YOKOGAWA TB820D User manual

User’s
Manual TB820D
Right Angle Scattered Light
Turbidity Detector
IM 12E01B30-02EN
IM 12E01B30-02EN
2nd Edition

i
IM 12E01B30-02EN
<INTRODUCTION>
2nd Edition : June 09 , 2021-00
uINTRODUCTION
Thank you for purchasing TB820D Right Angle Scattered Light Turbidity Detector, FLXA402T
Liquid Analyzer for Turbidity and Chlorine.
This User’s Manual contains all essential information for the user to make full use of TB820D and
FLXA402T.
Please read the following respective documents before installing and using the instrument.
The related documents are listed as follows.
General Specications
Contents Document number Note
TB820D, FLXA402T 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
TB820D Right Angle Scattered Light
Turbidity Detector
Start-up and Safety Precautions
IM 12E01B30-01EN Attached to the product (printed manual)
TB820D Right Angle Scattered Light
Turbidity Detector IM 12E01B30-02EN Online manual (this manual)
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
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/
Refer to each corresponding manual for other related products.
No.IM 12E01B30-02EN 2nd Edition: June 2021 (YK)
All Rights Reserved Copyright © 2021, Yokogawa Electric Corporation

ii
IM 12E01B30-02EN
<INTRODUCTION>
2nd Edition : June 09 , 2021-00
n Notes 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.
nTerminology
● Turbidity meter, Turbidity analyzer: TB820D + FLXA402T
● Detector, Detection unit: TB820D detector, TB820D Detection unit
● Converter or liquid analyzer: FLXA402T
n Trademark Acknowledgements
• 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.

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IM 12E01B30-02EN
<CONTENTS>
2nd Edition : June 09 , 2021-00
TB820D
Right Angle Scattered Light Turbidity Detector
CONTENTS
IM 12E01B30-02EN 2nd Edition
◆INTRODUCTION.............................................................................................i
1. OVERVIEW ................................................................................................ 1-1
1.1 Measurement system and structure............................................................... 1-1
1.2 Part Name and Functions ................................................................................ 1-2
1.3 Specications.................................................................................................... 1-2
1.4 Model and Codes .............................................................................................. 1-3
1.5 External Dimensions ........................................................................................ 1-4
1.6 Measurement principle..................................................................................... 1-4
2. INSTALLATION, PIPING, AND WIRING ..................................................... 2-1
2.1 Wiring ................................................................................................................. 2-2
2.1.1 SENCOM cable for turbidity and chlorine (A) .................................... 2-6
2.1.2 Power cable for FLXA402T (B).......................................................... 2-6
2.1.3 Power supply cable (C)...................................................................... 2-6
2.1.4 Wiring with PG400 ............................................................................. 2-7
2.1.5 When Relay box for solenoid valve is included ................................. 2-7
2.2 Piping ................................................................................................................. 2-9
2.2.1 System Using an Open Head Tank (/D3) .......................................... 2-9
2.2.2 A system using a Simple head tank (/D2) ....................................... 2-12
2.2.3 System Using a Pressurized Head Tank (/D1) ................................ 2-14
2.2.4 System without a Head Tank ........................................................... 2-17
3. PREPARATION for OPERATION ............................................................. 3-1
3.1 Piping and Wiring Check.................................................................................. 3-1
3.2 Conrming detector condition..................................................................................... 3-1
3.3 Supplying Power and switching operation mode...................................................... 3-1
3.4 Filling zero water and Test operation.............................................................. 3-2
3.5 Setting Operation Parameters......................................................................... 3-2
3.6 Calibration ......................................................................................................... 3-2
3.7 Supplying a Sample and Adjusting the Flow Rate........................................ 3-3
3.8 Adjusting ultrasonic power ............................................................................. 3-4
3.9 Switching to measurement mode ................................................................... 3-4
4. SETTING PARAMETERS ......................................................................... 4-1
4.1 Measure setting................................................................................................. 4-3
4.1.1 Negative value non output ................................................................. 4-3
4.1.2 Turbidity unit select ............................................................................ 4-3

