Table of Contents
Advertisement
3700 Portable Samplers
Section 3 Programming Guidelines
Run State – In the run state, the sampler is executing the sam-
pling routine and operating under program control. While the
sampling routine is executed, the LCD displays a number of mes-
sages communicating the sampler's progress through the
routine.
It reports the current bottle or bottle set, current time or
flow-pulse count, and remaining time or pulse count to the next
sample. These messages vary according to the sampling routine.
As the routine progresses, the sampler creates a log of sampling
results that records pertinent information about each sample
event. The results include the time and date of each sample, the
number of pump counts occurring until liquid is detected for each
sample event, and any problems encountered.You can retrieve
results with the Display Status procedure, discussed in an
upcoming section.
You can retrieve the results in the middle of a routine or when
the routine is done. The results remain in the sampler's memory
until you start the sampler again. See the section Run State for
more information.
Interactive State – The interactive state lets you program the
sampler. The interactive state contains two branches: the
program sequence and the configure sequence. Figure 3-6 dia-
grams the structure of the interactive state. The program
sequence defines the sampling routine; it allows you to enter the
interval between samples, the number of samples in each bottle,
the sample size, and the start time. The configure sequence pro-
vides a number of setup options. Some configure options provide
equipment specifications: bottle sizes, suction-line diameters and
lengths, and so on. For example, the 3700 Standard can use dif-
ferent-sized sequential bottles: 350 ml and 1000 ml. You must
enter the correct bottle size so that the sampler can calculate the
range of sample volumes for a given number of samples and
prevent overfilling. Other options allow you to set the sampler's
real-time clock, calibrate the sampler, or enable the password
program protection.
3.5.2 Programming Modes
The configure sequence also allows you to select either of the pro-
gramming modes: basic or extended.
Basic Programming – Use the basic programming mode for
conventional sampling routines. In the basic programming mode,
you can take sequential or composite samples at uniform time
intervals or at flow-pulse intervals. You can multiplex samples, if
desired; both bottles-per-sample and samples-per-bottle multi-
plexing are available. You can control the start time of the
routine by entering a specific time and date or with the
adjustable start-time delay.
Extended Programming – The extended programming mode
increases the number of available features, making more
complex sampling routines possible. For example, you can use
nonuniform time intervals, and create an intermittent sampling
schedule with the Stops and Resumes feature. Although all basic
programming features are available in the extended pro-
3-9
Advertisement
Table of Contents
