发明名称 |
Electromagnetic flow meter |
摘要 |
An electromagnetic flow meter for measuring the flow rate of a fluid by applying to the fluid a magnetic field generated with an exciting current and measuring the resulting signal voltage generated at a pair of electrodes; wherein the exciting current comprises two frequency components which are lower and higher than the usual commercial frequency and the signal voltage comprises two frequencies which are discriminated so that a higher frequency is extracted as a first output and a lower frequency is extracted as a second output, through a low pass filter having a large time constant. A predetermined operation, such as addition, zero correction, response correction, etc, is carried out on the first and second outputs to produce a flow rate output. The invention has quick response, stable zero point and reduced susceptibility to noises.
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申请公布号 |
US4773274(A) |
申请公布日期 |
1988.09.27 |
申请号 |
US19870019882 |
申请日期 |
1987.02.27 |
申请人 |
YOKOGAWA ELECTRIC CORPORATION |
发明人 |
KOBAYASHI, TAMOTSU;KUROMORI, KENICHI;GOTO, SHIGERU;MATSUNAGA, YOSHINORI;TORIMARU, TAKASHI;SHIKUYA, NORIHIRO;AZEGAMI, TADASHI |
分类号 |
G01F1/60;(IPC1-7):G01F1/60 |
主分类号 |
G01F1/60 |
代理机构 |
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主权项 |
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地址 |
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