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3700 Portable Samplers
Section 3 Programming Guidelines
Example: Extended Flow-Paced Multiplexed (bottles-per-sample)
When the tenth pulse is received, the display will show the current bottle number, only.
When the pump begins to run forward to deliver the sample volume, the second line appears. After the pump
completes 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.
As the distributor moves to the next bottle, the bottle number reported in the display changes to indicate the bottle
number. The message, "PUMPING 800 ml," will remain on the display. When the distributor reaches the correct
position over the current bottle, the pump runs forward to deliver the sample volume. When the delivery is completed,
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
display will change as it receives each flow pulse.
The cycle is repeated until the sampling routine is completed.
When the routine is complete, the display will indicate the status of the routine ("DONE"), the number of sample
events, and the current time and date.
3-86
Sampling (Continued)
BOTTLES
1- 2
AFTER
1
PULSES
BOTTLE
1
BOTTLE
1
PUMPING
800 ml
BOTTLE 2
PUMPING 800 ml
BOTTLES
3- 4
AFTER
10
PULSES
↓
↓
DONE . . . 12 SAMPLES
6:10:35
21-JUN-04
In Example Flow-Paced Sampling / Time-Based Bottle Sets,
samples are to be taken at intervals of 1,000 flow pulses.
Samples will be multiplexed by placing 100 ml sample volumes
into two bottles at each sample event. To avoid missing any
samples, the sampling routine starts immediately after you press
the start sampling key. To place the bottle set changes at the top
of the hour, the sampler will be allowed to take samples until
12:00, the time of the first bottle set change. After the first
change, bottle sets will change every two hours.
NOTE: The number of samples in each bottle set will vary as the
flow rate varies. If at least one sample is desired in each bottle,
the sampler should be directed to take a sample at the start and
switch times. See the section Flow Mode Sampling, which
describes this option.
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