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6712SR Refrigerated Sampler
Section 5 Extended Programming
5-31
• 3-second pulse at the beginning of forward pumping
only, marking the time the sampler deposited the
sample.
• Variable duration pulse generated during the pump
cycle, from the beginning of the pre-sample purge to the
end of the postsample purge.
• Variable duration pulse generated only during forward
pumping.
Figure 5-5 shows event mark timing diagrams.
Bottle Number – Concurrent with the event mark, the sampler
also sends a bottle number signal. The bottle number signal is a
series of pulses. The number of pulses sent represents the bottle
currently accepting a sample (see Figure 5-5).
Figure 5-5 Event Mark Timing Diagram
5.18.5 Pre-sample and
Post-sample Purge
Counts
The pre-sample purge is when the pump runs in reverse clearing
the strainer of any debris before taking a sample. The pre-sample
purge is set at 200 pump counts. After the sample is taken a
post-sample purge occurs to clear the liquid from the suction line.
The duration of the post-sample purge is determined by the
length of the suction line to maximize the battery life. The pre-
and post-sample purge can also be manually set.
Presample Purge Rinse Cycle Pump Volume 1 Pump Volume 2 Pump Volume 3 Postsample Purge
Event Mark
Event Mark
Bottle Number
Event Mark
Bottle Number
Bottle Number
Pulse at Beginning of
Presample Purge
Pulse at Beginning of
Forward Pumping
Variable Duration Pulse
During Entire Pump
Event Mark
Bottle Number
Variable Duration Pulse
During Forward
Pumping
This diagram shows the pulses sent for a bottles-per-sample distribution scheme
PRE-SAMPLE PURGE:
____COUNTS
(10-9999)
POST-SAMPLE PURGE:
DEPENDENT ON HEAD
FIXED COUNT
POST-SAMPLE PURGE:
____COUNTS
(10-9999)