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Overview
AS-300 Hall Flowmeter (Funnel) /Hall Flow Meter (Funnel) determines both Flow Rate and Apparent Density of free-flowing metallic powders as well as other fine powders in various particle size distributions with calibrated hall flowmeter funnel according to International Standards
● ASTM B213 Standard Test Method for Flow Rate of Metal Powders
● ISO 4490 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall Flowmeter)
● MPIF No.3
● ASTM B212 Standard Test Method for Apparent Density of Free Flowing Metal Powders Using the Hall Flowmeter Funnel
● MPIF No.4 Std. 04—Apparent Density of Free-Flowing Metal Powders Using the Hall Apparatus
● ISO No. 3923-1 Metallic powders - Determination of apparent density - Part 1 Funnel method

In addition AS-300 determines Apparent Density of non-free-flowing powers with Carney Funnel according to International Standards
● ASTM B417 Standard Test Method for Apparent Density of Non-Free-Flowing Metal Powders Using the Carney Funnel
● MPIF No.28
● ISO No.3923-1

Principle
● Flow Rate
AS-300 Hall Flowmeter Funnel determines the flow rate by measuring the time taken by 50 gram of a metal powder to flow through a calibrated hall flowmeter funnel/orifice of standardized dimensions(0.1 inch/2.5mm) according to International Standards.
● Apparent Density of free-flowing powders
AS-300 determines the apparent density by permitting a volume or certain quantity of powder in a loose condition to flow from a hall flowmeter funnel orifice Diameter 0.1 inch/2.5mm into a specified density cup of definite volume(25cm3) under controlled conditions. The mass of powder per unit volume (the ratio between the mass and the volume) is recorded and reported as apparent density.
● Apparent Density of non-free-flowing powders
AS-300 determines the apparent density by permitting a volume or certain quantity of powder in a loose condition to flow from a carney funnel diameter 0.2 inch/5.0mm into a specified density cup of definite volume(25cm3) under controlled conditions. The mass of powder per unit volume (the ratio between the mass and the volume) is recorded and reported as apparent density.

Apparatus
● Powder Hall Flowmeter Funnel/Calibrated flowmeter funnel
● Stand and horizontal vibration-free base
● Density cup/Cylindrical Cup
● Timing Device/Stopwatch
● Chinese Emery Grit
● Carney Funnel
● Balance
● Spatula
● Wire
(Above apparatus are subject to quotation)

Applications
Powder metallurgy, metallic powders, food powders, cement powders, plastic powders, rubber powders, ceramic powders, pharmaceutical powders etc.

Manufacturer
-AimSizer Scientifc is a world leading and reliable manufacturer of Hall Flowmeter/Hall Flow Meter Funnels and Carney Funnels. All the metallic parts are processed and supplied by qualified subcontractor according to International Standards in order to make the unit accurate and robust for sale to satisfy the user's requirement at cost-effective basis.

-AimSizer is also a major research participant in the interlaboratory study of the flow of Chinese Emery. Chinese Emery is used to calibrate a hall flowmeter funnel by the manufacturers.

-AimSizer is also the original manufacturer of Chinese Emery according to ASTM B213 and other international standards using such certified reference material.

Frequently Asked Questions
42. What is the explanation of Repeatability according to ASTM B213 Standard Test Method for Flow Rate of Metal Powders by using a hall flowmeter funnel?
-Repeatability intervals,r,are listed in Table 1 in ASTM B 213.In 95% of flow rate determinations,on the basis of test error alone,duplicate tests in the same laboratory by the same operator on one homogeneous lot of powder will differ by no more than the stated amount in seconds.

41. What is the explanation of Precision according to ASTM B213 Standard Test Method for Flow Rate of Metal Powders by using a hall flowmeter funnel?
-The precision has been determined from an interlaboratory study performed by seven laboratories of Sub committee.AimSizer took part in the interlaboratory research and has become a major participant in such research and the original manufacturer of calibration powder chinese emery.

40. How to report the test data of hall flow rate according to ASTM B213 Standard Test Method for Flow Rate of Metal Powders by using a hall flow meter funnel?
-After test by a hall flow meter funnel, report the corrected flow rate in seconds to the nearest second.

39. What to do after calculating correction factor of a hall flowmeter funnel according to ASTM B 213 Standard Test Method for Flow Rate of Metal Powders?
-After obtaining the correction factor, multiply the elapsed time by the desired correction factor.

