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TDC1000-TDC7200EVM: In GUI, Tank Level and Flow mode mean what?

Part Number: TDC1000-TDC7200EVM

Hi!

I have few questions.

I use GUI version 1.2.7.1.

To sense the fluid level, i downloaded Matt Minasi's config. (TDC1000-7200_level_cells_saleskit_2_2015.txt)

When i go to the TANK LEVEL tab after starting graph, the current level is fixed at 2.18cm.

I try to add or reduce water in plastic tank i used, but it still fixed at 2.18cm. And there is TANK EMPTY message on GUI.

I think the sensor is mounted at tank well. But it didn't work. TANK EMPTY means what?

Also in graph tab, Is the unit of TOF AVG VALUE nano second?

When i change water level, TOF VALUE's change amount is very small. So i can't calculate the exact water level using that value.

If it is related to the strange TANK LEVEL, how can i fix it?

One more question, what FLOW MODE means?

Using that mode, graph's Y axis is changed and DELTA TOF VALUE is shown.

What is the difference from original mode?

Best regards,

Shin A