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Reference, Installation, and Operations Manual Section 6: Meter operation
3-9000-743 Rev S June 2013
Batch cycle processing 185
6.1.3 Batch cycle processing
Batch update period
Calculation updates performed by the meter, for deriving volume and velocity, are based on
batches of data samples collected from sequences of transducer firings. The batch update
period is dependent upon the user specified batch update period (SpecBatchUpdtPeriod) and
the stack size (StackSize) as shown in Tab le 6- 1. The Standard batch update period is the
default.
The actual batch update period is readable via the BatchUpdatePeriod data point.
Emission rates
The emission rate is the period between firing two different transducers. The stacked emission
rate is the period between consecutive firings of a single transducer when stacking is used (i.e.,
the stack size is not set to ‘None’).
The actual emission rates used (readable via the EmRateActual and StackEmRateActual data
points) are functions of the desired emission rates, meter type, firing sequence, stack size, and
filter status.
The user specifies the desired emission rates via the EmRateDesired and StackEmRateDesired
data points. If a desired emission rate is set to zero, the meter uses the fastest possible emission
rate (which can be as short as 4 milliseconds). Otherwise, the meter uses the fastest possible
emission rate that is not less than the desired value.
When using the Daniel MeterLink
Update Time Wizard to configure the meter (as discussed in
Section 5.7.1), EmRateDesired and StackEmRateDesired are set to zero to achieve the most
transducer firings per batch update.
Table 6-1 Actual meter update period
StackSize
1 (None) 2 4 8 16
SpecBatchUpdtPeriod
Rapid
(250 ms)
0.25 sec N/A N/A N/A N/A
Standard
(1000 ms)
1 sec 1 sec 1.5 sec 3 sec 5 sec