| 摘要 |
<p>A method for assaying dry gases comprising sulphur trioxide capable of forming a mist, and particularly to apparatus for monitoring and controlling gases discharged for process industries and combustion plants. The gas to be assayed is introduced into a closed space and contacted therein with air comprising normal humidity which reacts with the gas to form a mist, whereafter the light-extinction properties of the mist are measured. The apparatus for carrying out the method comprises a closed space (1) wherein there is arranged a light source (9) and a receiver (10) for receiving a beam of light emitted from said light source (9), said light beam being arranged to pass through said close space (1); an inlet line (5) for gas to be assayed; at least one inlet line (6) for at least one further gas; an outlet line (14) for removal of said gases, said outlet and inlet lines (5, 6, 14) being arranged in spaced apart relationship.</p> |
