YOKOGAWA FLXA202 User manual

User’s
Manual FLXA202 / FLXA21
2-Wire Analyzer
Start-up Manual
IM 12A01A02-12E
IM 12A01A02-12E
10th Edition
This Start-up Manual explains mainly the installation and wiring of the FLXA202/FLXA21.
For detailed information and other information, the User’s Manual of the FLXA202/FLXA21
should be referred to.

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IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
uIntroduction
Thank you for purchasing the FLXATM202/FLXATM21 2-Wire Analyzer.
Please read the following respective documents before installing and using the FLXA202/FLXA21.
When the FLXA21 with the output of FOUNDATION Fieldbus or PROFIBUS PA Communication
is used, please refer to the User’s Manual, IM 12A01A02-71E or IM 12A01A02-72E, too.
The related documents are as follows.
General Specications
Contents Document number Note
FLXA202 2-wire Analyzer GS 12A01A03-01EN For FLXA202. Online manual
FLXA21 2-wire Analyzer GS 12A01A02-01E For FLXA21. Online manual
FLXA21 2-wire Analyzer
FOUNDATION Fieldbus Communication GS 12A01A02-71E For FLXA21. Online manual
FLXA21 2-wire Analyzer
PROFIBUS PA Communication GS 12A01A02-72E For FLXA21. Online manual
* the “E” or “EN” in the document number is the language code.
User’s Manual
Contents Document number Note
FLXA202/FLXA21 2-wire Analyzer
Start-up Manual IM 12A01A02-12E Attached to the product
FLXA202/FLXA21 2-wire Analyzer
Safety Precautions IM 12A01A02-20E
For intrinsic safety, nonincendive and Type n.
Attached to the product
FLXA202/FLXA21 2-wire Analyzer
Installation and Wiring IM 12A01A03-01EN Online manual (This manual)
FLXA202/FLXA21 2-wire Analyzer
Operation of pH/ORP IM 12A01A03-31EN For pH/ORP (-P1) selection Online manual
FLXA202/FLXA21 2-wire Analyzer
Operation of SC IM 12A01A03-32EN For Conductivity (SC) (-C1) selection Online manual
FLXA202/FLXA21 2-wire Analyzer
Operation of ISC IM 12A01A03-33EN
For Inductive conductivity (ISC) (-C5) selection
Online manual
FLXA202/FLXA21 2-wire Analyzer
Operation of DO IM 12A01A03-34EN For Dissolved oxygen (DO) (-D1) selection Online manual
FLXA202 2-wire Analyzer Operation of
SENCOM SA-pH/ORP IM 12A01A03-36EN For pH/ORP of SENCOM SA (-S5) selection Online manual
FLXA202 2-wire Analyzer
Operation of SENCOM SA-SC IM 12A01A03-37EN
For Conductivity (SC) of SENCOM SA (-S5)
selection
Online manual
FLXA21 2-wire Analyzer
FOUNDATION Fieldbus Communication IM 12A01A02-71E For FLXA21, output “-F” Online manual
FLXA21 2-wire Analyzer
PROFIBUS PA Communication IM 12A01A02-72E For FLXA21, output “-P” Online manual
* The “E” or “EN” in the document number is the language code.
Note: Please read the Safety Precautions (IM 12A01A02-20E) before using the product.
 TheSafetyPrecautionsincludesControlDrawingsofintrinsicsafety,nonincendiveandTypenthatdescribesspeciccondition
forusingFLXA202/FLXA21inhazardous/classiedlocation.
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.
Technical Information
Contents Document number Note
FLXA202 2-wire Analyzer
Selection Guide for Intrinsic Safety type Associated Apparatus TI 12A01A02-42EN Online manual
FLXA202/FLXA21 2-Wire Analyzer
HART Communication TI 12A01A02-60E Online manual
* The “E” or “EN” in the document number is the language code.
You can download the latest documents from our website. Scan QR code.
http://www.yokogawa.com/an/xa202/download/
Read corresponding user’s manual for details about sensors or other related products.
No. IM 12A01A02-12E 10th Edition : Jan. 2021 (YK)
All Rights Reserved Copyright © 2010, Yokogawa Electric Corporation

