Teledyne API Model 200AH NO
X
Analyzer Instruction Manual, 06492, Rev. G2
6-6
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 NO
2
are expected in the sample stream, the high temperature
converter converts only about 90 % of the total NO
2
, the moly must convert the rest. Since the
moly operates by reacting the molybdenum metal with the NO
2
, its lifetime can be quite short if
high levels (>50 ppm) of NO
2
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.