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<CONTENTS>
2nd Edition : June 09 , 2021-00
4.1.3 Meas. damping time constant, Maint. damping time constant .......... 4-3
4.1.4 Turbidity warning High/Low limit ........................................................ 4-3
4.1.5 Air denoising setting........................................................................... 4-3
4.2 Cal./Maint. Settings........................................................................................... 4-6
4.2.1 Turbidity value of check tool............................................................... 4-6
4.2.2 Zero shift value, Correction factor...................................................... 4-6
4.2.3 Stability check .................................................................................... 4-6
4.2.4 Wash/Cal. box.................................................................................... 4-6
4.2.5 Ultrasonic wash.................................................................................. 4-6
4.2.6 Calibration setting others ................................................................... 4-7
4.3 Diagnosis setting .............................................................................................. 4-7
4.3.1 Light source diagnosis ....................................................................... 4-7
4.3.2 Dried condition diagnosis................................................................... 4-7
4.3.3 Operating days................................................................................... 4-7
4.4 Communication setting.................................................................................... 4-7
4.5 Auto Wash/Calibration setting ........................................................................ 4-8
4.5.1 Auto sequence for wash/cal............................................................... 4-8
4.5.2 Start date............................................................................................ 4-8
4.5.3 Auto Wash/Calibration function and wash type ................................. 4-8
4.5.4 Auto sequence setting ....................................................................... 4-8
5. FLXA402T sensor menu .......................................................................... 5-1
5.1 WASH ................................................................................................................. 5-2
5.2 Calibration ......................................................................................................... 5-2
5.3 Detail................................................................................................................... 5-2
5.4 Reset op. time.................................................................................................... 5-5
5.5 Setting ................................................................................................................ 5-5
5.6 Maintenance ...................................................................................................... 5-6
6. OPERATION .............................................................................................. 6-1
6.1 Turbidity measurement .................................................................................... 6-1
6.2 Air denoising ..................................................................................................... 6-1
6.3 When Sample Water Supply is Cut O󰀨 ........................................................... 6-1
6.4 Automatic wash/Automatic calibration Operation........................................ 6-1
6.5 Stop and restarting operation ......................................................................... 6-1
7. CALIBRATION........................................................................................... 7-1
7.1 Turbidity calculation and calibration menu ................................................... 7-2
7.2 Turbidity standards........................................................................................... 7-3
7.3 Zero Calibration................................................................................................. 7-7
7.4 Slope calibration (Check tool) ......................................................................... 7-8
7.5 Slope calibration (Standard solution)............................................................. 7-8
7.6 Auto zero calibration ........................................................................................ 7-9
7.7 Zero shift correction ......................................................................................... 7-9
7.8 Sensitivity correction ....................................................................................... 7-9
7.9 2 points correction.......................................................................................... 7-10

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<CONTENTS>
2nd Edition : June 09 , 2021-00
7.10 Basic (reference) sensitivity calibration....................................................... 7-11
7.11 Calibration Error.............................................................................................. 7-11
8. MAINTENANCE......................................................................................... 8-1
8.1 Washing the Flow cell....................................................................................... 8-2
8.2 Washing the Head Tank.................................................................................... 8-3
8.3 Checking and Replacing Desiccants.............................................................. 8-4
8.4 Pipe Cleaning .................................................................................................... 8-4
8.5 Replacing the Zero Turbidity Filter Element .................................................. 8-5
8.6 LED Replacement ............................................................................................. 8-6
8.7 Fuse Replacement ............................................................................................ 8-8
8.8 Window glass replacement............................................................................ 8-10
8.9 Flow cell replacement..................................................................................... 8-14
9. TROUBLESHOOTING .............................................................................. 9-1
9.1 When an error occurs....................................................................................... 9-1
9.2 When No Error Indication Appears ................................................................. 9-3
Appendix .................................................................................................. App.-i
Customer Maintenance Parts List............................... CMPL 12E01B30-01EN
Revision Information...........................................................................................i

