Ametek WDG-V UOP User manual

WDG-V UOP Combustion Analyzer
ATEX-IECEx
USER MANUAL
PN 9000-280-VE_Rev C

To obtain a PDF of this manual, visit our Products page at www.ametekpi.com.
Copyright Notice © 2021 AMETEK Process Instruments. All rights reserved.
The information and descriptions in this document are the sole property of AMETEK Process Instruments and may not be copied, reproduced, disseminated, or
distributed without explicit written permission from AMETEK Process Instruments.
The statements, congurations, technical data, and recommendations in this document are believed to be accurate and reliable at the time of this publication,
but AMETEK Process Instruments assumes no responsibility or liability for any errors or inaccuracies that may appear in this document.
AMETEK Process Instruments is not responsible for any infringement of patents or other rights of third parties that may result from the use of this document. The
content of this document is furnished for informational purposes only, is subject to change without notice, and does not represent a commitment or guaranty by
AMETEK Process Instruments.
AMETEK Process Instruments makes no warranty, express or implied, with respect to the content of this document. AMETEK Process Instruments shall not be
liable for any loss or damage, including consequential or special damages, resulting from any use of this information, even if loss or damage is caused by AMETEK
Process Instruments as a result of negligence or any other fault.

PN 9000-280-VE, Rev B
Contents
Safety Notes.................................................................................................................................................vi
Electrical Safety ..........................................................................................................................................vi
Grounding....................................................................................................................................................vi
Personnel and Equipment Safety Information...............................................................................vii
Special Conditions for Safe Use....................................................................................................ix
HAZARDOUS LOCATION LIMITATIONS.................................................................................ix
Warning Labels ....................................................................................................................................x
Environmental Information – WEEE.....................................................................................................x
OVERVIEW .........................................................................................................................1-1
UOP CCR Platforming Process............................................................................................................1-1
History.................................................................................................................................................1-1
CCR (Continuous Catalyst Regeneration) ........................................................................1-1
Thermox and WDG UOP Series...........................................................................................1-3
About the WDG-V UOP Analyzer .......................................................................................................1-4
Basic Elements of the Analyzer..................................................................................................1-5
Analyzer I/O............................................................................................................................. 1-5
Analyzer Communications.................................................................................................. 1-5
How the Oxygen Measuring Cell Works .................................................................................1-6
Measuring Non-Combustible Gases .................................................................................1-7
Hydrocarbons in the Gas Sample.......................................................................................1-7
About the Analyzer Sample System..................................................................................................1-8
About the Analyzer Electronics ........................................................................................................1-10
Communicating With the Analyzer ................................................................................................1-11
Working in This Manual..................................................................................................................... 1-12
Supplemental Information – Where Can I Find It?................................................................... 1-12
INSTALLATION AND START-UP............................................................................................2-1
Safety Considerations ...........................................................................................................................2-1
Pre-Installation Requirements ...........................................................................................................2-2
Personnel Technical Level Required for Installation...........................................................2-2
Storage Prior to Installation ........................................................................................................2-2
Analyzer Site Preparation.............................................................................................................2-2
Unpacking and Inspecting the Equipment...........................................................................2-3
Tools, Equipment, and Supplies Required
for Installation..................................................................................................................................2-3
Installing the Mechanical Components..........................................................................................2-4
Installing the Sample Inlet Probe..............................................................................................2-4
Installing the Standard 1/4" NPT Probe............................................................................2-4
Contents | iii

