BS-EN-15238-2006.pdf
BRITISH STANDARD BS EN 15238:2006 Soil improvers and growing media Determination of quantity for materials with particle size greater than 60 mm The European Standard EN 15238:2006 has the status of a British Standard ICS 65.080 ? Licensed Copy: London South Bank University, London South Bank University, Thu Jan 18 01:19:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 15238:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2007 © BSI 2007 ISBN 978-0-580-49921-0 National foreword This British Standard was published by BSI. It is the UK implementation of EN 15238:2006. The UK participation in its preparation was entrusted to Technical Committee AW/20, Top soil and other growing media. A list of organizations represented on AW/20 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Thu Jan 18 01:19:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 15238 December 2006 ICS 65.080 English Version Soil improvers and growing media - Determination of quantity for materials with particle size greater than 60 mm Amendements du sol et supports de culture - Détermination de la quantité pour les matériaux de granulométrie supérieure à 60 mm Bodenverbesserungsmittel und Kultursubstrate - Bestimmung der Menge für Materialien mit einer Partikelgröße über 60 mm This European Standard was approved by CEN on 21 October 2006. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2006 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15238:2006: E Licensed Copy: London South Bank University, London South Bank University, Thu Jan 18 01:19:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 15238:2006 (E) 2 Contents Page Foreword. 3 Introduction 4 1 Scope 5 2 Normative references . 5 3 Terms and definitions. 5 4 Symbols and abbreviated terms 6 5 Principle. 6 6 Apparatus 6 7 Calibration of the measure. 8 8 Sampling 9 9 Method for density determination. 9 10 Calculation and expression of results 10 11 Precision 11 12 Test report for declarations of volume. 11 13 Weight 11 14 Test report for declarations of weight 12 Annex A (informative) Results of an interlaboratory trial to determine density 13 Bibliography . 14 Licensed Copy: London South Bank University, London South Bank University, Thu Jan 18 01:19:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 15238:2006 (E) 3 Foreword This document (EN 15238:2006) has been prepared by Technical Committee CEN/TC 223 “Soil improvers and growing media”, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2007, and conflicting national standards shall be withdrawn at the latest by June 2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Thu Jan 18 01:19:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 15238:2006 (E) 4 Introduction Soil improvers and growing media are generally traded by volume as the weight of the product can be greatly affected by the moisture content. It is important for both consumers and traders to know the volume of product being traded. Furthermore, for the cultivation of plants, it is the volume of the product, and not the weight, that is generally important. The volume is calculated from knowing the weight and density of the product, the latter being determined from weighing a known reference volume of product. As some soil improvers and growing media are compressible it is important that this aspect be addressed in the method of determining the density. A suitably competent person should undertake this testing. For those materials traded by reference to its mass, this document recognises the effects the moisture content can have on the quantity declared. Therefore, for such transactions, any weight is accompanied by the moisture content so that the solid matter content can be calculated. Licensed Copy: London South Bank University, London South Bank University, Thu Jan 18 01:19:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 15238:2006 (E) 5 1 Scope This standard specifies a method for the determination of quantity of soil improvers, excluding liming materials and growing media in bulk and in packages. This is a reference method, which is designed with an appropriate precision level aimed at enabling validation of any quantity declaration made. This document applies to material that is in solid form, but not in block form to be sold by dimension, and which exceeds the particle size restriction in EN 12580 1 and where the declared nominal particle size is greater than 60 mm. This method is applicable for products where a mass fraction of less than 10% of material is retained on the 100 mm fall controller. NOTE 1 The requirements of this standard may differ from the national legal requirements for the declaration of quantity for the products concerned. NOTE 2 Where there is no legal requirement to use this method, for example in quantity control of packaged product, then it is permissible for any other methods to be used so long as these other methods can be demonstrated to be comparable with this standard method in giving the same quantity with the same precision. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12579:1999, Soil improvers and growing media Sampling EN 13040, Soil improvers and growing media Sample preparation for chemical and physical tests, determination of dry matter content, moisture content and laboratory compacted bulk density EN 45501, Metrological aspects of non-automatic weighing instruments 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 batch quantity of goods manufactured by the same process under the same conditions and labelled in the same manner and assumed to have the same characteristics 3.2 bulk material material that is not packaged 3.3 container any container, including lorry, boat, and package 3.4 density density of the material as received or reconstituted for use in accordance with the manufacturer's instructions, determined by the method specified in this standard Licensed Copy: London South Bank University, London South Bank University, Thu Jan 18 01:19:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 15238:2006 (E) 6 3.5 package container in which the goods are delivered and which remains with them after delivery 3.6 strike transparent sheet of flat material, normally glass, which is easily large enough to cover the top of the measure. 