Gas detection system and control method for gas detection system
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorAtsuo Nakao
Life of this patent
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Abstract
A gas detection system includes a gas sensor, and a filter unit. The gas sensor is configured to detect detection target molecules. The filter unit is disposed at a reference gas supply passage. The reference gas supply passage connects a reference gas inlet port from which a reference gas is introduced, and a sensor chamber in which the gas sensor is housed. The filter unit includes at least a first filter configured to reduce the detection target molecules in the reference gas, and a second filter configured to reduce moisture in the reference gas. Each of the first filter and the second filter has a separation membrane including hollow fibers.
Claims19
A gas detection system, comprising:
- a reference gas inlet port from which a reference gas is introduced, the reference gas being used as a reference to concentration of detection target molecules in a sample gas;
- a gas sensor configured to detect the detection target molecules;
- a sensor chamber in which the gas sensor is housed;
- a filter unit disposed at a reference gas supply passage connecting the reference gas inlet port and the sensor chamber;
- and
- a first sample gas discharge passage disposed to connect the sensor chamber and a gas outlet port for discharging at least the sample gas, wherein:
- the filter unit includes at least a first filter and a second filter, the first filter being configured to reduce the detection target molecules in the reference gas, and the second filter being configured to reduce moisture in the reference gas,
- each of the first filter and the second filter includes a separation membrane including hollow fibers, and
- the first sample gas discharge passage passes through the filter unit.
A control method for a gas detection system, the control method comprising:
- a reference gas supply processing including supplying a reference gas to a sensor chamber, in which a gas sensor is housed, through a filter unit including at least a first filter and a second filter;
- a moisture measuring processing including measuring an amount of moisture contained in the reference gas after passing through the filter unit;
- and
- a moisture adjustment processing including adjusting the amount of moisture of the reference gas to be supplied to the gas sensor through the filter unit based on a measuring result relating to the amount of moisture, wherein:
- the reference gas is used as a reference to concentration of detection target molecules in a sample gas,
- the first filter is configured to reduce the detection target molecules in the reference gas, and the second filter being configured to reduce moisture in the reference gas, and
- each of the first filter and the second filter includes a separation membrane including hollow fibers.
Dependencies are inferred from the claim text.