Specifications Relating to Non-automatic Weighing Devices (1998) (SI/98-81)

Interpretation

• 1 (1) The definitions in this section apply in these Specifications.

  actual scale interval

  actual scale interval or d means the value, expressed in units of mass

  • (a) with respect to analogue indications, of the difference between the values corresponding to two consecutive scale marks; and

  • (b) with respect to digital indications, the difference between two consecutively indicated values. (échelon réeloud )

  automatic indicating device

  automatic indicating device means a weighing device in which the position of equilibrium is obtained without an operator’s intervention. (appareil de pesage à équilibre automatique)

  auxiliary indicating element

  auxiliary indicating element means a rider, a vernier or, in the case of a digital indicating device, the last figure after the decimal sign that is clearly differentiated from other figures such as by size, shape or colour. (dispositif indicateur auxiliaire)

  initial zero-setting mechanism

  initial zero-setting mechanism means a feature that automatically sets a weighing device to zero at the time the device is switched on and before it is ready for use. (dispositif de mise à zéro initiale)

  maximum capacity

  maximum capacity or Max means the maximum weighing capacity of a weighing device and, in the case of a multiple range device, the maximum weighing capacity of the relevant range. (portée maximaleouMax )

  metrological function

  metrological function means a function of a weighing device that is necessary for the measurement process — including the sensing of the measured quantity, the transmission, processing, storage and correction or adjustment of measurement signals or values and the indication or printing of measurement values — and that can impact on the final quantity determination or price calculation or affect the validity of transactions. Metrological functions include, but are not limited to,

  • (a) displaying or printing gross, tare, net and negative weight values, zero, and unit and total prices;

  • (b) setting zero, linearity, sensitivity, scale intervals, maximum capacity and motion detection; and

  • (c) performing the computation and rounding of price and weight values and the storing of values. (fonction métrologique)

  module

  module means a part of a weighing device that

  • (a) performs a specific metrological function;

  • (b) can be examined and tested separately; and

  • (c) is subject to the error limits set out in these Specifications. (module)

  multi-interval device

  multi-interval device means a weighing device

  • (a) that has a single weighing range divided into partial weighing ranges, each of which has a different scale interval; and

  • (b) in which the appropriate partial weighing range is automatically determined according to the load applied, both for increasing and decreasing loads. (appareil à échelons multiples)

  multiple range device

  multiple range device means a weighing device that

  • (a) has, for the same weighing and load-receiving element, two or more weighing ranges, each of which

    • (i) extends from zero to the maximum capacity of the range, and

    • (ii) has a different verification scale interval; and

  • (b) selects automatically, or permits the operator to select manually, any of the weighing ranges. (appareil à étendues multiples)

  non-automatic indicating device

  non-automatic indicating device means a weighing device that requires an operator’s intervention to obtain equilibrium, such as an equal-arm scale with weights. (appareil de pesage à équilibre non automatique)

  non-automatic weighing device

  non-automatic weighing device or weighing device means a weighing machine that weighs discrete loads and that requires an operator’s intervention during the weighing process, such as to deposit the load to be measured on the weighing and load-receiving element and to remove it therefrom or to obtain weight results. (appareil de pesage à fonctionnement non automatiqueouappareil de pesage )

  number of verification scale intervals

  number of verification scale intervals means the value obtained by using the following formula:

  Max/e

  where

  Max

  represents the maximum capacity, and

  e

  represents the verification scale interval. (nombre d’échelons de vérification)

  on-board weighing system

  on-board weighing system means a weighing device designed to be an integral part of, or attached or secured to, the frame, chassis, lifting mechanism or bed of mobile equipment such as a truck, tractor, trailer or forklift. (système de pesage monté sur véhicule)

  verification scale interval

  verification scale interval or e means a value, specified by the manufacturer and expressed in units of mass, that is used for the classification and inspection of a weighing device. (échelon de vérificationoue )

  weight classifier

  weight classifier means a weighing device with a digital indicating element that rounds a weight value up to the next verification scale interval. (appareil classificateur)

• (2) In these Specifications, a reference to a verification scale interval or actual scale interval refers to that of the weighing range or partial weighing range, as the case may be, that is being tested.

