| 摘要 |
<p>A laboratory filtration apparatus is described in which flow through the filter is measured as the filter is being used and then visually displaying an indication of the measured flow which is used to indicate the effectiveness of the filter. In one arrangement air and water are filtered using separate filters (24, 36) and the effectiveness of the filter is monitored by using flowmeters (28, 30) coupled to microprocessor-based control systems (34) and the output of the microprocessor-based control system is coupled to a visual display unit (32) which gives separate visual indication of the effectiveness of air and the water filter.</p> |
