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3700 Portable Samplers
Section 1 Introduction
1.2.3 STORM Sampling
1-4
In samples-per-bottle multiplexing, more than one sample
volume can be placed in a bottle. Samples-per-bottle multiplexing
allows you to collect a series of small composite samples.
If you deposit several samples in each bottle, the contents rep-
resent an average of the flow stream during the sampling period.
In bottles-per-sample multiplexing, you can place equal sample
volumes in as many as 24 bottles at each sample event.
Bottles-per-sample multiplexing is ideal for situations where you
need identical sets of samples – when you need to use more than
one preservative, for example. You can multiplex both time-paced
and flow-paced sequential samples.
The third type of multiplexing, multiple-bottle compositing, is
accessible through the extended programming mode. Mul-
tiple-bottle compositing places more than one sample volume
into more than one bottle. At each sample event, a sample
volume is placed in several bottles, in sets of as many as 24
b o t t l e s .
M u l t i p l e - b o t t l e
bottles-per-samples multiplexing and samples-per-bottle multi-
plexing; it is applicable to situations where you need a series of
identical sets of samples. You can also use multiple bottle com-
positing when you need a series of larger volume composite
samples by taking several smaller samples and distributing
them over several bottles.
In the extended programming mode, you can switch multiplexed
bottles or bottle sets after a programmed number of samples
have been deposited or after a programmed period of time. Both
methods can be used with either time-paced or flow-paced rou-
tines. By specifying the number of samples to be deposited, you
can control the volume of each bottle precisely. By specifying that
the sets be switched after specific time periods, you can control
the time frame for a series of sample volumes. This is especially
useful for flow-paced sampling. Although the flow rate may vary,
each bottle or bottle set represents a fixed time period.
The 3700 Series storm capabilities are ideal for monitoring storm
water runoff. The sampler allows you to divide the bottles into
two groups. The first group of bottles is normally reserved for a
first-flush grab sample. The second bottle group receives the
flow-weighted composite samples. You can distribute samples in
either group sequentially or in any of the three types of multi-
plexing. Three bottle configurations are available for STORM
sampling with the 3700 Standard are: the 24-bottle configuration
with either 1,000 or 350 ml bottles, a 12-bottle configuration con-
taining 1 quart (950 ml) glass bottles, and a 4-bottle configu-
ration with 1-gallon (3,800 ml) glass bottles. With the 3700
Compact, 24-bottle sets have a capacity of 500 ml and 12-bottle
sets have a 300 ml capacity.
STORM sampling takes full advantage of the sampler-enable
programming available through the Teledyne Isco 4200 Series
Flow Meters, or the 4100 Series Flow Logger and the Flowlink
software. You can program the flow meter to monitor the flow
c o m p o s i t i n g
c o m b i n e s
®
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