YOKOGAWA FLXA402T User manual

User’s
Manual FLXA402T Liquid Analyzer
for Turbidity and Chlorine
Installation and Wiring
(Introduction and General Description)
IM 12A01G01-02EN
IM 12A01G01-02EN
1st Edition

i
IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
uIntroduction
Thank you for purchasing the FLXATM402T Liquid Analyzer for Turbidity and Chlorine.
This User’s Manual contains all essential information for the user to make full use of FLXA402T.
Please read the following respective documents before installing and using the FLXA402T.
The related documents are listed as follows.
General Specications
Contents Document number Note
FC800D Non-reagent type
Free Available Chlorine Analyzer GS 12F05B10-01EN Online manual
RC800D Reagent Type
Residual Chlorine Analyzer GS 12F04B10-01EN Online manual
TB820D Right Angle Scattered Light
Turbidity Analyzer GS 12E01B30-01EN Online manual
“EN” in the document number is the language code.
User’s Manual
Contents Document number Note
FLXA402T Liquid Analyzer for Turbidity
and Chlorine
Start-up and Safety Precautions
IM 12A01G01-01EN Attached to the product (printed manual)
FLXA402T Liquid Analyzer for Turbidity
and Chlorine
Installation and Wiring
IM 12A01G01-02EN Online manual (This manual)
FLXA402T Liquid Analyzer for Turbidity
and Chlorine
Operation of Converter
IM 12A01G01-03EN Online manual
FLXA402T Liquid Analyzer for Turbidity
and Chlorine
Operation of pH
IM 12A01G02-01EN Online manual
FLXA402T Liquid Analyzer for Turbidity
and Chlorine
Operation of SC
IM 12A01G03-01EN Online 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.
Technical Information
Contents Document number Note
FLXA402T Liquid Analyzer for Turbidity
and Chlorine
MODBUS communication
TI 12A01G01-62EN Online manual
“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/xa402t/download/
Please read the individual user’s manuals for sensors/detectors and other related products.
Media No. IM 12A01G01-02EN 1st Edition : Mar. 2021 (YK)
All Rights Reserved Copyright © 2021, Yokogawa Electric Corporation

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IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
nNotes 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.
nDrawing 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.
nComposition of this User’s Manual
FLXA402T Liquid Analyzer for Turbidityand and Chlorine provides converter function to realize
the following measurement according to user’s specication.
FC (Free chlorine analyzer), RC (Residual chlorine analyzer),
TB (Right Angle Scattered Light Turbidity Analyzer), pH, Resistivity/Conductivity (SC).
This manual describes the outline, installation, and wiring of the product that you should read rst
among the common parts of the converter. For operations (equipment settings, calibration) that
di󰀨er depending on the specications, refer to the other user’s manuals, that are separated as
shown in the table below.
Contents FC800D RC800D TB820D pH Conductivity
(SC)
Introduction and
general description IM 12A01G01-02EN (This manual)
Wiring and installation
Converter
operation (Setting,
Maintenance,
Troubleshooting)
IM 12A01G01-03EN
Sensor operation
(Setting, Calibration)
IM 12F05B10-
02EN
IM 12F04B10-
02EN
IM 12E01B30-
02EN
IM 12A01G02-
01EN
IM 12A01G03-
01EN
nTrademark Notices
• FLEXA, FLXA, 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.

Toc-1
IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
FLXA402T
Liquid Analyzer for Turbidity and Chlorine
Installation and Wiring (Introduction and General Description)
CONTENTS
IM 12A01G01-02EN 1st Edition
uIntroduction....................................................................................................i
1. INTRODUCTION AND GENERAL DESCRIPTION.................................. 1-1
1.1 Instrument check .............................................................................................. 1-2
1.2 Name and description ...................................................................................... 1-6
1.3 Specication...................................................................................................... 1-8
1.4 Model & Su󰀩x Codes ....................................................................................... 1-9
1.5 Dimensions...................................................................................................... 1-10
2. WIRING AND INSTALLATION .................................................................. 2-1
2.1 Installation site .................................................................................................. 2-1
2.2 Mounting methods............................................................................................ 2-2
2.3 Removing the shield cover .............................................................................. 2-3
2.4 Installing the cable glands ............................................................................... 2-4
2.5 Wiring ................................................................................................................. 2-6
2.5.1 Wiring the power supply terminal unit................................................ 2-7
2.5.2 Wiring relay module (Contact outputs) .............................................. 2-9
2.5.3 Wiring network cables...................................................................... 2-10
2.5.4 Wiring IO module ............................................................................. 2-11
2.6 Sensor wiring .................................................................................................. 2-13
2.6.1 Wiring Chlorine meter, Turbidity meter ............................................ 2-14
2.6.2 Wiring the pH sensor ....................................................................... 2-15
2.6.3 Wiring the conductivity (SC) sensor................................................. 2-16
Customer Maintenance Parts List.......................................CMPL 12A01G01-01EN
Revision Record.......................................................................................................i

