EN 1237-1995 pdf download.Fertilizers – Determination of bulk density ( tapped ).
This EN 1237 specifies a method for the determination of the bulk density (tapped) of solid fertilizers, except powder fertilizers. The method is applicable to free.flowing fertilizers.
The method is not suitable for materials which contain more than 20 % by mass of particles exceeding 5 mm in diameter.
Annex ZA lists the bibliography.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers ofcurrently valid International Standards. Iso 3944:1992, Fertilizers — Determination of bulk density (loose).
3 Definition
For the purposes of this International Standard, the following definition applies.
3.1
bulk density (tapped) of a fertilizer
the mass per volume of a material tipped into a container and then compacted under clearly specified conditions
4 Preparation of test sample
Prepare the test sample by appropriate methods, ensuring that the sample is sufTicient to carry out two separate determinations.
5 Method — Machine-tapping method
5.1 Principle
Pouring of the fertilizer from a specified funnel into a specified measuring cylinder of known volume, tapping by means of a tapping machine, and weighing of the contents of the cylinder.
5.2 Apparatus
5.2.1 Balance, capable of weighing to the nearest 1 g.
5.2.2 Apparatus for determination of bulk density (‘loose), according to Iso 3944, with a collar of transparent plastic and a measuring-cylinder holder with guide clamp (see Figure 1).
5.2.3 Tapping machine, having a camshaft the cams of which lift the guide clamp, measuring-cylinder holder and measuring cylinder once ver revolution. The rotational frequency of the camshaft shall be (250 ± 15) revolutions mm ‘(See Figure 1.)
5.2.4 Spatula, approximately 120 mm X 20 mm, or other suitable scraper.
5.3 Procedure
Pour into the closed funnel of the apparatus (5.2.2) a quantity of the fertilizer greater than that needed to fill the measuring cylinder.
Fully open the slide of the funnel so that the contents discharge into the measuring cylinder in 6 s to 12 s.
If the fertilizer does not flow freely, keep the outlet clear by inserting a rod of 3 mm to 4 mm diameter into the opening.
Remove the measuring cylinder from its holder, slip on the plastic collar and add by hand a quantity of fertilizer such that, after tapping, the fertilizer still remains several centimetres above the top of the measuring cylinder.
Place the measuring cylinder firmly in its holder in the tapping machine, and tap 2 500 times. Remove the measuring cylinder from the tapping machine, remove the collar, and scrape away the surplus fertilizer heaped on the measuring cylinder by means of the spatula (5.2.4).
Weigh the contents of the measuring cylinder to the nearest I g of the total mass.
6.2 Repeatability
The difference between the results of two determinations, carried out in rapid succession by the same operator using the same apparatus, shall not exceed 10 kg/rn3.
7 Test report
The test report shall include the following particulars:
a) identification of the sample;
b) reference to the method used;
c) the result and the method of expression;
d) any unusual features noted during the
determination;
e) any operation not included in this
International Standard or regarded as optional;
1) methods of sampling and sample preparation.EN 1237-1995 pdf download.
EN 1237-1995 pdf download
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