Reference, Installation, and Operations Manual

Section 6: Meter operation

3-9000-743 Rev S

June 2013

 

 

 

6.1.1Terminology

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 SeniorSonicTM 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.)

Terminology

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