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1.2.1 Flexible Sampling
Intervals
1.2.2 Multiplexing
The basic programming mode allows you to set up typical sam-
pling routines easily and efficiently. The extended programming
mode expands the versatility of the sampler by providing options
that let you create complex sampling routines.
The LCD not only prompts you through the programming
process, but also allows you to closely monitor a sampling routine
as it is executed. The LCD shows pertinent information about the
routine – for example, the time of the next sample and notifies
you of any problems encountered during the routine. As the
routine progresses, the sampler logs (stores) key information
about the results of the routine. The results include the start
time, any halt and resume times, time of samples, and cause of
any missed samples. This information is accessible during a
routine or after a sampling routine is finished. You can view this
information from the sampler's display or retrieve the infor-
mation with the field printer or a laptop computer running
Teledyne Isco's Samplink
The 3700s are designed to collect as many as 24 separate
sequential (discrete) samples and are fully programmable for
true composite sampling. You can collect both sequential and
composite samples at user-definable time intervals (time-pacing)
or at equal flow-volume intervals using flow pulse inputs from an
external flow meter (flow pacing). You can set the flow interval
from 1 to 9,999 flow pulses.
Both samplers offer two types of time-pacing: uniform and non-
uniform. You can take uniform time-paced samples at regular
time intervals-a sample every 15 minutes, for example. You can
set the interval between samples from 1 minute to 99 hours, 59
minutes in 1-minute increments. Using the extended pro-
g r a m m i n g m o d e , y o u c a n s p e c i f y a s m a n y a s 9 9 9 ( o r
bottle-volume dependent) nonuniform time intervals in minutes.
For example, you can program the sampler to take the first six
samples at 10-minute intervals, then four more samples at
15-minute intervals, and so on. Users can set nonuniform time
intervals from 1 to 999 minutes in 1-minute intervals. You can
specify nonuniform times in a clock-time format by entering a
time and date for each sample. The sampler will accept as many
as 99 nonuniform clock times.
Additionally, the Sampling Stop-and-Resume feature allows you
to create an intermittent sampling schedule. With this extended
programming feature, you can sample only during key periods of
the day. For example, you may wish to sample only during the
hours of 6 a.m. to 8 a.m., and 5 p.m. to 7 p.m.. You can enter as
many as 12 sampling stops and 12 resumes. You can use sam-
pling stops and resumes with both flow- and time-paced routines
and with uniform and nonuniform time intervals.
In addition to sequential sampling, which places one sample in
each bottle, the sampler provides three standard types of multi-
plexed sample distribution: samples-per-bottle multiplexing,
bottles-per-sample multiplexing, and multiple-bottle compos-
iting.
3700 Portable Samplers
Section 1 Introduction
®
software.
1-3
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