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3700 Portable Samplers
Section 3 Programming Guidelines
3-22
PLES PER BOTTLE."
Bottles-per-sample multiplexing is useful if you require a
sample volume greater than the capacity of a single bottle,
or where various types of preservatives must be added to
the samples. Samples-per-bottle multiplexing is useful
when you want to collect a series of small composite sam-
ples. For example, you can collect four samples at
15-minute intervals in each bottle, resulting in a series of
hourly composite samples. Section 3.2 discusses the types
of multiplexing.
4. Enter the Sample Volume settings. Depending on the selec-
tions you make in the configure sequence, it may contain
prompts for the suction head and sampler calibration.
When entering the sample volume, keep in mind the ± 10
ml sample volume repeatability. Because the entered vol-
ume is a "nominal" value, it is prudent to calculate a total
sample volume that is somewhat less than the volumetric
capacity of the bottle as a safety factor.
This will minimize the effects of cumulative error. Refer to
Section 3.9.2 for notes on cumulative error and bottle size.
If you are using bottles-per-sample multiplexing to add
preservatives to consecutive samples, be sure to consider
the volume of the preservative into account.
Suction Head- You can configure the sampler, through the
Liquid Detector configure option, to add the suction-head
setting to the program sequence. The suction-head display
will appear after you enter the sample volume. However,
when the head is unknown or variable, omit the suc-
tion-head setting by disabling that setting in the Liquid
Detector configure option. By disabling the setting, you
allow the liquid detector to determine the operating suc-
tion head each time a sample is taken.
Calibration Settings- If you want to calibrate the sample
volume, you must enable the calibration option. To enable
this option, select "ENABLE" in the Calibrate Sampler
configure option. Enabling the option will add the calibra-
tion displays to the Sample Volume Program section. The
calibration displays are shown in Example Calibration.
5. Enter the Key Times settings. In the basic programming
mode, you will be asked if you want to enter a start time for
the routine. If you select "YES," you will be prompted to
enter a specific start time and date. If you select "NO," the
sampler will use the start-time delay. The start-time delay
can be set from 0 to 9,999 minutes in the Start-Time Delay
configure option. When you select "NO," the routine will
start according to the delay setting in the Start Time Delay
configure option. The time remaining between the time you
press the
START SAMPLING
pass before the delay countdown begins. In other words,
with a start-time delay of one minute, if you press the
key at 10:05:30, the routine will begin the
START SAMPLING
1-minute countdown at 10:05:00 and start the routine at
10:06:00.
key and the next full minute will
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