Dynasonics TFXP Series Transit Time Ultrasonic Flow Meter - Manual (Page 109)

4) What is the flow rate in GPM at 4.3 ft/sec.
0.384 gallons x 4.3 FPS x 60 sec (1min) = 99.1 GPM
Now that the volumetric flow rate is know all that is needed is an output frequency to determine
the K-factor.
Known values are:
Frequency = 700 Hz (By measurement)
Flow Rate = 99.1 GPM (By calculation)
1) 700 Hz x 60 sec = 42,000 pulses per min
2)
42,000 pulses per min
K-factor = = 423.9 pulses per gallon
99.1 GPM