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Rockwell Automation Publication 1756-UM010C-EN-P - June 2021
Chapter 3 Configurable Flowmeter Module Features and Operational Modes
Total Overspeed
Use Total Overspeed to monitor when a flowmeter exceeds the Highest
Allowed Frequency. With this feature, the module calculates speed by the
number of pulses counted in a user-defined sampling period. When the speed
exceeds Highest Allowed Frequency, and the Overspeed Alarm is enabled, the
Overspeed Alarm is set.
Total Acceleration
Use Total Acceleration to monitor when a flowmeter exceeds the maximum
acceleration rate. The acceleration rate is calculated by using a three-point
difference formula with unevenly spaced points. The acceleration calculation
indicates the number of samples used in the calculation.
Prover Total
Use Prover Total to monitor the raw counts received during the Prover portion
of the cycle. The Prover Total represents a net total count value obtained by
applying a K-factor and CCF or AGA 7 compensation to the raw count.
Total Counts
Use Total Counts to monitor the total number of counts the module has
received since it was last reset to zero.
Frequency Average
Use Frequency Average when Frequency Period must be averaged over
multiple samples (meter samples). You must configure the module with a user-
defined number of Meter Samples to use this feature. This uses the total
counts over the total time per a user-defined number of meter samples.
(A meter sample is approximately 20.0 ms.)
Frequency Period
Use Frequency Period to determine the frequency over a user-defined sample
time.
