Misuratore di portata Hall
Misuratore di portata Carney
Imbuto per misuratore di portata Hall
Imbuto per misuratore di portata Carney
Misuratore di portata Hall con imbuto in acciaio inossidabile
Misuratore di portata Hall con imbuto in ottone
ASTM B212 ASTM B213 ASTM B417
ASTM B964, ISO 3923, ISO 4490, ISO 14629
MPIF n. 3 MPIF n. 4 MPIF n. 28

Hall Flowmeter ASTM B212 & ASTM B213 - Flow Rate & Apparent Density Analysis:

These two ASTM standards define complementary methods for evaluating the flow characteristics e densità apparente of metallic powders.

• ASTM B212 misura il flow rate of a powder through a standardized funnel.

• ASTM B213 determina il densità apparente of the same powder using the same funnel geometry and a calibrated receiving cup.

Together, they provide a reproducible assessment of powder flowability, packing behavior, and consistency for powder metallurgy applications.

Apparecchio

• QPI‑HFM1800 Hall Flowmeter Kit, manufactured in accordance with ASTM B212 and ASTM B213 specifications:

  • Hall funnel: precision‑machined brass or stainless‑steel funnel with a 2.5 mm orifice e 60° cone angle, conforming to ASTM dimensional tolerances.

  • Stand assembly: rigid vertical support ensuring perfect alignment between funnel and receiving cup.

  • Receiving cup: cylindrical container with a 25 cm³ internal volume, calibrated for density determination.

  • Base platform: adjustable leveling feet for horizontal setup.

  • Stopwatch: resolution ± 0.1 s for timing flow rate.

  • Analytical balance: resolution ± 0.01 g for weighing samples.

ASTM B212 – Flow Rate Determination

Principio

A known mass of powder is allowed to flow freely through the Hall funnel under gravity. The time required for the entire sample to discharge is recorded. The result expresses the powder’s flow rate in seconds per 50 g oppure seconds per 100 g, depending on the material type.

Procedura

1. Preparation:

   • Ensure the funnel and cup are clean and dry.

   • Level the apparatus using the adjustable feet.

   • Verify the funnel orifice is unobstructed.

2. Sample Loading:

   • Close the funnel outlet using the supplied shutter.

   • Pour the powder into the funnel until it reaches the top edge.

   • Level the surface gently without compacting.

3. Flow Test:

   • Remove the shutter and start the stopwatch simultaneously.

   • Allow the powder to discharge completely under gravity.

   • Stop timing when the last particle exits the funnel.

4. Result Reporting:

   • Record the elapsed time as the flow rate.

   • If the powder does not flow freely, report “No Flow” as per ASTM B212.

ASTM B213 – Apparent Density Determination

Principio

A powder sample is allowed to flow through the same Hall funnel into a calibrated cup. The mass of powder occupying the known volume is measured to determine its densità apparente.

Procedura

1. Preparation:

   • Confirm the funnel and cup are clean and aligned vertically.

   • Level the apparatus.

2. Sample Loading:

   • Close the funnel outlet.

   • Fill the funnel with powder to the top edge.

   • Avoid vibration or compaction.

3. Flow and Filling:

   • Remove the shutter to allow powder to discharge freely into the cup.

   • When flow stops, strike off excess powder flush with the rim using a straight edge.

4. Weighing and Calculation:

   • Weigh the filled cup to the nearest 0.01 g.

   • Subtract the mass of the empty cup to obtain the net sample mass.

   • Calculate apparent density:

5. Ripetibilità:

   • Perform at least three measurements.

   • The variation between results should not exceed ± 1 %.

Engineering Notes

• ASTM B212 and B213 are fundamental tests for powder metallurgy, additive manufacturing feedstocks, e metallic powder quality control.

• The QPI‑HFM1800’s precision funnel geometry ensures consistent discharge and reproducible results.

• Cleaning between tests prevents contamination and maintains dimensional accuracy.

• The instrument’s brass or stainless‑steel construction provides long‑term stability and corrosion resistance.

Interpretation of Results

• Flow rate (ASTM B212) reflects particle size, shape, and surface friction.

• Apparent density (ASTM B213) indicates packing efficiency and porosity.

• Together, they help engineers evaluate powder suitability for pressing, sintering, and additive manufacturing.