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Instrument Maintenance Model T101 Instruction Manual
204
EXAMPLE: If the SO
2
concentration is 125 ppb:
Operational hours = 1000 ppm/hr ÷ 0.125 ppm
Operational hours = 1,000,000 ppb/hr ÷ 125 ppb
Operational hours = 8000 hrs
8.3.3.2. Checking the Function of the SO
2
Scrubber
To check to see if your SO
2
scrubber is operating properly:
1. With the analyzer set of H
2
S measurement mode, introduce gas mixture
into the sample gas stream that includes SO
2
at a concentration of at
least 20% of the reporting range currently selected (see Section 4.4.4.3).
For example, if the ana
lyzer is set for a Single Range & 500 ppb, a
concentration of 1000 ppb would be appropriate.
2. An increase of more than 2% in the H
2
S reading is an indication that the
efficiency of the scrubber is decreasing to the point that the absorbing
material should be replaced.
8.3.3.3. Changing the SO
2
Scrubber Material
1. Input zero air for 5 minutes
2. Turn off analyzer
3.
Locates the SO
2
scrubber cartridge in the front of the analyzer, looks like
a big white cylinder (See Figure 3-9).
4.
Undo the two 1/8 inch fittings on the top of the scrubber
5.
Remove the two screws holding the scrubber to the instrument chassis
and remove the scrubber
6.
Take the two Teflon fitting off the instrument.
7.
Empty the SO
2
scrubbing material in to a hazmat bin
8.
Fill each side of the scrubber with new SO
2
scrubber material until it is ½
an inch from the bottom of the thread lines so about ½ inches from the
top of the scrubber, do not fill it too high or the fitting will crush the
material.
9.
Remove the Teflon tape from both of the removed fittings, and re-tape
them with new Teflon tape.
10.
Install both fittings back onto the scrubber.
11.
Put the scrubber back into the analyzer and replace the two screws on
the bottom.
12.
Screw the two 1/8 fittings back onto the top of the scrubber, they can be
hooked up either way.
13. Return analyzer to normal operation
07266B DCN6485