it gave me unreal and constant values
I can't follow this. What exactly gives you these values? Is it the Arduino IDE ?
Please provide exact details on what you have connected.
two pin one is short and another one is long
The drive signal is a balanced pair one wire for each pin(long or short). You should use shielded cable which
has a third connection - the shield.
Earth the shield at the circuit board end and leave the end at the transducer unconnected.