38. How to calculate the flow rate of metal powders using a hall flow meter funnel according to ASTM B 213 Standard Test Method for Flow Rate of Metal Powders?
-After measurement of hall flow rate of metal powders,calculate the correction factor by dividing 40.0 by either the flow rate stamped on the bottom of the funnel, or the new calibratioin flow rate established according to calibrationi of apparatus 9.3 of ASTM B 213.

37. What is the procedure of second test method in ASTM B 213 Standard Test Method for Flow Rate of Metal Powders using a hall flow meter funnel?
-The method 2 Moving Powder Start to Flow Measurement includes the following steps:1.Place an empty receptacle directly under the discharge orifice.2.Weigh out a 50.0 g mass of powder,as sampled,into a clean weighing dish.3.Pour the 50.0 g powder specimen into the center of the funnel and start the stopwatch the instant the powder exists the orifice.4.Stop the stopwatch the instant the last of the powder exists the orifice.5.Record the elapsed time to the nearest .01 s.6.More than one flow may be run if desired. Use a fresh 50.0 g quantity of powder for each flow test. Average the flow times.

36. What is the second testing method in ASTM B 213 using a hall flow meter funnel?
-The second testing method in ASTM B 213 is Moving Powder Start to Flow Measurement.

35. What is the test procedure of method 1 Stationary Powder Start to Flow Measurement according to ASTM B 213 Standard Test Method for Flow Rate of Metal Powders using a Hall Flow Meter Funnel?
-1.Weight out a 50.0 g mass of powder, as sampled, into a clean weighing dish.2.Block the discharge orifice at the bottom of the funnel with a dry finger.3.Carefully pour the 50.0 g sample of powder into the center of the flowmeter funnel without any tapping, vibration or movement of the funnel.4.Place the emptied weighing dish on the flowmeter stand directly under the funnel orifice.5.Simultaneously start the stopwatch and remove your finger from the discharge orifice.6.If the powder fails to start flowing,one light tap on the funnel rim is permitted. Further tapping of the funnel,however,or poking or stirring the powder in the funnel with a wire or any other implement is not permitted.7.Stop the stopwatch the instant the last of the powder exists the orifice.8.Record the elaspse time to the nearest 0.1 s.9. More than one flow may be run if desired. Use a fresh 50.0 g quantity of powder for each flow test. Average the flow times.

34. What is the stationary testing method of flow rate by ASTM B 213 Standard Test Method for Flow Rate of Metal Powders using a hall flow meter funnel?
-Stationary powder start to flow measurement procedure does not let the powder go until 50 g mass of powder is completely loaded into a hall flow meter funnel.

33. How many testing procedures recommended by ASTM B 213 Standard Test Method for Flow Rate of Metal Powders using a hall flow meter funnel?
-There are two testing methods are recommended by ASTM B 213 Standard Test Method for Flow Rate of Metal Powders using a hall flow meter funnel.One is stationary powder start to flow measurement, the other is moving powder start to flow measurement.

32. What if the flow rate of chinese emery is less than 37 s according to ASTM B 213 Standard Test Method for Flow Rate of Metal Powders using a hall flow meter funnel?
-It is recommended that the use of a hall flowmeter funnel be discontinued after the flow rate of the chinese emery that is the calibration powder has increased such that the time of flow is less than 37 s.

31. What could be the main cause if the flow rate of a hall flow meter funnel has decreased according to ASTM B 213 Standard Test Method for Flow Rate of Metal Powders?
-A decrease in flow rate (slower flow) may indicate a plating of soft powder upon the orifice. This should be removed carefully with the aid of a pipe cleaner and the calibration test rerun, the new correction factor being calculated if required.

30. What could be the main reason if the flow rate of a hall flow meter funnel has increased according to ASTM B 213 Standard Test Method for Flow Rate of Metal Powders using a hall flow meter funnel?
-Before adopting the new correction factor, however, it is recommended that the cause of the change be investigated. If the flow rate has increased (faster flow), it is probable that repeated use has burnished the orifice and the new correction factor may be used.

29. How to determine the hall flow meter funnel correction factor in ASTM B 213 Standard Test Method for Flow Rate of Metal Powders?
-If the hall flow rate has changed from that stamped on the instrument, the new correction factor will be 40.0 divided by this new flow rate.