Blank Page

<1. OVERVIEW> 1-1
IM 12E01B30-02EN 2nd Edition : June 09 , 2021-00
1. OVERVIEW
To keep good quality in industrial or drinking water and rivers or streams, “Turbidity” is one of the
important measurement parameters to control water quality.
Turbidity analyzer is more than ever demanded not only for water treatment, but currently for
measurement/detection of suspended substances in industrial waste or of turbidity at chemical
processing facility.
Since their sales began in 1959, Yokogawa turbidimeters have been continuously developed and
improved using various measurement principles suited for various applications. With its many
achievements, Yokogawa has earned its customers’ condence. Right Angle Scattered Light
Turbidity Analyzer, composed of Turbidity Detector TB820D and Liquid Analyzer FLXA402T, is
a next-generation analyzer, developed based on years of experience, combining the reliable
measurement principle with our latest digital sensor technology realizing high e󰀩ciency in facility
operations.
FLXA402T is a converter designed, being tailored from the well-received FLXA402, to provide
multiple detector measurements. In addition to conventional analog output, Modbus TCP,
Modbus RTU/RS485 are available.
The technology of predictive maintenance prevents accidental shutdown of the factory and
reduces OPEX. TB820D has drastically improved maintainability and minimized maintenance
time.
1.1 Measurement system and structure
TB820D is used with FLXA402T Liquid Analyzer for Turbidity and Chlorine. TB820D also can be
used with a sampling system to control the pressure or ow rate of samples.
lTB820D Right Angle Scattered Light Turbidity Detector
TB820D measures turbidity. The Detection unit consists of the following three parts.
● Flow cell: Sample ows through it.
● Detection unit: Optical system incorporating Light source and Receiver
● Smart unit: Memory of parameters, the control unit
l FLXA402T Liquid Analyzer for Turbidity and Chlorine (converter)
The FLXA402T Liquid Analyzer for Turbidity and Chlorine output/displays measurement or status
of connected detectors.
Refer to IM 12A01G01-03EN for the setup of the display, input/output, or communication.
l Sampling System
Sample introduced into TB820D needs to be free from air bubbles by using a Head tank to
stabilize the pressure in piping and the ow rate. Use the sampling system if necessary.

<1. OVERVIEW>
1-2
IM 12E01B30-02EN 2nd Edition : June 09 , 2021-00
1.2 Part Name and Functions
nTB820D Turbidity detector
Top cover
Detection unit Flow cell
Smart unit
Smart unit cover
Front cover
Sample water outlet
LED
Sample water inletDrain
Fuse
1.3 Specications
See TB820D General Specication GS 12E01B30-01EN.

<1. OVERVIEW> 1-3
IM 12E01B30-02EN 2nd Edition : June 09 , 2021-00
1.4 Model and Codes
n Model and Su󰀩x Codes
TB820D Right Angle Scattered Light Turbidity Detector
Model Su󰀩x code
Option
code
Description
TB820D ············································· ········· Right Angle Scattered Light Turbidity Detector
Light
source
-NT
-FN
········· 660nm, Formazin, 0-0.2 NTU to 0-500 NTU
860nm, Formazin, 0-0.2 FNU to 0-700 FNU
Type -AB
-AD
-AG
-AJ
·········
·········
·········
·········
General purpose for CE, RCM, China standard
General purpose for CSA
General purpose for KC
General purpose
Relay box for
solenoid valve
-NN
-A5
·········
·········
Without relay box for solenoid valve
Relay box for solenoid valve
Ultrasonic cleaning -NN
-U1
·········
·········
Without ultrasonic cleaning
Oscillator for ultrasonic cleaning
Check tool -CT ········· With Check tool
―-NN ········· Always -NN
Option /L02
/L03
/L05
/L10
/L20
/SCT
/U
/CB3
/CD3
/CF3
/D1
/D2
/D3
/TC
/TCN
/NPT
Connection cable for analyzer 2 m
Connection cable for analyzer 3 m
Connection cable for analyzer 5 m
Connection cable for analyzer 10 m
Connection cable for analyzer 20 m
Stainless steel tag plate
Pipe mounting hardware (SUS)
Conduit adapter G1/2×3 pcs
Conduit adapter 1/2 NPT×3 pcs
Conduit adapter M20×1.5×3 pcs
Pressurized head tank for low turbidity (for 2 NTU or less)
Simple head tank (for over 2 NTU to 10 NTU)
Head Tank (for over 2 NTU)
One-touch connector (8 mm OD)
One-touch connector (1/4 inch OD)
ANSI standard connection
l Accessories
Name Q´ ty Remarks
Desiccant 14 pcs/Q’ty (Part number: K9657RJ)
Check tool 1
Silicone Cloth 1
Plug 2
l Spare parts
Name Part No. Description Q´ ty Frequency of Replacement
LED (red light) K8003DN for -NT, 660 nm Light source 13 years
LED (Infrared light) K8003DP for -FN, 860nm Light source 13 years
Desiccant * K9657RJ 1Yearly
Gasket K8003NR 1Yearly
FUSE A1633EF 1(*1)
FUSE A1624EF for -A5 2(*1)
Filter Element, 1 μm K9008ZD 1Yearly
Filter Element, 0.2 μm K9726EH 1Yearly
(*1) Use within a year after purchasing.

