Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices Episode 8 doc

In either case, a volume chart shall be provided for each such rod or gauge and each tank with which it is associated, showing values in terms of the graduation on the rod or gauge.. If

4.42 Farm Milk Tanks Handbook 44 - 2007

S.3 Design of Indicating Means

S.3.1 General - A tank shall include indicating means and shall be calibrated over the entire range of the volume of

the tank from 5 % of capacity or 2 m 3 (500 gal) whichever is less, to its maximum capacity

[Nonretroactive as of January 1, 1986]

(Added 1985)

S.3.2 Gauge-Rod Bracket or Supports - If a tank is designed for use with a gauge rod, a substantial and rigid

gauge-rod bracket or other suitable supporting elements for positioning the gauge rod shall be provided A gauge rod and its brackets or other supporting elements shall be so constructed that, whenever the rod is placed in engagement with the bracket or supports and released, the rod will automatically seat itself at a fixed height and in a vertical position When a gauge rod is properly seated on its brackets or supports, there shall be a clearance of at least 7.5 cm (3 in) between the graduated face of the rod and any tank wall or other surface that it faces

S.3.3 Gauge Rod - When properly seated in position, a rod shall not touch the bottom of the tank unless this is

required by the design of the supporting elements The rod shall be graduated throughout an interval corresponding

to the volume range within which readings of liquid level are to be made

S.3.4 Surface-Gauge Bracket or Supports - If a tank is designed for use with a surface gauge, a substantial and

rigid surface-gauge bracket or other suitable supporting elements for positioning the surface gauge shall be provided

A surface gauge and its brackets or other supporting elements shall be so constructed that, whenever the gauge assembly is placed in engagement with the bracket or supports, the indicator, if not permanently mounted on the tank, will automatically seat itself in correct operating position, and the graduated element will be vertically positioned and will be securely held at any height to which it may be manually set

S.3.5 Surface Gauge - When properly engaged with its bracket and set to its lowest position, a surface gauge shall

not touch the bottom of the tank The gauge shall be graduated throughout an interval corresponding to the volume range within which readings of liquid level are to be made

S.3.6 External Gauge Assemblies

S.3.6.1 Design and Installation - The gauge assembly shall be designed to meet sanitary requirements and

shall be readily accessible for cleaning purposes The gauge assembly shall be mounted in a vertical position and equipped with a sliding mechanism to assist in determining the liquid level

S.3.6.2 Gauge Tube - The gauge tube shall be borosilicate glass or approved rigid plastic or rigidly supported

flexible tubing with a uniform internal diameter not less than 2 cm (¾ in) It shall be designed and constructed

so that all product in the gauge can be discarded in such a manner that no product in the gauge tube will enter the discharge line or tank

(Amended 1983)

S.3.6.3 Scale Plate - The scale plate shall be mounted adjacent to and parallel with the gauge tube and be no

more than 7 mm (¼ in) from the tube

S.3.6.4 Scale Graduations - The graduation lines shall be clear and easily readable and shall comply with the

requirements of paragraphs included under S.3.7 Graduations

S.3.6.5 Venting - An external gauge tube shall be adequately vented at the top, open to the atmosphere Any

attachment to the gauge tube shall not adversely affect the operation of this vent

(Added 1984)

(Added 1977)

S.3.7 Graduations

S.3.7.1 Spacing and Width of Graduations - On a gauge rod or surface gauge, the spacing of the graduations,

center to center, shall be not more than 1.6 mm (0.0625 in or 1

/16 in) and shall not be less than 0.8 mm

Handbook 44 - 2007 4.42 Farm Milk Tanks

(0.03125 in or 1

/32 in) The graduations shall not be less than 0.12 mm (0.005 in) in width, and the clear interval between adjacent edges of successive graduations shall be not less than 0.4 mm (0.015625 in or 1

/64 in)

S.3.7.2 Values of Graduations - On a gauge rod or surface gauge, the graduations may be designated in

inches or in centimeters and fractions thereof, or may be identified in a numerical series without reference to inches or centimeters or fractions thereof In either case, a volume chart shall be provided for each such rod or gauge and each tank with which it is associated, showing values in terms of the graduation on the rod or gauge

If a rod or gauge is associated with but one tank, in lieu of linear or numerical series graduations and volume chart, values in terms of volume of liquid in the tank may be shown directly on the rod or gauge

S.3.7.3 Value of Graduated Interval - The value of a graduated interval on a gauge rod or surface gauge

(exclusive on the interval from the bottom of the tank to the lowest graduation) shall not exceed:

(a) 2 L for a tank of a nominal capacity of 1000 L or less; ½ gal for a tank of a nominal capacity of 250 gal

(e) 8 L plus 4 L for each additional 10 000 L or fraction thereof, for tanks of nominal capacity above

10 000 L or 2 gal plus 1 gal for each additional 2500 gal or fraction thereof, for tanks with nominal capacity above 2500 gal

(Amended 1980)

S.3.8 Design of Indicating Means on Tanks with a Capacity Greater than 8000 Liters or 2000 gallon - Any farm

milk tank with a capacity greater than 8000 L, or 2000 gal, shall be equipped with an external gauge assembly [Nonretroactive and applicable only to tanks manufactured after January 1, 1981]

(Added 1980)

S.4 Design of Volume Chart

S.4.1 General - A volume chart shall show volume values only, over the entire range of the volume of the tank

from 5 % of capacity or 2 m 3 (500 gal) whichever is less, to its maximum capacity.* All letters and figures on the

chart shall be distinct and easily readable The chart shall be substantially constructed, and the face of the chart shall

be so protected that its lettering and figures will not tend easily to become obliterated or illegible

[*Nonretroactive as of January 1, 1986]

(Amended 1985)

S.4.2 For a Tank of 1000 Liters, or 250 Gallons, or Less - The volume chart for a tank of nominal capacity of

1000 L, or 250 gal, or less shall show values at least to the nearest 1 L, or ¼ gal

S.4.3 For a Tank of 1001 Liters to 2000 Liters, or 251 to 500 Gallons - The volume chart for a tank of nominal

capacity of 1001 L to 2000 L, or 251 gal to 500 gal, inclusive, shall show values at least to the nearest 2 L, or ½ gal

S.4.4 For a Tank of Greater than 2000 Liters, or 500 Gallons - The volume chart for a tank of nominal capacity

of greater than 2000 L, or 500 gal, shall show values at least to the nearest gallon, or 4 L

(Amended 1980)

S.5 Gauging

S.5.1 Level - A farm milk tank shall be level, as shown by the level-indicating means, during the original gauging

operation

4.42 Farm Milk Tanks Handbook 44 - 2007

S.5.2 To Deliver - A farm milk tank shall be originally gauged "to deliver." If the tank is gauged by measuring the

test liquid into the tank, the inside tank walls shall first be thoroughly wetted and the tank shall then be drained for

30 seconds after the main drainage flow has ceased

S.5.3 Preparation of Volume Chart - When a tank is gauged for the purposes of preparing a volume chart,

tolerances are not applicable, and the chart shall be prepared as accurately as practicable

S.6 Identification - A tank and any gauge rod, surface gauge, spirit level, and volume chart intended to be used

therewith shall be mutually identified, as by a common serial number, in a prominent and permanent manner

N Notes

N.1 Test Liquid - Water shall be used as the test liquid for a farm milk tank

N.2 Evaporation and Volume Change - Care shall be exercised to reduce to a minimum, evaporation losses and

volume changes resulting from changes in temperature of the test liquid

N.3 To Deliver - A farm milk tank shall be tested "to deliver." If the tank is gauged by measuring the test liquid

delivered into the tank, the inside tank walls shall first be thoroughly wetted and the tank then shall be drained for

30 seconds after the main drainage flow has ceased

N.4 Level - A farm milk tank shall be level, as shown by the level-indicating means, during gauging and testing N.5 Test Methods - Acceptance tests of milk tanks may be of either the prover method or the master meter method

provided that the master metering system is capable of operating within 25 % of the applicable tolerance found in T.3 Subsequent tests may be of either the prover method or the master meter method provided that the master metering system is capable of operating within 25 % of the applicable tolerance found in T.4

N.5.1 Verification of Master Metering Systems - A master metering system used to gauge a milk tank shall be

verified before and after the gauging process A master metering system used to calibrate a milk tank, shall be verified before starting the calibration and reverified at least every quarter of the tank capacity, or every 2000 L (500 gal), whichever is greater

(Added 2001)

N.5.2 Temperature Changes in Water Supply - When using a master metering system to gauge or calibrate a

milk tank, the official shall monitor the temperature of the water before and after changing sources of supply If the water temperature of the new source changes by more than 2.8 °C (5 °F) from the previous supply, the official shall reverify the accuracy of the master metering system as soon as possible after the system reaches temperature equilibrium with the new supply source

