| 摘要 |
PURPOSE:To reduce the consumption of correction gas by shortening a correction time, by performing correction by calculating time when the indication of a chemoluminescent type gas analyser is considered to have been stabilized. CONSTITUTION:A detection part 5 detects the concn. of correction gas to take the same in CPU7. The detection signal of this correction gas rises at a point t0 after changing-over and changes with primary delay and reaches a final value K before long. When t=T1 is formed after said signal rised at the point t0, a signal level (x) is detected and change amount DELTAx1 is calculated. When t=T2 is formed, a change amount DELTAx2 is calculated. The difference values DELTAx1, DELTAx2 are substituted for a primary delay response formula to stepping input to calculate a time constant T. When this time constant T is multiplied by a constant (n) and t=nT is formed, the signal value xnT at this point of time is set as the concn. of the correction gas to perform correction and span correction is carried out to finish automatic correction. The constant (n) is preliminarily selected to a value wherein the signal value xxT is regarded as the final value K at the time nT elapsed from the rising time. By this method, a gas collection time is shortenened to a large extent. |
