E C O P H Y S I C S Introduction
CLD 780 TR / July 2000 6
Nitrogen-monoxide (NO), Ozone (O
3
) and especially nitrogen dioxide
(NO
2
) are toxic! Following the recommendations and instructions in this
manual assures safe operation when the analyzer is correctly used
(”intentional use” condition).
Specific dangers with the analyzer
NO
Nitrogen monoxide is used only for calibration. This should be performed
at a similar concentration as the expected concentration of the sample
gas.
NO
2
We recommend that for the determination of NO
2
the converter shall be
checked by the principle of gas-phase-titration (GPT; refer to section
6.2.4). However, when using bottled NO
2
extreme care shall be observed
on account of the high toxicity to avoid any leakage of the gas.
O
3
Ozone is produced inside the analyzer in the ozone generator using
dried ambient air. In a correctly installed and operated system this ozone
will be destroyed in the ozone scrubber located on and immediately up-
stream of the vacuum pump. Furthermore, the actual concentration of
ozone is low, and under fault conditions the ozone generator is automati-
cally shut down by the analyzer control system.
Dangers involving peripherals
A complete description of precautions to eliminate the dangers associated
with peripheral devices, which are application-specific, is beyond the
scope of this manual. As an example (relating to the sampling system)
special care should be observed when handling hot and aggressive
gases, and the appropriate safety precautions applied.
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