Teledyne 6200E - Sulfides Analyzer - Manual (Page 197)

Model 6200E Instruction Manual Instrument Maintenance
M6200E Rev: A1 197
5. Refill the scrubber with charcoal at the bottom, a white felt-divider and the Purafil © chemical
at the top.
6. Put another felt-divider on top of that, then close the cartridge with the screw-top cap.
7. Tighten the cap on the scrubber - hand-tight only.
8. Replace the DFU filter with a new unit and discard the old.
9. Replace the scrubber assembly into its clips on the rear panel.
10. Reconnect the plastic tubing to the fitting of the particle filter.
11. Adjust the scrubber cartridge such that it does not protrude above or below the analyzer in
case the instrument is mounted in a rack. If necessary, squeeze the clips for a tighter grip on
the cartridge.
9.3.5. Maintaining the H
2
S Æ SO
2
Converter
The catalyst contained in the H
2
S Æ SO
2
converter of your M6200E must be replaced periodically
in order for the analyzer to continue measuring H
2
S accurately and reliability.
This material is capable of efficiently converting H
2
S into SO
2
for up to 6000 ppm/hours. This
means that if the H
2
S content of the sample gas is typically around 600 ppb, the scrubber will
function for approximately 10 000 hours, a little over 13 months. If, however, the typical
ambient H
2
S level of the sample gas is 1000 ppb, the scrubber would only last for approximately
6000 hours or about 8 months.
9.3.5.1. Predicting When the Converter Catalyst Should Be Replaced.
To determine how long the H
2
S Æ SO
2
converter will operate efficiently:
1. Measure the amount of H
2
S in the sample gas.
2. Divide 6000 by the H
2
S concentration.
EXAMPLE: If the H
2
S concentration is 750 ppb:
Operational hours = 6000 ppm/hr ÷ 0.75 ppm
Operational hours = 100 000 ppb/hr ÷ 750 ppb
Operational hours = 8000 hrs
9.3.5.2. Checking the Efficiency of the H
2
S Æ SO
2
Converter
To check to see if your H
2
S Æ SO
2
converter is operating properly:
1. Set the analyzer to SO
2
measurement mode (see Section 6.8.1).
2. Supply a gas with a known concentration of SO
2
to the sample gas inlet of the analyzer.
3. Wait until the analyzer’s SO
2
concentration measurement stabilizes. This can be determined
by setting the analyzer’s display to show the SO2 STB test function (see Section 6.2.1) SO2
STB should be 0.5 ppb or less before proceeding.