Instruction manual

3700R/3740 Refrigerated Sampler
Section 3 Programming Guidelines
3-34
Example Time-Paced Composite Sampling demonstrates the pro-
gramming procedures for a composite sampling routine. When
composite sampling with the 3700R, you must convert the unit
for single-bottle sampling.
After converting the 3700R, check the settings to verify the sam-
pler is configured for composite sampling. This example begins
with a demonstration of the steps needed to check the Bottles
and Sizes configure option settings. The Bottles and Sizes config-
ure settings should indicate that only one bottle is being used. Be
sure to enter the correct bottle volume. The settings used in this
example are for the 2.5 gallon (9400 ml) composite bottle avail-
able with the 3700R.
This time-paced routine will take samples at 15-minute intervals
for a 12-hour period. Sample volumes are to be 150 ml each.
When entering the program settings, you must enter the number
of samples required before entering the sample volumes. At four
samples per hour, the 12-hour period would yield 48 samples.
The total sample volume collected at the end of the routine would
be 7200 ml (48 samples
x 150 ml/sample), well within the
When the sampler receives the tenth pulse, the first line reports the current bottle number.
BOTTLE 1
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.
BOTTLE 1
PUMPING 500 ml
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.
BOTTLE 2
PUMPING 500 ml
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.
BOTTLE 3-4
AFTER 10 PULSES
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.
DONE . . . 12 SAMPLES
6:10:35 21-JUN-04
Example: Flow-Paced Multiplexed (bottles-per-sample) Sampling