Calculate Scale Factor
CALCULATE SCALE FACTOR
A Scale Factor is a number used to adjust meter accuracy . The Scale Factor is set at the factory using motor oil with a viscosity
of 10W . The primary use for Scale Factor recalibration is to batch fluids with different viscosities . If the fluid has a lower
viscosity, more fluid can slip past the meter gears without being detected . Changing the Scale Factor adjusts the meter to
compensate for the loss . The meter multiplies each pulse by the Scale Factor number to correct the accuracy when it converts
to the specified units . For an approximate Scale Factor for fluids of different viscosities, see
"Chart of Approximate Scale Factors"
on page 13
.
OTEE:
N
The meter’s original Scale Factor was written on the trigger when it was calibrated at the factory . It may have been
revised after field installation . Use the Scale Factor showing on the display, not on the trigger .
CHANGING THE SCALE FACTOR WILL CHANGE THE ACCURACY OF THE METER, POTENTIALLY CAUSING IT TO OVERFILL
OR UNDER FILL. THIS HAS THE POTENTIAL TO CAUSE A MECHANICAL BREAKDOWN.
To view the current scale factor, press and hold
TOTAL
and
AUTO
simultaneously .
Absolute Scale Factor
For absolute scale factor, preform this test:
1 . Run a measured amount of fluid through the meter .
2 . If the meter delivers 4 .20 quarts and the display shows only 4 .00 quarts, then the Scale Factor needs to be adjusted .
3 . Divide what the meter delivered (4 .20) by what the display shows (4 .00) . You get an error factor of (1 .05) .
4 . The existing Scale Factor is 1 .0123, as shown in steps 1 and 2 in
"Verify Changes"
.
5 . To calculate a new factor: 1 .0123 (existing Scale Factor) x 1 .05 (error factor) = 1 .0629 (new Scale Factor) .
6 . Enter that number as described in the
"Change Scale Factor" on page 11
.
OTEE:
N
Use the Scale Factor shown on the display, not on the trigger .
Page 12
August 2015
