Commonwealth Numbered Regulations

NATIONAL TRADE MEASUREMENT REGULATIONS 2009 (SLI NO 233 OF 2009) - SCHEDULE 1

(regulation 1.4, definition of maximum permissible error )

Part 1           Interpretation

                In this Schedule:

"verification" includes reverification.

Part 2           Material measures

Division 1       Length

Table 1    Measures of Length

Division 2       Weight

Table 2    Non‑ferrous weights marked 'A'

Table 3    Non‑ferrous weights not marked 'A'

Table 4    Iron Weights

Table 5    Metric carat weights

Division 3       Volume

Table 6    Conical measures

Table 7    Cylindrical line measures

Table 8    Cylindrical brim measures made of glass or metal for alcoholic liquor

Table 9    Cylindrical line measures made of metal for special purposes

Table 10   Portable measures for potable liquids -- line measures

Table 11   Portable measures for potable liquids -- brim measures

Division 4       Dispensing measures including pharmaceutical measures

Table 12   Conical dispensing measures

Table 13   Beaker dispensing measures

Table 14   Lubricating oil measures

Table 15   Graduated measuring cylinders

Part 3           Measuring instruments

Division 1       Length‑measuring instruments

Table 1    Length‑measuring instruments

Division 2       Area‑measuring instruments

Single‑measurement error  -- instruments with analog indication

Table 2    Instruments with analog indication

Single‑measurement error  -- instruments with digital indication

        1       For instruments with digital indication add 0.5 scale interval to the maximum permissible error for an analog instrument.

Mean error

        2       On analog and digital instruments the mean of 20 measurements must not differ from the denominated value of the template by more than half the maximum permissible error mentioned in table 2.

Note    The test templates for measuring instruments with digital indication must have values that are an integral number of square decimetres.

Division 3       Farm milk tanks

                The maximum permissible error for all scale marks on the dipsticks for verification and in-service inspection is ±1 scale interval.

Table 3    Farm milk tanks

Division 4       Vehicle tanks

Tanks used only for sullage

        1       The maximum permissible error for verification or in-service inspection for each scale mark on a sight tube is ±0.5 scale interval.

Vehicle tanks except for sullage

        2       The maximum permissible error applicable to a vehicle tank for verification or in-service inspection is:

                ( a )    for a tank with a capacity mark -- ±0.2% of the indicated volume; and

               ( b )    for a tank with a dipstick -- ±0.5 scale interval for each scale mark on the dipstick.

Division 5       Liquid‑measuring systems

Accuracy classes

        1       Liquid‑measuring systems are classified into 5 accuracy classes as set out in table 4.

Table 4    Liquid‑measuring systems  -- Accuracy classes

Maximum permissible errors

        2       For volumes equal to or greater than 2 L, and subject to clauses 4 and 5, the maximum permissible error on volume indications are set out in table 5.

Table 5    Volumes equal to or greater than 2 L

        3       For volumes less than 2 L, and subject to clauses 4 and 5, the maximum permissible errors, positive or negative, on volume indications are set out in table 6.

Table 6    Volumes less than 2 L

        4       However, whatever the measured quantity may be, the magnitude of the maximum permissible error is the greater of the following 2 values:

                (a)    the absolute value of the maximum permissible error in table 5 or table 6;

    (b)    the minimum specified volume deviation under clause 5.

        5       For minimum measured quantities equal to or greater than 2 L, the minimum specified volume deviation ( E _min ) is calculated using the formula:

where:

"V _min " is the minimum measured quantity.

"A" is the maximum permissible error specified in the column headed 'A' of table 5 for the accuracy class of the measuring system.

        6       For minimum measured quantities less than 2 L, the minimum specified volume deviation is twice the value set out in table 6 and related to the column headed 'A' in table 5 .

Note    The minimum specified volume deviation is an absolute maximum permissible error.

Accuracy of associated measuring instruments

        7       Associated measuring instruments must exhibit an accuracy at least as good as the values set out in tables 7A, 7B and 7C for the accuracy class of the measuring system.

