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3.10 PSN
The PSN tab displays the particle synchronization number (PSN), which is a simplified metric that can be
used for pass/fail type testing. The PSN metric was initially developed to apply pass/fail criteria to issues
with diesel particulate filter (DPF) technology, where a hairline crack in the DPF would not be noticed by
a typical opacity sensor but would be readily seen by the parSYNC® due to its three particulate
measurement technologies.
3.11 RAW
The RAW tab shows the raw voltage from each of the gaseous and particulate sensors. This is
completely unprocessed signal and does not include any zeroing corrections. The RAW tab is also used in
the span calibration of the gaseous sensors. We do not expect the user to be doing the span calibration
for the particulates, though that is feasible if the user wants to.
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