| 摘要 |
PROBLEM TO BE SOLVED: To raise measurement performance of a calorific power value of natural gas.SOLUTION: Peak height PHmeas when measurement frequencies of the peak height PHmeas reaches a predetermined frequency N is considered as basic peak height PHbase. Difference between the basic peak height PHbase and the peak height PHmeas measured this time is calculated as &Dgr;PH (S201) and compared with a threshold PHth (S203). When &Dgr;PH is a threshold PHth or less (YES in S203), a correction value of the peak height PHmeas is calculated by using PHcalc=(1-α)×PHbase+α×PHmeas (S204), and the PHcalc is output as PHout (S205, S206), and when &Dgr;PH becomes larger than the threshold PHth (NO in S203), the peak height PHmeas used for calculation of &Dgr;PH is considered as new basic peak height PHbase (S207), PHmeas is output as PHout (S208), and a similar operation is repeated. |
