ISO 13517-2020 pdf download.Metallic powders – Determination of flow rate by means of a calibrated funnel (Gustavsson flowmeter).
6 Calibration of the funnel
6.1 Calibration by the manufacturer of the funnel
The manufacturer shall supply the flowmeter calibrated as follows.
a) Dry the reference grit (5.5) in an open and dean glass jar at ItO C for 60 mm in air.
b) Cool the reference grit to room temperature in a desiccator.
c) Weigh out 50.0 g ± 0,1 gal the grit.
d) Follow the procedure outlined in Clauaeil.
e) Repeat the procedure with the same SO g mass of the grit, until there are live determinations within 0.4 a;
1) The average althese live determinations is stamped on the bottom of the funnel and shall be within
40,0 a ± 0,5 a.
6.2 Calibration by the user of the funnel
The flow rate of the reference sample shall be determined by the above method. If the flow rate has changed to be outside 40,0 s/SO g ± 0,5 s/50 g. a correction [actor shall be used when measuring different 1owdrs. This correction factor Is obtained by dIviding 40,0 by this new value for the Reference grit.
It Is recommended that the users periodically verify whether a correction Is needed or not.
It Is recommended that, before a correction factor Is adopted, the cause of the change be Investigated. If the flow rate has decreased, It is probable that repeated use has burnished the orifice and a (new) correction factor is justified. An increase in flaw rate may indicate a coating at soft powder on the orifice. This coating should be carefully removed and the calibration test repeated.
It is recommended that the use of a funnel he discontinued after the duration of flow of the reference sample has decreased to less than 37s.
7 Sampling
7.1 [he mess ulihe test sample shall beet least 4X) g.
7.2 In general, the powder shall be tested in the as-received condition. In certain cases, and after agreement between the supplier and user, the powder may be dfled, However, if the powder Is susceptible to oxidation, the drying shall take place in a vacuum or in Inert gas. lIthe powder contains volatile substances, it shall not be dried.
7.3 Immediately before the test, weigh out a 50,0 g ±0,1 g test portion.
7.4 Alternatively a test portion of 90 g to 110 g can he sampled and weighed to a precision of ± 0.1 g or better.
NOTII The Intention of the alternative execution is to facilitate lull automation of measurement of flow and apparent density of powders.
75 The determination shall be carried out on three test portions.ISO 13517 pdf download.