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Teledyne API Model 201A NH
3
Analyzer Instruction Manual, 04689, Rev. B1
3.0 MAINTENANCE SCHEDULE
3.1 M201A Maintenance Schedule
The maintenance requirements of the M201A are essentially like a standard M200A
NOx analyzer. Please refer to Table 8-1 in the M200A Operator Manual for the M200A
maintenance schedule.
In Table 3.1 below, there are the extra maintenance items required by the M201A.
Table 3.1: Preventative Maintenance Schedule
Item Maintenance Interval Reference Section
M501NH3 Converter Check every 6 months Section 3.2
Reaction Cell Clean quarterly as
necessary
Sect 9.3.8, Fig 8-3 in
the M200A Manual
AutoZero flow check Quarterly as needed Section 3.3
3.2 Maintaining the M501NH Converter
The M501NH Converter is operated at very high temperature. The center tube in the
converter slowly oxidizes and requires replacement. The most obvious indicator of
failure is no ammonia conversion, despite the converter being at temperature. This is
caused by the oxidized tube breaking off in the converter.
The following procedure describes how to disassemble and replace converter parts.
The various parts in the converter become delicate and brittle after prolonged exposure
to high temperatures. It is therefore a good idea to have a complete set of replacement
parts on hand before starting, as listed in Table 3.1.
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