Teledyne 6200E - Sulfides Analyzer - Manual (Page 194)

Instrument Maintenance Model 6200E Instruction Manual
194 M6200E Rev: A1
5. Re-install the PTFE O-ring with the notches facing up, the glass cover, then screw on the hold-
down ring and hand-tighten the assembly. Inspect the (visible) seal between the edge of the
glass window and the O-ring to assure proper gas tightness.
6. Re-start the analyzer.
9.3.2. 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.
9.3.3. Maintaining the SO
2
Scrubber
The SO
2
scrubber of your M6200E 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.
9.3.3.1. Predicting When the SO
2
Scrubber Should Be Replaced.
To determine how long the SO
2
scrubber will operate efficiently: