6700 Portable Sampler User Manual - Isco

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Time Switched
Distribution
2BOTTLESPER
SAMPLE EVENT (1-max)
Enter the number of bottles
that should receive samples
at each sample event.
SWITCH BOTTLES ON:
NUMBER OF SAMPLES
TIME
Select TIME.
SWITCH BOTTLES EVERY
__ HOURS, __ MINUTES
Enter the time between
bottle switches.
FIRST SWITCH TIME
AT: __:__
Enter the first bottle
switch time.
6700 SAMPLERS
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.
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 average of the flow stream’s characteristics during the
sampling period.
Multiple Bottle Compositing
Multiple bottle compositing is a combination of bottles-per-sample
and samples-per-bottle. At each sample event, the sampler
deposits a sample into a set of bottles. It moves to a new bottle
set only after each bottle of the first set contains the programmed
number of samples. Use multiple-bottle compositing to collect
identical sets of composite samples or a composite sample that is
larger than the capacity of a single bottle. Multiple bottle compositing
is available only in extended programming.
Time Switching
In extended programming, the sampler offers an additional distribution
feature, time switching. This feature determines when
the sampler fills the next bottle or bottle set, and may be used
with time-paced or flow-paced sample programs. Time switching
distribution occurs at regular intervals (as programmed in
screen 16 in the margin). The switch times are relative to the
programmed “FIRST SWITCH TIME” (screen 17).
Switch times occur regardless of the state of the sampler. Be
aware that the sampler may leave empty bottles if it becomes disabled.
Pause and resumes are an exception; the sampler will not
switch bottles during a pause if the current bottle is empty.
If the program settings instruct the sampler to take a sample at the
start time, the sampler also draws a sample at the switch time.
When this occurs, the pacing will also be reset at the switch time.
Time switching can also be used with flow-paced programs that
do not take a sample at start. These programs will place a sample
in the current bottle if it is empty at the switch time, and
then move to the next bottle/set. Pacing intervals are reset at
every switch time.
Whenyouusethetimeswitchingfeature,thevolumeineachbottle
or bottle set may vary. Sample volumes that would exceed the
bottle capacity are not taken and a “PROBABLE OVERFILL”
message is logged.
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