MPX5010DP offset and sensitivity strange values

[jlvassent]

Hi,

I have a MPX5010DP pressure sensor connected to an Arduino Uno.
Pin 1 (with the mark) on the MPX5010DP is connected to Pin A0, Pin 2 is connected to Ground and Pin 3 to 5V on the Arduino. 
Without any pressure applied, the offset value is about 1.58 V.
The sensitivity is about 2.43 mV/mm H2O. These values does not match the datasheet values : 0.2 V for the offset, 4.413 mV/mm H2O for the sensitivity.
I can't see anything wrong with my setup.

Has anyone ever observed this kind of problem?

Thanks

[ErikaC · Accepted solution]

Hello,

These devices are very sensitive. To ensure optimal performance, we recommend implementing auto-zero according to the application note linked below:

Implementing Auto-Zero for Integrated Pressure Sensors

Hope this helps.