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|47<br />
A<br />
Simultaneous Test-Set II there is a special evaluation of the Dräger-<strong>Tubes</strong> for chlorine,<br />
phosgene and sulfur dioxide. On these tubes, the second mark is missing.<br />
Whenever the concentration of a gas is critical or highly critical the actual concentration of<br />
this gas is verified using the respective Dräger-Tube.<br />
A decision about possible measures always depends on how the concentration of the<br />
emerging gas will develop. In addition, the individual ambient conditions must be taken into<br />
account. Therefore, decisions can principally only be made by the incident commander on<br />
site.<br />
Measurement of combustion and decomposition gases<br />
In every fire, combustion and decomposition gases are evolved. There is danger of<br />
combustion and decomposition gases developing in higher concentrations during and<br />
particularly after the fire. These gases present a significant toxicity hazard for persons in<br />
the immediate as well as adjacent areas. These areas include e. g.<br />
- adjoining rooms<br />
- adjacent floors<br />
- adjacent buildings<br />
- neighboring streets<br />
To realise the full benefit of these tests, both sets must<br />
be used, otherwise hazardous gases with poor warning<br />
properties could be overlooked.<br />
Studies have shown that more than 450 substances<br />
are evolved as the result of fire. While all of these gases<br />
are not present in every fire, there are 11 inorganic<br />
gases that are most commonly present. Ten of these<br />
gases are measurable using the<br />
- Dräger Simultaneous Test-Sets I and<br />
- Dräger Simultaneous Test-Set II<br />
2-230-92<br />
Measuring with the<br />
Dräger Simultaneous Test-Set
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