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IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
n Note on Handling User’s Manuals
• Please hand over the user’s manuals to your end users so that they can keep the user’s
manuals on hand 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 Copyright and Trademark Notices
FLEXA, FLXA and SENCOM are trademarks or registered trademarks of Yokogawa Electric
Corporation.
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.
n Product Disposal
The instrument should be disposed of in accordance with local and national legislation/regulations.
n Warranty and service
Yokogawa products and parts are guaranteed free from defects in workmanship and material
under normal use and service for a period of (typically) 12 months from the date of shipment from
the manufacturer.
Individual sales organisations can deviate from the typical warranty period, and the conditions of
sale relating to the original purchase order should be consulted. Damage caused by wear and
tear,inadequatemaintenance,corrosion,orbythee󰀨ectsofchemicalprocessesareexcluded
from this warranty coverage.
In the event of warranty claim, the defective goods should be sent (freight paid) to the service
department of the relevant sales organisation for repair or replacement (at Yokogawa discretion).
The following information must be included in the letter accompanying the returned goods:
• Part number, model code and serial number
• Original purchase order and date
• Length of time in service and a description of the process
• Description of the fault, and the circumstances of failure
• Process/environmental conditions that may be related to the failure of the device.
• A statement whether warranty or nonwarranty service is requested
• Complete shipping and billing instructions for return of material, plus the name and phone
number of a contact person who can be reached for further information.
Returnedgoodsthathavebeenincontactwithprocessuidsmustbedecontaminated/
disinfectedbeforeshipment.Goodsshouldcarryacerticatetothise󰀨ect,forthehealthand
safety of our employees.
Material safety data sheets should also be included for all components of the processes to which
the equipment has been exposed.

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IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
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 Function Ground Terminal. Do not use this terminal as the 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.
nFLXA202/FLXA21
• The FLXA202/FLXA21 should only be used with equipment that meets the relevant IEC,
American, Canadian, and Japanese standards. Yokogawa accepts no responsibility for the
misuse of this unit.
• Don’t install “general purpose type” instruments in the hazardous area.
• The Instrument is packed carefully with shock absorbing materials, nevertheless, the
instrument may be damaged or broken if subjected to strong shock, such as if the
instrument is dropped. Handle with care.

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IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
CAUTION
Electrostatic discharge
The FLXA202/FLXA21 contains devices that can be damaged by electrostatic discharge.
When servicing this equipment, please observe proper procedures to prevent such damage.
Replacement components should be shipped in conductive packaging. Repair work should
be done at grounded workstations using grounded soldering irons and wrist straps to avoid
electrostatic discharge.
CAUTION
• Do not use an abrasive or organic solvent in cleaning the instrument.
• Substitution of components may impair suitability for Division 2.
Do not remove or replace while circuit is live unless area is known to be non hazardous.
Explosion Hazard – Do not disconnect equipment unless area is known to be non
hazardous.
Do not reset circuit breaker unless power has been removed from the equipment or the area
is known to be non hazardous.
• This instrument is a EN61326-1 Class A product, and it is designed for use in the industrial
environment. Please use this instrument in the industrial environment only.
• TheHARTcommunicationmaybeinuencedbystrongelectromagneticeld.
In this case another trial of the HART communication and/or operation with FLXA202/
FLXA21 touch screen can be carried out.
• When you open the front panel, make sure the screws are completely out of the screw
holes, and then open the front panel slowly in order not to damage the threaded parts on
the housing. If the threaded parts are damaged and the screws cannot be tightened, the
waterproof performance will deteriorate.
• When checking whether ORP meter is functioning properly by using the concentrated
sulfuric acid, handle it with care.
lSafety, EMC and RoHS Compliance (FLXA202/FLXA21)
Safety: UL 61010-1
UL 61010-2-030
CAN/CSA-C22.2 No.61010-1
CAN/CSA-C22.2 No.61010-2-030
EN61010-1
EN61010-2-030
EMC: EN61326-1 Class A, Table 2 (For use in industrial locations)
   Inuenceofimmunityenvironment(CriteriaA):Outputshiftisspeciedwithin±25%ofF.S.
EN61326-2-3
  EN61326-2-5(su󰀩xcodeOutput:-F,-P)
RCM: EN61326-1 Class A, Table 2
Korea Electromagnetic Conformity Standard Class A 한국 전자파적합성 기준
A급 기기 (업무용 방송통신기자재)
이 기기는 업무용(A급) 전자파적합기기로서 판매자 또는
사용자는 이 점을 주의하시기 바라며, 가정외의 지역에서
사용하는 것을 목적으로 합니다.
   Russian:TRCU020/2011(su󰀩xcodeOutput:-A)
RoHS: EN 50581: 2012 (FLXA202; Style 1.02 or newer, FLXA21; Style 3.03 or newer)
Installation altitude: 2000 m or less
Category based on IEC 61010: I (Note 1)
Pollution degree based on IEC 61010: 2 (Note 2)
Note1: Installationcategory,calledover-voltagecategory,speciesimpulsewithstandvoltage.
Equipment with “Category I” (ex. two-wire transmitter) is used for connection to circuits in which measures are taken
to limit transient over-voltages to an appropriately low level.
Note 2: Pollution degree indicates the degree of existence of solid, liquid, gas or other inclusions which may reduce
dielectric strength. Degree 2 is the normal indoor environment.

