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6. Glossary
Counts per Cubic Foot – The number of counts in a sample volume (cubic feet). This
is calculated using the parameters of the unit and the flow conditions.
Counts per Cubic Meter - The number of counts in a sample volume (cubic meter). This
is calculated using the parameters of the unit and the flow conditions.
Counts per Liter – The number of counts in a sample volume (liter). This is calculated
using the parameters of the unit and the flow conditions.
Cumulative Counts – The absolute number of counts for a channel. For example,
suppose the HPC301’s channel sizes are set to 0.3 μm, 2.5 μm, and 10.0 μm. Particles
are counted based on thresholds, and any particle that meets the 2.5 μm threshold also
meets the 0.3 μm threshold. So, both the 0.3 μm and 2.5 μm channel counts are
incremented.
Differential Counts – The relative number of counts for a channel (referenced to the
next largest channel). For example, suppose the HPC301’s channel sizes are set to 0.3
μm, 2.5 μm, and 10.0 μm. If the cumulative counts for the channels are 24576, 8754,
and 48 respectively, then the differential counts are 15822, 8706, and 48 respectively.
Sample Delay – The time before the first measurement is taken in a series of samples.
No data is collected during the sample delay. The sample delay can be set between
00:00 and 59:59.
Sample Duration – The time during which samples are actually taken. Data IS collected
during the sample duration. The sample interval can be set between 00:01 and 59:59.
Sample Interval – The time between measurements. No data is collected during the
sample interval. The sample interval can be set between 00:00 and 59:59.
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