Regulation For Conveyor Scales

Original Language Title: Forskrift om krav til transportbåndvekter

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Regulation for conveyor scales

Date FOR-2007-12-21-1736

Ministry of Industry and Ministry of Fisheries

Published in 2008 Booklet 1

Commencement 01/01/2008

FOR 2016-05-03-471




LOV-2007-01-26-4-§7, LAW-2007-01-26-4-§8, LAW-2007-01-26-4-§10, LAW-2007-01-26- 4 §19, LAW-2007-01-26-4-§20, LAW-2007-01-26-4-§30, LAW-2007-01-26-4-§35, TO-2007-12- 20-1723-3-3, FOR-2007-12-20-1723-§3-6, FOR-2007-12-20-1723-5-2

11.01.2008 kl. 15.40

Short Title
Regulations Concerning the conveyor scales

Chapter Overview:

Chapter 1 - Introductory provisions (§§ 1-5)
Chapter 2 - Requirements for conveyor scales (§§ 6-34)
Chapter 3 - Final provisions (§§ 35-36)

Adopted by Metrology 21 December 2007 pursuant to the Act on 26 January 2007 no. 4 to units of measurement, measurement and standard time § 35, ref. § 7 and § 10 and § 8, § 19, § 20 and § 30 and regulation 20 December 2007 no. 1723 on measurement units and measurement § 3-3, § 3-6, § 5-2 second paragraph.
EEA information: EEA Agreement, Annex II, Sec. IX. 27b (Directive 2004/22 / EC).
Sent to notification under the Act of 17 December 2004 no. 101 on European notification of technical rules mm (EEA hearing Act) § 11, ref. § 10; see. The EEA Agreement, Annex II, Chap. XIX. 1 (Directive 98/34 / EC, as amended by Directive 98/48 / EC).
Technical rules upheld, cf. Announcement May 3rd, 2016 No.. 471.
Changes: Amended by regulations 13 Dec 2012 No.. 1243, 16 Dec 2013 No.. 1533, 18 Dec 2015 No.. 1758, 1 February 2016 No.. 89, april 22, 2016 No.. 416, May 3, 2016 No.. 471.

Chapter 1 - Introductory provisions

§ 1. Scope These regulations apply

conveyor scales sold or offered for sale, cf. Regulation of 20 December 2007 no. 1723 on measurement units and measurement § 3-1

conveyor scales when the measurement result is to be used as a basis for calculating a financial settlement, cf. Regulation of 20 December 2007 no. 1723 on measurement units and measurement § 3-4.

Regulation does not conveying weights that are attached to a device, which can be moved and used as a basis for calculating a financial settlement for crushing rock and soil in the mining industry.

§ 2. Definitions In these regulations:


Conveying Weight: An automatic weight that continuously determines the mass of a bulk product on a conveyor belt, without systematic subdivision of the product and without interrupting the conveyor movement


Scales: A measuring instrument that determines the mass of a product without the intervention of an operator and follows a predetermined program of automatic processes characteristic of the measuring instrument


Measurand: The particular quantity subject to measurement


Influence quantity: One size that is not the measurand but that affects the result of measurement


Specified operating conditions: The values ​​of the measurand and influence quantities making up transportbåndvektens normal operating conditions


Disturbance: An influence quantity having a value within the limits specified in the appropriate requirement but outside transportbåndvektens operating conditions. An influence quantity is nevertheless a disturbance if it is not specified in the operating conditions


Critical change value: The value at which the change in the measurement result is considered undesirable


Climatic Environments: The environments in which the belt weigher can be used. It defined a range of temperature limits to account for climate differences between Member States.

§ 3. Requirements for conveyor scales Belt weighers must at least meet the basic requirements set out in Chapter 2. Maximum permissible error on the sale of conveyor scales specified in § 30. Maximum permissible errors using conveyor weights specified in § 31
belt weighers which is approved by the former regulations, shall use fulfill the requirements that existed when the belt weigher was approved, including requirements for measurement accuracy during use.
Belt weighers that are not rightfully conformity mark or has valid type approval and initial approval, are not allowed to use.

§ 4. Inspection and approval on the sale of conveyor scales Belt weighers sold or offered for sale, must have valid conformity assessment under the provisions of regulations on measurement units and measurement Chapter 4.

