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3700 Portable Samplers
Section 3 Programming Guidelines
3.10.3 Extended Mode
Sample Volumes
3.10.4 Extended Mode Key
Times
3-58
used to specify the type of switches are shown in the Sample Dis-
tribution section of Figures 3-10, 3-11, and 3-12. Display #40
allows you to select either "TIME" or "SAMPLES." If you select
"TIME," the bottles can be changed after a programmed period of
time. If you select "SAMPLES," the bottles can be switched after
a programmed number of samples. In Display #41, which allows
you to switch bottle sets, you can select either "TIME" or
"SAMPLES/BTL." If you select "TIME," the bottle sets can be
changed after a programmed period of time. If you select
"SAMPLES/BTL," the bottle sets can be changed after a pro-
grammed number of samples. You can use select either "TIME,"
"SAMPLES," or "SAMPLE/BTL" settings with both time- and
flow-paced sampling.
The extended mode Sample Volumes section is identical to the
basic Sample Volume section.
The extended mode Key Times section has two additional sets of
displays which allow you to specify the time of the first bottle or
bottle set change and to set up the sampling stop and resume
times.
First Switch Time – The first switch time displays will appear
only when you have specified bottle or bottle set changes based
on time in the Sample Distribution section. If you select "TIME"
rather than "SAMPLES" in the "CHANGE SETS BASED ON
[TIME, SAMPLES]" display, you first will be asked if you want to
enter a setting for the first switch time. If you respond "YES," you
will be prompted for the time of the first bottle or set change. The
first time-switch displays are indicated by Display #s 95, 46, and
47 in Figure 3-11.
The first switch- time setting allows you to control the times of
each bottle switch without delaying the routine and thereby
missing samples. For example, if you have programmed the
sampler for time switches every hour and you want the switches
to occur on the hour, you can set the time of the first switch at the
next even hour, start the sampling routine early, and deposit
samples in the first bottle set until the first switch time. At the
first switch time, the distributor moves to the next bottle set. The
first bottle set may not be completely filled; however, by starting
the routine early, you can sample until the bottle switches are
placed "on schedule" to avoid missing any samples. If you do not
enter a first switch time, the sampler will begin timing the
switch interval from the start time for the routine and the first
bottle or bottle set will receive samples for the full time period.
Switch times are not available in STORM routines.
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