
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com
15
10. If CO
2
is present in the gas bag, the Dräger tube will turn purple. Record
the stain length in units marked on the Dräger tube and include any faint
blue tinge color that may develop as part of the total stain reading. For
more accurate results, the darkened length should fill more than half of
the total length of the tube. Therefore, the filtrate sample volume must be
carefully selected.