Thermox WDG-V - Combustion Analyzer

Offering safe, reliable operation through continual diagnostic checks and proactive alarms, the analyzer provides an additional layer of safety in burner management systems in a versatile, completely field-serviceable solution designed for SIL-2. 

The WDG-V has a close-coupled extractive design, delivering fast responses in flue gases up to 1648^oC (3000^oF). Zirconium oxide measures oxygen and catalytic detectors measure combustibles and methane.  An integral flow sensor assures sample system integrity.

The WDG-V series is ideal for a wide range of markets, including cement and lime, hydrocarbon processing, metals and mining, pharmaceutical, and power and steam generation.  Commonly used in process heaters, steam boilers and thermal oxidizers.

RELIABLE OPERATION
The WDG-V series is designed with measurement redundancy and continual diagnostic functions that assess the health of the instrument and validate the proper combustion measurements. This provides a low probability of failure, ensuring maximum reliability.

ENHANCED SAFETY
Designed for SIL-2, continual diagnostic checks allow the analyzer to send out alerts while in operation.  Service alarms inform the control system or safety implemented system (SIS) if inspection or service is required.

FIELD SERVICEABLE
All components are easily serviceable without having to remove the analyzer from the process flange. Online diagnostics allow users to monitor detector health for proactive maintenance.  Ethernet connection allows remote performance monitoring for maintenance LANs or asset management systems (AMS).
 
The WDG-V series is the comprehensive solution for combustion control and safety – Find out more.

• Precise control of low O₂ setpoints with confidence
• Combustibles and hydrocarbon detection for control interlocks and safety shutdown
• Predictive diagnostics
• SIL 2 capable for SIS implementation of IEC 16508/61511
• Integral flow sensor verifies sample system integrity
• Completely field-serviceable

• 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:
  Five independent, NO 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: 10% to 90%, 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, 1950 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