Teledyne manual M201A Maintenance Schedule, Maintaining the M501NH Converter

Teledyne API Model 201A NH3 Analyzer Instruction Manual, 04689, Rev. B1

3.0MAINTENANCE SCHEDULE

3.1M201A 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
M501NH3 Converter	Check every 6 months
Reaction Cell	Clean quarterly as
	necessary
AutoZero flow check	Quarterly as needed

Reference Section

Section 3.2

Sect 9.3.8, Fig 8-3 in the M200A Manual

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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