Model 930 H2S in Sulfur Pit Analyzer

Model 930 H2S in Sulfur Pit Analyzer
Overview
In many sulfur recovery units, produced sulfur is stored in liquid form in sulfur pits. Operators are increasingly aware that sulfur pits present potential danger to plant personnel and overall plant safety. It is therefore critically important to monitor H2S in the vapour space of sulfur pits to ensure that it remains below the Lower Explosive Limit (LEL) (4.3% by volume). Additionally, the presence of rising concentrations of SO2 in the sulfur pit vapour space provides an early indication of smoldering fires. Therefore, on-line, continuous monitoring of SO2 can enable detection of such fires before they get out of control.
The Model 930 H2S Vapour Space Analyzer was developed  for sulfur pit storage applications. The AMETEK-designed Model 930 has been field proven as one of the industry’s most reliable instruments for monitoring H2S and SO2.

The Model 930 uses a proprietary high resolution UV technology in a dual beam, multiple wavelength configuration. Resolution better than 0.02 nm is provided by high intensity, line source lamps. These sources emit at a fixed wavelength, providing great measurement stability, and emit low total power, removing the potential for sample photolysis. The dual beam configuration, combined with the reference measurement, ensures low noise performance, with minimal baseline and span drift.

The Model 930 analyzer samples the vapour space gas using proven ASR Probe technology. The sampling system has a sulfur knock-out at the probe to eliminate entry of excess sulfur vapour or liquid into the system. The sample is transported through an electrically traced sample line.
 
Features
  • Simultaneous, accurate measurement of both H2S and SO2
  • Output alarms for H2S (LEL) and SO2 (smoldering fire)
  • Common design with Model 900 (air demand) and Model 910 (stack gas)
  • Exceptional baseline stability
  • Improved sample conditioning via ASR Probe

Other Products of Interest:

To learn more about the Sulfur Recovery Process, please visit our website sru.ametekpi.com.
  • Specifications +


    Methodology Multiple wavelength, high resolution, nondispersive UV
    Typical Range 0 to 4% H2S, 0 to 2% SO2 (other ranges available on request)
    Accuracy Better than 1% full scale
    Repeatability Better than 0.5% full Scale
    Linearity Better than 1% full scale
    Response Time Typically less than 30s to T90 (excl. sample system)
    Sample Transport Air aspiration
    Typical Sample Flow 3 to 5 L/min (0.1 to 0.2 CFM)
    Temperature Control Independent control of four zones (oven, sample line, probe, vent line)
    Ambient Temperature 5° to 50°C (41° to 122°F)
    Instrument Air Minimum 413.6KPa (60 psig), 120 L/min (4.24 CFM), instrument quality air
    Power 120 VAC ±10%, 47-63 Hz or 240 ±10%, 47-63 Hz; 600 W for analyzer only excluding sample and vent line and ASR probe
    Analog Outputs 4 to 20 mA self-powered (optional loop-powered), maximum of 4
    Communications RS422 with Modbus protocol
    RS485 optional
    Ethernet optional
    Relays 3 independent sets of SPDT relays alarm conditions
    Physical Dimensions 1553.6 x 1117.6 x 306 mm (61.17 x 44 x 12 in.)
    Weight Estimated minimum 160 kg (350 lbs)
    Approvals and Certifications NEC/CEC Class I, Division 2, Groups C & D
    ATEX II 2G EEx pd IIB T3
    Russian Ex Proof Certification; 1ExpydIIBT3
    Russian Gosstandart Pattern Approval
    Complies with all relevant European Directives
  • Documents +

  • Certifications +


    • NEC/CEC Class I, Division 2, Groups C & D
    • ATEX II 2G EEx pd IIB T3
    • Russian Ex Proof Certification; 1ExpydIIBT3
    • Russian Gosstandart Pattern Approval
    • Complies with all relevant European Directives