28. What if the hall flow rate has changed from standard in ASTM B 213 Standard Test Method for Flow Rate of Metal Powders?
-According to international standard ASTM B 213 Standard Test Method for Flow Rate of Metal Powders,if the hall flow rate has changed from that stamped on the instrument,i.e. hall flow meter funnel, the new correction factor will be used to calculate the hall flow rate.

27. How long is it recommended by ASTM B 213 Standard Test Method for Flow Rate of Metal Powders to check the flow rate of hall flow meter funnel?
-ASTM B 213 Standard Test Method for Flow Rate of Metal Powders recommend the hall flow rate be checked using Chinese emery calibration powder periodically, at least every six months, using the procedure outlined in No.9 Calibration of Apparatus steps 9.1.1-9.1.5.

26. Does AimSizer attend the interlaboratory study of determining the flow rate of Chinese emery powder?
-The flow rate of Chinese emery powder was established by an interlaboratory study conducted by Subcommitte B09.02 in 1995.It represents the flow rate through the master flowmeter funnel that had been used in a previous interlaboratory study with the former Turkish emery calibration powder,which is no longer available.AimSizer Scientifc is a world leading and reliable manufacturer of Hall Flowmeter/Hall Flow Meter Funnels and Carney Funnels. All the metallic parts are processed and supplied by qualified subcontractor according to International Standards in order to make the unit accurate and robust to satisfy the user's requirement at cost-effective basis.
AimSizer is also a major research participant in the interlaboratory study of the flow of Chinese Emery. Chinese Emery is used to calibrate a flowmeter funnel by the manufacturers.
AimSizer is also the original manufacturer of Chinese Emery according to ASTM B213 and other international standards using such certified reference material.

25. Where to stamp average of five flow times after calibrating hall flowmeter funnel using chinese emery?
-After testing chinese emery for 5 times,the average of five flow times after calibrating hall flowmeter funnel using chinese emery is usually stamped on the bottom of the hall flow meter funnel.

24. What factor will influence calibrating hall flow meter funnel other than normal procedures?
-The flow rate of Chinese emery calibration powder is sensitive to moisture. Starting from the dried condition, it will absorb moisture from the ambient air as five (or ore) flow tests are performed. Flow times can vary dependent upon the humidity of the test area.

23. What extremes of 5 tests's difference during calibrating hall flow meter funnel by Chinese emery?
-For this part manufacturer of hall flowmeter funnel should use identifcal 50.0 g mass of emery for all the tests until 5 flow times, the extremes of which shall not differ by more than 0.4 s and record test results.

22. How many times is needed during calibrating hall flow meter funnel by testing Chinese emery?
-For this part manufacturer of hall flow meter funnels should use identical 50.0 g mass of emery for all the tests until 5 flow times.

21. Powder hall flowmeter funnel calibration procedures in astm b 213-second step?
-The calibration procedures of hall flow meter funnel take several steps, the second is to cool the emery to room temperature in a dessicator

20. Powder hall flowmeter funnel calibration procedures in astm b 213-second step?
-The calibration procedures of hall flow meter funnel take several steps, the second is to cool the emery to room temperature in a dessicator.

19. Powder hall flowmeter funnel calibration procedures in astm b 213-first step?
-The calibration procedures of hall flow meter funnel take several steps, the first one has to heat an open glass jar of Chinese emery in a drying oven at a temperature of 102 Celsius degree to 107 Celsius degree (215 to 225 Fehrenheit degree) for one hour.

18. Where to buy a hall flowemter funnel,stand and Chinese emery in ASTM B 213?
-AimSizer Scientifc is a world leading and reliable manufacturer of Hall Flowmeter/Hall Flow Meter Funnels and Carney Funnels. All the metallic parts are processed and supplied by qualified subcontractor according to International Standards in order to make the unit accurate and robust to satisfy the user's requirement at cost-effective basis.

-AimSizer is also a major research participant in the interlaboratory study of the flow of Chinese Emery. Chinese Emery is used to calibrate a flowmeter funnel by the manufacturers.

-AimSizer is also the original manufacturer of Chinese Emery according to ASTM B213 and other international standards using such certified reference material.

17. How to prepare apparatus in ASTM B 213 about hall flow meter funnel?
-Before determining the flow rate by hall flowmeter funnel, clean the hall flowmeter funnel with a clean dry toweling paper,then clean the hall flowmeter funnel orifice with a clean dry pipe cleaner.

16. What standard is applied when sampling in ASTM B213 about hall flow meter funnel?
-A quantity of powder sufficient to run the desired number of flow tests shall be obtained in accordance with Practices ASTM B 215.

