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GAS ANALYZER 

Acid Gas Analyzer

  • Monitors the concentration of H2S in the acid gas feed to the sulfur-recovery unit
  • Provides information for feed-forward control of main air valve 


Tail Gas Analyzer

   • Monitors the H2S and SO2 concentration in the sulfur-recovery unit’s tail gas
   • Provides information for feed-back control of the trim air valve 
Sulfur Pit Analyzer

   • Monitors the H2S and SO2 concentration in the vapor head space of the sulfur pit
       1)Assures that H2S concentration does not exceed the lower explosive limit for H2S
       2)Provides early warning of potential smoldering fires 
CEM (Continuous Emissions Monitor)

        • Monitors the SO2 concentration in the incinerator stack
        • Ensures compliance with SO2 emission 



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1 Colorimeter
The Sentinel Colorimeter uses colorimetric sensors to measure the induced optical absorption produced as a result of reaction of the component with reagents to form a colored complex. The system’s dual-wavelength optical configuration and an autoblank feature compensate for background color and turbidity. A submerged colorimetric probe measures the absorbance of the solution after reaction of sample and reagents; color produced by chemical reaction is directly proportional to the analyte being measured. The probe is cleaned and rinsed between analyses, thus eliminating the problems of optics fouling. The standard probe is made of Kynar™ and the reflector of Hastelloy C, which provides excellent chemical resistance. The probe can be supplied in two different standard optical path lengths, 2 and 4 cm, determined by concentration. True multi-featured two-point calibration technique enables routine check of trace analysis by simply using distilled water. A periodic check of span standard can also be performed easily.
Parameters
Aluminum
Chlorine (free & total)
Chromium
Copper
Hardness in brine
Iron
Manganese
Phosphate
Silica


2 Titrator
The Sentinel Titrator enables on-line colorimetric and potentiometric (pH and redox) measurement, where the titrant volume required to reach equilibrium is proportional to the concentration of the analyte being measured. The Sentinel Titrator can perform single or dual end-point titrations and is equipped with three detection methods (fixed, relative, and derivative endpoint) to ensure flexibility and accuracy. Expanded diagnostic capabilities include programmable learn cycles to detect chemistry endpoints automatically. Users may program several methods and the system allows for multiple reagents to be added. Analyses are fully automatic in all cases. Users can easily change the frequency of analysis and calibration, as well as most default values, to improve or customize a setup; three different access levels provide system security. Automatic calibration is user-selectable and configurable with calibration repeat and alarm limits. The Sentinel Titrator also features a full auto-cleaning capability for reliability and reduced maintenance.
Parameters
Acid gas loading in amine scrubbers
Acids
Alkalinity
Caustic
Carbonate
Cyanide
Hardness
Iron
Peroxide
Silver


3 Ion Selective Electrode (ISE) Analyzer

The Sentinel ISE enables direct electrode measurement of ions in the sample using potentiometric sensors. Appropriate analytes include chloride, cyanide, fluoride, sodium, sulfide, nitrate, ammonia, and others. The single known addition (SKA) technique compensates for electrode drift on every analysis. The Sentinel ISE analyzer is fitted as standard with an RTD-100 temperature sensor, which permits automatic temperature compensation of the analysis. Direct method is used for high-concentration analysis. Automatic calibration is user-selectable and configurable with calibration repeat and alarm limits. The calibration is performed using the SKA method on a calibration standard.
Parameters
Chloride
Cyanide
Fluoride
Sodium
Sulfide
Nitrate
Ammonia

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