Paragraph 3 Units of mass

Classification

3.1.

Instruments with one weighing range

Instruments equipped with an auxiliary indicating device shall belong to class I or class II. For these instruments the minimum capacity lower limits for these two classes are obtained from Table 1 by replacement in column 3 of the verification scale interval (e) by the actual scale interval (d).

If d < 10⁻⁴ g, the maximum capacity of class I may be less than 50 000 e.

3.2.

Instruments with multiple weighing ranges

Multiple weighing ranges are permitted, provided they are clearly indicated on the instrument. Each individual weighing range is classified according to 3.1. If the weighing ranges fall into different accuracy classes the instruments shall comply with the severest of the requirements that apply for the accuracy classes in which the weighing ranges fall.

3.3.

Multi-interval instruments

3.3.1.

Instruments with one weighing range may have several partial weighing ranges (multi-interval instruments).

Multi-interval instruments shall not be equipped what an auxiliary indicating device.

3.3.2.

Each partial weighing range i of multi-interval instruments is defined by:

— its verification scale interval e_i	with e*_(i+₁₎ > e_i
— its maximum capacity Max_i	with Max_i = Max
— its minimum capacity Min_i	with Min_i = Max_{( − 1)}
	and Min₁ = Min

where:

i = 1, 2, . . . r,
i = partial weighing range number,
r = the total number of partial weighing ranges.

All capacities are capacities of net load, irrespective of the value of any tare used.

3.3.3.

The partial weighing ranges are classified according to Table 2. All partial weighing ranges shall fall into the same accuracy class, this class being the instrument’s accuracy class.

Table 2

Multi-interval instruments

Class	Verification scale interval (e)	Minimum capacity (Min)	Number of verification scale intervals
		Minimum value	Minimum value^f1	Maximum value
			$n = \frac{{Max}_{i}}{e_{(i + 1)}}$	$n = \frac{{Max}_{i}}{e_{i}}$
(1) For i = r the corresponding column of Table 1 applies, with e replaced by e_r.
I	0,001 g ≤ e_i	100 e_i	50 000	—
II	0,001 g ≤ e_i ≤ 0,05 g	20 e_i	5 000	100 000
	0,1 g ≤ e_i	50 e_i	5 000	100 000
III	0,1 g ≤ e_i	20 e_i	500	10 000
IIII	5 g ≤ e_i	10 e_i	50	1 000

Annotations

Footnotes

f1

(1)

For i = r the corresponding column of Table 1 applies, with e replaced by e_r.

Notes on Schedule 2

Footnotes

f1: See “Nonautomatic weighing instruments Part I: Metrological and technical requirements-Tests” OIML R 76-1 Edition 1992 (E) published by the International Organisation for Legal Metrology.