Chapter 3
38
If the test start time is less than five
minutes away…
…the pump and internal systems
do not power down. The current
time/date and start time/date are
displayed. The instrument begins
logging at the correct time.
If the test start date and/or time has
passed…
…pressing the “
↵
” key has no
impact. The program will never
execute (no data will be logged).
If no test length is set…
…the P-T
RAK
®
particle counter
samples continuously until the “
↵
”
key is pressed or until the memory
is full.
If you press the “
↵
” key during
sampling…
…the program stops data logging.
When a pre-programmed test
sequence ends…
…the P-T
RAK
®
particle counter
automatically returns to the Survey
Mode.
Memory Considerations
The P-T
RAK
®
particle counter has a great deal of memory and you will not
normally have to be concerned with running out. The instrument contains
separate memory for the single points and the logged tests (filling up the
memory for one type of data will have no affect on the other type).
The P-T
RAK
®
particle counter can store approximately 470 single points. It
can also store approximately 1000 hours (41 days) of logged tests, when
recording at 1 minute logging intervals (the number of hours of logged tests
may be more or less, depending upon the logging interval). Those 1000
hours may be separated into as many as 141 tests.
The total test time should be considered when selecting a logging interval.
Shorter logging intervals use memory more quickly than longer intervals.
The logging interval and the available memory determine the maximum
possible duration of a data logging session.
Particle Sampling Configurations
The P-T
RAK
®
Ultrafine Particle Counter can be operated in three sampling
configurations:
•
Sampling through the inlet screen, sample tube, and telescoping
probe assembly (standard configuration)
•
Sampling through the inlet screen and sample tube
•
Sampling through the inlet screen assembly only
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