Emerson Daniel 3414 - Page 96

A.2 K-Factor and inverse K-Factor conversions
Equation A-1: Frequency volumetric flow rate K-Factor
KFactor =
FreqQ
FullScale
(MaxFreq)3600s § ℎr
( * )
and
Equation A-2: Frequency volumetric flow rate inverse K-Factor
InvKFactor =
(MaxFreq)(3600s § ℎr)
( * )
FreqQ
FullScale
where
KFactor = frequency “K-Factor” (pulses/volume**) (Freq1KFactor and Freq2KFactor)
InvKFactor = frequency “Inverse K-Factor” (volume**/pulse) (Freq1InvKFactor and
Freq2InvKFactor)
FreqQ
FullScale
= frequency full-scale volumetric flow rate (volume**/time unit*)
(Freq1FullScaleVolFlowRate and Freq2FullScaleVolFlowRate)
MaxFreq = maximum frequency (Hz = pulses/time unit*) (Freq1MaxFrequency and
Freq2MaxFrequency)
(*) TimeUnit = time conversion factor depends on the VolFlowRate Time Unit data point:
• volume/second = 1 s/s
• volume/minute = 60 s/m
• volume/hour = 3600 s/h
• volume/day = 86400 s/d
(**) Volume = where the volume is selected via data points:
• Units System
• VolUnitUS
— gallons
— barrels
• VolUnitMetric
— cubic meters
— liters
Conversion factors Maintenance and Troubleshooting manual
July 2020 3-9000-769
96 Gas Ultrasonic Flow Meters