Test systems

Nor1517

Airflow resistance measurement system

The Nor1517A airflow resistance measurement system determines the airflow resistance in porous materials according with ISO 9053-2:2020.

Applications

Quality control in production process.
Testing in research and development

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Airflow tesistance and acoustic performance

Airflow resistance is one of the key parameters for characterising porous materials and is closely linked to their acoustic performance. Low airflow resistance indicates that air passes easily through the material, while high airflow resistance means the structure is closer to airtight.

Standards-compliant measurement in sccordance with ISO 9053‑2

Nor1517A determines the specific airflow resistance – and related quantities – using the alternating airflow method in accordance with ISO 9053‑2:2020 “Acoustics – Determination of airflow resistance – Part 2: Alternating airflow method”.

Dynamic measurement principle

The system is based on a dynamic principle. An AC motor–driven piston generates an oscillating movement that produces a 2 Hz alternating airflow into a cylindrical tank and through the test specimen. The resulting pressure modulation inside the cylinder is measured by a condenser microphone and analysed with a sound analyser using the 2 Hz 1/3‑octave band on the Nor140 sound level meter.

Direct calculation and traceable documentation

Specific airflow resistivity is then calculated either in an Excel template or read directly from the meter in Pa·s/m. Measurement results can be stored in the instrument memory for traceable documentation and later analysis.

Features

Specifications

Accessories

Downloads

Features

Fast and accurate measurement and readout of measurement results.
Accepts test material of various form & size.
Easy setup & use.
Large dynamic range of measurement.
Measures at 2 Hz.
Standard: ISO 9053-2:2020.
Airflow resistance: 0.5 cm/s and 0.05 cm/s.
Max. diameter of test pieces: 100 mm.
120 dB measurement range.

Specifications

Measure the specific airflow resistance in Pa s m^-1 according to ISO 9053-2 (2020): Acoustics – Determination of airflow resistance – Part 2: Alternating airflow method. Related quantities as airflow resistance and airflow resistivity may also be measured.

Measurement range: 10 Pa s m^-1 to 30 000 Pa s m^-1, up to 100 000 Pa s m^-1 when correcting for non-linearities.

Airflow speed: 1.6 mm/s and 5 mm/s (r.m.s.) selected by the stroke 4.46 mm (Cal) or 14 mm (Meas)

Diameter of test area: 100 mm
Power supply: 230 V/50 Hz (or 110 V/60 Hz – option US)

Overall dimension (W×D×H): 590 mm × 290 mm × 640 mm

Weight: 19 kg

Accessories

Accessories included

Calibration disc
Sample holder Nor1517A/01
Measurement tube; sample holder 200 mm.
Sound level meter Nor140 with microphone, sealing device and 1/3 octave filters, option for high measurement range
Mains cable
Hex key 6 mm
Instruction manual
Excel sheet (see downloads)