not enable tank
mapping
Change to “Do”→→
Continue as is.↓↓
When set to the default value of “Do not enable tank
mapping,” the menu items below are not displayed.
Change to “Do” to enable tank mapping. Reset to “Do
not” at any time to disable tank mapping.
Direct Entry Code: ‘026040’
maximum distance to
map for false echoes
0.000 ft
25.25 assume NEXT↓↓
Set maximum distance to be mapped. Default or
assumed value is ~7.5 cm (0.25 ft) past the maximum
distance to be measured. If the tank is not completely
empty, the map distance must be less than the
distance from the REF LINE to the process material
surface.
Map empty tank for
false echoes
←←Exit this menu.
NEXT↓↓ EXECUTE CMD→→
This command maps the tank for false echoes such as
ladders, beams, baffles, etc. (not agitator blades).
false echo window
1% of max distance
NEXT↓↓
Set “false echo window” value, the first of three
criteria used to determine if an echo is a hit
(corresponds to a mapped echo). The default value is
1% of maximum distance.
map Q1 tol 32
NEXT↓↓
Set tolerance of the Q1 quality factor, the second of
three criteria used to determine if an echo is a hit
(corresponds to a mapped echoes). The default is 32,
meaning the Q1 value of the report echo must be
within 32 of the Q1 value of the corresponding
mapped echo to be considered a possible hit.
Note: The third criteria is the signal strength,
which must be within a factor of 2 of the
signal stremgh of the mapped echo.