Application

• 2 (1) Subject to subsection (2), these Specifications apply to any non-automatic weighing device and to any equipment or accessory that is attached to the device or used in conjunction with it.

• (2) A non-automatic weighing device that, before June 15, 1998, was approved under subsection 3(1) of the Weights and Measures Act or inspected under the terms of a previous enactment — or whose class, type or design was so approved —

  • (a) is subject to the performance requirements set out in these Specifications; and

  • (b) is not subject to any of the provisions of these Specifications relating to design, composition, construction or marking where the non-automatic weighing device meets the requirements that applied when its class, type or design was approved or, failing which, that applied to the device on its approval or inspection.

Classification of Non-automatic Weighing Devices

• 3 (1) Subject to subsections (2) and (3), the classes of non-automatic weighing devices are as set out in column 1 of the table to this subsection on the basis of the device’s accuracy, verification scale interval and number of verification scale intervals as set out in columns 2, 3 and 4, respectively, of that table.

  Column 1	Column 2	Column 3		Column 4
  		Verification scale interval (e)		Number of verification scale intervals
  Class	Accuracy	International Units	Canadian Units	Minimum	Maximum
  	Special	e	e	50 000	– – –
  	High	0.001 g (0.005 carat)	0.00005 ounce (troy ounce)	100	100 000
  		≤ e ≤	≤ e ≤
  		0.05 g (0.2 carat)	0.002 ounce (troy ounce)
  		e ≥ 0.1 g (0.5 carat)	e ≥ 0.005 ounce (troy ounce)	5 000	100 000
  	Medium	0.1 g ≤ e ≤ 2 g	0.0002 pound (0.005 ounce)	100	10 000
  			≤ e ≤
  			0.005 pound (0.1 ounce)
  		e ≥ 5 g	e ≥ 0.01 pound (0.2 ounce)	500	10 000
  	Medium (high capacity devices)	e ≥ 2 kg	e ≥ 5 pounds	2 000	– – –
  	Ordinary	e ≥ 5 g	e ≥ 0.01 pound (0.2 ounce)	100	1 200

• (2) On-board weighing systems are limited to Classes , and .

• (3) The verification scale interval of Class on-board weighing systems shall not be less than 5 g.

4 Where a weighing device is marked or operates in legal units of measurement other than those referred to in these Specifications, such as in degrees Fahrenheit or carats, the equivalent values in those other units of measurement shall be used for the purpose of applying these Specifications.

Verification Scale Interval

5 The verification scale interval for Class and weighing devices that are not equipped with auxiliary indicating elements, for Class , and weighing devices, for multiple range devices and for multi-interval devices is equal to the actual scale interval.

6 For multi-interval devices, the verification scale interval of a particular partial weighing range must be smaller than the verification scale interval of the immediately superior partial weighing range, and each range must comply with the requirements set out in section 3 for the class into which the device falls.

7 The verification scale interval for Class  and weighing devices that are equipped with auxiliary indicating elements corresponds to the value of the scale interval preceding the actual scale interval of the auxiliary indicating element, and is larger than the actual scale interval.

Performance - General

In-service Limits of Error

• 8 (1) The in-service limits of error set out in column I of the table to this section apply, in respect of each class of non-automatic weighing devices set out in column II of that table, according to the specified load.

• (2) In the table to this section, m means the weight of the load placed on the weighing device, and is expressed in the number of verification scale intervals.

• (3) The in-service limits of error that apply to a Class weighing device are ±1 e where the load is not less than zero and not more than 500 verification scale intervals, and where the load exceeds 500 verification scale intervals, calculated by adding ±1 e for each additional 800 verification scale intervals or less, to a maximum of ±22 e.

  Column I	Column II
  Limits of error	Class	Class	Class	Class
  ± 1 e	0 ≤m≤ 50 000	0 ≤m≤ 5 000	0 ≤m≤ 500	0 ≤m≤ 50
  ± 2 e	50 000 <m≤ 200 000	5 000 <m≤ 20 000	500 <m≤ 2 000	50 <m≤ 200
  ± 3 e	m> 200 000	20 000 <m≤ 100 000	2 000 <m≤ 4 000	200 <m≤ 400
  ± 5 e	– – –	– – –	4 000 <m≤ 10 000	400 <m≤ 1 200