METHOD FOR MEASURING CONCENTRATION OF OXYGEN,申请号JP19850123251-传众专利搜索

METHOD FOR MEASURING CONCENTRATION OF OXYGEN

申请公布号：JPS61280560(A)

申请号：JP19850123251

申请日期：1985.06.06

申请公布日期：1986.12.11

申请人：

FUJIKURA LTD

发明人：NAKAZAWA MITSUHIRO;TAKAGI TSUTOMU;ISONO YOSHIYA

分类号：G01N27/41

主分类号：G01N27/41

摘要：PURPOSE:To enable the measurement of concn. with high accuracy, by varying the monitor voltage of a limit current type oxygen sensor corresponding to the concn. of oxygen. CONSTITUTION:The internal resistor Rs of a limit current type oxygen sensor S is substantially the resistor of an oxygen ion conductive plate and variable by the concn. of oxygen to be measured and voltage to be applied. A resistor R7 converts a limit current to a voltage value to allow said voltage value to be fed back to an initial stage OP amplifier 10 through an OP amplifier 11. Further, reference voltage is determined by a variable voltage source 5 and a constant voltage diode D. When the concn. of oxgen is high, the output of the amplifier 10 becomes large and high monitor voltage is set. Contrarily, when the concn. of oxygen is low, low monitor voltage is set. Therefore, optimum monitor voltage corresponding to the concn. of oxygen in gas to be measured is automatically applied and the concn. oxygen can be measured with high accuracy.