6700 Portable Sampler User Manual - Isco
6700 Portable Sampler User Manual - Isco
6700 Portable Sampler User Manual - Isco
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Distribution<br />
Menu Charts appear in:<br />
Figure 26, Standard Programming:<br />
Programming<br />
Screens on page 113<br />
Figure 36, Extended Programming:<br />
Equipment Setup<br />
on page 122.<br />
<strong>6700</strong> SAMPLERS<br />
Random Interval Pacing<br />
To program the sampler for random interval pacing, enter the<br />
length of time you want to sample. The run time is the only random<br />
programming setting you’ll need to enter because the sampler<br />
derives the number of sample events required for the<br />
program from the distribution settings. (You can combine random<br />
pacing with any distribution.) Each time you run the program,<br />
the sampler generates a new set of random intervals. This<br />
makes each sample event unpredictable from run to run.<br />
In both nonuniform clock time pacing and nonuniform interval<br />
pacing, the sampler takes a sample at the start time. For random<br />
pacing, however, it takes the first sample at the end of the first<br />
interval, not at the start time.<br />
Event Pacing<br />
To program the sampler for event pacing, select EVENT PACED<br />
from screen 8. When prompted for the enable setting, enter the<br />
enable settings at which you want the sampler to take samples<br />
(see <strong>Sampler</strong> Enable on page 90).<br />
Event pacing uses the combination of both the programmed<br />
enable conditions and the external enable (pin F of the external<br />
flow meter connector) to determine the enable state. Each time it<br />
becomes enabled, the sampler takes one sample, placing it in one<br />
bottle. The sampler must become disabled between events. The<br />
sampler always takes a sample at the start time for event paced<br />
programs. Nonuniform clock time programming schedules each<br />
sample event individually. The sampler skips samples scheduled<br />
while it is disabled.<br />
Although you can combine flow pacing and all time pacing types<br />
with any distribution, event paced programs by definition uses<br />
only sequential distribution. The sampler finishes an event<br />
paced program after depositing a sample in each bottle.<br />
84<br />
DISTRIBUTION<br />
Distribution describes how the sampler is to deposit samples. A<br />
sample is the volume of liquid deposited in a bottle. A sample<br />
event includes the full sampling cycle and may deposit a sample<br />
into more than one bottle. You can program the sampler for five<br />
distribution methods:<br />
Sequential Composite<br />
Bottles per sample Multiple Bottle Compositing<br />
Samples per bottle<br />
Sequential<br />
In sequential distribution, the sampler deposits one sample in<br />
each bottle. A sequential sample represents a “snapshot” of the<br />
flow stream at a point in time.