YOKOGAWA WE430 User manual

User’s
Manual Model WE430
Hydrazine Analyzer
IM 12Y18A03-01EN
IM 12Y18A03-01EN
1st Edition

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IM 12Y18A03-01EN 1st Edition : Oct. 04, 2019-00
uIntroduction
Thank you for purchasing the WE430 Hydrazine Analyzer.
This Instructor’s Manual contains all essential information for the user to make full use of WE430.
Please read the following respective documents before installing and using the WE430.
The related documents are listed as follows.
General Specications
Contents Document number Note
Model WE430 Hydrazine Analyzer GS 12Y18A03-01EN Online manual
“EN” in the document number is the language code.
User’s Manual
Contents Document number Note
WE410, WE420, WE430, WE440
WET CHEMISTRY ANALYZER
Safety Precautions and Protection of Environment
IM 12Y18A00-01EN Attached to the product
(printed manual)
Model WE430 Hydrazine Analyzer IM 12Y18A03-01EN Online manual (This manual)
“EN” in the document number is the language code.
An exclusive User’s Manual might be attached to the products whose su󰀩x codes or option
codes contain the code “Z” (made to customers’ specications). Please read it along with this
manual.
You can download the latest documents from our website. Scan QR code.
http://www.yokogawa.com/an/WE400/download/
Media No. IM 12Y18A03-01EN 1st Edition : Oct. 2019 (YK)
All Rights Reserved Copyright © 2019, Yokogawa Electric Corporation

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IM 12Y18A03-01EN 1st Edition : Oct. 04, 2019-00
n Notes on Handling User’s Manuals
• Please provide the user’s manuals to your end users so that they can keep the user’s
manuals for convenient reference.
• Please read the information thoroughly before using the product.
• The purpose of these user’s manuals is not to warrant that the product is well suited to any
particular purpose but rather to describe the functional details of the product.
• No part of the user’s manuals may be transferred or reproduced without prior written
consent from YOKOGAWA.
• YOKOGAWA reserves the right to make improvements in the user’s manuals and product at
any time, without notice or obligation.
• If you have any questions, or you nd mistakes or omissions in the user’s manuals, please
contact our sales representative or your local distributor.
n Drawing Conventions
Some drawings may be partially emphasized, simplied, or omitted, for the convenience of
description.
Some screen images depicted in the user’s manual may have di󰀨erent display positions or
character types (e.g., the upper / lower case). Also note that some of the images contained in this
user’s manual are display examples.
n Trademark Acknowledgments
• All other company and product names mentioned in this user’s manual are trademarks or
registered trademarks of their respective companies.
• We do not use TM or ® mark to indicate those trademarks or registered trademarks in this
user’s manual.

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IM 12Y18A03-01EN 1st Edition : Oct. 04, 2019-00
u Safety Precautions
n Safety, Protection, and Modication of the Product
• In order to protect the system controlled by the product and the product itself and ensure
safe operation, observe the safety precautions described in this user’s manual. We assume
no liability for safety if users fail to observe these instructions when operating the product.
• If this instrument is used in a manner not specied in this user’s manual, the protection
provided by this instrument may be impaired.
• If any protection or safety circuit is required for the system controlled by the product or for
the product itself, prepare it separately.
• Be sure to use the spare parts approved by Yokogawa Electric Corporation (hereafter
simply referred to as YOKOGAWA) when replacing parts or consumables.
• Modication of the product is strictly prohibited.
• The following safety symbols are used on the product as well as in this manual.
WARNING
This symbol indicates that an operator must follow the instructions laid out in this manual in order
to avoid the risks, for the human body, of injury, electric shock, or fatalities. The manual describes
what special care the operator must take to avoid such risks.
CAUTION
This symbol indicates that the operator must refer to the instructions in this manual in order to
prevent the instrument (hardware) or software from being damaged, or a system failure from
occurring.
CAUTION
This symbol gives information essential for understanding the operations and functions.
NOTE
This symbol indicates information that complements the present topic.
This symbol indicates Protective Ground Terminal.
n Warning and Disclaimer
The product is provided on an “as is” basis. YOKOGAWA shall have neither liability nor
responsibility to any person or entity with respect to any direct or indirect loss or damage arising
from using the product or any defect of the product that YOKOGAWA can not predict in advance.

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u CE marking products
n Authorized Representative in EEA
The Authorized Representative for this product in EEA is Yokogawa Europe B.V. (Euroweg 2,
3825 HD Amersfoort, The Netherlands).
n Identication Tag
This manual and the identication tag attached on packing box are essential parts of the product.
Keep them together in a safe place for future reference.
n Users
This product is designed to be used by a person with specialized knowledge.
n How to dispose the batteries:
This is an explanation about the EU Battery Directive. This directive is only valid in the EU.
Batteries are included in this product. Batteries incorporated into this product cannot be removed
by yourself. Dispose them together with this product.
When you dispose this product in the EU, contact your local Yokogawa Europe B.V.o󰀩ce.
Do not dispose them as domestic household waste.
Battery type: Manganese dioxide lithium battery
Notice: The symbol (see above) means they shall be sorted out and collected as ordained in the
EU Battery Directive.

