Liquid Controls Gear Plate Selection User Manual
Installation & Parts Manual
Gear Plate Selection Guide
Installation: M100-30
www.lcmeter.com
Table of Contents
Description Page Number
Gear Plate Selection Guide....................................................3
General Meter Data ..................................................... 3
Packing Gland Ratio...............................................................4
Pattern Codes..............................................................4
Gears .....................................................................................5
Gear Limitations ..........................................................5
Available Gears ........................................................... 5
Register St ack Components ........................................5
Units per Revolution ....................................................5
Formulas for Computing Gear Plate Ratios............................6-7
Gear Plate Assembly Drawings.............................................. 8-11
Pattern 10 Long Shaft..................................................8
Pattern 10 Short Shaft ................................................. 9
Pattern 20, 30, 40, & 50 Long Shaft ............................10
Pattern 20, 30, 40, & 50 Short Shaft............................ 11
Parts List ................................................................................12
Gear Plate Assemblies: Patterns 10, 20, 30, 40, & 50.12
Gear Plate Assemblies: Patterns 20, 30, 40, & 50.......12
Basic Gear Plate Part Numbers for Pattern Styles ......12
Change Gear Part Numbers........................................ 12
Swing Arm Assembly Drawings.............................................. 13-14
Gear Plates by Meter Size & Unit of Measure........................ 15
M-5 Gear Plate Listing............................................................16-17
M-7 & M-10 Gear Plate Listing ...............................................17-19
M-15 & M-25 Gear Plate Listing .............................................20
M-30 & M-40 Gear Plate Listing .............................................21-22
M-60, MS-75 & M-120 Gear Plate Listing...............................23
2
Gear Plate Selection Guide
Gear plates are used to convert a meter’s output to the desired unit of measure; for example, 1/10 or whole US
gallons, 1/10 or whole imperial gallons, liters, cubic meters, barrels, pounds, etc. To facilitate the changing of the unit
of measure desired, the gear plate is attached to the base of the large numeral counter with two screws. To make
proper gear plate selection, you will need to know:
1. Meter size
2. Unit of measure required
3. Packing gland ratio
4. Meter register stack components (preset, TVC, counter, ticket printer, etc.)
General Meter Data
• M-5, M-7, and M-10 meters supplied standard with 1/10 gallon, Pattern 10 gear plates.
• M-15 and M-25 meters supplied standard with 1/10 gallon, Pattern 20 gear plates.
• M-25, M-30, M-40, M-60, and M-80 meters supplied standard with Whole Gallon, Pattern 10 gear plates.
• When deviating from above standards, see appropriate meter price list for correct pricing.
• Any meter model incorporating a T emperature V olume Compensator requires an even centered gear plate (Pattern
10, 30, or 50).
• Meter models supplied with Class 10 and 12 construction are configured using a Pattern 30 gear plate.
• Consult Customer Support Department at the factory for gear plate ratios not listed on pages 15 through 23.
Meter Size Revolutions per
gallon of the
blocking rotor
M-5 (New Style)--------------------- 4.0790
M-5 (Old Style) ---------------------12.2370
M-7 ------------------------------------- 5.555
M-10 ----------------------------------- 5.555
M-15 ----------------------------------- 2.058
M-20* ---------------------------------- 2.058
M-25 ----------------------------------- 2.058
M-30 ----------------------------------- 0.742
M-40 ----------------------------------- 0.742
M-60 (New Style) ------------------- 0.3983
M-60 (Old Style)--------------------- 0.2545
M-70 ----------------------------------- 0.4024
M-80 ----------------------------------- 0.3983
M-120---------------------------------- 0.1579
*M-20 meter uses only 2:1 packing glands. Consult Customer Service Department at the factory for proper gear plates.