PN 9000-280-VE, Rev B
Installing the Exhaust Tube (Optional)....................................................................................2-6
Installing the Analyzer ..................................................................................................................2-7
Calibration/Aspirator Air ..............................................................................................................2-9
Required Calibration Gases and Tubing...........................................................................2-9
Flow Calibration.....................................................................................................................2-9
Rapid Exchange Purge System ............................................................................................... 2-10
Connections ..........................................................................................................................2-10
Purging Operation – “Safe” Pressure...............................................................................2-10
Purging Instructions............................................................................................................2-12
Aspirator and Manual Calibration Connections ............................................................... 2-13
Aspirator N2Connections...................................................................................................2-13
Manual Calibration...................................................................................................................... 2-14
Remote Calibration Unit Installation (Optional)...............................................................2-14
Installing the AMEVision Display User Interface....................................................................... 2-16
AC Power and Signal Connections................................................................................................2-17
General Wiring and Conduit Requirements .......................................................................2-17
WDG-V UOP AC Mains Supply Connections ......................................................................2-20
EMC Grounding, Shielding and Noise Protection.........................................................2-21
EMC Grounding Method ....................................................................................................2-21
Transient and RFI Interference..........................................................................................2-22
Current Output Connections................................................................................................... 2-23
Standard Current Outputs.................................................................................................2-23
Alarm Contact Connections..................................................................................................... 2-24
Standard Alarm Connections ...........................................................................................2-24
Remote Calibration Unit (RCU) Connections.....................................................................2-25
Oxygen-Only Remote Calibration Unit Connections ..................................................2-25
Digital Input to Initiate Remote Calibration Unit.........................................................2-25
Notes About Ducting ................................................................................................................. 2-26
Installing the User Interface/Communications Options........................................................ 2-27
Installing the PC Congurator Software (Typical Communication Option)...........2-27
Setting the Analyzer Address Using the Dip Switch (to Enable
Communications Between the Analyzer and the PC Congurator Software) ......2-27
Connecting the PC to the Analyzer..................................................................................2-28
Installing the AMEVision Display User Interface (Secondary Communication
Option).............................................................................................................................................2-29
Setting the Analyzer Address Using the Dip Switch (to Enable
Communications Between the Analyzer and the AMEVision Display User
Interface Unit).......................................................................................................................2-30
Connecting Analyzers to the AMEVision Display Unit ................................................... 2-31
Connecting a Single Analyzer...........................................................................................2-31
Connecting Multiple Analyzers.........................................................................................2-31
Final Daisy Chain Connection Conguration Setting.................................................2-32
Customer I/O Connections...............................................................................................................2-33
Replacing a WDG-IV UOP Analyzer With a WDG-V UOP Analyzer...........................2-34
AMEVision Communication Troubleshooting Checks ................................................2-36
No Communications ...................................................................................................2-36
Intermittent Communications ..................................................................................2-36
iv | WDG-V UOP ATEX-IECEx Combustion Analyzer

PN 9000-280-VE, Rev B
MAINTENANCE AND TROUBLESHOOTING.........................................................................3-1
Aftermarket Excellence and Long-Term Commitment to Safety and Quality ..................3-2
Requesting Technical Support...................................................................................................3-3
Requesting Authorization to Return Equipment ................................................................3-3
Spare Parts Lists.......................................................................................................................................3-4
WDG-V UOP Analyzer Spare Parts.............................................................................................3-4
Remote Calibration Unit (RCU) Parts .......................................................................................3-5
Diagnostics Flowcharts.........................................................................................................................3-6
Thermocouple Checks ..................................................................................................................3-6
Calibration/Aspirator Air Setup Checks ..................................................................................3-7
AC Power Checks ............................................................................................................................3-8
Furnace Checks................................................................................................................................3-8
Process Pressure Checks (only if above 2 PSIG)....................................................................3-9
Cell Checks ........................................................................................................................................3-9
Maintenance.......................................................................................................................................... 3-10
Cleaning and Replacing Parts ................................................................................................. 3-10
Cleaning and Replacing Parts in the Measuring Cell......................................................3-10
Replacing the Thermocouple.................................................................................................. 3-12
Replacing the Flow Sensor.......................................................................................................3-14
Replacing the Furnace ............................................................................................................... 3-15
Replacing the Box Heater .........................................................................................................3-16
Replacing the Sensor Board.....................................................................................................3-19
Recommended Maintenance.......................................................................................................... 3-20
Calibration...................................................................................................................................... 3-20
Safety Considerations ................................................................................................................3-20
Troubleshooting........................................................................................................................... 3-21
General Troubleshooting ...................................................................................................3-21
Leak Check .....................................................................................................................3-21
Sning for Leaks ..........................................................................................................3-21
Pressurizing for Leaks..................................................................................................3-22
Plugged Plumbing Check...........................................................................................3-22
Alarm and Warning Messages......................................................................................................... 3-23
Alarms.............................................................................................................................................. 3-23
Warnings.........................................................................................................................................3-30
SPECIFICATIONS....................................................................................................................4-1
WDG-V UOP Analyzer Specications...............................................................................................4-2
Remote Calibration Unit (RCU) Specications .............................................................................4-3
Approvals and Certications ..............................................................................................................4-4
WDG-V UOP Analyzer Directives and Standards.................................................................4-4
WDG-V UOP Analyzer Marking ..................................................................................................4-4
Remote Calibration Unit (RCU) Directives and Standards ...............................................4-5
WDG-V UOP Series Analyzer Rating Labels...................................................................................4-6
Contents | v