15. What is the function of a Balance in apparatus of Hall Flow Meter (Funnel)?
-When user determines the flow rate of metal powders or other powders,a Balance is needed.It is used to weigh the mass of the powder to be tested.It is capable of weighing at least 50.0 gram and to the nearests 0.1 gram

14. What is the function of a Chinese Emery in apparatus of hall flow meter(funnel)?
-When we determine the flow rate of metal powders we need Chinese Emery.It is used to calibrate the flowmeter funnel.It is a standardized emery grit used to periodically checking the calibrationn accuracy of the hall flow meter funnel.When the accuracy of the hall funnel goes out of permitted tolerances,user has to purhcase a new hall flowmeter funnel for replacement.

13. What is the function of a Timing Device in apparatus of hall flow meter(funnel)?
-When we determine the flow rate of metal powders we need a Timing Device,it is usually a stopwatch capable of measuring the time taken by 50 gram of powders to pass the orifice of a hall flow meter funnel.Operator can also use other suitable device,however it has to measure to the nearest 0.1 second.

12. What is the function of a Base in apparatus of hall flow meter(funnel)?
-When we determine the flow rate of metal powders we need a Base, it is used to support the powder flowmeter stand.It should be a level,vibration free base in order to secure the test accuracy.

11. What is the function of a Stand in apparatus of hall flow meter(funnel)?
-When we determine the flow rate of metal powders we need a Stand,it is used to support the powder flowmeter funnel.

10. What is the relation between dimension of hall flowmeter funnel and Chinese Emery?
-The dimension shown in ASTM B213 for the flowmeter funnel including the orifice, are not to be considered controlling factors. Calibration with emery, as specified in ASTM B213 determines the working flow rate of the funnel.

9. What is the key apparatus being used in standard test method for flow rate of metal powders?
- Powder flowmeter funnel is the key apparatus in such method. It is a flowmeter funnel featuring an orifice at bottom. Such orifice is not ready after drilling, the manufacturer has to calibrate it in diameter.The diameter is 0.10 inches, i.e. approximately 2.54mm.

8. What is the significance and use of an Hall Flowmeter/Flow Meter Funnel?
-The standard test method for flow rate of metal powders may be part of the purchase agreement between powder manufacturers and powder metallurgy (P/M) part producer, or it can be an internal quality control test by either the producer or the end user.

7. Hall Flow Meter Funnel-What factor influence Flow Rate?
-Hall Flowmeter(Funnel) determines the flow rate of metal powders in powder metallurgy and other industries.
-Among all the factors which influence the metal powder flow rate the humidity and moisture content influence flow rate considerably.
-Wet or moist powders may not flow.

6. Hall Flow Meter (Funnel) Interparticle Friction by ASTM B213?
- Hall Flow Meter-The ability of a (metal) powder to flow is a function of interparticle friction. As interparticle friction increases, flow is slowed. Fine powders may not flow.

5. What is the significance and use of flow properties 1/4?
-Flow properties determine the rate and uniformity of die cavity filling, therefore determine the production rates and uniformity of compacted parts.

4. The scope of ISO 4490 about Hall Flowmeter/Hall Flow Meter
-The International Standard specifies a method for determining the flow rate of metallic powders, including powders for hardmetals, by means of a calibrated funnel (Hall Flowmeter).
-The method is applicable only to powders which flow freely through the specified test orifice.

3. The scope of ASTM B213 about Hall Flowmeter/Hall Flow Meter
-This test method covers the determination of the flow rate of metal powders and is suitable only for those powders that will flow unaided through the specified apparatus.
-The values stated in SI units are to be regarded as the standard (except for the flowmeter funnel, which is fabricated in inch-pound units). The values given in parentheses are for information only.
-This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate saftety and health practices and determine the applicability of regulatory limitations prior to use.

2. Principle of Hall Flow determination according to international standard ISO 4490 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
-Measurement of the time required for 50 g of a metallic powder to flow through the orifice of a calibrated funnel of standardized dimensions.

1. Apparatus of Hall Flowmeter/Hall Flow Meter according to International Standard ISO 4490 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
-Calibrated funnel
-Calibrated funnel has standard dimensions as per ISO 4490. The funnel shall be made of a non-magnetic, corrosion-resistant metallic material having sufficient wall thickness and hardness to withstand distortion and excessive wear.

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