METHOD FOR CALIBRATING SULFUR DIOXIDE MEASURING DEVICE FOR ENVIRONMENTAL ATMOSPHERE

摘要

PROBLEM TO BE SOLVED: To shorten a time necessary for the calibration of a sulfur dioxide measuring device for an environmental atmosphere. ;SOLUTION: Span gas is introduced from a calibration gas entrance 11 to a sulfur dioxide measuring device 9, and the flow of gas is introduced from a valve 16 to a zero gas purification passage 17, and supplied to a detecting part 21 as zero gas by extracting sulfur dioxide by a zero gas purifier 19, and zero calibration is operated when the indication of the detecting part 21 is made stable. Next, the flow of gas is switched by the valve 16 for allowing the span gas to directly flow to the detecting part 21, and the span calibration is operated when the indication of the detecting part 21 is made stable.;COPYRIGHT: (C)1998,JPO