(Added 2001)

N.6 Reading the Meniscus - When a reading or setting is to be obtained from a meniscus formed by milk or other

opaque liquid, the index or reading line is the position of the highest point of the center of the meniscus When calibrating a device with water and the device is to be used with an opaque liquid, the reading should be obtained accordingly; that is, the position of the highest point of the center of the meniscus

(Added 1984)

T Tolerances

T.1 Application - The tolerances hereinafter prescribed shall be applied equally to errors in excess and errors in

deficiency

T.2 Minimum Tolerance Values - On a particular tank, the maintenance and acceptance tolerance applied shall be not

smaller than the volume corresponding to the graduated interval at the point of test draft on the indicating means or 2 L (½ gal), whichever is greater

(Amended 1980)

Handbook 44 - 2007 4.42 Farm Milk Tanks

T.3 Basic Tolerance Values - The basic maintenance and acceptance tolerance shall be 0.2 % of the volume of test

liquid in the tank at each test draft

(Amended 1975)

T.4 Basic Tolerance Values, Master Meter Method - The basic maintenance and acceptance tolerance for tanks tested

by the master meter method shall be 0.4 % of the volume of test liquid in the tank at each test draft

(Added 1975)

UR User Requirements

UR.1 Installation - A stationary tank shall be rigidly installed in level without the use of removable blocks or shims

under the legs If such tank is not mounted permanently in position, the correct position on the floor for each leg shall be clearly and permanently defined

UR.2 Level Condition

UR.2.1 Stationary Tank - A stationary farm milk tank shall be maintained in level

UR.2.1.1 Leveling Lugs - If leveling lugs are provided on a stationary tank, such lugs shall not be hammered

or filed to establish or change a level condition of the tank

UR.2.2 Portable Tank - On a portable tank, measurement readings shall be made only when the tank is

approximately level; that is, when it is not out of level by more than 5 % or approximately three degrees in any direction

UR.3 Weight Chart - An auxiliary weight chart may be provided, on which shall be prominently displayed the weight

per unit volume value used to derive the weight values from the official volume chart

UR.4 Use - A farm milk tank shall not be used to measure quantities greater than an amount that can be agitated without

overflowing

4.42 Farm Milk Tanks Handbook 44 - 2007

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Handbook 44 - 2007 4.43 Measure-Containers

Section 4.43 Measure-Containers

A Application

A.1 - This code applies to measure-containers, including lids or closures if such are necessary to provide total enclosure

of the measured commodity, as follows:

(a) Retail measure-containers intended to be used only once to determine at the time of retail sale, and from bulk supply, the quantity of commodity on the basis of liquid measure The retail measure-container serves as the container for the delivery of the commodity

(b) Prepackaged measure-containers intended to be used only once to determine in advance of sale the quantity of a commodity (such as ice cream, ice milk, or sherbet) on the basis of liquid measure The prepackaged measure-container serves as the container for the delivery of the commodity, in either a wholesale or a retail marketing unit

A.2 - This code does not apply to rigid containers used for milk, cream, or other fluid dairy products, which are covered

by packaging requirements

A.3 - See also Sec 1.10; General Code requirements

S Specifications

S.1 Units - The capacity of a measure-container shall be a multiple of or a binary submultiple of a quart or a liter, and

the measure shall not be subdivided However, for prepackaged measure-containers, any capacity less than ¼ L or

½ liquid pint shall be permitted

(Amended 1979)

S.2 Capacity Point - The capacity of a measure-container shall be sharply defined by:

(a) the top edge,

(b) a line near the top edge, or

(c) the horizontal cross-sectional plane established by the bottom surface of the removable lid or cap when seated in the container

S.3 Shape - A measure-container shall be designed as some suitable geometrical shape, and its capacity shall be

determined without distortion from its normal assembled shape

S.4 Marking

S.4.1 Capacity Point - If the capacity point of a measure-container is defined by a line, the container shall be

marked conspicuously on its side with a suitable statement clearly identifying this line as the capacity point

S.4.2 Capacity Statement - A measure-container shall be clearly and conspicuously marked with a statement of its

capacity in terms of one of the units prescribed in S.1

N Notes

N.1 Test Liquid - Water shall be used as the test liquid for a measure-container

N.2 Preparation of Container for Test

N.2.1 General - Before an actual test is begun, a measure-container shall, if necessary, be so restrained that it will

maintain its normal assembled shape and that its sides will not bulge when it is filled with water

