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Example: Flow-Paced Multiplexed (bottles-per-sample) Sampling
When the scheduled start time arrives, the sampler begins to count flow pulses. This display indicates the bottles that
will receive sample volumes at the upcoming sample event. (If the bottle set consisted of four bottles, the first line of
the display would read, "BOTTLES 1 to 4.") The second line displays the number of flow pulses remaining until the
sample event.
The second line of the display changes as each flow pulse is received.
This display shows one pulse remaining until the sample event.
When the sampler receives the tenth pulse, the first line reports the current bottle number.
When the pump begins to run forward to deliver the sample volume, the second line appears. After the pump com-
pletes the sample delivery, it reverses to purge the liquid from the pump tube past the liquid detector. The suction line
is not completely purged; instead, the liquid is pumped just past the liquid detector. At the end of the pump-tube
purge, the distributor moves to the next bottle of the set. The display remains unchanged until the distributor relocates
to the next bottle of the set.
When the distributor relocates above the next bottle, the bottle number reported in the display changes to indicate the
bottle number. The message, "PUMPING 500 ml," will remain on the display. When the distributor reaches the correct
position over the second bottle, the pump delivers the sample volume. When the delivery is done, the pump reverses
to complete the post-sample purge.
At the end of the post-sample purge, the display changes to indicate the bottle numbers of the next bottle set. The dis-
play will change as it receives each flow pulse.
The cycle repeats until the sampling routine is completed.
When the routine is complete, the display indicates the status ("DONE"), the number of sample events, and the cur-
rent time and date.
START FLOW COUNT
AT 5:00
10:37:23
BOTTLES
1- 2
AFTER
10
PULSES
BOTTLES
1- 2
AFTER
9
PULSES
↓
↓
BOTTLES
1- 2
AFTER
1
PULSES
BOTTLE
1
BOTTLE
1
PUMPING 500 ml
BOTTLE 2
PUMPING 500 ml
BOTTLE
3-4
AFTER
10
PULSES
↓
↓
DONE . . . 12 SAMPLES
6:10:35
21-JUN-04
3700 Portable Samplers
Section 3 Programming Guidelines
3-33
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