Presently, there is no single detector which has
all the desirable capabilities and performance functions, and currently
available detectors all vary considerably in cost, performance and reliability.
As such care must be taken to select a detector based on the abovementioned
factors and operational requirements. Furthermore, many detector manufacturers
make claims based on their own testing, some of which have not been thoroughly
verified by third party laboratories. In this case we have only different
stages of the same process: hazardous chemical is used in the production; concerning
the hazards and subsequent problems with the legislative regulations of the
finances, producers start to search for alternative technology; technology is
developed and implemented; technology is used for making majority of the
related product without the use of hazardous substance. In the example of phosgene
– this process just begun in the near past, in the case of hydrogen cyanide –
the process is near the end, and in case of other chemical process is at the
end. The old technology with a hazards replaced by new
one – more friendly to the environment and human health.