<1. OVERVIEW>
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IM 12E01B30-02EN 2nd Edition : June 09 , 2021-00
l Head Tank
Name Part No. Description
Pressurized head tank for low turbidity K8003WA 2 NTU or less, same as option code /D1
Simple head tank K8003YA over 2NTU to 10NTU, same as option code /D2
Head tank K9658MR over 2 NTU, same as option code /D3
1.5 External Dimensions
See TB820D General Specication GS 12E01B30-01EN.
1.6 Measurement principle
TB820D Turbidity detector uses the right angle scattered light method to continuously measure
the turbidity of your samples. When Sample is irradiated with light, the incident light is scattered
by the turbidity particle.
TB820D measures turbidity by using 660 nm or 860nm monochromatic light as the light source
and detecting light scattered in the sample in the 90-degree direction.
Scattered light intensity is calculated by light source intensity, turbidity and the structural
parameter of the unit. The equation is as follows.
Ls = K · Q · S
Where:
Ls: Scattered light intensity
K: Structural parameter (constant)
Q: light source intensity
S: Turbidity
TB820D continuously monitors the scattered light intensity (Ls) and light source intensity (Q) and
calculates the turbidity (S).

<2. INSTALLATION, PIPING, AND WIRING>2-1
IM 12B01B30-02EN 2nd Edition : June 09 , 2021-00
2. INSTALLATION, PIPING, AND WIRING
n Installation Location
The TB820D turbidimeter should be installed in a location:
• that is protected from direct sunlight and rain, i.e., the instrument should be installed indoors
or in a cubicle;
• that is subject to minimal mechanical vibration;
• where no corrosive gases are present;
• that is not exposed to high temperature and humidity. The temperature should be in the
range of -5 to 55°C, preferably at or around normal temperatures, and its uctuation small.
The humidity should be kept between 10 to 90%RH. Prevent condensation which may
occur if the sample temperature is lower than the ambient temperature. Also, take protective
measures to prevent a sample and the tap water from freezing, if necessary;
• that provides adequate maintenance space and easy access for maintenance work; and,
• where the drain is provided.
n Installation Dimensions
Install the TB820D’s detector unit in pipes or walls using their special mounting brackets,
respectively. Note that these mounting brackets are supplied only when specied.
l Pipe Mounting (Option Code “/U”)
For information on the converter, read FLXA402T IM.
54 141
128 Unit: mm
Mounting 2-inch pipe
(ø60.5)
l Wall Mounting (Install the detector with four M5 screws)
For information on the converter, read FLXA402T IM.
100
2-R3
2-R3
160
Unit: mm

