3410 Series Gas Ultrasonic Meters Operations Manual Section 4: Flow measurement
3-9000-777 Rev E January 2018
Batch cycle processing 21
4.2.3 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 4- 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
pipe diameter.
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 is 2 milliseconds. Otherwise, the meter uses the fastest possible
emission rate that is not less than the desired value. We recommend setting the Filter to the OFF
position.
The
Signal Analyzer (Meter|Signal Analyzer) is used to configure the EmRateDesired and StackEm-
RateDesired.
These values are set to zero to achieve the most transducer firings per batch
update.
Table 4-1 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
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