4.43 Measure-Containers Handbook 44 - 2007

N.2.2 Restraining Form for Test

N.2.2.1 For Rectangular Containers of One Liter, One Quarter Less - Bulging of the sides of a rectangular

measure-container of 1 L (1 qt) capacity or less may be controlled by holding against each side of the container,

with a cord, rubber bands, or tape, a metal plate or a piece of heavy cardboard slightly smaller than the side of

the container

(Amended 1979)

N.2.2.2 For Rectangular Prepackaged Measure-container of Two Quarts or Two Liters or Greater - A

rectangular prepackaged measure-container of 2 L (2 qt) capacity or greater shall be supported during a test by a

rigid restraining form This form shall restrain not less than the entire area of the central two-thirds of each side

of the container, measured from bottom to top The inside width dimension of any side panel of the restraining

form shall be 1.6 mm (1

/16 in) greater than the corresponding outside dimension of the container (The outside width dimension of any side panel of the container shall be established by adding to the inner side center-of-

score to center-of-score dimension two thicknesses of the board used, and the sum thus obtained shall be

rounded off to the nearest 0.4 mm (1

/64 in)

(Amended 1979)

T Tolerances

T.1 Tolerances on an Individual Measure - The acceptance tolerances in excess and in deficiency on an individual

measure shall be as shown in Table 1

T.2 Tolerance on Average Capacity - The average capacity on a random sample of 10 measures selected from a lot of

25 or more shall be equal to or greater than the nominal capacity

(Amended 1979)

UR User Requirements

UR.1 Limitation of Use - The use of a measure-container with a rectangular cross section of a capacity of 2 L (2 qt) or

greater shall be limited to the packaging, in advance of sale, of ice cream, sherbet, or other similar frozen desserts

(Amended 1979)

Table 1

Acceptance Tolerances,

in Excess and in Deficiency, for Measure-Containers

Handbook 44 - 2007 4.44 Graduates

Section 4.44 Graduates

A Application

A.1 - This code applies to subdivided glass measures of capacity, either cylindrical or conical in shape

A.2 - See also Sec 1.10; General Code requirements

S Specifications

S.1 Units - Nominal capacities, graduation ranges, values of graduated intervals, and numbered graduations applicable

to single-scale graduates and to the appropriate portions of double scale graduates shall be as shown in Table 1

Number at Each Graduation Divisible

by milliliters milliliters milliliters milliliters

And, in addition, at the first (15-minim) graduation

b

And, in addition, at the first (30-minim) graduation

S.2 Initial Interval - A graduate shall have an initial interval that is not subdivided, equal to not less than one-fifth and

not more than one-fourth of the capacity of the graduate

S.3 Shape - A graduate of a capacity of more than 15 mL (4 fl dr) may be of either the cylindrical or circular conical

type A graduate of a capacity of 15 mL (4 fl dr) or less shall be of the single-scale cylindrical type

S.4 Material - A graduate shall be made of good-quality, thoroughly annealed, clear, transparent glass, free from

bubbles and streaks that might affect the accuracy of measurement The glass shall be uniform in thickness and shall not

be excessively thick

4.44 Graduates Handbook 44 - 2007

S.5 Dimensional Proportions

S.5.1 On a Circular Conical Graduate - The inside measurement from the bottom of a circular conical graduate

to the capacity graduation shall be not less than two times the inside diameter at the capacity graduation The inside measurement from the bottom of the graduate to the point representing one-fourth of the capacity shall be not less than the inside diameter at that point

S.5.2 On a Cylindrical Graduate - The inside measurement from the bottom of a cylindrical graduate to the

capacity graduation shall be not less than five times the inside diameter at the capacity graduation

S.6 Base - The base of the graduate shall be perpendicular to the vertical axis of the graduate The diameter of the base

shall be of such size that the empty graduate will remain standing on an inclined surface of 25 %, or approximately

15 degrees, from the horizontal

S.7 Design of Graduations

S.7.1 General - Graduations shall be perpendicular to the vertical axis of the graduate and parallel to each other

Graduations shall be continuous, of uniform thickness not greater than 0.4 mm (0.015 in), clearly visible, permanent, and indelible under normal conditions of use