PN 9000-280-VE, Rev B
Safety Notes
WARNINGS, CAUTIONS, and NOTES contained in this manual emphasize critical
instructions as follows:
Important information that should not be overlooked.
An operating procedure which, if not strictly observed, may result in personal
injury or environmental contamination.
An operating procedure which, if not strictly observed, may result in damage
to the equipment.
Burn hazard. Hot surface. Do not touch, allow to cool before servicing.
Electrical Safety
High voltages are present in the analyzer housings. Always shut down power source(s)
before performing maintenance or troubleshooting. Only a qualied electrician should
make electrical connections and ground checks.
Any use of the equipment in a manner not specied by the manufacturer may impair
the safety protection originally provided by the equipment.
Grounding
Instrument grounding is mandatory. Performance specications and safety protection
are void if instrument is operated from an improperly grounded power source.
Verify ground continuity of all equipment before applying power.
vi | WDG-V UOP ATEX-IECEx Combustion Analyzer

PN 9000-280-VE, Rev B
Personnel and Equipment Safety Information
This section describes important safety information to avoid personal injury and dam-
age to the equipment while installing, operating, maintaining, or servicing the equip-
ment. All safety regulations, standards, and procedures at the analyzer location must
be followed.
All personnel involved with the installation, start-up, operation, maintenance, service, or
troubleshooting of the analyzer must review and follow these Warnings and Cautions.
Do Not Operate without Covers
To avoid electric shock or re hazard, do not operate this product with covers
or panels removed.
Use Caution When Lifting
Use caution when lifting the analyzer from its crate.
Use Proper Attire
Equipment is hot, user should wear protective groves while handling the
equipment.
Use Proper Wiring
To avoid re hazards, use only the wiring specied in the “Installation and
Start-Up” chapter of this manual.
Avoid Electrical Overload
To avoid electrical shock or re hazard, do not apply a voltage to a terminal
that is outside the range specied for that terminal.
Ground the Product
Follow the grounding instructions provided in the “Installation and Start-Up”
chapter of this manual. Before making connections to the input or output
terminals of this product, ensure that the product is properly grounded.
Contents | vii

PN 9000-280-VE, Rev B
Use Proper Fuse
To avoid re hazard, use only the fuse type and rating specied for this prod-
uct.
Use Proper Power Source
Do not operate this product from a power source that applies more than the
voltage specied.
Do Not Operate with Suspected Failures
If you suspect there is damage to this product, have it inspected by qualied
service personnel.
viii | WDG-V UOP ATEX-IECEx Combustion Analyzer

