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TDC1000-TDC7200EVM: TDC1000-TDC7200EVM is not able to detect the water level after 5 inch of water height.

Part Number: TDC1000-TDC7200EVM

I am using TDC1000-TDC7200 EVM to measure the water level. Following are the details about the sensors and the tank which I am using.

1) PZT Sensor: Default one which comes with the TDC1000-TDC7200EVM having 1 MHz frequency.

2) Tank: Diameter = 6 feet, Height = 3 feet , Material: Plastic

I am able to detect the water level upto only 5 inch.  After that I don't see any changes in TOF value. What is the limitation of the EVM and Sensors in terms of geometry of the tank (i.e. length, width, diameter, height)? What is the maximum water height EVM can detect? Which sensors I should buy to detect the water height upto 3 feet or more? Can you suggest some sensors?

Thank you.