Replaces 226-40. Tube 1 (7x70mm, 400mg Molecular Sieve treated with TEA) collects NO2. Tube 2 (7x110mm, 400mg treated silica gel oxidizer) converts NO to NO2. Tube 3 (7x110mm, 600mg Molecular Sieve treated with TEA) collects NO2. The NO2 ion is determined during analysis and labs use the SKC-supplied formula/graph to calculate NO ppm.
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