PN 9000-280-VE, Rev B
Special Conditions for Safe Use
The WDG-V UOP is designed to be used in Category 3 hazardous locations where
explosive gases may be present. Protection against explosion is provided by purge
technique. There are four rules that must always be followed:
1. Do not open the enclosure unless the power is removed from both sensor and
control unit for 90 minutes while maintaining pressurization, or the area is demon-
strated to be non-hazardous.
2. Perform purge system maintenance as described in Chapter 2 of this manual.
3. Use only appropriate approved conduit ttings or cable glands for cable entry
(IIC, IP40 minimum). No holes shall be left unplugged.
4. Internal temperature rises above the rated T-class. The end user must take immedi-
ate action on the loss of pressure to reinstate purge.
HAZARDOUS LOCATION LIMITATIONS
The WDG-V UOP is a Category 3 analyzer specically designed and certied for use
in ATEX II 3 G and IECEx hazardous locations. It can be safely operated in a location in
which:
• No gases are present with a higher probability of ignition than hydrogen (e.g.,
acetylene).
• The ambient temperature does not exceed 60 °C.
• Voltages are 104–127 VAC or 207–253 VAC, 740 VA.
Make sure the location in which the WDG-V is installed meets all of the Haz-
ardous Location Limitation criteria for a Category 3 analyzer described above.
Contents | ix

PN 9000-280-VE, Rev B
Warning Labels
These symbols may appear on the instrument in order to alert you of existing condi-
tions.
Protective Conductor Terminal
(BORNIER DE L’ECRAN DE PROTECTION)
Schutzerde
Caution – Risk of electric shock
(ATTENTION – RISQUE DE DÉCHARGE ÉLECTRIQUE)
Achtung – Hochspannung Lebensgefahr
Caution – Refer to accompanying documents
(ATTENTION – SE RÉFERER AUX DOCUMENTS JOINTS)
Achtung – Beachten Sie beiliegende Dokumente
CAUTION – Hot Surface
(ATTENTION – SURFACE CHAUDE)
Achtung – Heiße Oberäche
Environmental Information – WEEE
This AMETEK product contains materials that can be reclaimed and recycled. In some
cases the product may contain materials known to be hazardous to the environ-
ment or human health. In order to prevent the release of harmful substances into the
environment and to conserve our natural resources, AMETEK recommends that you
arrange to recycle this product when it reaches its“end of life.”
Waste Electrical and Electronic Equipment (WEEE) should never be disposed of in a
municipal waste system (residential trash). The Wheelie Bin marking on this product is
a reminder to dispose of the product properly after it has completed its useful life and
been removed from service. Metals, plastics, and other components are recyclable and
you can do your part by doing one of the following steps:
• When the equipment is ready to be disposed of, take it to your
local or regional waste collection administration for recycling.
• In some cases, your“end of life” product may be traded in for
credit towards the purchase of new AMETEK instruments. Contact
your dealer to see if this program is avail-able in your area.
• If you need further assistance in recycling your AMETEK product,
contact us through our Customer Support page at https://www.
ametekpi.com/customersupport/requestsupport.
x | Thermox®WDG-V UOP ATEX-IECEx Analyzer

PN 9000-280-VE, Rev B
Overview
UOP CCR Platforming Process
“The CCR Platforming process uses naphtha boiling in the range of 180–400 °F
to produce high-octane gasoline or petrochemical precursors. This technology
is the world’s leading reforming process. It is also the technology of choice for
new reforming applications, providing reners with proven, ultra-low-pressure
(50 PSIG reactor pressure) operation and producing the highest reforming
yields.
In gasoline applications, the Platforming process produces high-octane
reformate for unleaded gasoline blending to make higher-octane grades of
gasoline. In reformulated gasoline applications, the low-pressure, low-severity
Platforming process restores a renery’s hydrogen balance by maximizing the
yield of hydrogen, even at the required low-octane severities. With appropriate
prefractionation, the process produces the low-benzene, low-vapor-pressure
material mandated by reformulated gasoline.”
World Wide Web page (no author)
CCR Platforming Process
uop.com – 2002, April 10
History
The semi-regenerative Platforming process, introduced by UOP in 1949, was
the rst catalytic reforming process to use platinum-coated catalysts. Advances
continuously improved the process, and in 1972, UOP introduced the Platform-
ing process with CCR (Continuous Catalyst Regeneration).
CCR (Continuous Catalyst Regeneration)
CCR Platforming incorporates a moving catalyst bed that allows catalyst to be
added or removed from the reactor while the unit is operating. Spent catalyst
from the reactor ows to the regeneration tower where the carbon is burned
o and the catalyst is reconditioned. Regenerated catalyst is returned to the
top of the reactor stack.
Overview |1-1

