Hi,
Typically, the un-ported vacuum kind of pressure sensors like the MPXV6115V6U are used for measure the pressure inside of vacuum chambers, however, the bottom part of the sensor should be placed outside the chamber, otherwise pressure measurement would not be possible. If you need to connect the sensor to a tube (trough a hose for example), the ported version of the sensor would be recommended (MPXV6115VC6U).
These Vacuum/Gauge pressure sensors have a hole underneath the package since the local atmospheric pressure is used as the reference for the measurement.
Mechanically speaking, it is a challenge to use the MPXV6115V6U (un-ported version), so, for test purposes I recommend you to use the MPXV6115VC6U (ported version). Both work exactly in the same way, the only difference is the ported/un-ported package.
Have a great day,
Jose
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