| 摘要 |
PURPOSE: A flow rate measuring algorithm of a digital measuring device using an MF sensor is provided to reduce noise caused by the mechanical rotation of instruments and to enhance measurement accuracy by sensing magnetic field changes caused by external influence. CONSTITUTION: A flow rate measuring algorithm of a digital measuring device using an MF sensor comprises next steps. Analog signals are output by sensing a magnet moving along a flow of fluid by using the MF sensor(S1). The output analog signals are converted into digital signals. The analog signals include a first output voltage and a second output voltage in the sensing step. The digital signals include first and second pulse signals in the conversion step. [Reference numerals] (AA) Start; (BB) End; (S1) Detecting by a sensor (P00); (S11) Current value(P00) is equal to first and second pulses of the second previous value(P02)?; (S13) Confirming the occurrence of chattering; (S15) First pulse signal of the current value(P00) is identical to a first pulse signal of the previous value(P01) and a second pulse signal of the current value(P00) is different from a second pulse signal of the previous value(P01)?; (S17,S23) First and second signals of the previous value(P01) are identical?; (S19) Forward rotation; (S21) Flow rate + integration; (S25) Reverse rotation; (S27) Flow rate - integration; (S3) Both the first and second pulse signals of the current value(P00) are different from both the first and second pulse signals of the previous value(P01)?; (S5) Confirming the influences of an external magnetic field; (S7) Both the first and second pulse signals of the current value(P00) are identical to both the first and second pulse signals of the previous value(P01)?; (S9) No rotation of a magnet
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