| 摘要 |
PURPOSE:To take an accurate measurement by calculating a flow rate from the mean value of stored time intervals when a measured time interval is shorter than a specific value or from the mean value of the measured time interval when longer. CONSTITUTION:A reed switch 3 transmits a flow rate pulse every time a meterz measures unit measurement volume. Time intervals of flow rate pulses are measured by a timer 5, whose measurement results are inputted to an arithmetic processing part 6 to calculate the flow rate per unit time. When the flow-rate pulse interval is shorter than the specific time, the mean of a specific number of the past measurement results is calculated and the flow rate per unit time is calculated from the mean value. When the flow rate pulse interval is longer than the specific time, the flow rate per unit time is calculated from the current measured time interval or the mean value of the current and last measured time intervals. Consequently, the flow-rate pulses synchronize with the measurement time completely, so the flow rate per unit time is measured accurately. |
