Indexes, Index Boxes, Security Seals and Hardware · Indexes, Index Boxes, Security Seals and...

PL 3800.1

Indexes, Index Boxes,Security Seals and Hardware

Parts List

Types of Indexes

A gas meter is an accurate measuring instrument. Gasmeters are generally read on a monthly basis and the consumption is determined by subtracting the previousmeter reading from the current reading. The part of a meterthat indicates the amount of gas used is called an index.American Meter offers circle- and odometer-type indexesas shown below.

Circle-Type Index

Odometer-Type Index

2

Reading Circle-Type IndexesThe index of a gas meter looks quite complicated, but it isreally a very simple device. If your meter has a circle-typeindex with pointers (as shown below), and the pointer isbetween two numbers, the number read is always thelower of the two numbers. The one exception from this is if the pointer is between 9 and 0 (zero). If this is the case,the 9 is read because zero represents the completion of acycle. If the pointer is directly on a number, check the dialto the right. If the dial to the right has not passed zero,record the lower number for the dial on the left. To obtain a reading, read the dials right to left, recording the numbersin the same order, right to left.

The reading for the index shown above is 5678. Thismeans that 5,678 hundred cubic feet of gas has passedthrough the meter since all the dials were on zero. Anotherway to write this is 567,800 cubic feet.

Reading Odometer-Type IndexesThe other type of meter index is called an odometer-, ordirect-reading, index. This type of index works much likethe odometer on your car. To take a reading, simply readeach number shown. Each of the numbers correlates toone of the dials shown.

The reading of the odometer-type index shown above is2376 hundred cubic feet, or 237,600 cubic feet.

Types of Indexes continued

3

Proving Circles / Flow RateThe set of dials showing “Half Foot”, “Two Foot”, “FiveFoot”, and so on are not used in the meter reading. Thesedials, called “proving dials”, are used for testing purposes.In addition, they can be used to determine the flow ratethrough a meter during a specific time period. In order todo this, simply use a stopwatch to determine the time ittakes for the pointer to make one complete revolution. You then use this time and the volume indicated by this dialto calculate the flow rate through the meter. For example, if it takes 18 seconds for a half-foot pointer to make onerevolution, the actual flow rate per hour through the meterduring this time period is equal to 100 acfh. The exampleto the right shows how this is calculated.

Temperature-Compensated IndexesSome indexes may have “Temperature Compensated”indicated on the faceplate. The gearing for these indexes is identical to a standard index. The temperature compen-sation takes place mechanically inside the diaphragmmeter. The index is marked simply to identify the meter astemperature compensated. These indexes are read in thesame manner as outlined previously.

Temperature-Compensated Circle-Type Index

Temperature-Compensated Odometer-Type Index

Direct-Mount Pressure-Compensated Index

Vertical-Mount Pressure-Compensated Index

Q = (V x 3600) / Twhere:

V = Volume Per Revolution (acf) Q = (V x 3600) / TT = Time (sec.) Q = (1/2 x 3600) / 18Q = Flow Rate (acfh) Q = 100 acfh

Pressure-Compensated IndexesIndexes with red faceplates have different gearing toaccount for measuring at a constant elevated pressure(see pages 6-8 for more on pressure-compensating indexes).These indexes are read in the same manner as outlinedpreviously.

Direct-Mounted Indexes standard and TC(Used on diaphragm meters up through AC-630)

English/Imperial

4

28538G100 1 ft3 Circle 4 100 ft3 1/4 ft3

28538G102 1 ft3 Circle 4 100 ft3 1/4 ft3 TC

54887G005 1 ft3 Odometer 4 100 ft3 1/4 ft3

54887G006 1 ft3 Odometer 4 100 ft3 1/4 ft3 TC


04972G038 2 ft3 Circle 4 100 ft3 –

04972G072 2 ft3 Circle 4 100 ft3 1/2 ft3

04972G087 2 ft3 Circle 4 100 ft3 1/2 ft3 Class 175-250 Only

04972G039 2 ft3 Circle 4 100 ft3 1/2 ft3 TC

04972G126 2 ft3 Circle 4 100 ft3 1/2 ft3 TC, "AC-630" Only

04972G125 2 ft3 Circle 4 100 ft3 1/2 ft3 "AC-630" Only







54885G012 2 ft3 Odometer 4 100 ft3 1/2 ft3 "AC-630" Only

54885G013 2 ft3 Odometer 4 100 ft3 1/2 ft3 TC, "AC-630" Only

54885G014 2 ft3 Odometer 4 100 ft3 1/2 ft3 Curb Meters Only

54885G015 2 ft3 Odometer 4 100 ft3 1/2 ft3 Curb Meters Only, with Hash Marks

FirstNumber of Reading

Index Reading Digit SpeedPart Number Drive Index Type Digits Multiplier Circle Additional Description