<2. INSTALLATION, PIPING, AND WIRING>
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IM 12B01B30-02EN 2nd Edition : June 09 , 2021-00
2.1 Wiring
See Figure 2.1 or Figure 2.2 for wiring of TB820D.
For external wiring of FLXA402T, read FLXA402T Operation of Converter IM 12A01G01-02EN
section 2.5.
(201)L
(202)N
(002)G
U1
U2
U3
S
L
N
G
(32)NC
(31)C
(33)NO S1
(42)NC
(41)C
(43)NO S2
(72)NC
(71)C
(73)NO S4
(61) +
(62) -
mA1
(65) +
(66) -
mA2
(81) +
(82) -
mA3
(85) +
(86) -
mA4
(21)
(22)
(24)
SHLD(63)
(87) +
(88) -
SHLD(89)
A+(91)
B-(92)
GND(93)
SHLD(94)
Termination (95)
(52)NC
(51)C
(53)NO S3
Power
2nd input
(-TB, -P1, -C1)
1st input
(82)SHLD
(86)GND
(83)B-
(84)A+
(87)V5
L(101)
N(102)
G(001)
Power
Ultra Sonic
Converter
RELAY
SENCOM
Internal
US terminal
L(301)
N(302)
G(003)
L1
L2
G
*2
*2
*3*3
TB820D-□□-□□-NN
FLXA402T
Liquid Analyzer for Turbidity and Chlorine
Analog output (-N2, -N4)
Analog output (-N2, -N4)
Analog output (-N4)
Analog output (-N4)
Contact input (-N2, -N4)
Analog input (-N4)
RS485 (-R)
Ethernet (-E)
Contact output
(-WR)
TB820D
Right Angle Scattered Light Turbidity Detector
PG400
Pulse Generator for Clean Unit
Power
supply
*1
*1: Power terminal "G" on TB820D must be grounded (ground resistance: 100 ohm or less).
In case of selecting -NN as Relay box for solenoid valve, power supply cable connects with L(101), N(102)
and G(001) in TB820D.
*2: The connection cables are 1 m in length normally.
They are available with /L02, /L03, /L05, /L10 or /L20 depending on the length you need.
*3: When suffix code -U1 is specified, PG400 should be purchased separately.
Neither Ultrasonic oscillator cables nor power cable are supplied with the product. Purchase them separately.
See GS 19C01B05-01EN.
Power supply
cable (C) Power cable for FLXA402T (B)
SENCOM cable for Turbidity and chlorine (A)
Power cable for PG400 Oscillator cable
Figure 2.1 Wiring TB820D-□□-□□-NN

<2. INSTALLATION, PIPING, AND WIRING>2-3
IM 12B01B30-02EN 2nd Edition : June 09 , 2021-00
(201)L
(202)N
(002)G
U1
U2
U3
S
L
N
G
(32)NC
(31)C
(33)NO S1
(42)NC
(41)C
(43)NO S2
(72)NC
(71)C
(73)NO S4
(61) +
(62) -
mA1
(65) +
(66) -
mA2
(81) +
(82) -
mA3
(85) +
(86) -
mA4
(21)
(22)
(24)
SHLD(63)
(87) +
(88) -
SHLD(89)
A+(91)
B-(92)
GND(93)
SHLD(94)
Termination (95)
(52)NC
(51)C
(53)NO S3
Power
2nd input
(-TB, -P1, -C1)
1st input
(82)SHLD
(86)GND
(83)B-
(84)A+
(87)V5
L(101)
N(102)
G(001)
Power
Ultra Sonic
Converter
RELAY
SENCOM
Internal
US terminal
L(301)
N(302)
G(003)
L1
L2
G
(12)
(13)
L(101)
N(102)
G(001)
Power
L(201)
N(202)
G(002)
Detector
L(301)
N(302)
G(003)
Converter
(21)
(22)
Wash
Measure
(31)
(32)
Zero
(41)
(42)
Drain
CN1
SV1 *4
SV2 *4
SV3 *4
SV4 *4
*2
*2
*3*3
TB820D-□□-□□-A5
FLXA402T
Liquid Analyzer for Turbidity and Chlorine
Analog output (-N2, -N4)
Analog output (-N2, -N4)
Analog output (-N4)
Analog output (-N4)
Contact input (-N2, -N4)
Analog input (-N4)
RS485 (-R)
Ethernet (-E)
Contact output
(-WR)
TB820D
Right Angle Scattered Light Turbidity Detector
PG400
Pulse Generator for Clean Unit
Power
supply
*1
Power supply cable (C) Relay box
*1: Power terminal "G" on Relay box must be grounded (ground resistance: 100 ohm or less).
In case of selecting -A5, power supply cable connects with L(101), N(102) and G(001) in Relay box.
*2: Connection cables are 1 m in length normally.
They are available with /L02, /L03, /L05, /L10 or /L20 depending on the length you need.
*3: When suffix code -U1 is specified, PG400 should be purchased separately.
Neither Ultrasonic oscillator cables nor power cable are supplied with the product.
Purchase them separately. See GS 19C01B05-01EN.
*4: In case of selecting -A5, purchase the solenoid valve corresponding input power supply and frequency.
See ●Solenoid valve (SV1 to SV4).
Cable for SV (F)
Power cable for FLXA402T (B)
SENCOM cable for Turbidity and chlorine (A)
Cable for Relay box control
Power cable for Smart unit (D)
Power cable for PG400
Oscillator cable
Figure 2.2 Wiring TB820D-□□-□□-A5
CAUTION
Turn o󰀨 power supply to TB820D before wiring. Power rating must comply with TB820D
specications. Power voltage must match with the one indicated on the name plate.

