MN301905 Rev A
47
|
Configuration
(with WebCal
®
)
Step Five
STEP 7 - CHECK THE ECHO CURVE
This function displays the primary echo return(s) that the sensor is seeing graphically, the location and
amplitude of the return(s), and the numeric air gap distance from the sensor’s measurement location to the
media level below.
Note: This step should only be performed after having completed the prior six configuration
steps with the sensor installed on the tank.
Additionally, if the sensor was installed in a stand pipe or sight
glass, now go forward to Section Six and turn on the still well function (Sensor Installed in a Stand Pipe or
Sight Glass) before continuing with this step.
1) Click on the Echo Curve tab, then
on Echo Curve box and then on
Load.
2) The curve graphically represents
the
primary
echo
return(s)
amplitude (Y-axis) over distance
(X-axis). Above the echo return
peak is a floating arrow and
triangle symbol (which under
normal conditions are often
merged together or seen as a
single triangle because it’s the
larger of the two symbols). The
arrow represents the measured
liquid level and the triangle
represents the peak amplitude
location of the echo return. Under
normal conditions, expect to see
a stable triangle (or overlapping
arrow and triangle) floating above
a pronounced peak at the
expected air gap distance between the measurement location and liquid level.
3) In the upper right hand corner of the screen are two lines of numbers that represent the air gap distance
from the measurement location to the liquid level (arrow) on the top, and peak amplitude location (triangle)
of the echo return on the bottom. Under normal conditions, these values should be relatively close to one
another and consistent with the expected air gap distance between the measurement location and liquid
level.
4) Assuming that the sensor is properly installed, if the measured liquid level and peak amplitude location
data (symbols and values) are unstable, substantially different from one another and/or inconsistent with
the actual air gap distance, then this likely indicates that the sensor requires additional process
adjustment(s) described in the following Section Seven.