Belt weighers that are type approved according to the general adjustment provision 03/96, the first approved under this period to the year 2010. Initial approval shall then be carried out under the rules on national conformity assessment regulations on 20 December 2007 no. 1723 to units of measurement and measurement Chapter 4 section 5. This applies only if the type approval for the particular instrument is not more than 10 years when weight must first be approved.

§ 5. Authority with a conveyor of weight used A conveyor weight is subject to a periodic supervision. Supervision period for a conveyor weight capacity even 200 tons per hour is one year. Supervision period for a conveyor weight capacity of 200 tons per hour is three years. Belt weighers used for measurements in connection with the manufacture of ready-packed in fish landing and weighing in fish landing, which receives more than 10 tons of fish per year (per reception), are not subject to supervision period.
Testing of conveyor scales in connection with the checks to be performed in accordance with relevant sections of the applicable OIML R50 and Metrology procedures, unless Metrology deems it more appropriate and judged properly perform testing otherwise.
Conveyor scale should normally be tested with the products it usually is used to weigh and under normal operating conditions. User must ensure that metrology during testing have available sufficient amount of test products, equipment and qualified personnel.
A control instrument shall be available near the belt weigher to be tested. Storage and transportation in connection with the testing shall be arranged so that none of the test products is lost.

Chapter 2 - Requirements for conveyor scales

Section I - General requirements

§ 6. Measuring Technical protection and quality level An instrument shall provide a high level of metrological protection so that all interested parties can have confidence in the measurement results, and it must be designed and manufactured to satisfactory quality level with regard to measurement technology and measurement data security.

§ 7. Intended use and foreseeable misuse shall be taken into account transportbåndvektens intended use and the foreseeable misuse when selecting solutions adopted to meet the requirements.

§ 8. Allowable error Under rated operating conditions and in the absence of a disturbance to measure the error does not exceed the maximum permissible error as specified in § 30 and § 31
Unless otherwise specified in Section II, expressed the maximum permissible error of the deviation from the true measurement value as a bilateral.
Under operating conditions and when there is a disturbance, the performance requirement as laid down in Section II.
If the belt weigher is intended for use in a given permanent continuous electromagnetic field, the measurement result during the experiment with amplitude-modulated electromagnetic fields lie within the maximum permissible errors.

§ 9. The manufacturer shall specify the climatic and electromagnetic environments in which the belt weigher is intended to be used, as well as power supply and other influence quantities likely to affect its accuracy, taking into account the requirements set out in Section II.

§ 10. Climatic environmental manufacturer shall specify the upper and lower temperature limit from the values ​​in Table 1 and indicate whether the belt weigher is designed for condensing or non-condensing humidity as well as the intended location is open or closed.
Table 1

Upper temperature limit
30 ° C
40 ° C
55 ° C
70 ° C

Lower temperature limit
5 ° C
-10 ° C
-25 ° C
-40 ° C

§ 11. Electromagnetic environment Unless otherwise provided in Section II classified the electromagnetic environment in the following classes:
Table 2

E1 This class includes conveyor scales used in locations with electromagnetic disturbances corresponding to those likely to be found in buildings used for residential and commercial purposes, and light industrial buildings.

E2 This class includes conveyor scales used in locations with electromagnetic disturbances corresponding to those likely to be found in other industrial buildings.

E3 This class includes conveyor scales that get power from the battery in a vehicle. Such scales shall meet the requirements of E2 and the following additional requirements:
voltage drop caused by energizing the starter circuit of internal combustion engines and voltage transients when disconnecting depleted battery while the engine is running.

Consideration should be given to the following influence quantity associated with electromagnetic environments:

Voltage Interruption

Short voltage reductions


Voltage transients on supply lines and / or signal lines, electrostatic discharge

High-frequency electromagnetic fields

Transmitted radio frequency electromagnetic fields on the supply lines and / or signal lines

Surge on supply lines and / or signal lines.

Consideration should be given to the following additional influence quantities as appropriate:

Voltage Variation

Variations in mains frequency

Power frequency magnetic fields

Other size can affect transportbåndvektens accuracy significantly.

