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Reference, Installation, and Operations Manual Section 6: Meter operation
3-9000-743 Rev S June 2013
Terminology 183
63
6.1.1 Terminology
The following terms are used in explaining the effects of transducers timing control and the
performance of batch data collection and calculation updates in the Mark III flow meter.
Figure 6-4 Update time, stack size, emission rate and filter
• Sequence - a complete cycle of firing all enabled transducers in a single round of
transducers operation (For example, in a four-chord SeniorSonic
TM
meter, there are eight
transducers, and when all eight transducers have been fired in a single round of operation,
it signifies the completion of one sequence.)
• Stacking - the process of modifying a sequence so that each individual transducer is fired x
times (where x equals the stack size) before the next transducer in the sequence is fired
• Stack size - the multiple of times each transducer is fired before the next transducer
within the sequence is fired (When stacking is absent or disabled, the stack size is actually
1, because each enabled transducer is fired once during the sequence. When stacking is
applied or enabled, it is applied in increments of 2, 4, 8, and 16 and are the only stack size
choices, so that each enabled transducer is fired 2, 4, 8, or 16 times before the next
transducer in the sequence is fired.)
• Emission rate - the time elapsed before the next transducer in a sequence is fired,
regardless of stack size (Minimum emission rate is 4 milliseconds.)
• Stack emission rate - the time elapsed before a single transducer is re-fired when stacking
is enabled (Minimum stack emission rate is 4 milliseconds.)
• Chords inactive or active - the exclusion or inclusion of a chord-forming pair of
transducers in the sequence of transducers operation
• Update time - the time elapsed, in seconds, between each processing, or recalculation of
data that is collected from sequences of transducer firings
• Batch period, or batch cycle - synonymous with Update time, as defined above
• Sample - the data that is collected from one Sequence of transducers operation (This term
is displayed in the Daniel MeterLink
Update Time Wizard screen, and is nearly synonymous
with Sequence, as defined above. That is, “Samples/update,” as displayed in the Daniel
MeterLink
Update Time Wizard screen, could be interpreted as Sequences/update.)