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Air permeability 37SC

Determination of air permeability of fabrics in finishing, production and laboratory

UNI EN ISO 9237, EN ISO 9073 - 15, ISO 48, ISO 139, ISO 10012-1, ASTM D-737, JIS L 1096 A, DIN 53887, EDANA 140.1, GOST 12088 - 77, ASTM D-3574, TAPPI T-251, AFNOR G-07 111 - ASTM D737 - BS 5636 - DIN 53887 - EDA NA 140.1 - GB T 5453 - WSP 070.



Air permeability tester for fabrics
0..1000 Pa
0..2500 Pa
Taratura strumento / Calibration
Manutenzione - Servicing
Stampante - ASCII printer
Software BAP_04 : Statistical Analyses
Parti di ricambio - Spare parts

Air permeability 37SC is the state of art of Branca air permeability testers

The apparel represents the upgraded version designed by Branca Idealair on Air permeability testers, suitable to analyse the air permeability on textile materials, of garments, various clothing and industrial fabrics, technical textiles, downproof materials, wovens, nonwovens, filters, felts and other materials permeable to the air.

The AIR PERMEABILITY 37SC is designed for fabric testing in production, as for example finishing areas or QC processing.

Air permeability 37SC follows the Standard UNI EN ISO 9237: 97, where the air permeability of a fabric is defined as the air speed of an air volume to pass perpendicularly across a specimen under examination with a defined test area (cm2), pressure drop (0,1 Pa) and test time (0,1 s).

Composed of a floor-standing structure with wheels to make it moving easily inside working areas, the Air permeability 37SC allows the operator to analyse the air permeability in multiple points of the materials saving measurements quickly obtaining a fully-detailed report.

The test method allows the operator to verify the uniform surfaces of material, thus its validation; the test performances are controlled by the operator across an improved management in terms of operator interface across processing and configuration steps for laboratory and production improved also by an higher level of quality to final products by Branca Idealair R&D.

The Standard method is implemented, as per the model 37S, wherein the purpose is to evaluate the time needed for a fixed air volume to cross perpendicularly the sample under examination measured through a precision volumetric counter, and subjected to a fine pressure drop control (e.g.: at 200 Pa ).

The suction is generated by an ultra-silent vacuum unit self-cooled and installed directly inside the AIR PERMEABILITY 37SC; the acoustic pressure level ponderate "A" around the apparel is extremely low, less than 40 db.

Although the standard method is ideal for all fabrics with medium/high ranges of air permeability it is not rapid for the analysis of Low air permeability (0,01>X>10 L/min) then Branca Idealair develops a facility for low-permeability materials, called "QUICK CHECK", a new procedure that allows the operator to get the result of air permeability just after few seconds.

Thanks to its improved technology now it's possible to get results of air permeability on real time.

As per the previous models the instrument has to be controlled periodically with its calibration template supplied together with apparel itself.

The sample has to be fixed tightly between the flanges of the test area equipped with special flexible seals with 3 mm of width to prevent any air leakages from the side and avoiding distortions of the material itself during fixing operations. The blocking system can be manual with handle or electro-mechanical commanded from a switch on control panel.

The regulation of pressure drop (0,1 Pa) can be MANUAL or AUTOMATIC

Click here to ASK a quotation for the revamping from manual to automatic regulation.

The AIR PERMEABILITY 37SC is equipped with lateral side wings easy to turn of 90 suitable to sustain samples and meshes for an easy sliding of the same during the test to check its uniformity.

For test samples from 1 cm up to higher thickness, the AIR PERMEABILITY 37SC includes an appropriate auxiliary ring closure to exclude any affecting air leakages.

As anticipated per model 37S, Calibration template or primary sample for periodical analyses under calibration (also called AUTOCAL) is supplied together to check the correct reading and compared with the one shown on template label; the instrument reading mustn't overcome the maximum permitted error admitted MPE (%) as required by the Standard UNI EN ISO 9237:1997.

Air permeability calibration

Test area reduction flanges are adopted together with the instrument and used in relation to the individual features of the samples to be tested; on request the test area of 38 cm2 is commonly employed in test performances at a pressure drop of 125 Pa according to the Standard ASTM D-737.

E.g.: Test with calibration check template;

Through the HMI 5" Touch Screen the user can configure parameters setting and view test monitoring:

Original test area:100 cm2
Test area reduction flanges: 50, 20, 10, 5, 2 cm2
Pressure drop accuracy: 0..900 +/- 0,1 Pa; 0..2500 +/- 0,1 Pa;
Pressure drop regulation: Manual Automatic
Test results: Lt/min, Lt/h, m/s, Lt/m2/s (or mm/s), Others


1) ASCII Printer: once the test is finished, the user can print the test results on paper report thanks to auxiliary ASCII printer (available in both impact or thermal models). Inside the test listing report are shown the following information:
  • Company
  • Address
  • Operator
  • Sample No.
  • Supplier
  • Ambient Temperature ( C)
  • Ambient R.H.(%)
  • Additional notes
  • Test results expressed in the selected measure units Lt/min, Lt/m2/s, m/s, etc.
  • Operator signature

2) SOFTWARE for Statistical Analysis BAP04: add-ins software with data logging and remote control functions and statistical calculations of test results through Microsoft Office Excel compatible all versions 1997, 2000, 2003, 2008, 2013 , etc.
  • Easy programming in Excel
    • The user can set all parameters from a Local-PC configuring cells as monitoring and setting of the machine in the Excel Workfile communicating and sending command and information thorugh a bidirectional communication of the instrument;

  • Data storage and automatic saving to a destination folder named as "ARCHIVE"
  • Flexibility
  • Automatic Macro Start-up Start
    • The macro recorded by the user when the program is active

  • CHARACTER CHANGE: signaling change of On/Off conditions
  • OPERATION FORMULA: automatic calculation through math formulas set by the operator for each cell;
mm/s (Lt/m2/s);

[AIRFLOW SPEED] (full range): da 1,4 mm/s a 8056 mm/s;
* FYI: availability to speed up test thanks to the function control "QUICK CHECK";

[TEST AREA] (cm2):

TEST AREAMIN (Lt/m2/s)MAX (Lt/m2/s)
100 cm2 1,4 161 (Original)
50 cm2 2,8322 (Reductions)
38 cm23,7424 (ASTM D-737)
20 cm26,9806 (Reductions)
10 cm213,91611 (Reductions)
5 cm2 27,83222 (Reductions)
2 cm269,4 8056 (Reductions)

RANGE PRESSURE DROP 10 - 900 Pa (0-90 mm.Wg)
RANGE PRESSURE DROP 2 0 - 2500 Pa (0-250 mm.Wg)

  • 100 cm2
  • 200 cm2

  • 50 cm2;
  • 20 cm2;
  • 10 cm2;
  • 5 cm2;
  • 2 cm2;


Minimum airflow: 50 Lt/h (equal to 0,84 Lt/min)
Maximum airflow: 5800 Lt/h (equal to 96,6 Lt/min)
Test air volume: 10 Lt /100 Lt
Maximum permitted error (MPE): 3% (according to UNI Standard)
Power supply: 110/230VAC - 50/60 Hz
Dimensions (LxDxH): 430 x 500 x 620 mm
Net weight: 70 kg

  • ASCII Printer 57,5 mm, 24 columns with USB slot;
  • Sleeve of 100 cm2 to avoid air sides passage for thicker samples;
  • Dedicated reduction flanges of 50 cm2 for special samples;
  • Reduction flanges of 38 cm2 according to the norm ASTM D-737;
  • Air permeabilty 37SC with manual control
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