| 摘要 |
<p>An air or gas sampling device utilises a small tube (8) calibrated under isothermal conditions. The relationship of pressure at the input end of the tube to flow is plotted and stored in a microprocessor for comparison with pressure monitored during sample pumping. Pulsations in flow caused by the air or gas pump (2) can be neutralised by a damper (9) comprising a small chamber having a diaphragm (6) for one wall.</p> |