<2. INSTALLATION, PIPING, AND WIRING>
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IM 12B01B30-02EN 2nd Edition : June 09 , 2021-00
WARNING
● You must install external power supply switch or circuit breaker for power supply.
● The external power supply switch or a circuit breaker must comply with a current rating of
5Aor IEC60947-1 or IEC60947-3
● Yokogawa recommend installing the external power supply switch, circuit breaker and
TB820D all in the same location.
● Install the external power supply switch or circuit breaker to the place where operators
access easily. To alert users, put a label on the external power switch.
● Fix securely onto constructions or walls all power lines including wire cables of power supply
by using stanchion, cable rack, conduit or vinyl band.
Unplugged cables are dangerous and may cause an electric shock.
CAUTION
● When you open the front cover, make sure the screws are completely out of the screw
holes, and then open the front cover 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.
● Don’t lose the four screws of the front cover.
When wiring TB820D, rst remove the cover of the smart unit. Provide the wiring with the cover
removed. The product is shipped with cable gland attached to the cable entry.
When protecting cables with conduits, use conduit adapters (option code: /CB3, /CD3, /CF3)
For how to provide conduit adapters, see FLXA402T Installation and Wiring IM 12A01G01-02EN
section 2.4.

<2. INSTALLATION, PIPING, AND WIRING>2-5
IM 12B01B30-02EN 2nd Edition : June 09 , 2021-00
clamp
SENCOM cable for Turbidity and chlorine (A)
Cable for Relay box control (E)
Power cable for PG400
Smart unit
Detection unit
Oscillator cable
Power cable for FLXA402T (B)
Power supply cable (C)
View from the bottom
Figure 2.3 Wiring TB820D Smart unit side
LN
G
For IO module
For sensor modules
For relay module
For COM module
Power cable
for FLXA402T (B)
SENCOM cable
for Turbidity and chlorine (A)
M3 screw
M4 screw
Figure 2.4 Wiring FLXA402T side
WARNING
Never let the power cable touch SENCOM cable, resulting in failure to comply with safety
requirements.

