Teledyne API Model 200AH NOX Analyzer Instruction Manual, 06492, Rev. G2
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The M501 contains 2 converters, a high temperature stainless steel and a molybdenum converter.
While this combination produces very high conversion efficiencies, the life of the moly must be
considered. If high levels of NO2 are expected in the sample stream, the high temperature
converter converts only about 90 % of the total NO2, the moly must convert the rest. Since the
moly operates by reacting the molybdenum metal with the NO2, its lifetime can be quite short if
high levels (>50 ppm) of NO2 are present.
In instruments that have the external converter option, the Mini HiCon housing assembly
contains only the catalytic ozone killer and a heater to keep the ozone catalyst temperature at
200°C. Its temperature is monitored in the TEST function O3KL.