Dynasonics TFX Ultra Transit Time Flow Meters - Manual (Page 96)

M A L E C ON D U IT FITTIN G
DY NASONICS P/ N: D005-09 38-002
STE E L CITY P/ N: L T7 01*
A R M OU R ED C ON D U IT
DY NASONICS P/ N: D002-1401-003
ANACONDA 1/ 2" UA G R AY *
* OR E Q UIVAL E NT
Figure 73: CE compliance drawing, DC power
K FACTORS EXPLAINED
The K factor (with regards to flow) is the number of pulses that must be accumulated to equal a particular volume of fluid. You
can think of each pulse as representing a small fraction of the totalizing unit.
An example might be a K factor of 1000 (pulses per gallon). This means that if you were counting pulses, when the count total
reached 1000, you would have accumulated one gallon of liquid. Using the same reasoning, each individual pulse represents
an accumulation of 1/1000 of a gallon. This relationship is independent of the time it takes to accumulate the counts.
The frequency aspect of K factors is a little more confusing because it also involves the flow rate. The same K factor number,
with a time frame added, can be converted into a flow rate. If you accumulated 1000 counts (one gallon) in one minute, then
your flow rate would be one gpm. The output frequency, in Hz, is found simply by dividing the number of counts (1000) by
the number of seconds in a minute (60) to get the output frequency.
1000 ÷ 60 = 16.6666 Hz. If you were looking at the pulse output on a frequency counter, an output frequency of 16.666
Hz would be equal to one gpm. If the frequency counter registered 33.333 Hz (2 × 16.666 Hz), then the flow rate would be
two gpm.
K FACTORS EXPLAINED
Page 96 March 2014