Metric

52142G014 0.05 m3 Odometer 4 0.1 m3 0.001 m3

52142G010 0.05 m3 Odometer 5 0.1 m3 0.001 m3

52142G030 0.05 m3 Odometer 4 0.1 m3 – TC

52142G013 0.05 m3 Odometer 6 0.1 m3 –

52142G011 0.05 m3 Odometer 5 0.1 m3 – TC



AC-250 AL-425 AC-630AM-250AT-210/AT-250

Vertical-Mounted Indexes standard and TC(Used on diaphragm meters AL-800 and larger, as well as turbine meters)

5

English/Imperial



Metric

54882G001 0.1 m3 Circle 5 10 –

52170G002 0.1 m3 Odometer 5 10 –

54883G001 1.0 m3 Circle 6 10 –

52171G002 1.0 m3 Odometer 6 10 –

54884G001 10 m3 Circle 6 10 –

52178G002 10 m3 Odometer 6 10 –



52934K001 5 ft3 Circle 5 100 ft3 –

52934K002 5 ft3 Circle 5 100 ft3 – TC

54557G001 5 ft3 Circle 4 100 ft3 – TC

52319G001 5 ft3 Odometer 5 100 ft3 –

52319G002 5 ft3 Odometer 5 100 ft3 – TC

52274G001 5 ft3 Odometer 6 100 ft3 –


52935K001 10 ft3 Circle 5 100 ft3 –

52935K002 10 ft3 Circle 5 100 ft3 – TC

52210G002 10 ft3 Odometer 5 100 ft3 –


52320G001 10 ft3 Odometer 6 100 ft3 –


52970K001 100 ft3 Circle 6 1,000 ft3 –

52211G002 100 ft3 Odometer 6 1,000 ft3 –

52211G011 100 ft3 Odometer 6 1,000 ft3 – TC

52971K001 1,000 ft3 Circle 6 10,000 ft3 –

10177G001 1,000 ft3 Circle 6 10,000 ft3 –

52212G002 1,000 ft3 Odometer 6 10,000 ft3 –

Pressure-Compensating Indexes

Pressure-Compensated Indexes (PC Indexes) allow for a pressure-compensated reading of the accumulated gas volume passing through a meter that is under elevatedpressure. This compensation is done through the use ofgearing, which increments the usage reading by the magni-tude of the pressure factor. The index chosen for a specificmeter and application is based upon the drive of the meter,metering gage pressure, average atmospheric pressure,and base pressure.PC Indexes have an inherent error associated with themthat cannot be avoided. ANSI specifications have allowedthe amount of this error to be ±0.75% for pressure-compensated indexes. This error is due to the fact that the PC Indexes take advantage of gears with differentnumbers of teeth, and, therefore, different gear ratios, to make the appropriate corrections.It’s important to note that index speed dials are not corrected for pressure. Using an index having a one-footdrive for example, the one-foot hand will turn and not becorrected for an elevated pressure passing through themeter. If timing the meter to calculate flow rate, the pressurefactor will need to be applied to the flow rate to compen-sate for the elevated pressure. This is also of significancewhen using automated meter reading (AMR) devices orpulse collectors that depend on the revolutions of thespeed hand to generate the pulse.In order to account for measurement error caused by thePC Index, the upstream regulator can be adjusted to aslightly different set pressure. This creates the appropriatepressure factor matching the correction made by the PCIndex. This is an acceptable practice resulting in the propermeasurement and recording of the volumes of gas passedthrough a meter that is under elevated pressure.

Chart column descriptionsPart Number – American Meter part number for the index.Number of Reading Digits – Number of digits that areused for accumulated volume recording (e.g. 5 circle indexwill give readings in five digits, the smallest is 1000, thelargest is 10 million)First Reading Digit Multiplier – This indicates the multiplierto be used for the first, right-most dial (or digit for odometerindexes). Reference page 2-3 How to read your gas meterfor full description.Speed Circle – The volume of the second (if applicable)speed hand other than the direct drive hand. Speed circlesare only on direct reading indexes used on small to mediumsize meters (up to AC-630).Gage Pressure – The gas pressure that is placed on themeter (also called Metering Pressure).Atmospheric Pressure – The average atmospheric pressureused by the utility for that specific meter location. ANSIdesignates a standard of 14.4 psia for average atmosphericpressure but others are available (e.g. 14.73).Base Pressure – The pressure to which the gas volumesare corrected. ANSI designates a standard of 14.73 psiafor base pressure but others are available (e.g. 14.65).

