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A probe for use in determining the amount of a first gas component in a combustion gas containing the first gas component and a second gas component which is obtainable from the first gas component by reduction or oxidation, the probe comprising: a first component probe for taking a first sample of

A probe for use in determining the amount of a first gas component in a combustion gas containing the first gas component and a second gas component which is obtainable from the first gas component by reduction or oxidation, the probe comprising: a first component probe for taking a first sample of the gas and converting the first gas component present in the first sample to the second gas component, the first component probe including a first passage for conveying the first sample, the wall of the first passage in contact with the first sample being made of a material that converts the first gas component to the second gas component; and a second component probe for taking a second sample of the gas, the second component probe including a second passage for conveying the second sample.

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1. A probe for determining the amount of a first gas component in a flow of combustion gas containing the first gas component and a second gas component which is obtainable from the first gas component by reduction, comprising: a first component probe configured to protrude into the flow of combusti

1. A probe for determining the amount of a first gas component in a flow of combustion gas containing the first gas component and a second gas component which is obtainable from the first gas component by reduction, comprising: a first component probe configured to protrude into the flow of combustion gas for taking a first sample of the combustion gas from the flow of combustion gas and converting the first gas component present in the first sample to the second gas component, the first component probe including: a first sample inlet configured for receiving the first sample of the combustion gas from within the flow of combustion gas; and including a first passage providing fluid communication for the first sample between the first sample inlet and a location outside the flow of combustion gas, the first passage defined by an inner wall of the first component probe of the first component probe, wherein at least within the flow of combustion gas the inner wall is in contact with the first sample and is made of a material that converts the first gas component to the second gas component; anda second component probe configured to protrude into the flow of combustion gas for taking a second sample of the combustion gas from the flow of combustion gas, the second component probe including: a second sample inlet configured for receiving the second sample of the combustion gas from within the flow of the combustion gas; and including a second passage providing fluid communication for the second sample between the second sample inlet and a location outside the flow of combustion gas, the second passage defined by an inner wall of the second component probe, the inner wall of the second component probe in contact with the second sample being made of a material that is inert as to the conversion of the first gas component to the second gas component, wherein the first passage and the second passage are discrete, the difference between the total amount of the second gas component present in the first sample following the conversion and the total amount of the second gas component present in the second sample constituting a measure of the amount of the first gas component present in the gas;wherein the first component probe further comprises a modular converter device for converting the first gas component to the second gas component positioned within the first passage so that the first sample contacts both the inner wall of the first component probe and the modular converter device as the first sample is conveyed along the first passage, wherein the modular converter device comprises shavings of a catalytic material disposed across an entire cross-section of the first passage, wherein a first end and a second end of the modular converter device each comprise a perforated plate for maintaining the modular converter device within the first passage, and wherein the inner wall of the first component probe, the perforated plates, and the shavings are made of the same catalytic material; andwherein the first gas component is NO2 and the second gas component is NO. 2. A probe according to claim 1, wherein the inner wall of the first component probe is made of a nickel alloy efficient at converting NO2 to NO, and the inner wall of the second component probe is made of a ceramic material. 3. A probe according to claim 2, wherein the ceramic material is glass. 4. A probe according to claim 3, wherein the first component probe comprises a first tube made of the nickel alloy, the second component probe comprises a second tube made of the ceramic material, the first and second tubes are arranged parallel and adjacent to one another, and the first and second tubes are secured to one another at a respective position along a length of the first and second tubes and at a position downstream from an end of each of the tubes such that the first tube supports the second tube. 5. A probe according to claim 4, wherein: the first sample inlet includes a first plurality of holes at spaced positions along the length, the first component probe taking the first sample by way of the first plurality holes; andthe second sample inlet includes a second plurality of holes at spaced positions along the length, the second component probe taking the second sample via the second plurality of holes. 6. A probe according to claim 5, wherein the first and second pluralities of holes are formed in the same sides of the first and second tubes and at corresponding positions along the lengths of the tubes. 7. A probe according to claim 6, wherein the probe is suitable for determining the amount of NO2 present in exhaust gas produced by a gas turbine engine. 8. The probe according to claim 1, wherein the same catalytic material is a nickel alloy. 9. A probe, comprising: a mounting plate configured to be secured proximate a flow of combustion gas:a first component probe secured to the mounting plate, configured to protrude into the flow of combustion gas, and comprising an inner wall that defines a first passage, the first passage extending through the mounting plate, into the flow of combustion gas within the first component probe, and to a first sample inlet, the first sample inlet configured to receive a first sample of the combustion gas, wherein the inner wall of the first passage extending into the flow of combustion gas comprises a material that converts the first gas component to the second gas component; anda second component probe secured to the mounting plate and configured to protrude into the flow of combustion gas, comprising a second passage defined by an inner wall of the second component probe, the second passage extending through the mounting plate, into the flow of combustion gas within the second component probe, and to a second sample inlet, the second sample inlet configured to receive a second sample of the combustion gas. 10. The probe of claim 9, wherein the first passage extending into the flow of combustion gas within the first component probe is in thermal communication with the combustion gas, and wherein the thermal communication expedites the conversion of the first component gas to the second component gas. 11. The probe of claim 9, wherein during operation the first component probe is configured to convert all of the first gas component to the second gas component prior to exiting the first passage. 12. The probe of claim 9, wherein the first component probe and the second component probe extend parallel to each other. 13. The probe of claim 9, wherein during operation the first component probe is secured to the second component probe within the flow of combustion gas, and wherein the first component probe provides structural support for the second component probe. 14. The probe of claim 9, further comprising a modular converter device disposed within the first passage and within the flow of combustion gas. 15. The probe of claim 9, wherein the first sample inlet and the second sample inlet are disposed at corresponding positions along respective lengths of the first component probe and the second component probe.