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53
9.1.
Additional and Updated Maintenance Procedures
The following procedures need to be performed regularly as part of the standard
maintenance of the Model T102.
9.1.1.
Maintaining the SO
2
Scrubber
This section supersedes the Changing the SO
2
Scrubber Material section in the T101
Manual - PN 07266.
Unlike the T101 which includes an internal scrubber to remove SO
2
from the sample gas
before the H
2
S

SO
2
conversion takes place, the T102 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.
9.1.1.1. Predicting When to Replace the SO
2
Scrubber
To determine how long the SO
2
scrubber will operate efficiently:
1. Measure the amount of SO
2
in the sample gas.
• If your T102 has the multigas measurement options activated, this
can be done by following instructions found in the Setting the Gas
Measurement Mode section in the T101 Manual (PN 07266) 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
07267B DCN6485