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Color Diffusion Tubes

  • Draeger Color Diffusion Tubes Cat. No. 800 Series On-the-spot results

  • Simple-to-use and economical; Break tube end off and sample; No pump needed

  • Accurate and reliable TWA sampling; Calibrated scale printed directly on tube allows on-the-spot reading of exposure; No charts or lengthy calculations needed

  • Convenient and easy-to-use tube holder
    Allows safe tube end removal and secure sampling in the breathing zone

Using the principles of gas diffusion and colorimetric reaction, Dräger Color Diffusion Tubes allow the user to reliably measure Time-Weighted Average (TWA) concentrations for up to eight hours. An easy-to-use tube holder allows safe tube end removal and secure sampling. Color Diffusion Tubes can be evaluated at any point during a workshift. The calibrated scale printed directly on each tube indicates parts-per-million-hours (ppm-hours). For a TWA reading, simply determine the point where the stain length ends and divide this reading by the total length of sampling time. No pumps, charts, or analyses are needed.

To use a Diffusion Tube, place the tube in the tube holder with the red dot on the tube visible above the hinged portion of the holder
(Figure 1).
Figure 1: To use a Diffusion Tube, place the tube in the tube holder with the red dot on the tube visible above the hinged portion of the holder.
Figure 1
Open the tube by grasping the ends of the tube holder, with the red dot on the tube away from the body, and bending the holder until the tube breaks (Figure 2). Figure 2: Open the tube by grasping the ends of the tube holder, with the red dot on the tube away from the body, and bending the holder until the tube breaks.
Figure 2
Remove the end of the tube from the holder and discard. The Diffusion Tube is ready for use. Snap the tube into the tube holder with the open end positioned at the open end of the holder (Figure 3). Figure 3: Remove the end of the tube from the holder and discard. The Diffusion Tube is ready for use. Snap the tube into the tube holder with the open end positioned at the open end of the holder.
Figure 3

Attach the diffusion tube holder to a worker's pocket or lapel and note the starting time of the test. At the end of the workshift, or any time during the workshift, the user can evaluate the tube.



When using Diffusion Tubes, the Time-Weighted Average (TWA) can be calculated at any time during the measurement by simply dividing the length of the tube reading (in ppm-hours) by the elapsed sampling time (in hours).

Ordering Information                                         Online Ordering
Chemical Hazard Measuring Range (ppm-hrs) Qty.
(per pkg.)
Cat. No.
Acetic acid 1.3 - 200 10
Ammonia 2.5 - 1500 10
Butadiene 1.3 - 300 10
Carbon dioxide 65 - 20000 10
Carbon dioxide 0.13 - 30 vol% 10
Carbon monoxide 6 - 600 10
Ethanol 125 - 25000 10
Hydrochloric acid 1.3 - 200 10
Hydrocyanic acid 2.5 - 200 10
Hydrogen sulfide 1.3 - 300 10
Nitrogen dioxide 1.3 - 200 10
Perchloroethylene 25 - 1500 10
Sulfur dioxide 0.7 - 150 10
Toluene 13 - 3000 10
Trichloroethylene 25 - 1000 10
Color Diffusion Tube holders 3

This page was last modified June 1, 2004
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This site was last modified May 13, 2008

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