| 摘要 |
<p>A continuous analyser comprises a spectrometer (2), suitably an NIR spectrometer, and a computer for automatic data processing, for operation in a classified safety area. The spectrometer (2), the central processing unit (3) of the computer, the video monitor (4) and the keyboard are enclosed in a leakproof pressurised cabinet (1) which also contains an air conditioner (9), the condenser (10) of which is located outside the cabinet (1). Purging of the atmosphere initally contained in the cabinet (1), the pressurisation of the cabinet (1) and the subsequent maintenance of this pressure are controlled by a pneumatic logic controller (13). This operates a purging phase during which the pneumatic logic controller (13) checks the escape of the minimum flow through an output module (16) for a specific time before permitting connection of the electrical equipment (2,3,4). This is followed by a pressure maintenance phase during which a desired pressure is maintained inside the cabinet (1) without appreciable escape through the output module (16).</p> |