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IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
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.
nInformation of the WEEE Directive
Thisproductispurposelydesignedtobeusedinalargescalexedinstallationsonlyand,
therefore, is out of scope of the WEEE Directive. The WEEE Directive does not apply.
This product should be disposed in accordance with local and national legislation/regulations.
The WEEE Directive is only valid in the EU.
u Control of Pollution Caused by the Product
This is an explanation for the product based on “Control of Pollution caused by Electronic
Information Products” in the People’s Republic of China.
产品中有害物质的名称及含量
部件名称
有害物质
铅
(Pb) 汞 (Hg) 镉 (Cd) 六价铬 (Cr (VI)) 多溴联苯 (PBB) 多溴二苯醚 (PBDE)
外壳(金属) ××××○○
外壳(塑料) ××××○○
印刷电路板组件 ××××○○
○： 表示该有害物质在该部件中所有均质材料中的含有量都在GB/T26572所规定的限量要求以下。
×： 表示该有害物质至少在该部件的某一均质材料中的含有量超出GB/T26572所规定的限量要求。
环保使用期限: 这个标志是基于SJ/T11364，在中国（不包括台湾，香港，澳门）贩售的电子电
器产品所适用的环保使用期限。
只要遵守产品上关于安全及使用上的注意事项，从制造之日起计算在该年限
内，不会发生制品内的有害物质外泄，突然变异，对环境或人体以及财产产生
重大影响的情况。
（注） 该年限是《环境保护使用期限》，不是产品的保质期限。
另外，关于替换部件的推荐替换周期，请阅读使用说明书。

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IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
u Explosion Protected Type Compliance
FLXA202, FLXA21 (Output: -A)
Item Description 'Type' in
MS code
Europe
(ATEX)
FLXA202 and FLXA21: [Intrinsic safety “ia”]
Applicable Standard: EN 60079-0: 2012 + A11: 2013, EN 60079-11: 2012 -CB
International
(IECEx)
FLXA202 and FLXA21: [Intrinsic safety “ia”]
Applicable Standard: IEC 60079-0: 2011, IEC 60079-11: 2011
United
States (FM)
FLXA202 and FLXA21: [Intrinsically safe / Nonincendive]
Applicable Standard: FM 3600:2018, FM 3610:2018,
FM 3611:2018, FM 3810:2005,
NEMA 250: 2014, ANSI/ISA 60079-0: 2013,
ANSI/ISA 60079-11: 2014 -CD
Canada
(CSA)
FLXA202 and FLXA21: [Intrinsically safe / Nonincendive]
Applicable Standard: C22.2 No.0-10 (R2015), CAN/CSA-C22.2 No.94-M91 (R2011),
C22.2 No.213-M1987 (R2013), CAN/CSA-C22.2 No.60079-0:11,
CAN/CSA-C22.2 No.60079-11:14, CAN/CSA-C22.2 No.61010-1-12,
CAN/CSA-C22.2 No.61010-2-030-12
United
States (FM)
FLXA202 and FLXA21: [Nonincendive]
Applicable Standard: FM 3600:2018, FM 3610:2018, FM 3810:2005, NEMA 250: 2014
-DD
Canada
(CSA)
FLXA202 and FLXA21: [Nonincendive]
Applicable Standard: C22.2 No.0-10 (R2015), CAN/CSA-C22.2 No.94-M91 (R2011),
C22.2 No.213-M1987 (R2013), CAN/CSA-C22.2 No.61010-1-12,
CAN/CSA-C22.2 No.61010-2-030-12
Canada
(CSA)
FLXA202: [Type of protection 'n' / Nonincendive]
Applicable Standard: C22.2 No.0-10 (R2015), CAN/CSA-C22.2 No.94-M91 (R2011),
C22.2 No.213-M1987 (R2013), CAN/CSA-C22.2 No.60079-0:11,
CAN/CSA-C22.2 No.60079-11:14, CAN/CSA-C22.2 No.60079-15:12,
CAN/CSA-C22.2 No.61010-1-12, CAN/CSA-C22.2 No.61010-2-030-12
-DE
Europe
(ATEX)
FLXA202: [Type of protection 'n']
Certicate: Not Applicable as per Annex VIII to ATEX 2014/34/EU
Applicable Standard: EN 60079-0: 2012 + A11:2013, EN 60079-11: 2012,
EN 60079-15: 2010, EN 60529: 1991+A2:2013 -DB
International
(IECEx)
FLXA202: [Type of protection 'n']
Applicable Standard: IEC 60079-0: 2011, IEC 60079-11:2011, IEC 60079-15: 2010
China
(NEPSI)
FLXA202 and FLXA21: [Intrinsic safety “ia”]
Applicable Standard: GB3836.1-2010, GB3836.4-2010, GB 3836.20-2010 -CH
Korea
(KOSHA)
FLXA202: [Intrinsic safety “ia” ]
Applicable Standard: Notice of Ministry of Labor No. 2016-54 -CG
FLXA21: [Intrinsic safety “ia”]
Applicable Standard: Notice of Ministry of Labor No. 2016-54 -EG
FLXA21 (Output: -F, -P)
Item Description 'Type' in
MS code
Europe
(ATEX)
[Intrinsic safety “ia”]
Applicable Standard: EN 60079-0: 2012 + A11: 2013, EN 60079-11: 2012 -CB
International
(IECEx)
[Intrinsic safety “ia”]
Applicable Standard: IEC 60079-0: 2011, IEC 60079-11: 2011
United
States (FM)
[Intrinsically safe / Nonincendive]
Applicable Standard: FM 3600:2018, FM 3610:2018, FM 3611:2018, FM 3810:2005,
NEMA 250: 2014, ANSI/ISA 60079-0: 2013, ANSI/ISA 60079-11: 2014
-CD
Canada
(CSA)
[Intrinsically safe / Nonincendive]
Applicable Standard: C22.2 No.0-10 (R2015), CAN/CSA-C22.2 No.94-M91 (R2011),
C22.2 No.213-M1987 (R2013), CAN/CSA-C22.2 No.60079-0:11,
CAN/CSA-C22.2 No.60079-11:14, CAN/CSA-C22.2 No.61010-1-12,
CAN/CSA-C22.2 No.61010-2-030-12
United
States (FM)
[Nonincendive]
Applicable Standard: FM 3600:2018, FM 3610:2018, FM 3810:2005,NEMA 250: 2014
-DD
Canada
(CSA)
[Nonincendive]
Applicable Standard: C22.2 No.0-10 (R2015), CAN/CSA-C22.2 No.94-M91 (R2011),
C22.2 No.213-M1987 (R2013), CAN/CSA-C22.2 No.61010-1-12,
CAN/CSA-C22.2 No.61010-2-030-12
China
(NEPSI)
[Intrinsic safety “ia”]
Applicable Standard: GB3836.1-2010, GB3836.4-2010, GB 3836.20-2010 -CH
Korea
(KOSHA)
[Intrinsic safety “ia”]
Applicable Standard: Notice of Ministry of Labor No. 2016-54 -EG

