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40| Dräger-<strong>Tubes</strong> & CMS-<strong>Handbook</strong><br />
2.7 Extension Hose<br />
An extension hose provides a convenient means to test the air quality in difficult to reach<br />
areas such as grain silos, storm drains, sewers and tanks, prior to entry. One end of the<br />
hose is equipped with an adapter to connect the extension tube securely to the Dräger-<br />
Tube pump. The other end of the hose has a tube holder assembly which provides a gas<br />
tight fit when the Dräger-Tube is inserted. The extension hose is made of a fuel<br />
resistant synthetic rubber.<br />
Since the Dräger-Tube is connected at the inlet of the extension hose and the Dräger-Tube<br />
pump is connected at the outlet end of the extension hose, the volume of the hose has no<br />
influence on the reading. However, when extension hoses longer than the standard 3 m<br />
hose are used, correction factors or additional time to draw the sample may be required<br />
and should be reviewed with the local Dräger subsidiary or distributor.
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