A very cost-effective and reliable way for the periodically measuring concentrations of water (H2O) or hydrogen fluorine (HF) vapors within the furnace atmosphere.
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These sample tubes are glass vials filled with a chemical reagent that reacts to a specific chemical or family of chemicals.
A calibrated quantity of sample air is drawn through the tube with a bellows pump.
If the targeted chemical(s) is present the reagent in the tube changes color and the length of the color change typically indicates the measured concentration.