<Start-up manual> 8
IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
1. Instrument Check
Upon delivery, unpack the instrument carefully and inspect it to ensure that it was not damaged
during shipment. If damage is found, retain the original packing materials (including the outer
box)andthenimmediatelynotifythecarrierandtherelevantYokogawasaleso󰀩ce.
n Checking the model and su󰀩x code
lFLXA202
Makesurethemodelandsu󰀩xcodeonthenameplatea󰀩xedtotheleftsideofthehousing.
Make sure they match the information in your order. Be sure to apply correct power to the unit as
detailed on the nameplate. Refer to table 2.
NOTE
Be sure to apply correct power to the unit , as detailed on the nameplate.
-D-B-D-AB-P1-P1
-A-N-LA-N-N/U/H6
Figure 1.1 Inside of the FLXA202 and example of nameplate
lFLXA21
Makesurethemodelandsu󰀩xcodeonthenameplatea󰀩xedtotheleftsideorinsideofthe
housing. Refer to table 3.
-D-P-D-CB-P1-NN-A-N-LA-N-NN
/UM/SCT
S3.02
2016.01
C2RA12345
S3.02
2016.01C2RA12345
-D-P-D-AA-P1-NN-A-N-LA-N-NN
/UM/SCT/H6
Figure 1.2 Example of nameplate (FLXA21)
l Checking the accessories
Make sure the accessories in Table 1 are included.
Table 1 Accessories
Product Name Quantity Remark
Cable glands FLXA202 3 sets One rubber plug attachement.
FLXA21 3 or 4 sets 4 sets when 2 sensors are used.
One grommet for grounding attachement.
pH analyzer
(-P1)
Jumper 2 pcs/module
Grommet set 1 set/module
SENCOM
SA (-S5)
Grommet 1
Accessory 11 shield bracket, 2 screws, 2 ferrite cores, 2 wiring bands
Option Bracket 1 set Option code /UM*, /U, /PM
Sun shade hood 1 set Option code /H6, /H7, /H8
Tag plate 1Option code /SCT
Adapter for conduit
work
3 or 4 sets Option code /CB4, /CD4, /CF4
4sets when FLXA21 are used.
Startup Manual 1 copy This manual
Safety Precautions 1 copy
*: The universal mounting kit (/UM) contains the brackets for both /U and /PM options.

