For a project we are supposed to measure the air pressure in a wind tunnel at different measuring points of an object by means of several differential pressure sensors.
At the measuring points there is a maximum differential pressure of ~200Pa, i.e. 2mbar.
For this purpose, we were given the specification for the selection of the sensors that they should not exceed an inaccuracy of 1%.
We were provided with the following sensors for testing purposes:
2x MPX2010DP, 2x MPX2100DP, 2x MPX2050DP and 2x MPX53DP.
Now after further research and some testing with these sensors we found out that all of them are not really suitable for our project, unless you would work with an instrumentation amplifier.
In other threads, the MPX5010DP data sheet MPX5010DP was used for similar applications, since this already brings a built-in amplifier with it and thus also a much higher sensitivity. Now, according to the data sheet, this also has an inaccuracy of 5% and would therefore again not fit our specifications.
Since we are absolute beginners in this topic, we now have the following questions:
What exactly does the sensitivity value of 450mV/kPa (MPX5010) mean in contrast to 0.4mV/kPa (MPX2100) data sheet MPX2100DP ?
Which sensor is best suited for our application? Do we prefer to use one of the sensors provided to us (including an instrumentation amplifier), or do we prefer to use an MPX5010DP directly, for example?