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3700 Portable Samplers
Appendix F Glossary
Bottles per sample – Bottles per sample is the number of
bottles receiving sample volumes at each sample event.
Composite sampling – In composite sampling, multiple sample
volumes are placed in bottle sets. Typically, composite sampling
uses a single container. A composite sample represents an
average of the characteristics of the flow stream for the elapsed
time of sampling.
Controller – The controller, housed within the molded control
box, is a collection of electronic components, which govern the
actions of the sampler. It includes the microprocessor, RAM
(Random Access Memory), ROM (Read Only Memory) and its
imbedded software, the LCD (Liquid Crystal Display), and the
keypad.
Cross contamination – Cross contamination occurs when por-
tions of previous samples are mixed with the current sample. For
example, cross contamination results when residual amounts of
sample remain in the suction line or pump tube from a previous
sample event.
Event mark – An event mark is a signal that the sampler sends
to a flow meter or other device a each sample event. Each time
the flow meter receives an event mark pulse, the flow meter
places a mark on the its recording chart. Marking the recording
chart cross-references the charted flow with the sample events.
Multiplex sampling – There are two types of multiplexing:
samples per bottle and bottles per sample. In samples per bottle
multiplexing, a bottle receives samples from more than one
sample event. In bottles per sample multiplexing, equal sample
volumes are placed in more than one bottle at each sample event.
Post-sample purge – Post-sample purge refers to the suction
line purge that follows the delivery of the sample volume(s). It is
also called post-purge.
Pre-sample purge – Pre-sample purge refers to the suction line
purge that precedes the delivery of the sample volume(s). It is
also called pre- purge.
Real-time clock – A real-time clock can be set to the actual time
and date.
Sample event – A sample event consists of the complete sam-
pling cycle resulting in the collection and distribution of one or
more equal sample volumes. A sample event includes pre-sample
and post-sample purges, line rinses, liquid detection retries, and
deliveries of sample volumes. No more than one sample volume is
placed in any one bottle during a sample event.
F-1
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