<Start-up manual> 9
IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
Table 2 Model and su󰀩x code (FLXA202)
Model Su󰀩x code Option code Description
FLXA202 ······················································· ··············· 2-Wire Analyzer
Power supply -D ··············· Always -D
Housing -B
-C
-D
···············
···············
···············
Aluminum alloy cast + urethane coating
Aluminum alloy cast + epoxy coating
Aluminum alloy cast + high anti-corrosion coating
Display -D ··············· Anti-glare LCD
Type -AB
-AD
-AG
-AQ
-AR
-CB
-CD
-CF
-CG
-CH
-CQ
-CR
-DB
-DD
-DE
···············
···············
···············
···············
···············
···············
···············
···············
···············
···············
···············
···············
···············
···············
···············
General purpose for CE, RCM
General purpose for CSA
General purpose for KC
General purpose for EAC with PA
General purpose for EAC
IS for ATEX, IECEx
IS for FM, CSA
IS for TIIS
IS for KOSHA
IS for NEPSI
IS for EAC with PA
IS for EAC
Type n for ATEX, IECEx
NI for FM, CSA
Type n for CSA
1st input -P1
-C1
-C5
-D1
-S5
···············
···············
···············
···············
···············
pH/ORP
Conductivity (SC)
Inductive conductivity (ISC)
Dissolved oxygen (DO)
SENCOM SA (SSA)
2nd input -NN
-P1
-C1
-D1
···············
···············
···············
···············
Without input
pH/ORP
Conductivity (SC)
Dissolved oxygen (DO)
Output -A ··············· 4-20 mA + HART
—-N ··············· Always -N
Language set -LA ··············· English and 11 languages
Country -N
-J
···············
···············
Global except Japan
Japan
—-NN ··············· Always -NN
Option Mounting hardware
Hood
Tag plate
Conduit adapter
Measurement law
/UM
/U
/PM
/H6
/H7
/H8
/SCT
/CB4
/CD4
/CF4
/CB5
/CD5
/CF5
/K
Universal mounting kit
Pipe and wall mounting hardware
Panel mounting hardware
Hood, stainless steel
Hood, stainless steel + urethane coating
Hood, stainless steel + epoxy coating
Stainless steel tag plate
G1/2 x 3 pcs
1/2NPT x 3 pcs
M20 x 1.5 x 3 pcs
G1/2 x 3 pcs for Type n
1/2NPT x 3 pcs for Type n
M20 x 1.5 x 3 pcs for Type n
WithMeasurementLawcerticate

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IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
Table 3 Model and su󰀩x code (FLXA21)
Model Su󰀩x code Option code Description
FLXA21 ······································································ 2-Wire Analyzer
Power supply -D ··············· Always -D
Housing -P ··············· Plastic
Display -D ··············· Anti-glare LCD
Type -AB
-AD
-AG
-AQ
-AR
-CB
-CD
-CH
-EG
-EQ
-ER
-DD
···············
···············
···············
···············
···············
···············
···············
···············
···············
···············
···············
···············
General purpose for CE, RCM
General purpose for CSA
General purpose for KC
General purpose for EAC with PA
General purpose for EAC
IS for ATEX, IEC Ex
IS for FM, CSA
IS for NEPSI
IS for KOSHA
IS for EACEx with PA
IS for EACEx
NI for FM, CSA
1st input -P1
-C1
-C5
-D1
···············
···············
···············
···············
pH/ORP
Conductivity (SC)
Inductive conductivity (ISC)
Dissolved oxygen (DO)
2nd input -NN
-P1
-C1
-D1
···············
···············
···············
···············
Without input
pH/ORP
Conductivity (SC)
Dissolved oxygen (DO)
Output -A ··············· 4-20 mA + HART
—-N ··············· Always -N
Language set -LA ··············· English and 11 languages
Country -N
-J
···············
···············
Global except Japan
Japan
—-NN ··············· Always -NN
Option Mounting hardware
Hood
Tag plate
Conduit adapter
/UM
/U
/PM
/H6
/H7
/H8
/SCT
/CB4
/CD4
/CF4
Universal mounting kit
Pipe and wall mounting hardware
Panel mounting hardware
Hood, stainless steel
Hood, stainless steel + urethane coating
Hood, stainless steel + epoxy coating
Stainless steel tag plate
Conduit adapter (G1/2 x 4 pcs)
Conduit adapter (1/2NPT x 4 pcs)
Conduit adapter (M20 x 1.5 x 4 pcs)
2. Wiring and Installation
Open the front panel and remove the plastic wiring covers, and then install the cable glands (refer
to the Appendix A1).Re-install the wiring cover after the wiring is completed. Refer to the user’s
manual IM 12A01A03-01EN for details.
2.1 Installation site
The FLXA202/FLXA21 is weatherproof and can be installed both inside and outside. It should,
however, be installed as close as possible to the sensor to avoid long cable runs between the
instrument and sensor. When a pH sensor is used, the cable length including the sensor cable
should not exceed 20 meters (65.6 feet); 60 meters (197 feet) when using BA10 extension box
and WF10 cable. For a conductivity sensor the cable run should not exceed 60 meters (197 feet).
For dissolved oxygen the sensor cable run should not exceed 30 meters (100 feet).
Select an installation site that meets the following conditions.
• Mechanical vibrations and shocks are negligible
• No relay switch and power switch are installed close to the converter
• There is space for cable connection beneath the cable glands

