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3.8 Basic Programming
Procedure
The steps for programming the sampler in basic mode follow the
procedure outlined below.
1. Turn on the sampler with the
always "wakes up" in the standby state. The "STANDBY"
message will appear. If the sampler is turned off while run-
ning a routine, the "PROGRAM HALTED" message will be
displayed. Both messages indicate the sampler is in
standby.
2. Press the
/
ENTER
PROGRAM
state. Select "program." Refer to Figure 3-8 for displays
noted in Steps 3 to 6.
To return to a previous display when programming the
sampler, press the exit program key. The sampler will
return to standby. Press the
reenter the interactive state. Continue to press the
/
key to scroll through the displays until
ENTER
PROGRAM
you locate the display in question.
Enter the Sample Pacing settings. The sampler will
prompt you to select either time- or flow-pacing. Depending
on your selection, you will then be prompted to enter the
time- or flow-pulse interval between samples.
Note
If you will be using very short sample intervals, be sure the
interval is longer than the duration of the sampling cycle. For
truly representative sampling, the interval in either time- or
flow-paced sampling should be longer than the duration of the
sampling cycle. If the intervals are too short, you will not miss
any sample events, although some events will occur at
improper times. You can determine the duration of the cycle by
programming the sampler with the desired settings, pressing
the manual sample key, and timing the cycle.
When programming the sampler for flow pacing, you must
enter the number of pulses that make up the flow interval.
If the flow meter has been set to send a pulse once every
1,000 gallons, you can program the sampler to collect a
sample once every 1,000 gallons by entering a flow pulse
interval of "1." To collect a sample once every 50,000 gal-
lons, you would enter a sample interval of 50 pulses.
Appendix E discusses some of the calculations needed
when determining flow-pulse intervals.
3. Enter the Sample Distribution settings. The settings in the
Sample Distribution section allow you to perform sequen-
tial or multiplexed sampling. The first display of the Sam-
ple Distribution section asks whether you want to
multiplex samples. If you want simple sequential sampling
– one sample per bottle – select "NO." The sampler will
then prompt you for the Sample Volume settings.
If you want to use bottles-per-sample or samples-per-bottle
multiplexing, select "YES." The next display will prompt
you to select either "BOTTLES PER SAMPLE" or "SAM-
3700 Portable Samplers
Section 3 Programming Guidelines
/
key. The sampler
ON
OFF
key to access the interactive
/
key again to
ENTER
PROGRAM
3-21
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