Tisch Environmental PUF+, Operator'S Manual

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PUF+ Operator’s Manual Tisch Environmental
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The first line of the report identifies that this unit as a PUF+ with the given serial number and
that this is the REPORT format.
The second line indicates when the REPORT.CSV file was retrieved from the unit.
The “--------” line indicates the beginning of a sample record.
The “Start Time (Set)” and “Start Time (Act)” lines indicate when the unit was set to start
and when it actually started, respectively. These times could be different if there was a
power failure at the beginning of the test and the unit started late.
The “Duration” line indicates the actual sampling duration in Hours : Minutes : Seconds.
The “Conditions” line indicates whether the test and data provided are being reported at
Ambient or Standard Conditions.
The “Flow (Set)” and “Flow (Avg)” lines indicate the flow rate set point and average values
respectively. The values are reported in L/min with conditions as indicated by the
“Conditions” line.
The “Flow CV” line provides the value for the coefficient of variation of the flow rate during
the test. This is a measure of stability of the flow during the test. The closer the number is to
zero the more stable the flow. This value should usually be less than 2%. If it is greater, it
could indicate a pending failure of the motor, odd sites conditions (i.e. extremely gusty wind
conditions), or someone tampering with the unit during sampling.
The “Sample Volume” is the total volume (reported at the value stated in the “Conditions”
line) that passed through the sample media during the test. The value is reported in m
3
. This
value may be slightly larger than the value calculated by multiplying the duration by the
average flow rate. This is because the volume is recorded from the very beginning of the
test, while the average flow calculation starts after 1 minute to keep startup variation in the
flow from affecting the average value. The difference is very very small and may not be
noticeable on longer test.
The “Avg Amb Temperature” line reports the average ambient temperature during the
sampling event. The value is reported in degrees C.
The “Avg Amb Pressure” line reports the average ambient pressure (aka true barometric
pressure) and is reported in mmHg.
The “Flags” line reports any items that may be of importance in determining the validity of
the data. The individual flags are separated by commas. The possible flags are POWER
(which indicates a power failure or brown out occurred during the sampling), ABORTED
(which indicates the sampling was aborted by user interaction with the timer), and EXPIRED
(which indicates the sampling never occurred, likely because the unit was without power for
the entire test).