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Avalanche Portable Refrigerated Sampler
Section 5 Extended Programming
The sampling retries feature lets you set the number of times,
from 0 to 3, that the sampler tries to detect liquid in the line
before skipping the sample.
__ RINSE CYCLES
(0-3)
RETRY UP TO __ TIMES
WHEN SAMPLING
(0-3)
5.8 Pacing
Sample pacing is the rate at which the sampler takes samples.
Depending on the type of pacing you select, the rate is controlled
by the sampler’s internal clock or by inputs received from connected instruments.
Standard programming provides time pacing and flow pacing,
which are described in Section 4. Extended programming provides additional pacing types, so its pacing screen has four items
listed instead of two.
“Uniform time” pacing is identical to “time” pacing in standard
programming with one exception. Uniform time pacing adds the
ability to collect flow-proportional sample volumes. “Flow paced”
is the same for both types of programming. Event paced and nonuniform time pacing are described below.
5.8.1 Event Pacing
Up to fourteen event conditions can be defined (for two-part programs, up to fourteen event conditions can be defined for each
part). An event occurs when any of the programmed event conditions becomes true. By default, event paced sampling uses a
sequential distribution scheme, meaning that each time an event
occurs the sampler takes one sample and places it in one bottle.
However, any distribution setting can be selected with event
paced sampling.
UNIFORM TIME PACE
FLOW PACED
EVENT PACED
NONUNIFORM TIME
To program the sampler for event pacing, select event paced.
Refer to the example “Event Paced Sampling” for a program that
uses three event conditions. This example uses a sampler with an
attached 730 Bubbler Flow Module, Rain Gauge, and an SDI-12
sonde at address 5 with four parameters.
If you have programmed multiple conditions, and more than one
condition comes true at the same time (within your measurement
interval), one sample will be taken and all conditions that caused
the event will be noted on reports.
The “Event Paced Sampling” example uses rate of change for an
event condition (see step 7). This feature enables the event condition under specific circumstances.
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