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Model WE430
Hydrazine Analyzer
CONTENTS
IM 12Y18A03-01EN 1st Edition
uIntroduction....................................................................................................i
u Safety Precautions ......................................................................................iii
u CE marking products..................................................................................iv
1. General Information ................................................................................. 1-1
1.1 Principles of Operation .................................................................................... 1-2
1.2 Principles of Calibration................................................................................... 1-4
1.2.1 Dynamic Two Point Calibration (DYN)............................................... 1-4
1.2.2 O󰀪ine Calibration .............................................................................. 1-4
1.3 Fluidics Diagram ............................................................................................... 1-5
1.4 Glossary............................................................................................................. 1-5
2. Analyzer Preparation ............................................................................... 2-1
2.1 Mounting and Plumbing Instructions............................................................. 2-1
2.2 Electrical Wiring................................................................................................ 2-3
2.3 Wiring the Analyzer........................................................................................... 2-4
2.3.1 Terminal Assignments........................................................................ 2-6
2.3.2 Electrode Wiring Assignments........................................................... 2-6
2.4 Installation of Reagent and Di󰀨usion Tubing ................................................ 2-6
2.5 Installation of New Electrode Cables.............................................................. 2-7
2.6 Installation of a New Iodide Electrode ............................................................ 2-7
2.7 Installation of ATC Probe ................................................................................. 2-8
2.8 Installation of a New Reference Electrode ..................................................... 2-9
3. Analyzer Operation .................................................................................. 3-1
3.1 Use of the Setup Mode ..................................................................................... 3-3
3.2 Setup Mode Overview ...................................................................................... 3-4
3.3 Shutdown and Start-Up Procedure............................................................... 3-25
4. Calibration................................................................................................. 4-1
4.1 Calibration Setup .............................................................................................. 4-1
4.2 Dynamic Calibrator Operation......................................................................... 4-2
4.3 Dynamic Calibrator and Syringe Setup.......................................................... 4-3
4.4 Performing a DYN Calibration ......................................................................... 4-3
4.5 Calibration Error Codes ................................................................................... 4-5
4.6 Calibration At Custom Concentrations Using DYN ...................................... 4-6
4.7 Dynamic Calibrator Check ............................................................................... 4-7

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4.8 O󰀪ine Calibration Procedure.......................................................................... 4-7
5. Analyzer Maintenance ............................................................................. 5-1
5.1 Maintenance Schedule..................................................................................... 5-1
5.2 Weekly Maintenance......................................................................................... 5-1
5.3 Bi-Weekly Maintenance.................................................................................... 5-1
5.4 Monthly Maintenance ....................................................................................... 5-2
5.4.1 Calibration.......................................................................................... 5-2
5.4.2 Replacement of Sample Inlet Filter.................................................... 5-2
5.4.3 Polish Iodide Electrode ...................................................................... 5-2
5.4.4 Air Pump Check ................................................................................. 5-2
5.4.5 Replacement of Reagent and Di󰀨usion Tubing Assembly ................ 5-2
5.5 Yearly Preventive Maintenance ....................................................................... 5-4
5.5.1 Electrodes .......................................................................................... 5-4
5.5.2 O-ring Replacement........................................................................... 5-4
5.5.3 Replacement of Restrictor Tubing ..................................................... 5-4
6. Troubleshooting ....................................................................................... 6-1
6.1 Diagnostics Mode ............................................................................................. 6-1
6.1.1 Calibration Log................................................................................... 6-1
6.1.2 Error List............................................................................................. 6-2
6.1.3 Measurement Log.............................................................................. 6-2
6.1.4 Status Log .......................................................................................... 6-3
6.1.5 Software Revision.............................................................................. 6-3
6.1.6 Electronics Serial Number ................................................................. 6-3
6.1.7 mV and Noise Measurements ........................................................... 6-3
6.1.8 mA Output Values .............................................................................. 6-3
6.1.9 Display Test........................................................................................ 6-3
6.1.10 Keypad Test ....................................................................................... 6-4
6.2 Slope Problems................................................................................................. 6-5
6.2.1 Low Slope .......................................................................................... 6-5
6.2.2 High Slope.......................................................................................... 6-5
6.2.3 Troubleshooting Matrix ...................................................................... 6-6
6.3 Error/Event Codes ............................................................................................ 6-7
6.4 Resetting the Analyzer ..................................................................................... 6-9
6.4.1 Hard Reset....................................................................................... 6-10
6.4.2 Serial Number and Software Revision............................................. 6-10
Revision Record.......................................................................................................i