(Amended 1977)

S.7.2 On a Single-Scale Graduate - On a single-scale graduate, the main graduations shall completely encircle the

graduate and subordinate graduations shall extend at least one-half the distance around the graduate

S.7.3 On a Double-Scale or a Duplex Graduate - On a double-scale or duplex graduate, there shall be a clear

space between the ends of the main graduations on the two scales, and this space shall be approximately 90 degrees from the lip of the graduate and shall conform to the requirements of Table 2

Table 2

Clear Space Between Ends of Main Graduations on Double Scale Graduates Inside Diameter of Graduate at the Graduations

S.8 Basis of Graduation - A graduate shall be graduated "to deliver" when the temperature of the graduate is 20 °C

(68 °F), and shall be marked accordingly in a permanent and conspicuous manner

S.9 Marking Requirements - Each main graduation shall be marked to show its value Intermediate graduations shall

not be marked Value figures shall be uniformly positioned either directly upon or immediately above the graduations to which they refer Figures placed upon graduations shall be set in from the ends of the graduations a sufficient distance to allow the ends of the graduations to be used in making a setting

N Notes

N.1 Test Liquid - Water shall be used as the test liquid for graduates

N.2 Temperature Control - During the test of a graduate, appropriate precautions shall be exercised to reduce any

detrimental temperature effects to the practicable minimum

T Tolerances

T.1 - Maintenance and acceptance tolerances in excess and in deficiency shall be as shown in Table 3 for graduates that

are graduated "to contain" or "to deliver." (The tolerance to be applied at any graduation is determined by the inside diameter of the graduate at the graduation in question.)

Handbook 44 - 2007 4.44 Graduates

Table 3

Maintenance and Acceptance Tolerances, in Excess and

in Deficiency, for Graduates Inside Diameter of

Graduate

Inside Diameter of Graduate From to but not

0 9/16

13/16

11/16

15/16

19/16

113/16

21/16

25/16

29/16

213/16

31/16

35/16

39/16

33/16

9/16

13/16

11/16

15/16

19/16

113/16

21/16

25/16

29/16

213/16

31/16

35/16

39/16

313/16

41/16

4.44 Graduates Handbook 44 - 2007

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Handbook 44 - 2007 4.45 Dry Measures

Section 4.45 Dry Measures

A Application

A.1 - This code applies to rigid measures of capacity designed for general and repeated use in the measurement of solids,

including capacities of ½ bushel or more

A.2 - This code does not apply to "standard containers" used for the measurement of fruits and vegetables and as

shipping containers thereof

A.3 - This code does not apply to berry baskets and boxes (see Sec 4.46; Code for Berry Baskets and Boxes)

(Added 1976)

A.4 - See also Sec 1.10; General Code requirements

S Specifications

S.1 Units - The capacity of a measure shall be 1 bushel, a multiple of the bushel, or a binary submultiple of the bushel,

and the measure shall not be subdivided or double-ended

S.2 Material - A dry measure shall be made of any suitable material that will retain its shape during normal usage S.3 Shape - A measure, other than a basket, of a capacity of ½ bushel or less, shall be cylindrical or conical in shape

The top diameter shall in no case be less than the appropriate minimum diameter shown in Table 1 The bottom of a measure, other than a basket, shall be perpendicular to the vertical axis of the measure and shall be flat, except that a metal bottom may be slightly corrugated The bottom of a measure shall not be adjustable or movable

S.3.1 Conical Dry Measure - If conical, the top diameter shall exceed the bottom diameter by not more than 10 %

of the bottom diameter

S.4 Capacity Point - The capacity of a measure shall be determined by the top edge of the measure

S.5 Top Reinforcement - The top edge of a measure shall be reinforced On a wooden measure other than a basket, of

a capacity of 1 quart or more, this reinforcement shall be in the form of a firmly attached metal band

S.6 Marking Requirements - A measure shall be conspicuously marked on its side with a statement of its capacity If

the capacity is stated in terms of the pint or quart, the word "Dry" shall be included The capacity statement shall be in letters of the following dimensions:

(a) At least ½ inch high and ¼ inch wide on a measure of any capacity between ½ pint and 1 peck

(b) At least 1 inch high and ½ inch wide on a measure of a capacity of ½ bushel or more

(c) On a measure of a capacity of ¼ pint or less, the statement shall be as prominent as practicable, considering the size and design of such measure