§ 12. Basic rules for testing and the determination of errors The basic requirements specified in § 8 shall be verified for each relevant influence quantity. Unless otherwise specified in Section II, these basic requirements when each influence quantity is applied and its effect evaluated separately, all other influence quantities being kept relatively constant at their reference values.
Metrological tests shall be carried out during and after the application of the influence quantity, whichever corresponds to the normal operational status of the belt weigher when that influence quantity is likely to occur.

§ 13. Humidity According to the climatic environment belt weigher is intended to be used, may be the most appropriate test stream either the damp heat (non-condensing) or damp heat cyclic (condensing).
Cyclic test varying moisture is appropriate where condensation is important or when penetration of vapor will be accelerated by ventilation. When conditions where non-condensing humidity is important, test the damp heat appropriate.

§ 14. Reproducibility The weigher is used to measure the same measurand but in different places and by different users, the results of successive measurements in close agreement. Difference between the measurement results shall be small relative to MPE.

§ 15 Repeatability The measurand have the same value and the measuring conditions are unchanged, the subsequent measurement results correspond well. Difference between the measurement results shall be small relative to the maximum permissible error.

§ 16. Resolution and sensitivity An instrument shall be sufficiently sensitive and must be sufficient for the intended measurement task.

§ 17. Durability An instrument shall be so constructed that its metrological characteristics are sufficiently stable for a period estimated by the manufacturer, provided that it is installed, maintained and used according to manufacturer instructions and in the environment it is intended for.

§ 18. Reliability An instrument shall be designed so that the effect of a defect that would lead to an inaccurate measurement result, is reduced as much as possible, unless such mistakes are obvious.

§ 19. Suitability An instrument shall be:

suitable for its intended use, taking into account of the practical working conditions, and it shall not be unreasonable demands of the user to obtain a correct measurement result

Robust and made of materials suitable for the intended operating conditions

Constructed so that measurement function to be controlled by the weight is marketed and used. If necessary, special equipment or software for this control shall be part of the belt weigher. The test procedure shall be described in the user manual

insensitive to small variations in the value of the measurand, or it will respond in an appropriate manner if the measuring instrument is intended to measure the value of the measurand that is constant over time.

An instrument shall not be of such a nature that it can easily be used for fraud, and the possibility of unintentional misuse shall be minimal.
If a conveyor weight has associated software with other functions besides the measuring function, the software that is critical for the metrological characteristics shall be identifiable and shall not be inadmissibly influenced by the associated software.

§ 20. Protection against corruption If the belt weigher is connected to another device directly or by remote connection, should its metrological characteristics are not affected by the arrangement is inappropriate. Components that is critical for metrological characteristics shall be designed so that they can be secured. Security measures should make it possible to determine whether the intervention has taken place.

Software that is critical for metrological characteristics shall be identified as such and shall be secured. Software identification shall be easily obtained from the belt weigher. Evidence that there has been an intervention shall be available for a reasonable period.
Measurement data, software that is critical for measurement characteristics and metrologically significant parameters stored or transmitted shall be adequately protected against accidental or intentional corruption.

§ 21. Information to be borne follow weigher An instrument shall be applied manufacturer's mark or name and information about Scale accuracy. To the extent applicable, shall be the following information is included on the belt weigher:

Relevant information on conditions of use

Measuring Capacity

Measuring range

Identity Brand

Number of the certificate of EC type-approval or EC design examination

information about options that provide test results comply with the provisions of the regulations issued regarding regulated metrological control.

Details of operation will follow the belt weigher with less weight is so simple that this is unnecessary. The information must be easily understood, and shall include where relevant following:

Specified operating conditions

Electromagnetic Environment

Upper and lower temperature limit, whether condensation is acceptable or not, open or closed location

instructions for installation, maintenance, repairs, permissible adjustments

Directions for correct operation and any special conditions of use

Conditions for compatibility with interfaces, sub-assemblies or measuring instruments.

Groups of identical conveyor scales is not required individual manuals. All marks and inscriptions shall be clear and unambiguous and should not be removed or moved.

§ 22. Display of measured value Unless otherwise specified in Section II, the minimum share for a measured value to the form 1 × 10n, 2 × 10n or 5 × 10n, where n is an integer or zero. Of measurement or its symbol shall be shown close to the numerical value.
Shall be used measurement units and symbols that are in accordance with the provisions of regulations on measurement units and measurement.

