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Thick Film Catalytic Calorimeter

This technique relies on the combustion of carbon monoxide and oxygen over a catalytic surface. A four quadrant track is precision-printed onto a substrate using platinum ink. Each quadrant forms one leg of a Wheatstone bridge circuit.








A catalyst is printed across two quadrants, before a layer of protective glaze, having a consistent thickness, is printed over the complete circuit.









The disk is mounted in a measuring cell and heated to 300 degrees centigrade , at which stage the gas sample enters. Any carbon monoxide in the sample will burn on the catalytic surfaces, causing a heating effect. This alters the current in the circuit to produce an output that is proportional to the carbon monoxide concentration in the sample.









Benefits:

High sensitivity - state-of-the-art technology detects less than 30 parts per million change in gas concentration.

Excellent stability - unique design protects sensor and minimises drift, enhances reproducibility and improves long-term performances.

Accuracy - patented design, including platinum track only microns thick, gives accurate measurement and minimises cross interference.