WDG-V Combustion Analyzer

THERMOX Model  WDG-V Combustion Analyzer
Prevention is easy. Living through a disaster isn't.

The reliable identification of low combustion oxygen in a fired heater or boiler has always been critical to the effectiveness of the Burner Management System for proper control and safety.

Low emission burners and aggressive firing control points to achieve increased efficiency and emission reductions have driven the industry to tighter control measures, which hold a greater potential for combustion events. Reducing the risk of a combustion event has become a priority and has led to the implementation of Safety Instrumented Systems (SIS). This additional layer of safety is added to the Basic Process Control System.

The WDG-V Combustion Analyzer has been designed to provide an additional layer of safety with the measurement of excess O2, Combustibles and Methane and by using these measurements to ensure the safe operation of the Burner Management System.

  • Precise control of low O2 setpoints with confidence
  • CO detection for control interlocks and safety shutdown
  • Predictive diagnostics
  • SIL 2 Capable for SIS implementation of IEC 16508/61511
AMEVision Display Unit
The AMEVision Display Unit enables the convenience of site calibration and communication with the analyzer via MODBUS RTU, TCP/IP Fast Ethernet via RJ45, USB port, and 4.2" VGA display.

  • End of life prediction of cell and combustibles detectors
  • Stability Indicator during the calibration process
  • Trend data logging
  • Cell enclosure and electronics temperature monitoring
  • Videos +

  • Specifications +

    Principle of Operation (O2) Zirconium oxide for net oxygen measurement and dual hot-wire catalytic detectors for both combustibles and methane.


    Output Range (O2) Oxygen: From 0-1 to 0-100%
    Combustibles: 0-1000 PPM with Overrange 0-2,000 PPM to 0-10,000 PPM, 0-2 to 0-5%
    Hydrocarbon: 0-5%
    Accuracy (O2) ±0.75% of measured value or ±0.05%, whichever is greater
    Combustibles: ±2% of full scale output range
    Hydrocarbon: ±5% of full scale output range
    Response Oxygen: 90% of a step change < 11 seconds with Flame Arrestors
    Combustibles & Hydrocarbon: 90% of a step change < 20 seconds with Flame Arrestors
    Aspirator Air Requirements 3 SCFH Typical at 3 to 6 psig, Instrument air or Nitrogen
    Analog Output Three isolated linear current outputs for O2, combustibles and hydrocarbon. Each output can be 4-20 mA, 0-20 mA, 20-4 mA or 20-0 mA and is fully scalable. NAMUR Configurable. Hold or track during calibration. Max. load 1200 Ω
    Alarms Set relays to energize or de-energize on alarm
    Contact Rating 0.5A, 30V, 10VA max. non-inductive load, AC or DC
    Digital Communication 2 wire MODBUS RTU, 57.6 KBaud
    Configuration MODBUS RTU, AMETEK configuration software, or AMEVision HMI
    Diagnostics Low Sample Flow, Cell & Detector age tracking, Cell resistance, Calibration required, Analog current verification
    Calibration Calibrate or verify calibration. Stored calibration and verification data. Selectable calibration gas run time and process recovery time. Timed automatic calibration with optional Remote Calibration Unit.
    Sample Pressure ±6 in. water gauge
    Max. Sample Dewpoint 392°F (200°C)
    Max. Flue Gas Temp. / Probe Type / Lengths 1300°F (704°C) / 316 SS / 36” - 108”(91 cm - 274 cm)
    1875°F (1024°C) / 310 SS / 36” - 108”(91 cm - 274 cm)
    3000°F (1648°C) / Hexoloy® / 24” - 72” (60 cm - 182 cm)
    Environment Ambient Temp.: -25°C to 65°C
    Relative Humidity: 5% to 95%, non-condensing
    Enclosure Hinged IP65 (NEMA 4X), weather resistant, stainless steel, explosion-proof, purged, and floor mount versions available.
    UL Class I, Div II, Gp B, C, D or ATEX Zone 2, T3 with Purge
    Power Requirements 115 VAC, ±10%, 47-63 Hz, 740 VA max.; 230 VAC, ±10%, 47-63 Hz, 740 VA max.
    Calibration Gas Requirements Use calibration gases @ 10 psig, 1.5 SCFH (0.7 L/min.)

    O2 Span Gas: Air or from 1.0% to 100% O2, balance N2
    O2, Comb. & CH4 Zero Gases: From 0.1 to 10% O2, balance N2
    Comb. Span Gas: 60 to 80% (PPM ranges) or 40% to 60% (% ranges) of the selected comb. recorder output range in certified equal mixtures of CO + H2, 3-4% O2, balance N2
    Hydrocarbon Span Gas: 2% CH4, 8% to 10% O2, balance N2
  • Documents +

  • Certifications +

    • Hinged IP65 (NEMA 4X)
    • Intertek Class I, Div II, Gp B, C, D or ATEX Zone 2, T3 with Purge
    • SIL 2