AB Lorentzen & Wettre Hava Geçirgenliği Test Cihazı

AB Lorentzen & Wettre Hava Geçirgenliği Test Cihazı

L&W Air Permeance Tester uses the latest technology to measure air permeance in accordance with the most common measuring methods. It is a single instrument with a measuring range covering 0.003–100 µm/Pa s, which makes it suitable for most paper grades.

L&W Air Permeance Tester is a fully integrated instrument, with compact design to be as convenient as possible to use. Once the measuring sequence has been set the operator simply places the paper sample in the measuring gap. Then a sensor detects the paper and the measuring process starts. The paper is automatically clamped in position with a clamping pressure of 1 MPa, and readings are taken according to the preset measuring time. Then the clamp opens and a new sample can be measured.

The results are shown in the selected unit of measurement, on the display and printed out on the built-in printer. Results can also be sent to a PC via the signal output.


Excellent precision

The traceable calibration of the pressure transmitter and flow meter ensures a very high level of reproducibility. The easy check functions of the instrument, guarantees fast and reliable routine measurements with the highest possible precision. Not to forget, L&W Air Permeance Tester is truly environmentally friendly, as the use of mercury and oil has been eliminated.

Automatic clamping

Manual methods of measuring air permeance can be slow and laborious, but with L&W Air Permeance Tester measuring is automatic and fast, thereby guaranteeing correct measurements. Errors and poor reproducibility, which can be caused by differences in instrument handling, are effectively prevented. The preset measuring time is usually
5 seconds for all kinds of samples, thereby saving considerable time when measuring paper grades with low levels of air permeance.

  • Four different units of measurement
  • Compact design
  • Automatic clamping of sample
  • Preset measuring time
  • Fast and simple
  • Superior precision

L&W Air Permeance Tester – Code 166
Two check nozzles. PC software for setup and calibration. Spare base diaphragm. Serial cable. Printer rolls



0.003–100 µm/Pa s appr. corresponding to
2–40000 Gurley seconds (100 cm³)
0.3–8800 Bendtsen ml/min
0.2–1400 Sheffield units


Display and printer
 5 digits, up to 3 significant digits reported
Delay time
Adjustable 2–10 s
Contact pressure
1 MPa
Test air pressure
20 kPa (2.9 psi)
Test area
50 cm²


 Measurement values
- air permeance
- mean value
- standard deviation
- coefficient of variation
- maximum and minimum values of the series



- connectable to L&W Autoline Data Acquisition Workstation


Installation requirements

55 W
Instrument air
>0.4 MPa (60 psi)
Air consumption
 0.2 m³/h (0.1 ft³/min) NTP



0.3 × 0.4 × 0.4 m
12 × 16 × 16 in


0.2 m³
7.4 ft³

Net weight

21 kg
46 lb

Gross weight

30 kg
66 lb


Related standards
APPITA 1301.440, APPITA 1301.420, DIN 53 120, ISO 5636/3, ISO 5636/4, ISO 5636/5, ISO 11 004, NF Q03-076, NF Q03-078, SCAN P26, SCAN P53, SCAN P60, SCAN P85, TAPPI T460, TAPPI T547  

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