ISCO 6700SR, Инструкция по эксплуатации, Страница: 99 / 190

6700SR Refrigerated Sampler
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Event pacing uses the combination of both the programmed enable
conditions and the external enable (pin F of the external flow meter
connector) to determine the enable state. Each time it becomes en-
abled, the sampler takes one sample, placing it in one bottle. The
sampler must become disabled between events. The sampler always
takes a sample at the start time for event paced programs. Nonuni-
form clock time programming schedules each sample event individ-
ually. The sampler skips samples scheduled while it is disabled.
Although you can combine flow pacing and all time pacing types
with any distribution, event paced programs by definition uses only
sequential distribution. The sampler finishes an event paced pro-
gram after depositing a sample in each bottle.
Distribution
Distribution describes how the sampler is to deposit samples. A
sample is the volume of liquid deposited in a bottle. A sample event
includes the full sampling cycle and may deposit a sample into
more than one bottle. You can program the sampler for five distri-
bution methods:
• Sequential
• Composite
• Bottles per sample
• Multiple Bottle Compositing
• Samples per bottle
Sequential
In sequential distribution, the sampler deposits one sample in each
bottle. A sequential sample represents a “snapshot” of the flow
stream at a point in time.
Bottles Per Sample
In bottles per sample distribution, the sampler deposits a sample
in each of a set of bottles. A bottle set includes at least two bottles
but may include all bottles. Use bottles per sample when the vol-
ume to be collected is larger than the amount one bottle can hold or
when you need identical samples.
Samples Per Bottle
In samples per bottle distribution, the sampler deposits samples
from several sample events in a single bottle before moving to the
next bottle. Use samples per bottle distribution to collect a series of
small composite samples.
Composite
For single bottle configurations, samples per bottle distribution is
known as composite sampling. A composite sample represents an av-
erage of the flow stream’s characteristics during the sampling period.
Distribution
Menu Charts appear in:
Figure 23, Standard Programming:
Programming Screens on page
108.
Figure 33, Extended
Programming: Equipment Setup
on page 117.