The High Flow Resistance Meter (HF SIGMA) is designed to provide reliable measurement of resistivity, resistance, standard resistance and permeability to airflow as a function of flow velocity for a wide range of open cell materials used for noise control.

The flow velocity ranges from 10 cm / s up to 280 cm / s for a 100 mm diameter sample (the speed depends on the atmospheric conditions) and the measured pressure loss can go up to 17 kPa.

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Measured Properties in Function of Flow Velocity

1.  Pressure drop (Pa)

2.  Airflow resistance (Pa.s/m or rayls)

3.  Normalized airflow resistance (normalized by air characteristic acoustic impedance)

4.  Airflow resistivity (Pa.s/m² or rayls/m)

5.  Viscous permeability (m² or Darcy)

 

Applications

Mecanum’s high airflow resistance meter is used by the world’s leading material suppliers for both automotive and aircraft industry for quality control in the manufacturing process of materials; research, development, and innovation, and for feeding acoustical prediction software dealing with sound absorbing materials, perforated plate, fabrics for a high sound pressure level application.

Features

 

The system includes:

  • Two specimen holders* (100-mm and 44.44-mm diameter) 

        *other sizes available

  • Thin film holder

  • Certified calibrated resistance

  • Grids to support limp material

  • Rings to minimize airflow leaks around the sample

  • SIGMA-X software

The SIGMA-X software fully controls the measurement and calculates the main properties and statistics related to the measurement. It corrects pressure and temperature. The system works with disc shaped samples.

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Main interface

Main Advantages of the Product

 
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Measuring sequence controlled and guided through a user-friendly interface

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