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60| Dräger-<strong>Tubes</strong> & CMS-<strong>Handbook</strong><br />
The air volume to be drawn through the sampling tube is a function of the measured<br />
substance and the expected concentration. Usually the volume is between 1 and 20 L.<br />
Since the air volume is used as a reference for the concentration calculation (following the<br />
laboratory analysis), the pump has to meet strict criteria. Within the context of the Dräger<br />
sampling system the Dräger-Tube pump accuro, or the Dräger X-act 5000 are suitable for<br />
short-term measurements.<br />
Sampling tubes for active sampling<br />
Dräger-<strong>Tubes</strong> Primary Backup<br />
adsorption layer<br />
adsorption layer<br />
Activated Charcoal Type NIOSH 100 mg 50 mg<br />
coconut shell charcoal<br />
Activated Charcoal Type B 300 mg 700 mg<br />
coconut shell charcoal<br />
Activated Charcoal Type G 750 mg 250 mg<br />
coconut shell charcoal<br />
Silica Gel Tube Type NIOSH 140 mg 70 mg<br />
Silica Gel Tube Type B 480 mg 1,100 mg<br />
Silica Gel Tube Type G 1,100 mg 450 mg<br />
Sampling Tube Amines 300 mg 300 mg<br />
for aliphatic amines and dialkyl sulfates<br />
Passive Sampling<br />
Passive sampling is performed with diffusion samplers like the Dräger ORSA or the Dräger<br />
Nitrous Oxide diffusion samplers. In contrast to active sampling the transport of the<br />
contaminant molecules is achieved by diffusion processes and not by using a pump.<br />
Contaminant molecules from the ambient air follow a defined diffusion course and are<br />
adsorbed by the sorption agent of the diffusion sampler.
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