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Principle of Operation
- Plasma
emission spectroscopy is the basis for
the Argus-Hg series of CEM. Envimetrics has developed a unique plasma
source that is ultra stable, reliable, and has high power density. The
plasma source is driven by high power density microwave. The high power
density distinguishes it from other plasma sources and allows it to
outperform AES and AAS.
- Microwave power is absorbed by the electrons in the plasma. The electrons
reach high energies. The electrons collide with mercury in the gas
stream, causing the mercury to radiate both visible and ultra-violet
(UV) light. The electron energy is optimized to produce a large amount
of UV light from mercury and a minimal amount of UV light from all other
species in flue gas.
- A low-resolution
spectrometer measures the ultra-violet
light. Since the plasma source is optimized for mercury detection, only
an inexpensive low-resolution spectrometer is required.
- Envimetrics'
Argus Technology is the combination of
the plasma source and spectrometer to form the basis of highly sensitive
instrumentation for the measurement of emissions in gas streams.
- Multiple metals can be detected with the Argus concept (Aluminum, Arsenic,
Cadmium, Germanium, Iron, Lead, Magnesium, Manganese, Selenium, Zinc)
and nonmetals such as ammonia. Multiple species can be measured
simultaneously with one instrument.
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