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1. General Information
This user guide covers the operation, maintenance and troubleshooting for the WE430 Hydrazine
analyzer, which o󰀨ers unmatched reliability in analyzing oxygen scavengers in feedwater, boiler
water or at the economizer inlet.
nIntroduction
Analyzer the oxygen scavenger content at points in the steam/water circuit where dissolved
oxygen control is critical. Residual oxygen scavengers must be carefully monitored to prevent
costly overdosing, yet allow enough of the reductant in the system for metal passivation.
Excess levels of certain oxygen scavengers decompose into ammonia, which increases system
alkalinity. E󰀩cient control of oxygen scavengers depends on maintaining a predetermined safety
zone. The WE430 Hydrazine analyzer optimizes the uidic design with the sensing technology
to provide accurate and precise results with an almost instantaneous indication of oxygen
scavenger concentration changes.
The WE430 Hydrazine analyzer meets all of the criteria for accurate and dependable oxygen
scavenger monitoring and more. The WE430 analyzer incorporates innovative technologies that
include:
• Premium electrodes
• Marquee help screen
• Pump-less reagent addition and dynamic calibration system
l Markets
• Power
• Pulp and paper
• Chemical / petrochemical
l Applications
• Boiler water
• Feedwater
• Hydrazine
• Carbohydrazide
• DEHA and others
n Features and Benets
The WE430 Hydrazine analyzer is ideal for measuring and monitoring the critical oxygen
scavenger levels in feedwater, boiler water or economizer inlet. With limited maintenance
requirements and low reagent usage, the WE430 analyzer provides the highest level of
performance with easy of use.
• Measurement of oxygen scavenger concentrations in water using premium ion selective
electrode (ISE) technology.
• Accurate and precise measurements in the range of 0 ppb to 200 ppb for hydrazine:
• Reliable measurements and a wide measurement range with selectable resolution.
• Measures oxygen scavenger activity in aqueous solutions quickly, accurately and
economically.
• Premium reference and sensing electrodes:
• Superior accuracy and stability over a wide temperature range.
• Advanced ow cell design:
• Automatic sample handling and contamination control with no moving parts.
• Patented scrolling marquee:
• Intuitive menu-driven, digital user interface.
• Data log of previous measurements and calibration:
• View measurement, calibration and error history.

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• Self diagnostics:
• Ease of maintainability.
• Password protection:
• Security and peace of mind for your operation.
• Auto-ranging electronics with an easy to read backlit LCD display:
• Analyzer determines the best range.
n Application Modes
The versatility of the WE430 Hydrazine analyzer allows the operator to set the analyzer to read
hydrazine, depending on the oxygen scavenger to be measured. Refer to Section 3.1, Use of the
Setup Mode for instructions on how to set the analyzer to read hydrazine.
lHydrazine Application
Hydrazine Measuring Range: 0 ppb to 200 ppb as hydrazine
In high pressure boiler systems, hydrazine is added to react with dissolved oxygen present in the
system and a small amount of residual hydrazine is left behind. The residual hydrazine ensures
that small amounts of dissolved oxygen that enters the system through leakage will be removed.
Residual hydrazine should be carefully monitored to prevent costly overdosing.
Excess hydrazine may also decompose into ammonia, which increases sample alkalinity and
attacks copper alloy components. E󰀩cient control of hydrazine depends on maintaining a
predetermined safety zone – typically 10 to 50 ppb.
1.1 Principles of Operation
The sample enters the WE430 Hydrazine analyzer and passes through the inlet valve, bypass/
needle valve, inlet lter, pressure regulator, ow meter and into the restrictor tubing. The sample
then passes through the uid connector block into a reagent bottle and through a di󰀨usion tubing
assembly where pH adjustment takes place and iodine is added. The pH-adjusted sample then
ows back through the connector block into the reagent mixing loop where the oxygen scavenger
in the sample mixes with iodine reagent to form iodide. The sample then passes the iodide
electrode, reference electrode and temperature probe and ows into an atmospheric drain via the
diverter valve.

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IM 12Y18A03-01EN 1st Edition : Oct. 04, 2019-00
Figure 1.1 WE430 Schematic
The oxygen scavenger present in the sample reacts with the iodine to form iodide ion:
OSred + X • I2 → 2X • I-+ OSox
Where:
OSred = oxygen scavenger reduced
OSox = oxygen scavenger oxidized
The iodide sensing electrode responds logarithmically to changes in the resulting iodide ion
concentration. This response is described by the Nernst equation:
E = Eo+ 2.3 (RT/nF) log (C/Ciso)
Where:
E = measured electrode potential, mV
Eo= potential, when C equals Ciso, mV
R = ideal gas constant
T = temperature of sample, degrees K
n = valence of ionic species (-1 for iodide ion)
F = Faraday’s constant
C = e󰀨ective iodide concentration (activity)
Ciso= concentration (activity) of iodide ion where potential E is temperature independent
(isopotential point)
E0default: 44 mV
Low limit of E0: - 50 mV
High limit of E0: + 150 mV
Slope default: - 64.0 mV/decade
Slope range: - 75.0 mV/decade to - 40.0 mV/decade