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TDC1000-TDC7200EVM: TDC1000 and TDC7200EVM. What is the reason of 106mm level limitation

Part Number: TDC1000-TDC7200EVM

Dear colleagues. Sorry for dumb question, we are novices in ultrasonic measurement.

We recently bought TDC1000 + TDC7200EVM board to learn this subject.

There was ultrasonic transducer in the TDC7200 package but it was damaged. So are testing with China transducer with 1 Mhz frequency and 15mm diameter.

Test stand like in your manual - plastic tank with water. And it works fine but till 106 mm level. 

With different TDC1000 settings it is always same limit of 106 mm. At picture above - the last received data after adding water to the testing tank.

Is it EVM7200 limitation or we must look for another PZT transducer?

Many thanks, Anatoly.