Meter Size Revolutions per
gallon of the
blocking rotor
MS-5 ------------------------------------ 12.2370
MS-7 -------------------------------------- 5.555
MS-15 ------------------------------------2.058
MS-25 ------------------------------------2.058
MS-30 ------------------------------------0.742
MS-40 ------------------------------------0.742
MS-75 ------------------------------------0.2545
MS-120----------------------------------- 0.1579
3
Packing Gland Ratio
Three packing gland ratios are available to permit achieving the proper RPM of the register unit wheel (right hand wheel).
Pattern Codes
The Pattern Code number diagram shows five general gear assembly configurations that can be constructed using the
basic gear plate and swing arm assemblies. Patterns 10, 30, and 50 can be used with a mechanical temperature
compensator.
Dr=Driving gear, Dn=Driven gear, I=Idler gear
Pattern 10 - shows the simplest gear plate form with a driver and a driven gear. Tot al teeth of gear A
plus gear B must equal 118. (A=Dr, B=Dn)
Pattern 20 - shows the simple gear plate form with an idler gear added to reverse output
rotation. Do not use when a mechanical temperature compensator is used.
(A=Dr, B=I, C=Dn)
Pattern 30 - shows a plate with dual idler gears. This pattern is used when a
T emperature V olume Compensator (TVC) is part of the register stack. When the register
stack includes a TVC, you must have an even number of centers in the gear plate.
When looking down on the Adjuster, rotation should be counterclockwise. (A=Dr, B=I,
C=I, D=Dn)
Pattern 40 - shows a plate with a compound gear set (B/C). Do not use when a mechanical
temperature compensator is used.
Pattern 50 - shows a plate with dual compound gears (B/C) and (D/E). This gear
plate configuration is used:
1. When a TVC is part of the register stack, when the register stack includes a
TVC, you must have an even number of centers in the gear plate; when looking
down on the Adjuster, rotation should be counterclockwise.
2. When you cannot obtain the desired ratio with only two sets of gears.
4
Gear Limitations Available Gears
• Adjuster Reduction: 3.997:1 at 25% setting.
• Two Gear Ratio Capacity: Pattern 10 must equal 1 18
total teeth.
• Idler Arm Capacity: Patterns 20, 30, 40, & 50: 114
teeth maximum, 72 teeth minimum.
C - D
A - B E - F A C E
Typical Six Gear Ratio - Pattern 50
A+B equal to or greater than 72 teeth.
A+B equal to or less than 114 teeth.
E+F equal to or greater than 72 teeth.
E+F equal to or less than 114 teeth.
B+E+5 teeth equal to or less than C+D.
C+26 teeth equal to or less than A+B.
D+26 teeth equal to or less than E+F.
A+F equal to or less than 113 teeth.
A+F equal to 118 teeth on two gear ratio.
B D F
X X = Ratio
Standard gears range from 30 to 69 teeth inclusive. Other
gears available are listed below.
No. of Teeth Part Number
19 --------------------------- V-2324
20 --------------------------- V-6180
26 --------------------------- V-6190
28 --------------------------- V-2328
29 --------------------------- V-2332
59 --------------------------- V-2452
59 (60T. P.D.) ------------ V-2454
69 --------------------------- V-2492
69 (70T. P.D.) ------------ V-4572
70 --------------------------- V-2496
72 --------------------------- V-2500
75 --------------------------- V-2504
76 --------------------------- V-2508
78 --------------------------- V-2512
80 --------------------------- V-2516
84 --------------------------- V-2520
90 --------------------------- V-2524
Gears
Register Stack Components
Units per Revolution
The right hand wheel of the register determines the unit
of measure.
NOTE: the right hand register wheel (units wheel) must
not exceed 250 revolutions per minute (RPM) or 125 RPM
when the meter is equipped with a preset. There are
three packing glands available to achieve the proper
RPM. 1:1, 2:1, or 3:1.
1/10 Units Wheel
or 1 Unit/Rev. with
Decimal Point
Whole Unit Wheel
or 10 Units/Rev.
No Decimal Point
1 Barrel Wheel
or 1 Unit/Rev.
or 100 Units/Rev.
