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56| Dräger-<strong>Tubes</strong> & CMS-<strong>Handbook</strong><br />
2.12 Detection of Air Flows<br />
In some areas the detection of air currents is of particular<br />
importance. Slight air currents must become visible to estimate<br />
their source, direction and speed. This is necessary e. g.:<br />
- in mining<br />
for the monitoring of firedamp in inaccessible places;<br />
- in the industry<br />
for detection of leaks in pipelines, of air currents in rooms or<br />
for combustion plants and in laboratory stacks;<br />
- in the ventilation technique<br />
for control and setting up of air conditioning plants<br />
Dräger air flow tester<br />
2-342-93<br />
In addition to this measurement of the air currents are also helpful when estimating e. g.<br />
the distribition of toxic substances at workplaces. The knowledge of the air flow pattern<br />
permits objective selection of the right measuring points for any air analysis.<br />
With this aim in view Dräger developed an air flow tester. This Dräger-Tube consists of a<br />
porous carrier impregnated with fuming sulfuric acid. After opening the tube tips the air is<br />
pumped through the tube with the help of a rubber bulb. The white smoke emerging from<br />
the tube is carried along by the air flow and makes its direction visible. The air flow tester<br />
can be used repeatedly until the smoke is finally exhausted. If the test is completed before<br />
the tube is exhausted, the tube should be sealed with the rubber caps provided.<br />
Dräger Flow Check<br />
The Dräger Flow Check air current indicator produces a harmless cloud of smoke that floats<br />
freely and easily, because it has the same density as ambient air. Consequently, slight air<br />
currents become visible.<br />
The Dräger Flow Check consists of:<br />
- an instrument for the production of the clouds<br />
- an ampoule containing smoke-generating fluid<br />
The ampoule contains a fluid that is a special mixture of alcohols developed at Dräger. A<br />
small heating element in the head of the instrument heats the fluid which condenses on<br />
contact with the ambient air. The temperature of the heating element and the quantity of<br />
the fluid is electrically balanced.
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