I have tried changing the sensor but same result. It might be working fine as i have not tried using the amplifier because i was expecting that even without using amplifier , the output signal would be atleast large enough to tell that the sensor is working fine. But may be the signal is too small. When i set the DMM scale to 2000mv DC , i am getting about 800mv DC and passing the hand over it decreases it 2-8mv and then comes back to 800mvDC but when i set the DMM to AC scale I am getting 1.3 v continuosly without any change . Is this behaviour okay ?? i am not using amplifier yet.