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1.2.4 Master/Slave Sampling
1.2.5 Accurate Sample
Volumes
1.2.6 Flexible Start Times
stream for "storm" conditions- a specific amount of rainfall, for
example - and enable the sampler when it detects those condi-
tions.
A notable feature is the master/slave setting, which allows you to
operate two 3700 Samplers as a master/slave pair. Master/slave
sampler pairing doubles the capacity of a sampling installation
and to perform continuous sampling.
Two samplers can be connected so that one sampler (the master)
inhibits the operation of the second sampler (the slave) until the
master completes its sampling routine. The samplers then
reverse roles. You can service a full sampler while its counterpart
is running a routine. In some applications, master/slave pairs
can reduce the number of visits to an installation. A reduced
number of visits is important when considering the costs and
safety of a sampling study.
Master/Slave STORM Sampling – The 3700 Sampler provides
a STORM variant of master/slave sampling. In STORM sam-
pling, the master sampler enables the slave sampler when the
master sampler completes its STORM routine. The slave sampler
then completes its routine but does not enable the first sampler
at the end of the slave routine. The slave's routine is normally a
flow-paced a routine, not another STORM routine. The STORM
variant of master/slave sampling allows you to both increase the
total volume of samples collected and extend the sampling time
period.
You can program the sampler to take sample volumes of 10 to
9,990 milliliters. Equipped with the LD90 liquid presence
detector, the 3700s deliver accurate, repeatable sample volumes
in changi ng head condi ti ons. The LD 90 is a nonwetted
liquid-presence detector. It detects virtually any pumpable
liquid, and, because it is nonwetted, sample conductivity, vis-
cosity, temperature, and composition do not affect detection.
Although it is not normally necessary, you can calibrate samples
if you wish.
You can program a sampling routine to use a specific start time
and date or a start time delay. The sampler will accept a specific
start time and date up to one month beyond the current date.
The start-time delay is the period between the time you press the
start sampling key and the time the routine actually starts. You
can adjust it from 0 (zero) to 9,999 minutes.
Other features are available. Program storage allows you to store
as many as three separate programs, eliminating the need to
reprogram the sampler for recurrent sampling routines. A
program lock prevents unauthorized program alterations. When
the lock is enabled, users must enter a password before they can
change any program settings, although they can view the pro-
gramed settings at any time.
3700 Portable Samplers
Section 1 Introduction
1-5
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