are known to change their flow characteristics with repeated use in the field and with repeated analysis. The TurboMatrix 650 ATD offers a chance to actually measure and record the impedance of all the tubes held in stock at HSL which can then be re-assessed as part of a quality-management system. An example of the variation in tube impedance is given in Figure 3 and the impact on sampling flow rates in an uncontrolled system is shown in Figure 4.
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