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Form 403760 Page Number - 12
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 scale factor chart.
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.
To view the current Scale Factor:
1. Press and hold the button and the button at the same time.
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 Scale Factor is 1.0123, as shown in steps 1 and 2 in “To view the 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.
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 order call 1-800-548-1191 or visit www.partdeal.com - info@partdeal.com
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