6

Theoretical Pressure Factor (P.F.) – The pressure factor calculated using Boyle’s Law for the given conditions (meter-ing pressure, atmospheric pressure, and base pressure).

Boyles’ Law =

where,FP = Pressure FactorPM = Metering PressurePAtm = Atmospheric PressurePB = Base Pressure

1/P.F. – This column indicates the result of one divided by theTheoretical P.F., which is used by some AMR devices.Gearing Ratio Desired – Found by dividing the smallestbilling circle volume on the index (right-most circle) by thesum of the meter drive (1, 2, 5, 10 or 100-foot drive) and thetheoretical pressure factor.Gearing Ratio Actual – Found using normal gear ratio calculations.Percent Error Reg. – Percent Error Registered, calculated by subtracting the Desired Gear Ratio from the Actual GearRatio and dividing the result by the Desired Gear Ratio. Thetotal result is multiplied by 100 to arrive at a percentage. Anegative sign indicates that the volumes are short by thatpercentage, or that the meter is not recording enough gas on the index. A positive number would indicate the meter is reading additional volume than it should.Actual Index P.F. – The pressure factor to which the index iscorrecting the gas usage volume. This is found by multiplyingthe theoretical pressure factor by the sum of 1 plus the error.This is also the factor that should be programmed into allAMR devices and pulsing devices to insure index read volumes match billing volumes.NOTE: An AMR device records off the direct hand that is not pressure compensated. If the AMR device is programmed for the theoretical pressurefactor, the index will record different volumes than the AMR device. If thetheoretical pressure factor is programmed into the AMR device, and the regulator is not adjusted to the recommended Adjusted Regulator SetPressure, the errors can be compounded which make the measurementerror worse.

Adjusted Regulator Set Press. – Recommended regulatorset pressure account for the index error. Calculated bymanipulating Boyle’s Law algebraically to solve for thedesired meter pressure as follows:

where,

FP x PB = PM x PAtm

(FP x PB) – PAtm = PM

FP = Pressure FactorPM = Metering PressurePAtm = Atmospheric PressurePB = Base Pressure

PM + PAtm

PBFP =

PM + PAtm

PBFP =

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9

Index Box Assembly for Direct-Mounted Indexes

39865W052 Index Box (Vented) with Dex Seal, Standard

1 1 39865W053 Index Box (Vented) with Dex Seal, UV Coated

39865G086 Index Box (Vented) with Dex Seal, Curb Meters Only

2 4 10347P174 Combo Head Screw, Use with Security Seals

10347P143 Combo Head Screw, Use with Seal Wires

3 2 52548P010 Security Seal Cap (Red)

ItemNumber Quantity Part Number Description

10

Index Box Assembly for Vertical-Mounted Indexes

1A 21359P014 Index Box, Lexan, Clear

1B 21359G002 Index Box, Lexan, UV Coated

1C 1 10351G015 Index Box, Lexan, 2-Piece

1D 22015G005 Index Box, Steel, Glass Window

1E 22015G008 Index Box, Steel, Lexan (Glazed) Window

2A 48828P034 Base Plate, Four (4) Security Seal Towers AL-800 thru AL-5000 & 4" thru 12" GT Meters

2B 48828P038 Base Plate, No Security Seal Towers AL-800 thru AL-5000 & 4" thru 12" GT Meters

2C1

48828P040 Base Plate, Four (4) Security Seal Towers 3" GT, 4" thru 12" GTS & AccuTest Meters

2D 48828P042 Base Plate, No Security Seal Towers 3" GT, 4" thru 12" GTS & AccuTest Meters

3A 10347P060 Fillister Head Screw Use w/ Base Plates having Security Seal Towers

3B4

10347P061 Fillister Head Screw Drilled Head for Seal Wire

4A 13519P271 Round Head Screw Use w/ Metal Indexes

4B 2 55060P029 Pan Head Screw (Self-Tapping) Use w/ Plastic Indexes

4C 19316P035 Fillister Head Screw Use / Metal Indexes. Drilled Head for Seal Wire

5 2 19316P004 Fillister Head Screw

6 1 42556P004 Gasket, Index Box

7 2 55542P018 Receptacle, Security Seal Cap

8 2 42253P086 Collar, Security Seal Cap

9A As 52548P010 Security Seal Cap

9B Required 52548K002 Security Seal Cap Bagged - (60) Pieces/bag

10 1 41477P020 Gasket, Base Plate

ItemNumber Quantity Part Number Description Notes

Index Box Kits for Vertical-Mounted Indexes

21359K001 1A, 4A, 4B, 7, 8, 9A

21359K002 1A, 4A, 4B, 7, 8

21359K003 1B, 4A, 7, 8, 9A

21359K005 1A, 2A, 3A, 4A, 4B, 5, 6, 7, 8, 9A

21359K008 1B, 4A, 7, 8

Part Number Contents – reference item numbers above

248

5' DRIVE

78

4 6

AL800-AL1000-AL1400

EV

5

ERREP000,

0

1

EF.