3.7 volume out-turn volume determined by the method specified in this standard. 4 Symbols and abbreviated terms For the purposes of this document, the following symbols and abbreviated terms apply: D density of material, as determined by the method specified in this standard; V the volume of material; mx the mass of an item. 5 Principle 5.1 For each batch of material, whether for delivery in bulk or in packages, the quantity of material is determined and declared either by volume or by weight. 5.2 Where the quantity declared is by volume then the material is weighed and then sampled and its density determined. From this information the volume is calculated. 5.3 Where the quantity declared is by weight then the moisture content is also determined so that the dry matter weight can be determined and declared. NOTE The structure of the material may change with time and handling and this may affect the volume of the material. 6 Apparatus 6.1 Measure, Rigid, 50 l ± 1 l with a height to diameter ratio between 0,95:1 and 1:1, calibrated in accordance with Clause 7. The volume, V1 shall be determined to the nearest 20 ml at 20 °C, with an uncertainty of measurement (k=2) of no more than 100 ml. NOTE 1 Information about the measurement and expression of uncertainty is given in the OIML Guide (G1) to the expression of uncertainty in measurement, (sometimes referred to as GUM). NOTE 2 A 400 mm internal diameter pipe of height 398 mm with an end cap may be suitable. NOTE 3 For easy and safe handling of the filled measure, lifting and emptying handles are advisable. For health and safety reasons, the filled measure may require two persons to lift it. 6.2 Collar, Rigid, of the same diameter as the measure (6.1) and with a height of 75 mm ± 5 mm. Equipped with locating lugs to enable it to sit on the measure correctly. Licensed Copy: London South Bank University, London South Bank University, Thu Jan 18 01:19:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 15238:2006 (E) 7 6.3 Fall Controller, A fall controller of 100 mm ± 5 mm mesh size, held no more than 50 mm above the collar, equipped with locating lugs to enable it to sit on the collar correctly. NOTE Wires crossing each other perpendicularly form the mesh with 100 mm square holes. Figure 1 shows a diagram of the apparatus as described in 6.1 to 6.3. 1 2 3 Key 1 Fall controller of square mesh with 100 mm ± 5 mm openings held not more that 50 mm above filling collar 2 Filling collar of same internal diameter as cylinder, height 75 mm ± 5mm 3 Measuring cylinder, rigid (50 ± 1) l, e.g. 400 mm internal diameter, height 398 mm NOTE 1 For convenience and ease of use it is advisable to have 3 handles on the cylinder (2 for lifting and the third for tilting) and 2 on the filling collar and fall controller. NOTE 2 The fall controller and filling collar should each have 4 locating lugs. NOTE 3 The measuring cylinder should have 3 short legs so that it sits level. Figure 1 Measuring cylinder, collar and fall controller 6.4 Weighing Instrument, used to determine the density of the material by this method conforming to EN 45501 and with a scale division no larger than 0,01kg. NOTE National legislation is likely to require that the equipment be verified before use, and so it will be marked with the CE mark and a green M to show it is legal to use for trade purposes, as required by Directive 90/384/EEC. Licensed Copy: London South Bank University, London South Bank University, Thu Jan 18 01:19:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 15238:2006 (E) 8 The weighing instrument used for determining the mass of the total quantity of product (a bag or consignment) shall be a class III weighing instrument complying with Directive 90/384/EEC. In order for the error on the weighing instrument to be acceptable the maximum scale interval should conform to the requirements in Table 1. Table 1 Maximum scale intervals for weighing instruments Mass, kg Maximum scale interval for analogue instrument, g Maximum scale interval for digital instrument, g up to 100 20 10 100 to 1 000 200 100 1 000 to 5 000 2 000 1 000 5 000 20 000 10 000 6.5 Straight edge, rigid, of rectangular cross section, of thickness not exceeding 5 mm, preferably with a sharp edge, and at least 700 mm long. 6.6 Shovel or scoop, that preserves the characteristics of the product, with dimensions sufficient to take a representative portion. NOTE 1 Use of hands is unlikely to ensure a representative sample is transferred to the measure. NOTE 2 A snow or grain shovel may be suitable for large, coarse material. 7 Calibration of the measure To calibrate the measure, place the measure and sufficient water together in a room so that the temperature of both stabilizes. Determine the temperature, t. Weigh it empty together with a strike, note its mass in kilograms, me. (A strike is a transparent sheet of flat material, normally glass, which is large enough to easily cover the top of the measure.) Weighings shall be made in kilograms on a weighing instrument with no greater than 10 g divisions, which complies with EN 45501. Fill to the brim with water using the strike. When the water level is near the top of the measure, start to slide the strike onto the rim of the measure and pick up the meniscus of the water on its underside. Filling continues gradually, continuing to slide the strike over the surface of the measure so that no air bubbles are trapped under it. The measure is completely filled when the strike covers the top of the measure without any air being trapped under it. Weigh the filled measure and strike in kilograms, mass, mf. Calculate the mass of water, mw = mf me. Calculate the volume of water by multiplying by the factor given in the table below. This gives the volume of the measure, Vt, in litres, at the temperature, t, at which it has been calibrated. Weigh the filled measure and strike, mass, mf. Calculate the mass of water, mw = mf me. Licensed Copy: London South Bank University, London South Bank University, Thu Jan 18 01:19:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 15238:2006 (E) 9 Table 2 Multiplication factor at various t
