| 摘要 |
<p>The air filter has a casing with an air passage which connects at one end to a pressurised air source. At the air passage second end, it is connected to a low pressure region. A filter element is placed across the whole section of the air passage. Pressure detectors communicate with the passage between the first end and the filter element. The pressurised air is circulated by an air pump, the low pressure region forming the admission orifice of the air pump.</p> |
