Teledyne 6200E - Sulfides Analyzer - Manual (Page 198)

Instrument Maintenance Model 6200E Instruction Manual
198 M6200E Rev: A1
4. Record the stable SO
2
concentration
5. Set the analyzer to H
2
S measurement mode (see Section 6.8.1).
6. Supply a gas with a known concentration of H
2
S, equal to that of the SO
2
gas used in steps 2-
4 above, to the sample gas inlet of the analyzer.
7. Wait until the analyzer’s SO
2
concentration measurement stabilizes. This can be determined
by setting the analyzer’s display to show the H2S STB test function (see Section 6.2.1) H2S
STB should be 0.5 ppb or less before proceeding.
8. Record the stable H
2
S concentration
9. Divide the H
2
S concentration by the SO
2
concentration
EXAMPLE: If the SO
2
and H
2
S concentration of the two test gases used is 500 ppb:
Measured SO
2
concentration = 499.1 ppb
Measured H
2
S concentration = 490.3 ppb
Converter Efficiency = 490.3 ÷ 499.1
Converter Efficiency = 0.982 (98.2%)
10. It is recommended that the H
2
S Æ SO
2
converter catalyst material be replaced if the converter
efficiency falls below 96% or whatever efficiency rating is specified by local regulatory
requirements..
9.3.5.3. Changing the H
2
S Æ SO
2
Converter Catalyst Material
The H
2
S Æ SO
2
converter is located in the center of the instrument, see Figure 3-9 for location,
and 9-3 for the assembly. The converter is designed for replacement of the cartridge only, the
heater with built-in thermocouple can be reused.
• Turn off the analyzer power, remove the cover and allow the converter to cool.
• Remove the top lid of the converter as well as the top layers of the insulation until the
converter cartridge can be seen.
CAUTION
The converter operates at 315º C. Severe burns can result if the
assembly is not allowed to cool. Do not handle the assembly until it is at
room temperature. This may take several hours.
• Remove the tube fittings from the converter.
• Disconnect the power and the thermocouple of the converter. Unscrew the grounding
clamp of the power leads with a Phillips-head screw driver.
• Remove the converter assembly (cartridge and band heater) from the can. Make a note of
the orientation of the tubes relative to the heater cartridge.
• Unscrew the band heater and loosen it, take out the old converter cartridge.