Ametek Process Instruments - THERMOX

- Model WDG-V Zone1 - Analyzer



The Model WDG-V Zone 1 analyzer offers a complete solution for combustion process control and safety with redundancy and diagnostics that provide end users with digitally transmitted information via Modbus and Ethernet that can be used to implement predictive and proactive Asset Management maintenance programs.

The THERMOX® Model WDG-V Zone 1 combustion analyzer from AMETEK Process Instruments has been third-party certified for Zone 1 hazardous locations, allowing the unit to operate in areas in which hazardous vapors and gases will continuously be present.

  • The Model WDG-V Zone 1 analyzer provides a complete solution for combustion control and safety
  • The new enclosure design is certified for IEC Zone 1 requirements
  • It is an integral unit with no purge required, self contained housing provides a new layer of safety
  • Measurements of O2, COe and Hydrocarbon in one unit

WDG-V Zone 1 Combustion Analyzer

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

Output Range (O2): Oxygen:

From 0-1 to 0-100%
Combustibles: 0-500 PPM to 0-5%
Methane: 0-5%

Accuracy (O2):

±0.75% of measured value or ±0.05%, whichever is greater
Combustibles: ±2% of full scale output range

Response: Oxygen: 90% of a step change < 11 seconds with Flame Arrestors
Combustibles: 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


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)


Ambient Temp.: -30°C to 65°C
Relative Humidity: 5% to 95%, non-condensing


Threaded IP65 (NEMA 4X), weather resistant, aluminum with white powder coat, EXd flame proof
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, 3 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


Ex II 2G Exd IIC T3 Gb / IECEx ETL 16.0028X.

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