Teledyne 6200A - Sulfides analyzer - Manual (Page 8)

TAI - Thermal Converter Operator Manual - Page 4
2.2 The 6200A Sulfides Analyzer
The TAI Model 6200A Sulfides Analyzer, is designed to measure mixed sulfur impurities, collectively
referred to as TRS, in carbon dioxide (CO2) gas. Since there is no SO2 scrubber in the system, the
instrument reading is the sum of the reduced sulfur compounds and SO2. The 6200A consists of a
modified 6200A UV Fluorescence SO
2
Analyzer and a M501TRS high temperature quartz converter.
The M501TRS converts sulfur compounds to SO
2
at high temperature by flowing the gas through a hot
quartz tube, the resultant reaction is as follows:
TRS + O
2
--> SO
2
Since the gas being analyzed is CO2, which generally contains no oxygen, there is an assembly that injects
a small amount of air into the sample stream resulting in about 4% oxygen in the sample. The added
oxygen allows the sulfur compounds to be oxidized to SO2. Any SO2 present in the sample is unaffected
by the converter. The sample gas then passes to a modified 6200A analyzer where the converted
compounds are analyzed as SO
2
.
2.3 Configurations
There are three configurations available:
1. The standard unit consisting of:
• A modified 6200A Fluorescent SO2 Analyzer
• A M501TRS High Temperature Converter
• See Figure 2.1 for the pneumatic diagram
2. The standard unit described above plus:
•
An Internal Zero/Span (IZS) Option with H2S permeation tube
•
The IZS option uses sample gas, passed through a charcoal scrubber to dilute H2S from
the perm tube plus a converter bypass valve to assure a high quality zero/span
calibration.
• See Figure 2.2 for the pneumatic diagram
3. The standard unit described above plus:
•
An external PRC-6000 calibrator for blending tanks of H2S or SO2 span gas with CO2.
•
See Figure 2.3 for the pneumatic diagram