Coming Soon Currently in pre-launch development Q4 2026
Sulfur Analysis Series
Model 800RS

Model 800RS Online Sulfur Ratio Analyzer

Continuous H₂S-to-SO₂ ratio monitoring for sulfur recovery unit tail-gas control, Claus-process optimization, and combustion-air management.

Brand: Blue Dragon Technology Supply & support: Blue Dragon Technology
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Product Overview

Purpose-built measurement, clearly presented.

Online sulfur-ratio analyzer for continuous H₂S and SO₂ measurement, calculated H₂S-to-SO₂ ratio, and SRU air-demand control integration.

Distinctive Capabilities

  • Continuous online H₂S and SO₂ monitoring
  • Combustion-air and trim-air optimization support
  • Fast process feedback for Claus-process control
  • Project-engineered sample handling
  • Configurable analog outputs, alarms, and digital communications
Performance & Technical Data

The measurement method and the values that matter.

How it measures

Measurement Principle

The planned Model 800RS platform continuously measures H₂S and SO₂ in conditioned sulfur recovery tail gas. It calculates the H₂S-to-SO₂ ratio and can provide an air-demand or ratio-control signal. Final optical detector architecture, ranges, and validated response performance will be stated in the approved product datasheet.

Analysis TimeConfiguration dependent; final performance value to be confirmed
Measurement ParametersHydrogen sulfide (H₂S) and sulfur dioxide (SO₂)
Calculated parameterH₂S-to-SO₂ ratio
Optional process outputAir-demand or ratio-control signal where configured
Sample PhaseGas
Primary applicationSulfur recovery unit tail-gas ratio monitoring

Complete Technical Data

Process compatibility
Claus sulfur recovery and associated tail-gas treatment processes
Measurement Principle
Continuous optical gas analysis; final detector configuration to be confirmed
Measurement ranges
Project-specific; final H₂S and SO₂ ranges will be published in the approved datasheet
Ratio range
Configuration dependent; final display and control range to be confirmed
Analog outputs
Configurable 4–20 mA outputs for H₂S, SO₂, ratio, or air-demand signals
Communications & Outputs
Industrial digital communications for DCS or PLC integration
Calibration
Zero and span validation using certified gases
Hazardous-area configuration
Project-specific certified configuration
Availability
Coming Soon — anticipated Q4 2026
Development notice

Product information shown on this page is preliminary. Final measurement ranges, accuracy, response time, optical configuration, ratio calculation, air-demand output, sample-conditioning requirements, utilities, communications, hazardous-area approvals, dimensions, and installation arrangements will be published before commercial release.

Industrial Use

Applications and industries.

Typical Applications

Claus sulfur recovery unit ratio monitoringH₂S-to-SO₂ ratio controlSulfur recovery unit tail-gas controlMain combustion-air optimizationTrim-air control and process adjustmentSulfur recovery efficiency improvementSRU process-stability monitoringTail-gas treatment unit inlet monitoringH2S / SO2 Ratio MeasurementSulfur Ratio / Air-Demand ControlSulfur Recovery & Tail Gas Monitoring

Industries Served

Natural Gas & LNGPetrochemicalsRefiningSulfur Recovery & Gas Treating
Project Delivery

Project Integration & Support Scope

Blue Dragon reviews the measurement objective, interfaces, documentation, commissioning, and lifecycle requirements as part of project configuration. The scope below identifies the principal items to confirm before order placement.

Measurement Objective
Continuous H2S and SO2 measurement with real-time H2S-to-SO2 ratio calculation for Claus sulfur recovery control, trim-air optimization, and optional air-demand or ratio-control output.
Signal Outputs
The planned system provides configurable 4-20 mA outputs for H2S, SO2, ratio, and air-demand or ratio-control signals where configured. Final output count, scaling, relays, and digital interfaces are project specific.
Data Integration
The analyzer is intended for DCS or PLC integration using industrial analog and digital communications. Ratio-control logic, standard tags, alarms, historian data, and control ownership must be defined in the approved project documents.
Alarms & Diagnostics
Final concentration and ratio alarms, analyzer faults, sample-system diagnostics, calibration status, relay logic, and fail-safe behavior will be defined by the approved datasheet and ordered configuration.
Documentation
The final project package is expected to include the approved datasheet, sample-system and heat-trace drawings, utility schedule, I/O list, communication information, calibration procedures, hazardous-area documents where applicable, and FAT or SAT records.
Commissioning Support
Planned commissioning includes heated sample-system checks, leak and flow verification, zero and span validation, H2S and SO2 output checks, ratio and control-signal verification, alarm testing, DCS mapping, response checks, and operator training.
Lifecycle Support
Planned lifecycle support includes heated sample-system components, filters, valves, detector or optical components, calibration gases, heat tracing, troubleshooting, spare parts, repairs, and long-term technical assistance.
Online Analyzer Configuration

Sample System & Online Analyzer Readiness

Reliable online measurement depends on the process interface as well as the analyzer. Confirm the following application data before final configuration and quotation.

Sample Type & Phase
Conditioned gas from a Claus sulfur recovery unit tail-gas or associated tail-gas treatment process, containing H2S and SO2 and potentially water vapor, sulfur vapor, acid gases, particulates, and other process components.
Measurement Range
Provide normal, minimum, maximum, startup, and upset concentrations for H2S and SO2, the required H2S-to-SO2 ratio range, alarm limits, and any air-demand or control-output range. Final ranges remain project specific until the approved datasheet is issued.
Sample Conditions
Provide process pressure, temperature, moisture, sulfur-vapor and condensation risk, dust, oxygen, acid-gas composition, hydrocarbons, ammonia or other interferents, and startup and upset conditions.
Sample Handling
Define extraction point, probe, heated transport, filtration, temperature control, pressure and flow regulation, condensation prevention, calibration routing, sample return or safe vent, and maintenance access.
Installation Area
Confirm analyzer shelter or cabinet, heat-traced routing, ambient conditions, maintenance access, safe-area or hazardous-area classification, certification, and proximity to the control-system interface.
Utilities
Confirm electrical and heat-trace power, instrument air or purge, certified zero and span gases, calibration manifold, safe vent or return, drains where applicable, and communication cabling.
Response Requirement
Define whether the analyzer supports ratio display, main or trim-air optimization, closed-loop or advisory control, alarm response, efficiency monitoring, or trending. Final response time is configuration dependent.
Integration Requirement
Confirm 4-20 mA outputs for H2S, SO2, ratio, and air demand where required, digital communication, DCS or PLC tags, historian data, control-loop ownership, alarm logic, and fail-safe behavior.
Commissioning Requirement
Verify heated extraction and transport, leak integrity, sample temperature and flow, zero and span response, H2S and SO2 outputs, ratio calculation, air-demand or control signal, analog and digital communications, alarms, loop behavior, and handover documents.
Application Engineering

Plan the application before commercial release.

Share the sample, measurement range, operating conditions, project location, and timeline. Blue Dragon Technology will review the application and recommend the appropriate configuration.

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Product Family

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