Anyone has experience for Figaro KE-25 O2 sensor?

Hello

I am trying to test my sensor, Figaro KE-25.

It has two differential output pins.

I am trying to get the signal through instrumentation amplifier to one of analog input

to Aruino mega 2560.

I have connected two differential signal to INA129 instrumentation amplifier and connect

single ended output to the analog input of mega (A0)

I keep getting 0 output.

If I do not connect there is some random value but as soon as connect output of INA129 to A0 than

readout signal becomes 0.

Do you know what happens here?

If anyone has experience with KE-25 readout, please help me with that.

Thanks