Blank Page

<1. INTRODUCTION AND GENERAL DESCRIPTION> 1-1
IM 12A01G02-02EN 1st Edition : Mar. 25, 2021-00
1. INTRODUCTION AND GENERAL
DESCRIPTION
The FLXA402T works with pH, conductivity sensors in addition to turbidity or residual chlorine
sensors.
For the transfer of diagnostic data and other device information to a host system, the FLXA402T
supports MODBUS RTU/RS485 protocols. The FLXA402T also provides local display using RS-
485 or Ethernet. For further information, see the general specications of as below.
Document title Document number
FC800D Non-reagent Type
Free Available Chlorine Analyzer
GS 12F05B10-01EN
RC800D Reagent Type
Residual Chlorine Analyzer
GS 12F04B10-01EN
TB820D Right Angle Scattered Light
Turbidity Analyzer
GS 12E01B30-01EN
This manual describes how to use the FLXA402T with Yokogawa’s sensors. Please read
carefully this manual and other manuals relevant to those sensors you use before using this
instrument.

<1. INTRODUCTION AND GENERAL DESCRIPTION> 1-2
IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
1.1 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
Make sure the model and su󰀩x code on the nameplate a󰀩xed to the left side of the housing.
Refer to 1.4 Model & Su󰀩x Codes
Apply correct power identied on the nameplate to the unit.
-A-B-AB-CL-NN-N2-NR
-N-N-N-NN-NN/U/H6
Figure 1.1 Example of nameplate (FLXA402T)
You nd the model, style, and serial number of the product inside of the front panel, but no
description of the power supply.

<1. INTRODUCTION AND GENERAL DESCRIPTION> 1-3
IM 12A01G02-02EN 1st Edition : Mar. 25, 2021-00
nSpare parts
Spare parts are supplied by Yokogawa with the product. Make sure items in Table 1.1 are
included.
Table 1.1 Spare parts
Product Name Model and su󰀩x code Quantity Remark
Cable glands All others except the one
below
Cable gland (M20x1.5): 8 pcs
Rubber plug attachment : 5 pcs
Digital communication: -E
(Modbus TCP/IP)
Cable gland (M20x1.5): 7 pcs
Ethernet cable gland (black):
1 piece
Rubber plug attachment
(black): 5 pcs
Grommet set 2nd input: -P1(pH) 1set
Grommet 1st input: -CL or -TB
(SENCOM SA)
1 piece
2nd input: -CL or -TB
(SENCOM SA)
1 piece
Jumper 2nd input: -P1(pH) 2 pcs
Digital communication:
-R (Modbus RTU(RS-485))
1 piece For terminating
resistor
Start-up Manual
IM 12A01G01-01EN
All 1 book

<1. INTRODUCTION AND GENERAL DESCRIPTION> 1-4
IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
Table 1.2 Options (option code)
Product Name Model and
su󰀩x code
Quantity Remark
Pipe and wall mounting
hardware
Option code: /
UM, /U
1 set For /UM, bracket for /U
and /PM,one of each,
are supplied.
Panel mounting
hardware
Option code:
/UM, /PM
1 set
Hood Option code:
/H6, /H7
1 set
Stainless steel tag plate Option code:
/SCT
1 set Stainless steel tag plate
wire
User-specied tag
number is printed.
Tag plate
TAG NO.
when other
than /SCT is
specied with a
print order of tag
plate number.
1 piece User-specied tag
number is printed.

