WDG IV ATEX0 pages

ATEX II 3 G WDG-IV Series

THERMOX

®

PROCESS INSTRUMENTS

Close-coupled aspirated analyzers for measurement of oxygen,
combustibles and methane in flue gas streams up to 1648°C.
The WDG-IV series analyzers mount directly on the combustion process and
are designed for direct measurement in high temperature flue gas applications
such as fired heaters and furnaces, but are equally at home on boilers and
other lower temperature applications These analyzers are suitable for gas
streams up to 704°C using the standard 316SS probe/filter assembly. Flue gas
temperatures up to 1648°C can be measured using optional high temperature
probes. For corrosive gas streams, sample wetted parts in Hastelloy® or Inconel® are available. The analyzers can be provided with separate control unit
(Series 2000) or integral on-board electronics (Smart Sensors) and are offered
in a range of mounting styles. Optional combustibles and methane detectors
are available for optimal control of the combustion process.
ATEX II 3 G MODELS
SERIES 2000 BASED

SMART SENSOR VERSIONS

WDG-IV Oxygen

WDG IV/IQ Oxygen

WDG-IVC Oxygen and Combustibles

WDG IVC/IQ Oxygen and Combustibles

WDG-IVCM Oxygen, Combustibles & Methane

WDG IVM/IQ Oxygen and Methane
WDG IVCM/IQ Oxygen, Combustibles & Methane

SENSOR SECTION
Principle of Operation: Zirconium oxide for net oxygen
measurement and hot-wire type catalytic detectors for both
combustibles and methane.
Output Range:
Oxygen: From 0-1 to 0-100%
Combustibles: From 0-2,000 ppm to 0-10,000 ppm or from
0-2% to 0-5%
Methane: 0-2% to 0-5%
Accuracy:
Oxygen: ± 0.75% of measured value or ±0.05% O2, whichever is greater
Combustibles: ± 2% of full scale output range
Methane: ± 5% of full scale output range
Response:
Oxygen: 90% of a step change < 30 secs.
Aspirator Air Requirements: 4.72 to 9.4 L/min. at 1.05 to
7.04 kg/cm2
Max. Flue Gas Temp. / Probe Material / Lengths:
704°C / 316 SS / 91 cm - 274 cm
1024°C / 310 SS / 91 cm - 274 cm
1648°C / Hexoloy® / 60 cm - 182 cm
Max. Sample Dewpoint: 200°C
Sample Pressure: Subatmospheric
Purge Flow During Rapid Exchange Period:
340 L/min.
Purge Flow During Normal Operation: 30.2
L/min.

Environment:
Ambient Temp.: -20°C to 60°C
Relative Humidity: 10% to 90%, non-condensing
Enclosure: NEMA 4X (IP65) hinged stainless steel wall
mount; optional floor mount.
Calibration Gas Requirements: For sensors without flame

arresters use calibration gases @ 10 PSIG, 1.5 SCFH (0.7 L/min.)
For sensors with flame arresters use calibration gases @ 10 PSIG,
2 SCFH (1 L/min.)
Note: Flame arresters are standard in all certified Div. 2 and ATEX
analyzers

O2 Span Gas: Air or from 1.0% to 100% O2, balance N2

O2, Comb. & CH4 Zero Gases: From 0.1 to 10% O2
(2% recommended), balance N2

Comb. Span Gas: 800 ppm CO, 800 ppm H2, 2 to 4%
O2, balance N2 (for a 0 - 2000 ppm combustibles range)

CH4 Span Gas: 2% CH4, 8% to 10% O2, balance N2

SYSTEM COMPLIANCE:
EMC Compliance: 2004/108/EC
Electronics Safety Compliance: 73/23/EEC
ATEX Directive 94/9/EC

TYPE APPROVAL (LCIE 05 ATEX 6140 X and LCIE 05 ATEX 6140 X / 02)
Hand Held IQ Link

II 3 G Ex iL IIC T4 Gc

-20°C ≤ Ta ≤ 70°C

Wall Mount IQ Link

II 3 G Ex nA IIC T4 Gc

-20°C ≤ Ta ≤ 70°C

Series 2000 Control Unit

II 3 G Ex nA IIC T3 Gc

-10°C ≤ Ta ≤ 50°C

WDG...

II 3 G Ex pZ IIC T3 Gc

-20°C ≤ Ta ≤ 60°C

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