Kalbrierung of smallest pressures in the wind tunnel

The today usual mechanisms for the representation of small pressures are based on the principle of a kolbenmanometers or a sealing cone. With these procedures small pressures can be represented starting from 1 Pa reproducibly. The messunsicherheit amounts to +/- the PTB for some time looks for 0.3 Pa for a more exact procedure for the representation of small pressures, in order to become fair the requirements of the industry. One of the substantial demands for pure areas is that the positive pressure to the ambient pressure approx.. 15 Pa amounts to. Around these pressure values to guarantee most exact measuring instruments are necessary. The used measuring instruments must be examined regularly in the area of application between 1 and 20 Pa. There however an uncertainty of 0,3 Pa with itself are only conditionally suitable they bring the calibration with the past calibration methods for the calibration of the measuring instruments used in the pure area.With a new, patented measuring procedure in the wind tunnel Testo can become fair industrial services the demands of the ISO 14644 or VDI 2083. These standards must be kept in the producing industry, e.g. Pharma, biotechnology and electro-technology and be fulfilled with start-up of the pure areas by the manufacturers. With the help of this calibration procedure gauges within a range can be kalbriert smaller than 20 Pa DKD pressure starting from 0,1 Pa to be reproducibly represented there can. Besides the smallest definable messunsicherheit is appropriate in the range for smaller 20 Pa with +/- 0.02 Pa under that of the past procedures... far information find you clearly in the pdf document