| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily calibrate a pressure sensor to be used in a practical watering test. <P>SOLUTION: A zero-point pressure Pa detected by a terminal end pressure sensor 44 is measured in calibration while a remote three-way selector valve 42 is switched to a normal position. Further, the pressure detected by a master pressure sensor 38 is measured as a reference span pressure Pm by controlling an electric valve 40 to open, and the pressure detected by the terminal end pressure sensor 44 is measured as a span pressure Pb. Next, the measured reference span pressure Pm is converted into a conversion reference span pressure Pmo corresponding to the height of disposition of the terminal end pressure sensor 44, and a zero-point correction constant for calibrating the zero point of the terminal end pressure sensor 44 and a span correction coefficient for calibrating the span of the terminal end pressure sensor 44 to the conversion reference span Pmo of the master pressure sensor 38 are derived. After finishing the calibration, the pressure detected by the terminal end pressure sensor 44 is corrected based on the zero-point correction constant and the span correction coefficient. <P>COPYRIGHT: (C)2013,JPO&INPIT |
