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INSTRUMENT MAINTENANCE M102E/M501 TRS
(Addendum to M101E Manual - P/N 04740 Rev A)
8.1. Additional and Updated Maintenance Procedures
The following procedures need to be performed regularly as part of the standard maintenance of
the Model 102E.
8.1.1. Maintaining the SO
2
Scrubber
This section REPLACES Section 9.3.3 of the M101E Manual - P/N 04740 Rev A.
Unlike the M101E which includes an internal scrubber to remove SO
2
from the sample gas before
the H
2
S Æ SO
2
conversion takes place, the M102E relies on the SO
2
scrubber of the M501-TRS to
perform the same function.
The SO
2
scrubber of your M501-TRS utilizes a consumable compound to absorb SO
2
from the
sample gas before the TRS is converted to SO
2
. This material must be replaced periodically in
order for the analyzer to continue measuring TRS accurately and reliability.
This material is capable of efficiently scrubbing SO
2
for up to 1000 ppm-hours. This means that if
the SO
2
content of the sample gas is typically around 100 ppb, the scrubber will function for
approximately 10,000 hours, a little over 13 months. If, however, the typical ambient SO
2
level
of the sample gas is 250 ppb, the scrubber would only last for approximately 4000 hours or about
5 ½ months.
8.1.1.1. Predicting When the SO
2
Scrubber Should Be Replaced.
To determine how long the SO
2
scrubber will operate efficiently:
1. Measure the amount of SO
2
in the sample gas.
• If your M102E has the multigas measurement options activated, this can be done by
following instructions found in Section 6.8.1 of the M101E Manual (P/N 04740 Rev A) and
selecting MEASURE MODE = SO
2
.
• Let the analyzer operate for 30 minutes, then note the SO
2
concentration.
2. Divide 1 000 by the SO
2
concentration.
EXAMPLE: If the SO
2
concentration is 125 ppb:
Operational hours = 1000 ppm/hr ÷ 0.125 ppm
Operational hours = 100 000 ppb/hr ÷ 125 ppb
Operational hours = 8000 hrs
40 05514 Rev A1