5
Formulas for Computing Gear Plate Ratios
Nb x R
Pg x W x R
1. Nb = Revolutions per gallon of the blocking rotor.
Meter Model Nb Value
M-5 (old style) ------------- 4.0790
M-5 (new style)---------- 12.2370
MS-5 ----------------------- 12.2370
M-7 --------------------------- 5.555
MS-7 ------------------------- 5.555
M-10 ------------------------- 5.555
M-15 ------------------------- 2.058
MS-15 ----------------------- 2.058
*M-20 ------------------------ 2.058
M-25 ------------------------- 2.058
M-30 ------------------------- 0.742
MS-30 ----------------------- 0.742
M-40 ------------------------- 0.742
M-60 (new style)---------- 0.3983
M-60 (old style) ----------- 0.2545
M-70 ------------------------- 0.4024
MS-75 ----------------------- 0.2545
M-120------------------------ 0.1579
MS-120---------------------- 0.1579
*M-20 uses only 2:1 packing glands. Consult the
Customer Service Department at the factory for proper
gear plate selection.
c
= R1 R2=
a
D
n
D
r
7. R2 = Dn divided by Dr, which is the actual ratio.
8. Dn = Driven gear.
9. Dr = Driving gear
10. For 20% correction, multiply the gear plate ratio, R1,
by .98 as in the following example:
Nb x Rc x .98
11. The % difference of the actual ratio (R2) cannot be
greater than or less than 1% of the desired ratio.
100 (R1-R2)
∆R = = % difference in ratios
NOTE: To convert specific gravity to pounds, use the
following example.
For a specific gravity of 0.893:
R
1
= R
1
2. Rc = Number of units per revolution of the right-hand
wheel of the counter. For a counter to read in 10th
gallons, the unit per revolution of the right-hand wheel
is 1 gallon. For a counter to read in pounds, the unit
per revolution of the right-hand wheel is 10 pounds.
Refer to the units per revolution on page 5.
3. Pg = Packing gland ratio; 1:1, 2:1, or 3:1.
4. W = Units per gallon. For example; pounds per gallon
or kilograms per gallon. If the counter reads in
gallons, this value is 1.
5. Ra = Adjuster ratio = 3.997.
6. R1 = Gear plate ration desired.
0.893 x 8.3453 = 7.452 pounds per gallon.
Water weighs 8.3453 pounds per gallon and has a
specific gravity of 1.000.
6
Formulas for Computing Gear Plate Ratios
Examples
Example 1: Find a gear plate ratio for 7.50 pounds per
gallon.
Example 2: Find a gear plate ratio for Imperial Gallons
at 2% correction.
Meter Model:------------- M7-A
Unit of Measure: -------- pounds per gallon
Packing Gland Ratio:-- 2:1
Units per Gallons: ------ 7.50
Adjuster Ratio: ---------- 3.997
Nb x R
Pg x W x R
5.555 x 10
2 x 7.50 x 3.997
c
R2 = = = .9344
= R1 R2 =
a
D
n
D
r61
61 57
D
r
= R1 = .9265
57
D
n
D
D
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
n
r
Adjuster Ratio: ---------- 3.997
Nb x Rc x .98 D
Pg x W x R
5.555 x 10 x .98
2 x .83267 x 3.997
R2 = x x
= R1 R2 =
a
= R1 = 8.1785
D
D
D
n
D
r
n
D
r
D
n
r
n
D
r
100 (R1-R2)
∆R = = = .85%
R
1
100 (.9265 - .9344)
.9265
60 67 75
R2 = x x = 8.1707
30 41 30
100 (R1-R2)
∆R = = = .095%
R
1
30 60
D
r
100 (8.1785-8.1707)
8.1785
D
r
41 67
D
n
D
n
30 75
D
r
D
n
7
Gear Plate Assemblies
Pattern 10, Long Shaft (LC Preset)
8
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