0

00, T ONLY

9

6

0

R

87

EP

,

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4 62

123

0

345

.VER

78

9

5

IF

P E R R E V .

23

1

10

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78

90000,00

26 45

E

P E R R E V . 34 5 6

.VERREP

987 3

210000,01

1 90000,1

6

1

DETAIL 'C' (TYP)

5

9

DETAIL 'B' (TYP)DETAIL 'A' (TYP)

9

3

9

8

4

7

2

10B

A0L2 3 0

AAL

W

UR0 0N T

F L

5 0 0 0

0 AL 1 0A

8

L

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T

OO

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OWO

L

OCKWEL

SEE DETAIL 'B'

SEE DETAIL 'A'

SEE DETAIL 'C'

11

Index, Index-Box and Base-Plate Kits

21359K025 52934G001 5'5C

21359K026 52934G002 5'5C, TC

21359K013 52934G004 5'5C, PC (2+14.4)/14.73

21359K014 52934G005 5'5C, PC (5+14.4)/14.73

21359K027 52934G006 5'5C, PC(2+14.73)/14.73

21359K015 52934G007 5'5C, PC(10+14.4)/14.73

21359K028 52934G008 5'5C, PC(5+14.73)/14.73

21359K029 52934G010 5'5C, PC(10+14.4)/14.65

21359K030 52934G011 5'5C, PC (5+14.4)/14.65

21359K031 52934G012 5'5C, PC (2+14.4)/14.65

21359K032 52934G013 5'5C, PC (2+14.4)/14.73

21359K010 52935G001 10'5C

21359K017 52935G002 10'5C, TC

21359K009 52935G003 10'5C, SPC'L WRIGGLER

21359K012 52935G004 10'5C, PC(5+14.4)/14.73

21359K011 52935G005 10'5C, PC(2+14.4)/14.73

21359K018 52935G006 10'5C,PC(10+14.4)/14.73

21359K019 52935G007 10'5C,PC(5+14.73)/14.73

21359K020 52935G009 10'5C, PC(5+14.4)/14.65

21359K021 52935G010 10'5C, PC(10+14.4)/14.6

21359K022 52935G011 10'5C, PC(2+14.4)/14.65

21359K023 52935G012 10'5C, PC(2+14.4)/14.65

21359K024 52935G014 10'5C, PC(5+14.4)/14.65

21359K034 52970G001 100'6C

21359K035 52970G002 100'5C

21359K006 52970G002 100'5C UV Coated Index Box

21359K016 52180G052 100'6C,PC(5+14.4)/14.73

21359K036 52180G053 100'6C,PC(10+14.4)/14.73

All kits listed above have standard circle-type indexes. Kits with other vertical indexes, including odometer-type, are available upon request.

Kit Part Number Index Part Number Index Description Other

American Meter Company has a program of continuous product development and improvement; and, therefore, the information in this bulletin is subject to change or modification without notice.

AMERICAN METER132 Welsh RoadSuite 140Horsham, PA 19044Phone: 215-830-1800Fax: 215-830-1890www.americanmeter.com

CANADIAN METER275 Industrial RoadCambridge, OntarioCanada N3H 4R7Phone: 519/650-1900Fax: 519/650-1917www.canadianmeter.com

Turbine Gas MetersHigh performance meters provideaccurate measurement of high-volume gas flow. Turbines areavailable from 3" to 12" line sizesand line pressures up to 1440 psig.See bulletin SB 4510 for moreinformation.

FiltersFiltration down to 10 microns.Protects meter and regulator stations from dirt and pipe scaledamage. See bulletin SB 12521for more information.

Diaphragm MetersAmerican Meter’s compact, light-weight, aluminum-case meters are designed to provide positivedisplacement accuracy for industrialor commercial loads. See bulletinSB 3510 for more information.

Rotary Meter WithContinuous MechanicalTemperature CompensatorThe new CMTC RPM® Series gasmeter provides flowing-gas volumeregistration continuously andmechanically corrected to thestandard base temperature(60°F). See bulletin SB 5520 formore information.

A Complete Family of Gas Measurement, Pressure Regulation, and Filtering Systems

Represented by:

Printed in U.S.A. Core – 5000 – 8/06

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