INTRINSICALLY SAFE EXPLOSION-PROOF SENSOR CIRCUIT
    2.
    发明公开
    INTRINSICALLY SAFE EXPLOSION-PROOF SENSOR CIRCUIT 有权
    INTRINSISCH SICHERE EXPLOSIONSSICHERS SENSORSCHALTUN G

    公开(公告)号:EP1403832A4

    公开(公告)日:2004-07-28

    申请号:EP01947842

    申请日:2001-07-04

    申请人: YAMATAKE CORP

    IPC分类号: H02H9/00 G08C19/00

    CPC分类号: H02H9/008

    摘要: An intrinsically safe explosion−proof sensor circuit is realized through a simple system. An intrinsically safe explosion−proof sensor signal processing circuit is characterized by comprising a sensor section for measuring a physical quantity of an object disposed in a dangerous place and a safety keeping circuit disposed in an explosion−proof case in a no dangerous or a dangerous place and provided with driving and feedback operational amplifier circuits and a current limiting resistor connected in series with each signal line connected with the sensor section and with the output terminal and the negative input terminal of the corresponding operational amplifier. Alternatively, the explosion−proof sensor signal processing circuit is characterized in that blocking capacitors are employed in place of the current limiting resistor.