User Manual

7
Examples
Formulas for Computing Gear Plate Ratios
Example 1: Find a gear plate ratio for 7.50 pounds per
gallon.
Meter Model:------------- M7-A
Unit of Measure: -------- pounds per gallon
Packing Gland Ratio: -- 2:1
Units per Gallons: ------ 7.50
Adjuster Ratio: ---------- 3.997
N
b
x R
c
D
n
P
g
x W x R
a
D
r
= R
1
R
2
=
5.555 x 10
2 x 7.50 x 3.997
= R
1
= .9265
61 57
D
n
D
r
D
n
57
D
r61
R
2
= = = .9344
∆R = = = .85%
100 (R
1
-R
2
)
R
1
100 (.9265 - .9344)
.9265
Example 2: Find a gear plate ratio for Imperial Gallons
at 2% correction.
Meter Model:------------- M7-A
Unit of Measure: -------- whole imperial gallons
Correction Factor ------- (2%) .98
Packing Gland Ratio: -- 2:1
Units per Gallons: ------ .83267 Imperial Gallons per US
Gallon
Adjuster Ratio: ---------- 3.997
N
b
x R
c
x .98 D
n
P
g
x W x R
a
D
r
= R
1
R
2
=
5.555 x 10 x .98
2 x .83267 x 3.997
= R
1
= 8.1785
D
n
D
n
D
n
D
r
D
r
D
r
R
2
= x x
60 67 75
30 41 30
R
2
= x x = 8.1707
∆R = = = .095%
100 (R
1
-R
2
)
R
1
100 (8.1785-8.1707)
8.1785
D
n
D
r
41 67
D
n
D
r
30 60
D
n
D
r
30 75