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IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
• Not exposed to direct sunlight or severe weather conditions
• Maintenance is possible
• No corrosive atmosphere
• Ambient Operating Temperature: -20 to +55 °C
• Humidity:10to90%RHat40°C(Non-condensing)
• Water Protection: IP66 (except Canada), NEMA 4X (except Canada), Type 3S/4X (Canada)
If the instrument is installed outside and exposed to direct sunlight, a sun shade hood should be
used.
The FLXA202/FLXA21 can be mounted on a wall, pipe or panel when the mounting kit is
ordered. For dimensional information please refer to the Appendix, Mounting methods.
CAUTION
• Makesurethepowersupplyisswitchedo󰀨beforestartingtheinstallation.
• PowerratingmustcomplywithFLXA202/FLXA21specication.Powervoltagemustmatch
with the one indicated on the name plate.
• When you open the front panel, make sure the screws are completely out of the screw
holes. Then open the front panel slowly in order not to damage the threaded parts on
the housing. If the threaded parts are damaged and the screws cannot be tightened, the
waterproof performance will deteriorate.
• Be careful not to lose the four front panel screws.
2.2 Wiring
2.2.1 Cables, Terminals, glands and conduit adapter
The supplied cable glands are for cables with an outside diameter of 6 to 12 mm (0.24 to 0.47
inches). Unused cable entry holes must be sealed with cable glands including the supplied close
up plugs. When you protect cables with conduit, select conduit adapters with an option code /
CB4, /CD4 or /CF4. For details refer to the User’s Manual IM 12A01A03-01EN.
CAUTION
• Be careful not to be injured by the sharp hole edges on the housing.
• When installing cable glands, hold cable glands and tighten cable gland nuts to a torque
of 6 N•m. If cable glands, not gland nuts, are tightened, O-rings may be come out from the
proper positions.
• Whenusingacableconduit,useaexibleconduittoavoidstressontheconduitadapter.
The stress on the conduit adapter may damage the housing .
2.2.2 Wiring the power supply
PowerratingmustcomplywithFLXA202specication.
FLXA202/FLXA21 is a 2-wire analyzer and can be powered by a DC power supply.
• Output is FOUNDATION Filedbus and PROFIBUS PA option
The Power Supply voltage is 9 to 32V DC.
• Output is mA with HART
The load resistance: impedance of electronic equipment: typically 250 Ohm
Number of input modules: 1-sensor measurement or 2-sensor measurement.
One (1) Sensor module (1 input):
16 to 40 V DC (for analog sensor of pH/ORP, SC and DO)
17 to 40 V DC (for ISC)
21 to 40 V DC (for SA11 SENCOM Smart Adapter connected)
Two (2) Sensor modules (2 inputs):
22.8 to 40 V DC (for analog sensor of pH/ORP, SC and DO)

