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Dräger<br />
68| Dräger-<strong>Tubes</strong> & CMS-<strong>Handbook</strong><br />
The measuring procedure is always the same, so there is no need to remember multiple<br />
procedures for different chips. This allows simple and short-time user training and makes<br />
working with this new system on a daily basis much easier.<br />
The quantity of reagent used in each capillary is extremely small, resulting in high<br />
sensitivity to the measured gas. Furthermore, the use of smaller amounts of active<br />
chemicals has a considerable environmental benefit as regards disposal and preparation for<br />
re-use - the amount of work involved in this regard has been significantly reduced. The chip<br />
housings themselves can be recycled and reused without reprocessing.<br />
3.4 The Analyzer<br />
The analyzer records the measurement effect optoelectronically, thereby eliminating human<br />
factors. The gas inlet for the sample air is located at the front of the analyzer and is<br />
protected from dust and other impurities. When the integrated mechanics have established<br />
an air-tight connection between the entire gas conduction system and the open capillary of<br />
the chip, a special pump system pulls a constant mass-flow of air through the capillary.<br />
The pump system consists of a mass-flow-controller, a processor, and a small electric<br />
membrane pump. The processor regulates the pump performance for the nece ssary<br />
mass-flow. This combination supports an accurate mass-flow and compensates for<br />
fluctuations in the ambient air pressure, within certain limits. No correction of the<br />
mea surement result is necessary, regardless of whether the measurement is to be carried<br />
out at the Dead Sea or in the mountain air of Mexico City.<br />
In the CMS, miniaturization has<br />
resulted in a reduction in the sample<br />
volume necessary for a measurement.<br />
For a typical measurement,<br />
only 30 mL of air is needed<br />
for a measuring time of approximately<br />
two minutes and a mass-flow<br />
of 15 mL/min. For shorter measuring<br />
times correspondingly less air is<br />
needed. This results in a more accurate<br />
measurement value which may<br />
otherwise be affected by fluctuating concentrations<br />
over a longer measurement period.<br />
Optics<br />
D-1232-2009<br />
6406070<br />
1000.25000 ppm<br />
Kohlenstoffdioxid<br />
Carbon Dioxide<br />
Batch: ARJB-0001<br />
Pump<br />
System<br />
Gas<br />
Inlet<br />
Processor<br />
Flow Chart of the Measuring Principle<br />
Software Electronic<br />
Housing
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