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7-2 Calculating the K Factors.
7-2 Calculating the K Factors.
The following steps are the recommended
procedure forcalculating the K Factors. Take
your time and go through the procedure slow-
ly at fi rst. After several tries you should be
fairly adept at calculating the K Factor for any
given input.
7-2.1 Calculating the K Factor for Digital Pulse
7-2.1 Calculating the K Factor for Digital Pulse
Inputs.
Inputs.
Given the sensor K-factor and desired deci-
mal point position for the Total (Count) display
calculate the K-Factor as follows:
Step 1.
From the documentation provided
with the fl ow sensor, determine
the average sensor K-factor.
Example : Sensor K-factor = 122 pulses/gal-
lon which means the sensor
produces 122 pulses for each
gallon passing through the fl ow-
meter.
Step 2.
Determine the necessary DPF for
the desired total decimal point loca-
tion you wish to use in displaying
total on the instrument from the fol-
lowing table:
DPF Table
Desired Total
Decimal Location:
DPF
XXXXXX.
1
XXXXX.X
10
XXXX.XX
100
XXX.XXX
1000
XX.XXXX
10000
X.XXXXX
100000
Example: for X.X, DPF = 10
Step 3.
The Count K Factor may be computed
as follows:
Count K-Factor = Sensor K-Factor
DPF
Example:
Count K-Factor of 122/10 = 12.2
Step 4.
Enter the Count K-Factor as de-
scribed in Section 3-3 referencing
the Programming Flowchart (3-4)
as needed.
Step 5.
Determine the necessary TF (time
factor) given the fl ow rate time base
you wish to have displayed on the
device using the following table:
TIME FACTOR (TF)
TIME FACTOR (TF) TABLE
Rate Display Desired
Rate Display Desired
TF
Rate / second
1
Rate / minute
60
Rate / hour
3600
Rate / day
86400
Example:
For display of rate per minute;
TF = 60
Step 6.
Compute the Rate K-Factor from
the average sensor K-Factor and
the TF selected.
Rate K-Factor = Sensor K-Factor
TF
Example:
Rate per minute:
Rate K-Factor = 122 = 2.0333
60
Step 7.
Enter the Rate K-Factor as de-
scribed in Section 3-3 referencing
the Programming Flowchart (3-4) as
needed.
