PURPOSE: To measure the flow rate quickly and accurately even after it changes by a method wherein pulses from a flow rate sensor are counted to measure and memorize the time interval thereof and when the current and previous time intervals satisfy a specified relationship, the measurement is stopped to start a new measurement.
CONSTITUTION: A flow rate sensor 2 is provided in a gas supply line 1 and is made up of a membrane type gas meter 3 and a lead switch 4 as magnetic field sensor to transmit a flow rate pulse F each time a specified unit weighing volume is measured. The pulse F is inputted into an arithmetic processor 5 which computes the flow rate per unit time. The device 5 is equipped with a counter 6 for counting the pulse F, a timer for measuring the time interval of the pulse F, a memory 9 for memorizing the time interval of the pulse F measured one time ago and an arithmetic processing section 8. The processing section 8 computes the flow rate per unit time while stopping the measurement to start a new measurement when the time intervals measured currently and previously satisfy the specified relationship. Thus, the flow rate can be measured quickly and accurately even after it is changed.
SAKA TATSUO
SHIRASAWA TADANORI
OKAMOTO MASAYUKI
| JPS54108654A | 1979-08-25 | |||
| JPS57520A | 1982-01-05 |