<1. INTRODUCTION AND GENERAL DESCRIPTION> 1-5
IM 12A01G02-02EN 1st Edition : Mar. 25, 2021-00
Product Name Model and
su󰀩x code
Quantity Remark
Conduit adapter Option code:
/CB4, /CD4, /
CF4
Adapter: 4 pcs
Cable gland for adapter: 4 pcs
Rubber plug attachment : 1 piece
/CB6, /CD6, /
CF6
Adapter: 3 pcs
Cable gland for adapter: 3 pcs
Ethernet adapter: 1 piece
Ethernet cable gland (black): 1 piece
Rubber plug attachment 1 piece
Parts to be purchased separately are not listed here. For information on accessories to be
purchased separately, see 1-10 lConduit adapter (need to be purchased additionally)

<1. INTRODUCTION AND GENERAL DESCRIPTION> 1-6
IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
1.2 Name and description
1
ON
2
Cable entry holes
Jumper holder
(provided only for
pH measurement)
Front view Front view with the front panel opened
Reboot switch
(Do not use it)
SD card slot
(SD card is not supplied
with the product.)
Terminal block
for power supply
LCD display
Slide switch
(Do not use it)
Front panel
Module (varied by specifications)
Figure 1.2 FLXA402T Parts names and descriptions
CAUTION
Do not switch ON the Slide switch 1 or 2. Do not press reboot switch, either.

<1. INTRODUCTION AND GENERAL DESCRIPTION> 1-7
IM 12A01G02-02EN 1st Edition : Mar. 25, 2021-00
FLXA402T is a module-designed converter, assigning each function to respective module. The
gure below shows how modules are installed, although modules to use are di󰀨erent according
to specication.
IO module
Power terminal
Ground terminal
Fuse case
1st sensor module *1
*2
*3
*1
2nd sensor module
Communication module
Relay module
*1: 1st/2nd input in Model and Su󰀩x code denes what is printed on the side of the sensor
module. Figure 1.3 shows an example of selecting -CL/-TB and -P1. The following list
shows what is printed according to the code.
-CL SENCOM SA for Chlorine
-TB: SENCOM SA for Turbidity
-P1: PH
-C1: SC
-NN: (selectable for only 2nd input. No 2nd sensor module. )
*2: An example when -R (Modbus RTU(RS-485)) is specied.
The next gure shows an example when -E (Ethernet) is specied.
Modbus TCP/IP
(Ethernet)
*3: An example when -WR (Contact outputs) for Contact Outputs is specied.
Figure 1.3 FLXA402T Module installation (example, without shield cover)

<1. INTRODUCTION AND GENERAL DESCRIPTION> 1-8
IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
lJumper and Jumper holder
When you don’t need the jumpers, store them in the jumper holders located inside of the front
panel, to prevent them from being lost.
You can put jumpers anywhere among 5 holders (1A and 4Bs) as Figure 1.4.
A has a guide hole. B has clicks on both side of each holder.
A Bclicks
Figure 1.4 Jumper holders
1.3 Specication
See the latest general specications.
Document title Document number
FC800D Non-reagent Type
Free Available Chlorine Sensor Unit GS 12F05B10-01EN
RC800D Reagent Type
Residual Chlorine Sensor Unit GS 12F04B10-01EN
TB820D Right Angle Scattered Light
Turbidity Detector GS 12E01B30-01EN