PN 9000-280-VE, Rev B
Fresh
Catalyst
Catalyst
Regenerator
Stacked
Reactor
Combined Feed
Exchanger
Naphtha Feed
from Treating
Fired Heaters
Recovery
Station
Fuel Gas
Light Ends
Stabilizer
C
6
Aromatics
Net H
2
Rich Gas
Net Gas
Compressor
Separator
Naphtha Feed
from Treating
CCR Platforming Process.
Catalytic reaction causes coke to be deposited on the catalyst as it moves
through the reactors, degrading its performance. Once in the regenerator,
the coke is burned o the catalyst. However, the resulting high temperature
greatly increases the risk of permanent damage to the catalyst and so the com-
bustion must be controlled. This is done by controlling the oxygen content.
The catalyst is the key ingredient used in the catalytic reforming process and
oxygen measurement is critical to this process. It is essential that the oxygen
analyzer function accurately and be easy to service and maintain.
A major benet of the of the UOP CCR process is that the catalytic reforming
process can run uninterrupted. Other catalyst regeneration methods require
a shutdown of the process which is costly and defeats the purpose of the
UOP-type system. The oxygen analyzer is critical to the UOP-patented CCR
process and designed specically to monitor oxygen levels during catalyst
regeneration.
1-2 | Thermox®WDG-V UOP ATEX-IECEx Analyzer

PN 9000-280-VE, Rev B
Thermox and WDG UOP Series
1980 Thermox, in conjunction with the UOP Process Division, developed
the WDG-III UOP to monitor the gaseous atmosphere during a
regeneration cycle of UOP’s Licensed Continuous Catalyst Regen-
eration process. With their technical guidance this analyzer evolved
to the current model WDG-IV UOP/RP.
1999 UOP and Thermox addressed plugging and corrosion issues with
the external sample return line which is outside the scope of
our supply. The revised UOP Project Specication 630 allows the
close-coupled, nitrogen-aspirated, return-to-process design of the
Thermox model WDG-IV UOP/RP (or an in-situ probe design) to be
used to measure oxygen content of the process. This eliminated
the need for the external sample return line and the sample ow
sensor used to check for plugging in the return line that were part
of the WDG-III and WDG-IV UOP analyzer designs. Since the process
piping of the CCR is 316 stainless steel, and the process was adjust-
ed to include nitrogen blanketing at shutdown, UOP decided that
Hastelloy C was no longer mandatory for the process-wetted parts.
The standard analyzer is now constructed of 316 SS, but Hastel-
loyC is still available as an option.
2007 Thermox added an option to the WDG-IV UOP to include isolation
valves on the inlet and outlet process connections. This option
allows for maintenance of the WDG-IV UOP analyzer without shut-
ting down the process.
2019 Thermox updated the instrument’s electronics package and
renamed the product WDG-V UOP. The new electronics package
includes additional diagnostics and meets the ROHS compliance
directive. The AMEVision Controller replaces the Series 2000 Con-
troller for the instrument as well. It includes a color LED display and
additional communications options.
Overview |1-3

PN 9000-280-VE, Rev B
About the WDG-V UOP Analyzer
Designed for fast response in a wide range of ue gas applications, the analyz-
er mounts directly on the combustion process to provide continuous measure-
ment of oxygen.
A sample is drawn from the process stream by means of an air-operated
aspirator and is immediately returned to the process. A portion of this gas rises
past the oxygen measuring Cell and returns to the primary loop. All sample
wetted parts are heated to 200 °C to maintain the sample above the dewpoint
of the gas.
Follow these precautions when working on the analyzer:
Do not turn on the aspirator until the analyzer has been turned on
and is hot – preferably 24 hours. Also, if you turn o the analyzer or
the process is shut down, turn o the aspirator air to avoid plugging
problems.
Remove AC power from the analyzer and allow it to cool for at least
90 minutes before performing any maintenance or troubleshooting
activities.
The outside of the analyzer cover and all analyzer assembly compo-
nents are hot during normal operation (up to 260 °C/500 °F inside
the cover). Allow analyzer components to cool for at least 90 minutes
before working inside the analyzer. Use caution and wear appropriate
gloves when handling components or when touching the analyzer
cover.
1-4 | Thermox®WDG-V UOP ATEX-IECEx Analyzer

