Hach-Lange SONATAX sc - Manual (Page 21)

21
Installation
Example 4: Application with large tank depth and clear separation
layer, but high absorption of the ultrasound by turbid materials
above the separation layer.
Absorption is so high that no sludge level is detected at a plunger
depth of 0.2 m and LL THRESH. AUTO 0.1 (SENSOR MEASURE
error message).
After adjustment of the plunger depth SENSOR SETUP >
CALIBRATE > PLUNGERDEPTH to 3 m, the sludge level can be
precisely determined at 3.30. The strength of the echo 1.41 shows
that there is a clear separation layer.
Note: After adjustment of the plunger depth, the setting of the tank floor
must be checked (SENSOR SETUP > CALIBRATE > TANK DEPTH)
Example 5: Application with clear separation layer, but interference
signal above the separation layer (for example skimmer).
Ideal profile, correct measurement value.
The same measurement point with sporadic interference of the
echo in a 0.67 m tank depth. The measurement value is incorrect.