Measurement Process

The measurement process in the reaction cell is described by the following equation:

SO + hu1 -> SO2* SO* -> SO2 + hu2​​

Where hu1 is the incident UV energy at 214nm and hu2 is the resultant fluorescence, which is directly proportional to the SO2 concentration in the reaction cell. The fluorescence emission is in turn sensed by the photomultiplier tube (PMT) and amplified to provide an analog output. The result is a continuous measurement of total sulfur (i.e. H2S, CS2, COS, mercaptans​, etc.) as SO2 from 0-50 ppm to 0-20 ppm.

The Components

The 6200T comes complete with three 19” relay rack modules:

1. Sample Converter Module

Comes with an SO2 scrubber, sample/ambient air filters, high temperature dilution control orifice box and Total Reduced Sulfur (TRS)

2. Analysis Module

Consists of the UV fluorescence analyzer, pressure/flow transducers and vacuum pump.

3. Calibration Module (optional)

Consists of restrictor/orifice flow regulations and flow control system, all provided in a temperature controlled setting to ensure accurate performance. The two inlet ports allow use of two independent calibration gases which may be diluted to provide the required span gas concentration. Dilution ratios from 20:1 to 300:1 are manually set from the front panel.​

Electronics Platform

The 6200T combines the proven fluorescence principle with state of the art microprocessor technology to provide accurate and dependable measurement of trace levels of total sulfur. Long term stability is obtained by the use of an optical shutter to compensate for zero drift, coupled with lamp reference detector to correct for lamp drift.

The multi-tasking microprocessor allows easy field ranging from 50 ppm to 20 ppm as well as providing on-line indication of instrument status. The 6200T continuously checks operating parameters and provides alarms on out-of-specification conditions, including electrical and optical parameters.​​