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Calculate scale factor
10. 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. The reading is then always correct.
For an approximate scale factor for fluids of different viscosities, consult the chart on page
36.
NOTE: 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 the
10.1 Absolute scale factor
For absolute scale factor, perform 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
current scale factor", above.
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 "Change scale factor".
NOTE: Use the scale factor showing on the display, not on the trigger.
button and the
scale
factor
is
LM_OGP2Adv_BA_89_1008
button at the same time.
1.0123,
as
shown
page 35/92
under
"To
view
the
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