<1. INTRODUCTION AND GENERAL DESCRIPTION> 1-9
IM 12A01G02-02EN 1st Edition : Mar. 25, 2021-00
1.4 Model & Su󰀩x Codes
Model Su󰀩x code Option code Description
FLXA402T ······································································· ················· Liquid Analyzer for Turbidity and Chlorine
Power
supply
-A ················· AC version
Housing -B
-D
·················
·················
Aluminum alloy cast + urethane coating
Aluminum alloy cast + high anti-corrosion
coating
Type -AB
-AD
-AG
-AJ
·················
·················
·················
·················
General purpose for CE, RCM, China standard
General purpose for CSA
General purpose for KC
General purpose
1st input -CL
-TB
·················
·················
SENCOM SA for Chlorine
SENCOM SA for Turbidity
2nd input -NN
-P1
-C1
-CL
-TB
·················
·················
·················
·················
·················
Without input
pH (PH)
Conductivity (SC)
SENCOM SA for Chlorine
SENCOM SA for Turbidity
mA Output/Input -N2
-N4
·················
·················
2 x 4-20 mA Output + 1 x Contact Input
(without HART)
4 x 4-20 mA Output + 2 x Contact Input + 1 x
4-20 mA Input (without HART)
Contact Outputs -WR
-NR
·················
·················
Contact outputs (Wash, range, Fail contact
outputs)
Without Contact outputs (without Wash and Fail
contact outputs)
Bluetooth -N ················· Always -N
Digital Communication -N
-E
-R
················
·················
·················
Without Digital communication
Modbus TCP/IP
Modbus RTU (RS-485)
Country -N ················ Global except Japan
Stanchion -NN ················ Not assembled in stanchion
—-NN ················· Always -NN
Option Mounting hardware
Hood
Tag plate
Conduit adapter
/UM
/U
/PM
/H6
/H7
/SCT
/CB4
/CD4
/CF4
/CB6
/CD6
/CF6
Universal mounting kit
Pipe and wall mounting hardware
Panel mounting hardware
Hood, stainless steel
Hood, stainless steel + urethane 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
Conduit adapter G1/2 x 3 pcs + G 1/2 for
Ethernet x 1 pcs
Conduit adapter 1/2NPT x 3 pcs + 1/2 NPT for
Ethernet x 1 pcs
Conduit adapter M20 x 1.5 x 3 pcs + M20 for
Ethernet x 1 pcs
.

<1. INTRODUCTION AND GENERAL DESCRIPTION> 1-10
IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
lConduit adapter (need to be purchased additionally)
Type Parts
number Quantity Remark
G 1/2
(Cable gland for adapter + adapter)
K9703WF 4 set for Option code /CB□
1/2 NPT
(Cable gland for adapter + adapter)
K9703WG 4set for Option code /CD□
M 20 x 1.5
(Cable gland for adapter + adapter)
K9703WH 4 set for Option code /CF□
lOptional parts
Name Parts
number Quantity Remark
Mounting
hardware
for pipe, wall mounting
(stainless)
K9703SS 1 set same as Option code /U
for panel mounting
(stainless)
K9703ZD 1 set same as Option code /PM
Sun shade hood Stainless K9698WK 1 set same as Option code /H6
stainless + urethane K9698WL 1 set same as Option code /H7
Rubber plug attachment K9334CN 1 pcs for Cable gland
Fuse A1633EF 1 pcs 250V/2.5A (minimum 5 pcs)
SD card A1005NL 1 pcs 2 GB industrial SD card (with power failure
recovery)
Customers can provide the cards with spec.:
Storage capacity:
128 MB or greater
Type: SD, SDHC
NOTE
SD cards are supplied by users if necessary. For further information, see 5.1 in IM 12A01G01-
03EN.
1.5 Dimensions
See the latest general specications.
Document title Document number
FC800D Non-reagent Type
Free Available Chlorine Sensor Unit
GS 12F05B10-01EN
RC800D Reagent Type
Residual Chlorine Sensor Unit
GS 12F04B10-01EN
TB820D Right Angle Scattered Light
Turbidity Detector
GS 12E01B30-01EN

<2. WIRING AND INSTALLATION> 2-1
IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
2. WIRING AND INSTALLATION
Install the cable glands on FLXA402T before wiring. The cable glands are included inside the
product package.
2.1 Installation site
The FLXA402T is weatherproof and can be installed both indoors and outdoors. It should,
however, be installed as close as possible to the sensor to avoid long cable runs between the
instrument and sensor.
Select an installation site where the ambient temperature and humidity are within the limits of the
instrument specications as below. If the instrument is installed outdoors and exposed to direct
sunlight, a sun shade hood should be used.
Ambient Operating Temperature: -20 to +55 ºC
Storage Temperature: -30 to +70 ºC
Humidity: 10 to 90% RH at 40ºC (Non-condensing)
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.
• Not exposed to direct sunlight or severe weather conditions.
• Maintenance is possible.
• No corrosive atmosphere.

