Why is my sensor output only 1v when using a 2.5v reference voltage?

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rama1001
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I have sensor that produces differential output. I saw in the sensor schematic that they have used 2.5v DC as reference in the output minus terminal. I am taking sensor output as differential that both positive and negative(2.5DC ref terminal)in count. I got output as 1v of DC when the sensor is placed near to my setup(pump with Accelerometer sensor)

My doubts are..
1) What happened to 2.5 reff voltage. Why i get as 1v in output.
2) why we used these reference voltage.

Please clear my doubts.
 
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The sensor probably puts out 0-2.5V over the range of the variable sensed. Possibly, -2.5 to +2.5 V. The 1V reading means what you are sensing is intermediate in the range.

My guess is that you must supply the 2.5V for power. But it could also be a voltage divider accepting up to 2.5V. You would have to give us the part number to be sure.