Water Vapor Sensitivity Response of Hydrogen Flame Ionization Detectors

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Abstract
An 18.7% sensitivity reduction was observed for a hydrogen FID burning in oxygen containing 12.3 mole % water vapor. A continuous air quality monitoring FID at 40°C can experience 4.7% signal changes with variations of 100 to 50% in atmospheric relative humidity. The variation in sensitivity loss is nonlinear and the rate increases significantly with the oxygen water content. Approximately ¼ of the total sensitivity reduction is ascribed to the flame temperature drop arising from larger flame heat loss rates and flame gas thermal capacitance induced by the oxygen water. It appears the remaining fraction of sensitivity loss is due to FID electrode inefficiency in collection of the hydrated ions the water vapor molecules form.

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