Error In Constant Reading

Hi
I had developed a very simple vi that takes in pressure readings from a peizo electric sensor once in 15 seconds, and displays it in a graph and also writes values it to a measurement file . 
However though the pressure is maintained constant the graph shows results fluctuating from +5 to -5 ( almost like a square graph) I am sure that I have connected the have connected my terminals right and also the pressure gauge reads constant one bar pres. I do not know why my readings are fluctuating .
Please help.
Thanks in advance.
Avinash 

Please do check the functonality of the piezo sensor.
If that is working perfiectly fine, do attach your code.
Regards
Grugh Mike
Success is Everything !!

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