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IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
250
600
1000
024.718
V - 11.5
0.022
R =
1295
1617 22.8 4040
Voltage (V)
2-sensor measurement
Load resistance (Ω)
Digital Communication
Range (HART)
250
304
600
516
1000
0
24.7 18
V - 11.5
0.022
R =
1295
17 40
22.86
40
Except SENCOM SA
Voltage (V)
Load resistance (Ω)
Digital Communication
Range (HART)
18.2 21
<for pH/ORP, SC or DO> <for ISC or SENCOM SA>
Figure 2.8 Supply Voltage and Load Resistance
Open the front panel and remove the wiring covers to make the terminal block accessible.
2.2.3 Cables, terminals and glands for FOUNDATION
Fieldbus or PROFIBUS PA
Wire and install the system by referring to chapter 2 in the FLXA21 User’s manual (IM
12A01A02-71E or IM 12A01A02-72E).The FOUNDATION Fieldbus or PROFIBUS PA power
supply is 9 to 32 V DC. The wiring is the same.
However, for the FOUNDATION Fieldbus or PROFIBUS PA cables, see Table 2.1.
Table 2.1 FOUNDATION Fieldbus or PROFIBUS PA Cables and transmissible Length
Parameters Conditions Type A Type B Type C Type D
MaxDCResistance,Ω/km per conductor 22 56 132 20
Max Attenuation, dB/km 1.25 f, (39 kHz) 3.0 5.0 8.0 8.0
Gauge —#18 AWG
(0.82 mm2)
#22 AWG
(0.32 mm2)
#26 AWG
(0.13 mm2)
#16 AWG
(1.25 mm2)
Max Length, meters —1,900 1,200 400 200
Note: 1900 m is trunk + sum of Spurs (Max length type A cable)
Yokogawa recommends the use of Type A.
Usage of Type B and D is restricted.
Yokogawa does not recommend the use of Type C.
Table 2.2 Recommended length of Spur Cables
Number of spur cables Length of a non-intrinsically safe spur cable
15-16 60 m
13-14 90 m
1-12 120 m
Note: • 1 device per spur.
• Keep as short as possible (min 1 m)
l DIP switches
Figure 2.4 shows the DIP switches for setting the address and write protection.
Normally, you do not have the change them from the default settings.
Write protection switch (Default: OFF)
Address switch
(Default: Hardware address is disabled)
ON
OFF
1: Write protect
2: Simulate (only for FOUNDATION Fieldbus)
1
ON
OFF
2
1 2
3 4 5 6 7 8
7
Address bit
6 5 4 3 2 1 0
Figure 2.4 DIP switches

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IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
2.2.4 Grounding
Thewayofconnectingthegroundingisdi󰀨erentfromFLXA202,FLXA21.
• FLXA202
The ground cable is connected to the outer terminal marked
• FLXA21
The ground cable is connected to the inner terminal marked
B: FLXA21
(Internal grounding)
A: FLXA202
(External grounding)
2.2.5 Connection of the power supply
The power supply is connected to the terminals marked with + and – which corresponds with the
polarity of the DC power supply. The shield of cable is connected to the terminal marked , then
replace ground wiring cover. For details, refer to the User’s Manual IM 12A01A03-01EN.
FLXA21FLXA202
CAUTION
The FLXA202/FLXA21 is used with a DC power supply. Do not use an alternating current or 100
volt mains power supply.
2.2.6 Wiring covers
lFLXA202
NOTE
Wiring covers are required intrinsic safety (Type is -C*).
In the case of type -S5,only wiring cover 1 is attached to the FLXA202.
In the case of other types, the cover is not attached to the FLXA202.
When two sensor modules are used, the upper-level module is for input 1 and the lower-level
moduleisforinput2.Foreaseofinstallation,rstwireinput2sensoronthelower-levelmodule,
and attach the wiring cover 1; then wire input 1 sensor on the upper-level module and replace the
module wiring cover 2. For details, refer to the User’s Manual IM 12A01A03-01EN.

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IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
lFLXA21
When two sensor modules are used, the upper-level module is for input 1 and the lower-level
moduleisforinput2.Foreaseofinstallation,rstwireinput2sensoronthelower-levelmodule
(A), and attach the wiring cover; then wire input 1 sensor on the upper-level module (B) and
replace the module wiring cover (C).
When all wiring is completed and all wiring covers have been installed, the front panel can be
closed and the power can be switched on. For details, refer to the User’s Manual IM 12A01A03-
01EN.
2.2.7 Wiring the sensor
The FLXA202/FLXA21 can be used with a wide range of commercially available sensor types,
both from Yokogawa and other manufacturers.
Terminal screw size is M4, and torque of screw up is 1.2N•m
Pin terminal, ring terminal and spade terminal can be used.
Pin terminal: pin diameter: max. 1.9mm
Ring and spade terminal: width: max. 7.8mm
For details on the sensors, refer to the respective instruction manuals of the sensors.
See User’s Manual IM 12A01A03-01EN for more information on wiring the sensor.
CAUTION
Conrmthatalllocking-tabs(includingforBLANKslots)ofFLXA21arein“Lock”positionbefore
you close the front panel. If the locking-tabs are in “Unlock” position, the front panel may be
interfered with locking-tabs.
Lock Unlock
CAUTION
• Do not tighten up four front panel screws one by one.
• Eachfrontpanelscrewshouldbetightenedupintwotimesofscrewing.And,rstlythe
screw at the upper left should be screwed a bit, the next is at the lower right, third is at the
upper right, and fourth is at the lower left. The second round is the same sequence again to
tighten up four screws.
• Do not use an electric screwdriver with high revolutions. If an electric screwdriver is used for
these front panel screws, the revolutions of the electric screwdriver should be less than 400 rpm.
• Four screws should be tightened to the following torque; 0.8 to 0.9 N•m
3. Operation
When all wiring is completed, turn on the power to the instrument. Make sure that the LCD
screen turns on, and then the Quick-setup appears. When you use SENCOM SA and connect
no SENCOM SA or incompatible sensors, an error appears to indicate inappropriate setting
ormeasurementerror.Ifcongurationsarenotproper,anerrormaybedisplayed,orthe
measurement values may be incorrect. Check the initial settings and change them to suit your
purpose. For details, refer to the following User’s Manual.