PN 9000-280-VE, Rev B
Basic Elements of the Analyzer
The WDG-V UOP analyzer is a complete standalone unit; no separate controller
is required. The unit consists of three basic systems:
• Plumbing
Includes all inlet and outlet tubing, O2Cell Housing, the calibration gas
inlet and aspirator assembly, ow sensor, and the aspirator used to pull the
sample into the analyzer.
• Measuring System
Includes the oxygen Cell and ow sensor.
• Temperature System
Includes the electrical Cell heater (furnace), sensor case heaters, the TypeK
Thermocouple (maintains Cell operating temperature). The sensing Cell
operates at a constant temperature. The WDG-V is a complete standalone
unit. No separate controller is required.
Analyzer I/O
All required I/O comes with the analyzer. See the section“About the Analyzer
Electronics”for descriptions.
Analyzer Communications
The analyzer is congured, calibrated and monitored using the MODBUS RTU
interface. AMETEK provides two options for communicating with the analyzer:
• AMEVision Display User Interface
• WDG-V UOP Congurator Software via PC (standard with each unit)
The interface is industry standard MODBUS which allows customized
user software. Contact the factory for the MODBUS register denitions.
Overview |1-5

PN 9000-280-VE, Rev B
How the Oxygen Measuring Cell Works
The sensing element is a closed-end tube made from ceramic zirconium oxide
stabilized with an oxide of yttrium or calcium. Porous platinum coatings on the
inside and outside serve as both a catalyst and as electrodes. At high tempera-
tures (generally above 650 °C/1200 °F), oxygen molecules coming in contact
with the platinum electrodes near the sensor become ionic.
• As long as the oxygen partial pressures on either side of the Cell are equal,
the movement is random and no net ow of ions occurs.
• If, however, gases having dierent oxygen partial pressures are on either
side of the Cell, a potentiometric voltage is produced. The magnitude of
this voltage is a function of the ratio of the two oxygen partial pressures.
• If the oxygen partial pressure of one gas is known, the voltage produced
by the Cell indicates the oxygen content of the other gas. A reference gas,
usually air (20.9 % O2), is used for one of the gases.
Figure 1-1.
Zirconium oxide Cell principle
of operation.
1-6 | Thermox®WDG-V UOP ATEX-IECEx Analyzer

PN 9000-280-VE, Rev B
The voltage of the Cell depends on temperature, and so the Cell is maintained
at a constant temperature. The oxygen content is then determined from the
Nernst equation:
E = In
RT
4F
O1
O2
where Rand Fare constants, Tis absolute temperature, and O1and O2are the
oxygen partial pressures on either side of the Cell.
Measuring Non-Combustible Gases
For measuring oxygen in non-combustibles gases, the calibration of an ana-
lyzer is obtained using the formula:
AT = 48.0 at 680°C
E = A*T*Log 20.9%
O2Unk%
Where Ais a constant, Tis the Cell temperature on an absolute scale (°C +273)
and O2Unk% is the unknown oxygen concentration of the gas to be analyzed,
and which is calculated by the analyzer.
The Cell produces zero voltage when the same amount of oxygen is on both
sides. Voltage increases as the oxygen concentration of the sample decreas-
es. The voltage created by the dierence in the sample gas and the reference
air is transmitted to the microprocessor control unit and linearized to an
output signal.
Hydrocarbons in the Gas Sample
When hydrocarbons are present in a gas sample, a combustion process occurs
when the sample is exposed to the high temperature of the Zirconia Cell. If the
oxygen reading is lower than expected, it may be an indication that hydrocar-
bons are present.
The amount of oxygen reduction is dependent on the type of hydro-
carbons present in the sample gas.
Overview |1-7

