The analyzer requirements are to measure residual H2 at the outlet of the reduction reactor and the SO2 at the inlet of the absorber. The H2 measurement is to maintain excess H2 after the reduction reactor, typically 2 – 4%, which ensures complete reduction of SO2 to H2S. Insufficient H2 causes SO2 breakthrough to the amine solvent which will react to form heat stable salts and degrade the amine. The AMETEK Western Research Model 931/932 analyzers are used to measure SO2 and H2 after the reduction reactor.
The AMETEK Model 931 uses AMETEK’s proprietary high-resolution UV technology in a dual-beam, dual-wavelength configuration and no-moving parts design. Instead of using a filter/chopper wheel to alternate between measure and reference wavelengths, the Model 931 uses a fixed optical configuration and pulsed UV lamps. This design leads to increased light throughput, reduced noise levels, and reduced maintenance. The dual beam configuration, combined with the reference measurement, ensures low noise performance with minimal baseline and span drift.
The AMETEK Model 931 uses AMETEK’s proprietary high-resolution UV technology in a dual-beam design and incorporates a filter wheel that allows the measurement of up to five components.