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6712FR Refrigerated Sampler
Section 4 Standard Programming
4-6
The flow meter or flow logger sends the same pulse for both flow
and trigger pacing, and the sampler cannot distinguish between
them. Therefore, to program a sampler for trigger pacing, simply
program it for flow pacing.
4.5 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.
In standard programming, you can program the sampler for
these different distribution methods:
• Sequential
• Bottles Per Sample
•Samples Per Bottle
•Composite
4.5.1 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.
4.5.2 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
volume to be collected is larger than the amount one bottle can
hold or when you need identical samples.
4.5.3 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.
4.5.4 Composite For single bottle configurations, samples per bottle distribution
is known as composite sampling. A composite sample represents
an average of the flow stream’s characteristics during the sam-
pling period.
4.5.5 Continuous Sampling Sample programs can be run indefinitely by selecting “YES” at
the “RUN CONTINUOUSLY?” screen. Continuous sampling
resets the distribution when the distribution sequence is com-
plete. That is, when the last bottle/set is reached, the next
bottle/set is the first bottle/set. All pacing modes except
RANDOM are supported.
When running a program continuously, the bottles must be ser-
viced at regular intervals to prevent overfilling the bottles. The
sampler assumes that the next bottle/set is empty and ready to
receive samples.
The figure on the next page steps through the programming
screens for sequential, bottles per sample, and samples per bottle
distribution.