WATCH THE DIFFERANCE

AIR PERMEABILITY-TESTER

                                                                                      Function:

 

The instrument contains a powerful, muffled suction pump drawing air through an interchangeable test head with a circular opening. For measurement, the test head appropriate for the selected test standard is mounted to the instrument. The test specimen is placed over the test head opening and after simultaneously pushing two start buttons, it is clamped with high force by a pneumatic clamping system. This high clamping force practically eliminates the lateral air flow. At the same time the suction pump is started. The pre-selected test pressure is automatically set and maintained, and after a few seconds the air permeability of the test specimen is digitally displayed in the pre-selected unit of measure. By pushing the two buttons a second time, the test specimen is released and the suction pump is shut-off.

Since the suction pump is automatically started when the test specimen is clamped in place over the test head opening, the test pressure builds up only after the test specimen has been clamped. This guarantees a perfect clamping of the test specimen and greatly facilitates the operation of the instrument.

The test pressure is digitally pre-selected in accordance with the respective test standard and is automatically controlled by the instrument. Due to a true differential measurement of the test pressure it is set accurately, even at high air flows.

The air flow through the test specimen is measured with a variable orifice. The air permeability of the test specimen is determined from the pressure drop across this orifice, and is digitally displayed in the selected unit of measure for direct reading.

High stability, precision electronic pressure sensors provide for an excellent measuring accuracy and reproducibility of the test results. The proper function and calibration of the instrument can be checked in a matter of seconds by means of a calibration check plate. The instrument can be calibrated and is supplied with an ISO conform calibration certificate.

The long, free area behind the test head (50 cm / 20") allows the operator to take measurements from large samples without having to cut small test specimens.

The instrument is not only suitable for laboratory use, but it is mobile and small enough to also be used directly in the production area. Operation of the instrument is extremely simple, so it can be operated without problem, even by inexperienced personnel.

The instrument is equipped with an RS 232 C data port.