| 摘要 |
<p>PURPOSE:To prevent the deterioration of calibration accuracy or the uncalibratability caused by a setting miss of a calibration range, and to execute the measurement with high accuracy by constituting the device so that an optimal range at the time of calibration can be selected automatically by interlocking with concentration setting of calibration gas. CONSTITUTION:The zero point adjustment is executed by leading zero gas into an analyzing part 3, and thereafter, concentration of calibration gas K of a gas cylinder 1 is inputted to a microcomputer (micon) 7 by a keyboard 8, etc., and by data processing, an optimal range of a correction range 4 is judged, and by a prescribed signal, the range 4 being suitable for calibration gas concentration is selected. In this case, the range is selected automatically so that a span calibration can always be executed with the maximum sensitivity, for instance, a 5ppm range and a 20ppm range are selected at the time when concentration of the gas K is 4ppm, and at the time when it is 18ppm, respectively. Subsequently, from the cylinder 1, the gas K is led into the analyzing part 3, an operation is executed by the microcomputer 7 so that a displayed 10 detecting signal becomes a value corresponding to concentration of the gas K inputted in advance to the microcomputer 7, and the span calibration is executed automatically.</p> |
