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Model T101 Instruction Manual Instrument Maintenance
203
8.3.2. CHANGING THE IZS PERMEATION TUBE
1. Turn off the analyzer, unplug the power cord and remove the cover.
2. Locate the IZS oven in the rear left of the analyzer.
3. Remove the top layer of insulation if necessary.
4. Unscrew the black aluminum cover of the IZS oven (3 screws) using a
medium Phillips-head screw driver. Leave the fittings and tubing
connected to the cover.
5. Remove the old permeation tube if necessary and replace it with the new
tube. Make sure that the tube is placed into the larger of two holes and
that the open permeation end of the tube (plastic) is facing up.
6. Re-attach the cover with three screws and make sure that the sealing O-
ring is properly in place and that the three screws are tightened evenly.
7. Replace the analyzer cover, plug the power cord back in and turn on the
analyzer.
8. Carry out an IZS span check to see if the new permeation device works
properly. The permeation rate may need several days to stabilize.
WARNING
Do not leave instrument turned off for more than 8 hours without
removing the permeation tube. Do not ship the instrument without
removing the permeation tube. The tube continues to emit gas, even at
room temperature and will contaminate the entire instrument.
8.3.3. MAINTAINING THE SO
2
SCRUBBER
The SO
2
scrubber of your T101 utilizes a consumable compound to absorb SO
2
form the
sample gas that must be replaced periodically in order for the analyzer to continue
measuring H
2
S 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.
8.3.3.1. 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 T101 has the multigas measurement options activated, this
can be done by following instructions found in Section 4.5.1 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.
07266B DCN6485