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Colorimetric Detector Tubes

What are Colorimetric Detector Tubes?

A colorimetric detector tube is a glass tube filled with a solid material gel that has been impregnated with an indicator chemical. When the detector tube is used the ends are broken off and the tube is inserted into a bellows or piston pump. An arrow on the tube indicates which end of the tube to insert into the pump orifice. A predetermined volume of air is pulled through the pump. The contaminant of interest reacts with the chemical in the tube. This reaction produces a stain in the tube with a length proportional to the concentration of the contaminant.