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3.10.1 Extended Mode
Sample Pacing
3.10.2 Extended Mode
Sample Distribution
compositing. The procedure and displays used to program the
sampler for bottles-per-sample and samples-per-bottle multi-
plexing, and sequential sampling are somewhat different. The
section is also extended to allow you to switch multiplexed
bottles or bottle sets after programmed periods of time. (With the
extended mode, you can still switch bottles after a programmed
number of samples have been deposited.) The Key Times section
is extended to allow you to enter the time of the first bottle or
bottle set change. If you have enabled the Sampling Stops and
Resumes configure option, the Key Times section is extended to
included displays for sampling stops and resumes.
Each of these extended features is discussed briefly below. You
may find it helpful to refer to Figures 3-10, 3-11, and 3-12, which
chart the program sequence in the extended mode.
In the extended programming mode, the Sample Pacing section
allows you to select flow pacing, or one of two types of
time-pacing: uniform or nonuniform. If you select uniform time
intervals, the settings for time intervals are identical to the time
intervals entered in the basic programming mode.
Nonuniform times allow you to pace the sampler at irregular
intervals. Before you enter nonuniform time intervals, you must
specify either minutes or clock times in the Nonuniform Times
configure option. You can enter nonuniform intervals in two
ways. The first method allows you to define the interval between
each sample event in minutes. For example, you can program the
sampler to take sample #2 after an interval of 10 minutes,
sample #3 after an interval of 30 minutes, sample #4 after an
interval of 60 minutes, and so on. Sample #1 would be taken at
the start time. The second method allows you to enter a specific
time and date for each sample event. For example, with non-
uniform time pacing, you can collect samples at specific times
and dates at irregular intervals: 6 a.m. on April 15, noon on April
15, 7 a.m. on April 16, and 1 p.m. on April 16.
If you have several sequences of nonuniform times, you can use
the program storage feature to save the programs using each
sequence.
The extended Sample Distribution section expands the multi-
plexing capabilities of the sampler. Both the bottles-per-sample
and samples-per-bottle multiplexing are available; however, the
procedure used to program them differs slightly from the pro-
c e d u r e u s e d i n t h e b as i c p r o gr am m i n g m o d e. E x a m p l e
Time-Paced Multiplexed (samples-per-bottle) Sampling demon-
strates the procedure used for samples-per-bottle multiplexing;
Example Extended Flow-Paced Multiplexed (bottles-per-sample)
Sampling shows the bottles-per-sample multiplexing procedure.
The extended mode also offers multiple bottle compositing; refer
to Example Flow-Paced Sampling / Time-Based Bottle Sets.
In the extended programming mode, you can switch bottles or
bottle sets after a programmed time period elapses or after a pro-
grammed number of samples have been deposited. The displays
3700 Portable Samplers
Section 3 Programming Guidelines
3-57
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