Owner's manual

gpm Average Frequency **UUT Hz Counts/GAL UUT K (Hz × 60)/NK gpm Error (% FS)
15.00 769.7 3078.59 14.90 –0.65
9.06 466.1 3086.75 9.03 –0.38
5.49 285.2 3118.64 5.52 0.65
3.32 171.7 3103.95 3.32 0.17
2.00 103.6 3101.80 2.01 0.10
**UUT = Unit Under Test
If this meter produced an actual linear output, the K factor calculation for the Unit Under Test would be exactly the same for
each measurement point. Inspection of the UUT K in the example provided shows that this is not the case and indicates that
this meter is not a perfectly linear device.
Many programmable displays allow for linearization and can provide a better match of the displayed flow values with the
actual flow values by incorporating more measurement points. In the example, the unit would be programmed for six points,
the five data points and a zero point, and use pairs of input values to accomplish the linearization.
DEFAULT K FACTOR VALUES
Meter Size Default K factor Lower Limit Upper Limit
3⁄8 in. 20,000 16,000 24,000
1/2 in. 13,000 10,400 15,600
3/4 in. 2750 2200 3300
7⁄8 in. 2686 2148 3223
1 in. 870.0 696.0 1044
1-1/2 in. 330.0 264.0 396.0
2 in. 52.0 41.6 62.0
3 in. 57.0 45.6 68.0
4 in. 29.0 23.2 35.0
6 in. 7.0 5.6 8.0
8 in. 3.0 2.4 4.0
10 in. 1.6 1.3 2.0
Programming Manual
Page 19 November 2013