<2. WIRING AND INSTALLATION>2-2
IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
2.2 Mounting methods
See 1.5Dimensions for information on the hardware for mounting.
The FLXA402T has various mounting possibilities.(Figure.2.1)
• Panel mounting using optional mounting hardware (/PM or /UM)
• Wall mounting using optional mounting hardware (/U or /UM)
• Pipe mounting using optional mounting hardware (/U or /UM) on a horizontal or vertical
pipes (Nominal diameter size: 50A)
The universal mounting kit (/UM) contains the pipe and wall mounting hardware (/U) and the
panel mounting hardware (/PM). Some can be left unused.
195
0
+1
138
0
+1
138
185
Unit: mm
Panel mounting
Wall mounting
Pipe mounting
Note: The attached hardware is the same
as that for the pipe mounting.
Only the bracket is used for the
wall mounting.
Note: The wall on which the
analyzer is mounted
should be strong enough
to bear the weight of
more than 8kg.
Note: Horizontal pipe mounting is
possible by turning the bracket
90 degrees.
M8 bolt (not supplied)
Prepare bolts of the same
length as the mounting hole.
Note: For a sun shade hood (option),
use the upper two bracket
mounting screws to fix it.
Bracket
Wall mounting holes (x3)
Wall
Bracket mounting screws*
Bracket mounting screws*
Fixing screws (x2)
Panel
Spacing panel cutout
Nuts (x2)
Washers (x2)
Stanchion (50A pipe)
Bracket mounting screws*
Bracket
Bracket
Bracket for piping
U-bolt
* Tighten the four screws to a torque of 2 N·m.
* Tighten the four screws to a torque of 2 N·m.
* Tighten the four screws to a torque of 2 N·m.
Figure 2.1 Three types of mounting with the optional mounting hardware
When you change the mounting type, you can order mounting hardware optionally. For further
information see lOptional parts

<2. WIRING AND INSTALLATION> 2-3
IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
2.3 Removing the shield cover
The shield cover covers high-voltage power supply terminals and relay modules.
CAUTION
To ensure your safety, be sure to shut down the power supply before you remove the shield
cover.
Open the front panel and remove the shield cover. After removing the shield cover, install the
cable glands.
To remove the shield cover, loosen the 2 screws at Δ (triangle). Pull out the shield cover by
holding the marked point :○ (circle) (Figure 2.2).
NOTE
Be careful not to lose the shield cover screws.
Shield cover
Don’t loosen
these screws.。
Screw
Figure 2.2 Shield cover

<2. WIRING AND INSTALLATION>2-4
IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
2.4 Installing the cable glands
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
rubber close up plugs.
When the su󰀩x code for Digital Communication code is -E (Modbus TCP/IP), apply cable glands
(black) for Ethernet to the holes on the modules for communication.
For installing conduit adapters, apply Conduit adapter set lConduit adapter (need to be
purchased additionally) and follow the instruction shown on Figure 2.5.
For IO module
For sensor modules
For relay module
For power supply
For COM module
Figure 2.3 Cable gland conguration
CAUTION
Be careful not to be injured by the sharp hole edges on the housing.
Cable gland
O-ring
Cable gland
cap
Case
Close up plug
(rubber)
Seal packing
Figure 2.4 Cable glands
CAUTION
To install cable glands, tighten it with torque of 2 N•m.

<2. WIRING AND INSTALLATION> 2-5
IM 12A01G01-02EN 1st Edition : Mar. 25, 2021-00
lConduit adapter
When protecting the cable with a conduit, use an adapter. (option codes: /CB4, /CD4, /CF4,
/CB6, /CD6 /, /CF6)
CAUTION
There are 8 holes for cable connection. Apply the cable gland of supplied accessories (dark-
grayed cable glands) to the holes which no conduit adapters connect to.
Apply the supplied cable gland for adapter (white) to the holes which conduit adapters connect to
instead of using supplied-accessory cable gland (dark gray). (Figure 2.5)
Caps of cable glands are not used.
For Ethernet wiring, use Cable gland for Ethernet (black) and Conduit adapter for Ethernet
(punched with a letter “E”).
G1/2 (/CB4, /CB6)
1/2NPT (/CD4, /CD6)
M20x1.5 (/CF4, /CF6)
Adapter
Cable gland
for adapter
Case Case
G1/2 (/CB6)
1/2NPT (/CD6)
M20x1.5 (/CF6)
Adapter
for Ethernet
Cable gland
for Ethernet
Figure 2.5 Conduit adapter (option)
CAUTION
When using a cable conduit, use a exible conduit to avoid stress on the conduit adapter.
The excessive stress on the conduit adapter may damage the housing.