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Color Diffusion Tubes


Orderable Items Dräger Color Diffusion Tubes provide passive screening for personal monitoring of exposure to chemical hazards in many applications.



  • 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 work shift. 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 work shift, or any time during the workshift, the user can evaluate the tube.



When using Diffusion Tubes, the time-weighted average 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).