Sensor for measuring syngas ratio in the high temperature and pressure condition

A gas sensor assembly for monitoring carbon monoxide in a gas, said assembly comprising:

• a) a catalyst compartment, for receiving a first sample of a gas;
• b) a shift catalyst disposed in the catalyst compartment, for catalyzing a chemical reaction involving carbon monoxide in the first gas sample whereby hydrogen is produced;
• c) a product compartment in fluid communication with the catalyst compartment, for receiving some or all of the hydrogen produced by catalysis;
• d) a first metal filament disposed within the product compartment, for sensing the amount of hydrogen produced by catalysis;
• e) a reference compartment in fluid communication with the catalyst compartment, for receiving a second sample of the gas;
• and
• f) a second metal filament disposed within the reference compartment, for sensing the hydrogen contained in the second gas sample, thereby providing a reference value for analyzing the amount of carbon monoxide contained in the gas;
• wherein the reference, catalyst and product compartments are arranged to define a gas flow path from the reference compartment through the catalyst compartment into the product compartment.

A sensor assembly for determining the ratio of hydrogen to carbon monoxide in a gas, comprising:

• a reference compartment containing a portion of a feed mixture;
• a reaction compartment in which the feed mixture is reacted;
• a product compartment for receiving some or all of the feed reaction product;
• a sensing element disposed within the reference compartment for sensing a property of the feed mixture;
• and
• a sensing element disposed within the product compartment for sensing a property of the reaction product thereby providing a value for determining the ratio of hydrogen to carbon monoxide in the reaction product.