§ 23. Display of results The results should appear on a display or hard copy. By copy the print or record shall also be easily legible and could not be removed.
Any result shall be clear and unambiguous and accompanied by such marks and inscriptions necessary to inform the user of significance of the result. The result displayed should be easily readable under normal conditions. Further information can be displayed on the condition that it can not be confused with the metrologically controlled results.

§ 24. Further processing of data to conclude the trading transaction Conveyor weight should a durable means the measurement result accompanied by information to identify the particular transaction, when the measurement is non-repeatable and weight normally intended to be used when one party to the transaction is absent.
Additionally, a durable proof of the measurement result and the information to identify the transaction shall be available on request the measurement is concluded.

§ 25. Conformity assessment An instrument shall be designed so that it can be easily assessed whether it complies with the relevant requirements of these regulations.

Section II - Specific requirements

§ 26. Specified operating conditions The manufacturer shall specify the nominal operating conditions as follows:

For the measurand: The measuring range in terms of maximum and minimum load

For influence quantities of electricity:

For AC power supply:

Nominal AC voltage, or limits AC voltage

For a DC supply: Nominal and minimum DC voltage, or limits DC voltage

For the mechanical and climatic influence quantities: The minimum temperature range is 30 ° C. For measuring instruments used under special mechanical strain, eg. measuring instrument built into vehicles, the manufacturer shall define the mechanical conditions of use

For other influence quantities in the relevant areas:

Working speed (s)

Features of the product (s) for weighing.

§ 27. Suitability Means shall be provided to limit the effects of tilt, loading and working speed so that the maximum value of the maximum permissible errors are not exceeded in normal operation. There should be appropriate arrangements for material handling and an appropriate reset function, so that the belt weigher can comply with the maximum permissible errors during normal operation.
Actuating interface shall be clear and effective. The operator shall be able to check that any indicator is reliable. Results that fall outside this range shall be identified as such if it is possible to print.

§ 28. Accuracy classes Belt weighers are divided into three accuracy classes. Table 3 shows the accuracy classes and application of these in relation to the type of weighing.
Table 3

Accuracy class 0.5:
used for weighing of processed products and similar commercial transactions.

Accuracy Class 1:
Used for weighing of sand, gravel, ores and upon receipt of the fish.

Accuracy Class 2:
used for calculation of freight, tariff, etc. In addition, they can be used for weighing of sand, gravel and ore, but this will be considered in each case.

By weighing the products other than those mentioned above, Metrology in each case determine the accuracy class of the belt weigher.

§ 29. Measuring ranges manufacturer shall specify the measurement range, the ratio between the minimum net load on the weighing unit and largest capacity, and minimum totalized load.
Minimum totalized load, Σmin shall be at least:

800 d for class 0,5,

400 d for class 1 and

200 d for class 2

Where d is the summing sharing summing hovedindikeringsenheten.

§ 30. Maximum permissible errors for conveyor scales sold or offered for sale Table 4

Accuracy class Permissible measurement error as a percentage of the summed amount

± 0.25%

± 0.50%

± 1.00%

§ 31. Maximum permissible errors for conveying weights during operation Table 5

Accuracy class Permissible measurement error as a percentage of the summed amount

For periodic check
By monitoring control

± 0.50%
± 0.25%

± 1.00%
± 0.50%

± 2.00%
± 1.00%

§ 32. The tape speed manufacturer shall specify the speed of the conveyor belt. For beltscales single speed, and beltscales multi-speed with manual speed control, the speed shall not vary by more than 5% of the nominal value. The product shall not have a different speed than the speed of the belt.

§ 33. Summing hovedindikeringsenhet It shall not be possible to reset the summing hovedindikeringsenheten.

§ 34. Benefits under influence quantities and electromagnetic interference maximum permissible error due to influence quantity for a load of at least Σmin shall be 0.7 times the appropriate value specified in Table 4 and 5, rounded to the nearest summed interval (d) .
The critical change value due to a disturbance shall be 0.7 times the appropriate value specified in Table 4 and 5 for a load equal Σmin, for given accuracy class, rounded up to the next summed interval (d).

Chapter 3 - Final provisions

§ 35. Fine Violation of this regulation may result in imposition of fines meted out under the provisions of regulations on measurement units and measurement Section 7

§ 36. Commencement This Regulation shall enter into force on 1 January 2008.