PN 9000-280-VE, Rev B
About the Analyzer Sample System
The WDG-V UOP was designed for meeting the purpose of low level oxygen
measurement during the regeneration cycle in which coke deposits are re-
moved from the catalyst by oxidation. The WDG-V UOP analyzer has a specially
treated Zirconium Oxide Cell which is used to survive the destructive eects of
halogen-oxidation.
The analyzer uses a nitrogen-operated aspirator to draw a sample of gas from
the catalyst regenerator. A portion of this gas passes over the Zirconia Cell. Be-
cause the aspirator gas contains no oxygen, the sample can simply be returned
to the process.
Figure 1-2.
Typical WDG-V UOP Analyzer
conguration.
1-8 | Thermox®WDG-V UOP ATEX-IECEx Analyzer

PN 9000-280-VE, Rev B
The major components of the sample system and other key components and
their functions are detailed below (see Figures 1-2 and 1-3). The components
listed below are for a variety of analyzer conguration possibilities. The sample
system consists of:
Component Function
RTD Flow Sensor The RTD ow sensor monitors the sample ow through the fast
loop as well as the temperature of the gas owing past it.
An alarm is generated when the temperature reaches 100 °C
lower than the temperature set during normal operation. This
alarm indicates that ow has slowed or stopped.
Temperature Zones and
Heaters
The temperature zones in the analyzer are tightly controlled by
the oxygen Cell temperature heater. The Cell heater is a 300 W
coil heater surrounding the Cell Housing and providing precision
heat to the oxygen Cell.
The box temperature is controlled with an RTD mounted on
the aspirator block. The box heater consists of two (2) 150 W
cartridge heaters located in the aluminum heater block at the
bottom of the aspirator. This heater provides the heat for the
enclosure to maintain all plumbing components above 225 °C.
Cell Temperature:
The oxygen Cell is controlled to 680 °C. The Cell temperature is
measured by dual Type “K”thermocouples. Dual thermocouples
are used for self-check of the Cell temperature. The thermocou-
ples are side-by-side in a single assembly. There is no distinction
between the two thermocouples.
Flame Arrestors The WDG-V UOP analyzer contains two ame arrestors to
prevent the analyzer from becoming an ignition source for the
process when there are short periods of high combustible levels
(25 % of LEL – Lower Explosive Limit) in the process. The ame
arrestors are not, however, intended to protect the process when
the combustibles’ levels are constantly high.
Figure 1-3.
RTD Flow Sensor.
Overview |1-9

PN 9000-280-VE, Rev B
About the Analyzer Electronics
Component Function
General • Connections to the analyzer are made through the Wiring
board. The Wiring board is located on the right side in a sepa-
rate section of the analyzer.
• Analyzer wiring and customer wiring (power, I/O) are directly
connected to the main electronics.
• All connections can be plugged and headers are laser-printed
for easy matching.
• The conguration monitoring interface is RS-485 MODBUS
RTU.
I/O All required I/O comes with the analyzer:
• Three (3) congurable 4–20 mA outputs
• Two (2) system alarm relays (Service and Data Valid)
• Three (3) congurable process alarm relays
• One (1) RS-485, 2-wire, MODBUS RTU interface (57.6K baud)
Current Outputs There are three (3) current outputs on the WDG-V UOP Analyzer.
Refer to“Current Output Connections”in Chapter 2 for details.
Optional Remote Calibra-
tion Unit (RCU)
The RCU provides maximum condence in the accuracy and
stability of all WDG combustion analyzers, by simplifying the cali-
bration/verication process. Unattended automatic or manual
gas sequence calibration is provided with hard-piped bottle-to-
analyzer connections to minimize time and labor costs.
Refer to“Remote Calibration Unit (RCU) Connections”in
Chapter2 for details on these connection options.
1-10 | Thermox®WDG-V UOP ATEX-IECEx Analyzer