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Reference Manual
00809-0700-4530, Rev AA
Section 4: Measurement validation
September 2013
Measurement validation
Figure 4-8. Emptying a tank or chamber
Finally, review the level trend for accuracy.
Step 6: echo-curve verification with empty tank
When the tank or chamber is empty, download and review the echo-curve according to the
following steps:
1. Compare echo-curve with previous plots
Compare the echo-curve with previous plots, taken during commissioning. There
should be no major differences. Especially make sure to review:
the amplitude and position of the reference pulse
if all noise is below the threshold
the amplitude and position of the bottom or probe-end pulse
2. Store the echo-curve
Permanently store the echo-curve for future use, with re-occurring verification
procedures.
Step 7: monitor level while filling
Repeat Step 5, but fill the tank or chamber instead of emptying it.
2: Open
vent
3: Open
drain
1: Close valves