Table 7A  Associated measuring instruments -- temperature

Table 7B  Associated measuring instruments -- pressure

Table 7C  Associated measuring instruments -- Density

Price computing devices

        8       The price indicated must equal the price calculated for the volume and unit price indicated within the following maximum permissible errors as set out in table 8.

Table 8    Price computing devices

Beverage dispensers

Table 9    Beverage dispensers for alcoholic liquor

Division 6       Weighing instruments

Class 1, 2, 3 or 4 non‑automatic instruments

        1       The maximum permissible errors for increasing and decreasing loads, expressed in terms of verification scale interval ( e ), with an instrument adjusted to zero with ± 0.25 e at no load, are set out in table 10.

Table 10   Class 1, 2, 3 or 4 non‑automatic instruments

                where e is the verification scale interval.

        2       For digital indication or printing, a permissible error does not include the positive or negative error arising from rounding up or down to the nearest whole number of scale intervals.

Unclassified even‑arms scales

Table 11   Unclassified even‑arm scales

        3       The maximum permissible error for even‑arm scales must be half the amount specified in table 11 for loads not more than half capacity and the whole amount specified for loads more than half to maximum capacity.

Other unclassified instruments

        4       The maximum permissible errors for self‑indicating weighing instruments and graduated non‑self‑indicating weighing instruments, with an instrument adjusted to zero within ±0.25 scale interval at no load must be:

                (a)    ±0.5 scale interval for the first 500 scale intervals; and

               (b)    ±1 scale interval for more than 500 but not more than 2 000 scale intervals; and

                (c)    ±1.5 scale intervals for more than 2 000 scale intervals.

Belt weighers

Table 12   Belt weighers

Catch weighers

        5       The maximum permissible error for any load equal to or greater than the minimum capacity and equal to or less than the maximum capacity in automatic operation is set out in table 13.

Table 13   Automatic catch weighing instruments

Division 7       Automatic rail‑weighbridges

Accuracy classes

        1       Automatic rail‑weighbridges are divided into the following 4 accuracy classes:

                (a)    0.2;

               (b)    0.5;

                (c)    1;

               (d)    2.

        2       An instrument may be in an accuracy class for wagon weighing that is different from that for train weighing.

Maximum permissible errors  -- weighing in motion

Table 14   Maximum permissible errors for weighing in motion

Wagon weighing

        3       The maximum permissible error for coupled or uncoupled wagon weighing is the greatest of the following values:

                (a)    the value calculated according to table 14, rounded to the nearest scale interval d ;

               (b)    the value calculated according to table 14, rounded to the nearest scale interval for the weight of a single wagon equal to 35% of the maximum wagon weight (as inscribed on the descriptive markings);

                (c)    1  d .

Train weighing

        4       The maximum permissible error for train weighing is the greatest of the following values:

                (a)    the value calculated according to table 14, rounded to the nearest scale interval d ;

               (b)    the value calculated according to table 14 for the weight of a single wagon equal to 35% of the maximum wagon weight (as inscribed on the descriptive markings) multiplied by the number of reference wagons in the train (not exceeding 10 wagons) and rounded to the nearest scale interval;

                (c)    1  d for each wagon in the train, but not exceeding 10  d .

Maximum permissible errors  -- static weighing

        5       The maximum permissible errors on static weighing for increasing or decreasing loads must be the appropriate values set out in table 15.

Table 15   Static weighing

Minimum capacity

        6       The minimum capacity must not be less than 1 t, and not greater than the value of the result of the minimum wagon weight divided by the number of partial weighing.

Minimum wagon weight

        7       The minimum wagon weight must not be less than 50  d .

Division 8       Grain protein measuring instruments

                The maximum permissible errors at verification or in-service inspection are:

                (a)    wheat -- ± 0.4% at 11% moisture; and

               (b)    barley -- ± 0.5% at 0% moisture .

Division 9       Water Vending Machines

Table 16    Water vending machines at all volumes vended

Division 10     Multi-dimensional measuring instruments

        1       The maximum permissible error applicable to the measurement by the instrument of any of the 3 dimensions for verification and in-service inspection is +/- 1 d .

Division 11     Water meters

Table 1    Maximum permissible errors for water meters