<Start-up manual> 15
IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
Contents Document number
FLXA202/FLXA21 2-Wire Analyzer Operation of pH/ORP IM 12A01A03-31EN
FLXA202/FLXA21 2-Wire Analyzer Operation of SC IM 12A01A03-32EN
FLXA202/FLXA21 2-Wire Analyzer Operation of ISC IM 12A01A03-33EN
FLXA202/FLXA21 2-Wire Analyzer Operation of DO IM 12A01A03-34EN
FLXA202 2-Wire Analyzer Operation of SENCOM SA-pH/ORP IM 12A01A03-36EN
FLXA202 2-Wire Analyzer Operation of SENCOM SA-SC IM 12A01A03-37EN
lChange language
ThedefaultlanguagesettingfortheFLXA202/FLXA21isEnglish.Toselectadi󰀨erentlanguage
other than English, refer to the User’s Manual IM 12A01A03-01EN.
lOperation
According to the sensor to be used, refer to appropriate user’s manual about operation.
4. Maintenance
nPeriodic maintenance
The FLXA202/FLXA21 requires very little periodic maintenance, except to make sure the front
window is kept clean in order to permit a clear view of the display and allow proper operation of
the touchscreen. If the window becomes soiled, clean it using a soft damp cloth or soft tissue.
To deal with more stubborn stains, a neutral detergent may be used.
When you must open the front cover and/or glands, make sure that the seals are clean and
correctlyttedwhentheunitisre-assembledinordertomaintainthehousing’sweatherproof
integrity against water and water vapor.
The pH measurement uses high impedance sensors and may otherwise be prone to problems
caused by exposure of the circuitry to condensation.
CAUTION
Never use harsh chemicals or solvents. In the event that the window does become heavily
stained or scratched, refer to the parts list for replacement part numbers.
lBattery
The FLXA202/FLXA21 has a logbook feature that uses a clock to provide the timings. The
instrument contains a lithium cell (battery) to continue the clock function while the power is turned
o󰀨.Althoughthecellhasanexpectedworkinglifeof10years,thisisnotguaranteed.Whenthis
cell needs replacing, contact your nearest Yokogawa service center.
n Periodic maintenance of the sensor
Please follow the manual of each sensor about the maintenance of the sensor.
lPredictive maintenance
The FLXA202/FLXA21 has a unique prediction function (wellness check).
By making settings concerning the sensor wellness check, you can grap the condition of the
sensor in the gauge display in the Detail screen and carry out predictive maintenance.

<Start-up manual> 16
IM 12A01A02-12E 10th Edition : Jan. 12, 2021-00
Revision Record
Jan. 2021/10th Edition
Revised overall
Mar. 2018/9th Edition
Change the location of the nameplate, addition of Type n, deletion of stainless steel housing, etc.
Oct. 2015/8th Edition
Addition of FLXA202
Apr. 2015/7th Edition
Change of “type of ground” of the stainless steel housing (pages 14 and 15), Note for wall mounting
(pages 14 and 15)
Oct. 2014/6th Edition
Correction of discriptions and words
Oct. 2013/5th Edition
Addition of MONITOR display, Correction of discriptions and words
Sep. 2013/4th Edition
 Pagesaresignicantlyreduced
Feb. 2012/3rd Edition
Addition of descriptions and drawings for intrinsically safe type, Change of descriptions of messages
ondisplays,Changeofguresofhousingduetochangeofpositionofexternalgroundingforstainless
steelhousing,Changeofguresofwiringcovers,Changeofdescriptionofmessagelanguagedueto
addition of message languages, And, other corrections
Aug. 2010/2nd Edition
Followings are mainly revised;
  Additionofgroundingterminalpositiononstainlesshousingwithspecicmountings,Addition
ofplatepositiononstainlesshousingwithspeciccoatings,Additionofexplanationofsleeve
for grounding wire for plastic housing, Correction of torques, Addition of Note, Warning
etc., Addition of detail descriptions for wire terminals, Addition of drawings of housing with
hood, Addition of example displays for calculated data and redundant system, Addition of
explanation of passwords, Correction of errors on the User setting tables
May 2010/1st Edition
Newly published
Yokogawa Electric Corporation
2-9-32 Nakacho, Musashino-shi, Tokyo 180-8750, JAPAN
http://www.yokogawa.com/