Calculate scale factor
page 11/20
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 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, on page 8.
NOTE:
Use the scale factor showing on the display, not on the trigger.
Chart of approximate scale factors for fluids of different viscosities
Scale factor
Viscosity in centistokes at 65°
Samples of fluids, viscosities and scale factors
Fluid
Viscosity Scale factor
1 Water / anti freeze
5
1.044
2 Anti frezze
18
1.007
3 Brake fluid
42
1.004
4 ATF
80
1.002
5 10W
140
1.000
6 80W-90
450
0.999
7 140W
1800
0.993
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