Roughness and Air Permeability
To determine the roughness and the air permeability according to the Bendtsen method, Gurley porosity is calculated from the measured values.
The specially developed robust aluminum housing, which is equipped with a user-friendly touch screen, provides an excellent basis for the high-precision measuring mechanics of the Bendtsen. It consists of up to two pneumatic measuring cylinders with corresponding measuring heads, the control circuits and precise measuring sensors. To save the touch screen, the start button, which is separately attached to the device, can be used instead of the start button. The flow rate is 25-5000 ml/min. Other flow ranges are available on request.
simple & intuitive operation via touchscreen
fully automatic measuring process
up to two measuring heads: roughness and air permeability
statistic with graphs, max, min, mean, standard deviation
photocell detection of the sample, automatic start of measurement
automatic compensation of atmospheric pressure
high quality acrylic specimen alignment holder
calculation of the Gurley values in seconds (only for porosity measurement models)
Windows based software
RS232 and USB port
ISO 5636, 8791; TAPPI UM535; SCAN P21, P60
|test pressure selectable acc. to standard
|0.74 kPa, 1.47 kPa, 2.20 kPa
|stabilizing time selectable
|1 – 40 sec.
|1 head Bendtsen Tester for roughness tests
|1 head Bendtsen Tester for air permeability tests
(with Gurley calculation)
|2 head Bendtsen Tester for roughness and air permeability tests (with Gurley calculation)