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IM 12B01B30-02EN 2nd Edition : June 09 , 2021-00
WARNING
● Use wiring cables with heat resistance above 75 °C, waterproof rating IP65 or higher.
● Tightening torque to the four screws of Smart Box cover is 1.4 N·m.
● For power supply, wire cables with a ammability rating of UL 2556 VW-1 or equivalent
CAUTION
• When you open the front cover of FLXA402T, make sure the screws are completely out of
the screw holes, and then open the front cover 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 screws on the front cover of the FLXA402T.
2.1.1 SENCOM cable for turbidity and chlorine (A)
Dedicated cable is supplied with the product. For the wiring of FLXA402T, read FLXA402T
Installation and Wiring IM 12A01G01-02EN section 2.6.1.
2.1.2 Power cable for FLXA402T (B)
Dedicated cable is supplied with the product.
Both ends are terminated at di󰀨erent lengths. Connect the longer one (approx. 80 mm) to Smart
unit side, the shorter one (approx. 50 mm) to FLXA402T side.
Cables have no name on them so wire them by color: L; Black, N; White, G; Red.
Fasten the M3 screw (L, N) (Figure 2.8) with the tightening torque of 0.6 N·m, M4 screw (G) with
1.4 N·m.
2.1.3 Power supply cable (C)
WARNING
● You must install external power supply switch or circuit breaker for power supply.
● The external power supply switch or a circuit breaker must comply with a current rating of
5Aor IEC60947-1 or IEC60947-3
● Yokogawa recommend installing the external power supply switch, circuit breaker and
TB820D converter all in the same location.
● Install the external power supply switch or circuit breaker to the place where operators
access easily. To alert users, put a label on the external power switch.
● Fix securely onto constructions or walls all power lines by using cable rack, conduit or vinyl
band. Unplugged cables are dangerous and may cause an electric shock.
Provide the smart unit with a power supply whose voltages and frequencies conform to the
specications. Grounding wiring also must be made to prevent electric shock and to prevent the
instrument from being a󰀨ected by noise. Power supply and grounding cable must be provided by
customers. The specication of the cables is described in the following table.

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IM 12B01B30-02EN 2nd Edition : June 09 , 2021-00
Table2.1 Specication of power cable
Rated voltage 300V or above
Rated temperature 75°C or above
Number of cores, Wire diameter 3
L, N, G: 0.75 to 2.5 mm2(AWG18 to14)
Sheath outer diameter Ø6.5 to Ø12.5 mm
Cable termination Strip the outer sheath of 80 mm, provide the termination.
L, N: M3 round terminal
G: M4 round terminal
Connect the power supply cable to the terminal. Refer to Figure 2.8.
This instrument does not have a power supply switch. The power supply line must be equipped
with a double switch. Grounding wiring connected to the smart unit shall satisfy Class D
(grounding resistance: 100 Ω or less). Fasten the M3 screw (L, N) with the tightening torque of
0.6 N·m, M4 screw (G) with 1.4 N·m. (Figure 2.8)
2.1.4 Wiring with PG400
When the su󰀩x code -U1 (Ultrasonic cleaning) is specied, PG400 Pulse Generator for Clean
Unit is supplied with the product.
For PG400, read PG400 User's Manual IM 19C01B05-01EN.
Provide wiring of Oscillator cable and Power cable for PG400, by referring to Figure 2.1 or Figure
2.2-Figure 2.3.
Connect the Cable for PG400 to Detection unit, not to Smart unit of TB820D.
Connect the connector as shown on the left in Figure 2.5 and thread it through the clamp as
shown on the right. Make sure that the connector part is above the clamp. Run the cable along
the side of the housing and lay it in the back.
clamp
Figure 2.5 Cable for PG400
2.1.5 When Relay box for solenoid valve is included
When the su󰀩x code -A5 (Relay box for solenoid valve) is specied, a Relay Box is included as
shown in the Figure 2.2. Wire the cables of Power cable for Smart unit (D), Cable for Relay box
control (E), and Cable for SV (F).
Ground Terminal
101
102
201
202
301
302
Power supply cable (C)
Cable for SV (F)
Power cable for FLXA402T (B)
View from the bottom
Cable for SV control (E)
Power cable for Smart unit (D)
SV3 cable
SV2 cable
SV1 cable
SV4 cable
Figure 2.6 Wiring Relay Box

