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3700 Portable Samplers
Section 3 Programming Guidelines
3.4.1 Storm-Event Sample
Distribution Schemes
Figure 3-5 Storm Distribution Scheme
3.5 Programming
Introduction
3.5.1 Operating States
3-8
A bottle group can consist of one or more bottles. Thus, the
first-flush sample can be a large sample delivered to a single
bottle or distributed to several bottles with a multiplexing
scheme. The remaining samples can be distributed to the second
bottle group sequentially or according to any of the three
available multiplexing distribution schemes: bottles-per-sample,
samples-per-bottle, or multiple- bottle compositing. By dividing
the samples into multiple bottles, you can analyze the pollutant
concentration from each phase of the storm event. To obtain an
analysis of a composite sample, combine the contents of the
bottles into a composite for the grab sample and a composite for
the flow-weighted samples.
Figure 3-5 shows a storm distribution scheme that combines
time-paced bottles-per-sample multiplexing with flow-paced
samples-per-bottle multiplexing. The program has allocated
bottles 1, 2, and 3 for the timed grab samples, and bottles 4
through 24 for flow-paced samples. At each time-paced sample
event, the sampler places a single sample in the first bottle
group: bottles 1, 2, and 3. Each bottle of the second group
receives two samples per bottle.
Bottle Number (12 of 24 Bottles Shown)
1
2
3
4
1
1
1
2
Time-paced Segment
Time Bottle Group
The sampler's programming process is self-prompting. Prompts
displayed on the LCD step you through the programming
sequence in a logical order, indicating the needed value or option.
For example, the sampler will prompt you to enter settings for
the interval between samples (select either time-paced or
flow-paced intervals); sample volume in ml; and other operating
controls. These settings can be changed at any time. The sampler
accepts only appropriate values for the program settings and
rejects any unacceptable values. If you turn off the unit or the
power is disconnected, the lithium battery retains settings in the
sampler's memory.
There are three operating states: the standby state where the
sampler is waiting for your instructions, the run state where the
sampler is running a sampling routine, and the interactive state,
which is used to program the sampler. Each state serves a dif-
ferent purpose and is discussed separately.
Standby State – In the standby state, the sampler is waiting for
your instructions. From standby, you can start a sampling
routine, placing the sampler in the run state. You can also access
the interactive state, which is discussed in an upcoming section.
Sample Event Number
5
6
7
8
9
10
8
10
4
6
2
2
3
5
7
9
Flow-paced Segment
Flow Bottle Group
11
12
12
14
13
11
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