发明名称 |
Process and device for detecting oxidable and/or reducible gasses in air |
摘要 |
A device and method for detecting oxidizable and/or reducible gases in the air for controlling ventilation plants in buildings or motor vehicles and for monitoring combustion processes or waste gas analysis by a capacitance sensor that detects change in sensor capacities at two different frequencies. Alternating currents having at least two frequencies is passed through a heated sensor between contact electrodes of the sensor and a polycrystalline metal oxide sensor material and an evaluation circuit measures a change in capacitance between the electrodes and sensor material. A change in capacitance measured at a first frequency indicates the presence of reducible gases while a change in sensor capacitance at a second frequency indicates the presence of oxidizable gases. Variations in sensor ohmic resistance at the two frequencies are also considered. |
申请公布号 |
AU2774897(A) |
申请公布日期 |
1997.11.19 |
申请号 |
AU19970027748 |
申请日期 |
1997.04.29 |
申请人 |
ROSEMARIE BRAND-GERHART |
发明人 |
HANNS RUMP |
分类号 |
G01N27/12;B01D53/50;G01N27/02;G01N27/22;G01N33/00 |
主分类号 |
G01N27/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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