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n Power cable for Smart unit (D)
Dedicated cable is supplied with the product.
Table 2.2 Power cable for Smart unit
Cable color Relay Box terminal No. Smart Unit terminal No.
Black (L) 201 101
White (N) 202 102
Red (G) 002 001
Fasten the M3 screw (L, N) with the tightening torque of 0.6 N·m, M4 screw (G) with 1.4 N·m.
(Figure 2.6)
n Cable for Relay box control (E)
Dedicated cable is supplied with the product.
Connect to the designated connector by referring to Figure 2.2, Figure 2.6.
n Cable for SV (F)
Solenoid valve and solenoid valve cable are provided by customers. See Table 2.4 and Table 2.7
for the required specications. Yokogawa also provides these products.
Solenoid valve is not supplied with Relay box for solenoid valve. Purchase separately an
appropriate solenoid valve.
Table 2.4 Requirement for sampling system
Port size Valve type Max. working
pressure
Max. Working
pressure di󰀨erential
SV1 Rc 1/2 N.O.(*1) ≥ 1.5 MPa ≥ 0.7 MPa
SV2, 3 Rc 1/4 N.C. (*2) ≥ 5.0 MPa ≥ 0.4 MPa
SV4 Rc 3/8 N.C. (*2) ≥ 2.0 MPa ≥ 1 MPa
*1: Valve closes when energized.
*2: Valve opens when energized.
Table 2.5 Example
Voltage 100 V 200 V 220 V
SV1 Part number B1043ET B1045ET B1046ET
Model code VXZ2B2GH VXZ2B2GK VXZ2B2GZ1G
Manufacturer SMC Corporation
SV2, 3 Part number B1035ET B1037ET B1038ET
Model code AB41-02-6-
D2GSAC100V-ST
AB41-02-6-
D2GSAC200V-ST
AB41-02-6-
D2GSAC200V-ST
Manufacturer CKD Corporation
SV4 Part number B1031ET B1033ET B1034ET
Model code ADK11-10A-
D2GSAC100V-ST
ADK11-10A-
D2GSAC200V-ST
ADK11-10A-
D2GSAC220V-ST
Manufacturer CKD Corporation
Table 2.6 Recommended cable for solenoid valve
Part number K8004TH (for SV1), K8004TJ (for SV2), K8004TK (for SV3), K8004TL (for SV4)
Cable length 1.2 m
Rated voltage 300 V
Specication AWG20 2-core cable, M3 round terminal

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Table 2.7 Specication of Solenoid valve cable
Cable length (*) 3000 mm or less (*1)
Rated voltage 300V or above
Rated temperature 75°C or above
Specication AWG 20 2-core cable
Sheath outer diameter Ø6.5 to Ø12.5 mm
Cable termination On the terminals of Terminal Box, strip the outer sheath
of 80 mm, provide the termination M3 round.
On the solenoid valve terminals, the cable termination
varies depending on the type of terminal.
(*) The specication shall be satised to comply with EMC regulation.
Connect the cable for SV by referring to Figure 2.2 and Figure 2.7.
2.2 Piping
There are three piping methods in accordance with the system conguration.
(1) A system using an open head tank (/D3)
(2) A system using a Simple head tank (/D2)
(3) A system using a pressurized head tank (/D1)
(4) A system without a head tank
Depending on the application, select the appropriate system conguration, and install pipes
accordingly following the procedure described below.
2.2.1 System Using an Open Head Tank (/D3)
This is a typical system and the piping diagram is shown in Figure 2.20. Air bubbles in a sample
are removed by an open head tank and the sample is introduced into the detector at a stable ow
rate. Calibration and maintenance such as measurement cell cleaning are e󰀩ciently performed
by valve operation. An optional Open head tank (option code “/D3”), shown in Figure 2.20, is
available from Yokogawa.
Approx.
288
4-ø6.2 holes
(for fixing)
40
9.5
Approx.
205
2-Ø10 holes
(for fixing)
Ø26/Ø19 PE tube coupling
Ø22/Ø15 PE tube coupling
Head tank sample inlet 110
320
Drain
70
280
110
VP20 Pipe
Head pipe drain
Ø22/Ø15 PE tube
Coupling
Sample outlet
Sample inlet Ø22/Ø15
PE tube coupling
30
Unit: mm
Figure 2.20 Open Head Tank (/D3)