YOKOGAWA FLXA402 User manual

User’s
Manual Model FLXA402
4-Wire Converter
Opeartion of ISC
IM 12A01F04-01EN
IM 12A01F04-01EN
1st Edition

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IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
uIntroduction
Thank you for purchasing the FLXATM402 4-Wire Converter.
This Instructor’s Manual contains all essential information for the user to make full use of
FLXA402.
Please read the following respective documents before installing and using the FLXA402.
The related documents are listed as follows.
General Specications
Contents Document number Note
FLXA402 4-Wire Converter GS 12A01F01-01EN Online manual
“EN” in the document number is the language code.
User’s Manual
Contents Document number Note
FLXA402 4-Wire Converter
Start-up and Safety Precautions IM 12A01F01-01EN Attached to the product (printed manual)
FLXA4024-Wire Converter
Installation and Wiring IM 12A01F01-02EN Online manual
FLXA402 4-Wire Converter
Operation of Converter IM 12A01F01-03EN Online manual
FLXA402 4-Wire Converter
Operation of pH/ORP IM 12A01F02-01EN Online manual
FLXA402 4-Wire Converter
Operation of SC IM 12A01F03-01EN Online manual
FLXA402 4-Wire Converter
Operation of ISC IM 12A01F04-01EN Online manual (This manual)
FLXA402 4-Wire Converter
Operation of DO IM 12A01F05-01EN 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
FLXA402 4-Wire Converter
HART communication TI 12A01F01-61EN Online manual
FLXA402 4-Wire Converter
MODBUS communication TI 12A01F01-62EN 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/xa402/download/
Media No.IM 12A01F04-01EN 1st Edition : Nov. 2018 (YK)
All Rights Reserved Copyright © 2018, Yokogawa Electric Corporation

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IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
n Notes on Handling User’s Manuals
• Please provide the user’s manuals to your end users so that they can keep the user’s
manuals for convenient reference.
• Please read the information thoroughly before using the product.
• The purpose of these user’s manuals is not to warrant that the product is well suited to any
particular purpose but rather to describe the functional details of the product.
• No part of the user’s manuals may be transferred or reproduced without prior written
consent from YOKOGAWA.
• YOKOGAWA reserves the right to make improvements in the user’s manuals and product at
any time, without notice or obligation.
• If you have any questions, or you nd mistakes or omissions in the user’s manuals, please
contact our sales representative or your local distributor.
n Drawing Conventions
Some drawings may be partially emphasized, simplied, or omitted, for the convenience of
description.
Some screen images depicted in the user’s manual may have di󰀨erent display positions or
character types (e.g., the upper / lower case). Also note that some of the images contained in this
user’s manual are display examples.
n Composition of this User’s Manual
FLXA402, a modular-designed converter, is a multi- parameter instrument o󰀨ering a wide
range of measurement choices; such as: pH/ORP (oxidation-reduction potential), Resistivity/
Conductivity (SC), Inductive conductivity (ISC), Dissolved Oxygen (DO) – with the respective
sensor module.
For specication of SC, see GS 12A01F01-01EN.
This user’s manual contains general description and precautions of the instrument.
The table below shows user’s manuals to read concerning the instrument’s operation,
conguration, or calibration, which vary depending on its installation, wiring, and specication of
each instrument.
Contents pH/ORP
SENCOMTM SA
Contacting
conductivity (SC)
Inductive
conductivity (ISC)
Dissolved oxygen
(DO)
Introduction and
general description IM 12A01F01-02EN
Wiring and installation IM 12A01F01-02EN
Converter operation
(Setting, Calibration)
Maintenance,
Troubleshooting
IM 12A01F01-03EN
Sensor operation
(Setting, Calibration) IM 12A01F02-01EN IM 12A01F03-01EN IM 12A01F04-01EN IM 12A01F05-01EN
n Trademark Acknowledgments
• FLEXA, FLXA, SENCOM and FieldMate 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 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
n Terminology
sensor(s): sensors, sensors with SA11, sensor module(s)
SENCOM SA SA11, SENCOM Smart Adapter or “-S5” (SENCOM SA) of 1st or
2nd input
analog sensor (module) selectable sensors when -P1/-C1/-C5/-D1 is specied for 1st or
2nd input, e.g. SC4AJ, SC8SG, SC210G
NE107: NAMUR NE107
see the section 4.7 Error settings in IM 12A01F01-03EN
Operation of Converter

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IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
Model FLXA402
4-Wire Converter
Operation of ISC
CONTENTS
IM 12A01F04-01EN 1st Edition
uIntroduction....................................................................................................i
1. Sensor Menu Outline ............................................................................... 1-1
2. Sensor menu............................................................................................. 2-1
2.1 Details................................................................................................................. 2-2
2.2 Calibration ......................................................................................................... 2-6
2.3 Reset wellness .................................................................................................. 2-6
2.4 Reset .................................................................................................................. 2-7
2.5 Sensor settings ................................................................................................. 2-7
3. Sensor setting........................................................................................... 3-1
3.1 Congure sensor .............................................................................................. 3-2
3.1.1 Sensor setting .................................................................................... 3-2
3.1.2 Temperature settings ......................................................................... 3-2
3.1.3 Others ................................................................................................ 3-2
3.2 Measure setting................................................................................................. 3-2
3.2.1 Method (SC)....................................................................................... 3-2
3.2.2 Temperature settings ......................................................................... 3-4
3.2.3 Temperature compensation............................................................... 3-4
3.2.4 Concentration table............................................................................ 3-5
3.2.5 High/Low alarm setting ...................................................................... 3-6
3.3 Calibration settings .......................................................................................... 3-7
3.3.1 Limits and timing ................................................................................ 3-7
3.3.2 Cal. Set others ................................................................................... 3-7
3.3.3 Cal. set temperature .......................................................................... 3-8
3.4 Wellness settings.............................................................................................. 3-9
3.4.1 Dene SENCOM status..................................................................... 3-9
4. Calibration of ISC (Inductive Conductivity)............................................................ 4-1
4.1 Cell constant (manual) ..................................................................................... 4-4
4.2 Cell constant (automatic) ................................................................................. 4-4
4.3 Air calibration .................................................................................................... 4-5
4.4 Sample ............................................................................................................... 4-5
4.5 Temperature coe󰀩cient ................................................................................... 4-6
4.6 Temperature calibration ................................................................................... 4-6
Appendix For ISC (Inductive Conductivity) ..............................................App.1-1
Revision Record.......................................................................................................i

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<1. Sensor Menu Outline> 1-1
IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
1. Sensor Menu Outline
Main/Home screen > “Sensor menu”. > “Detail”, “Calibration”, “Setting” are available.
The operation is secured by password. See IM “Operation of Converter”.
Sample image of “Sensor menu”
n Sensor detail
On Sensor menu, tap “Detail”. Read 2.1.
Figure 1.2 Sample image of “Detail”(Sensor menu>Detail)
nCalibration
On Home/Main screen, tap . On Sensor menu, tap for calibration of sensors.
Figure 1.3 Sample image of Calibration
For information on calibration of sensors, see Chapter 4.
n Wellness reset
Go to Sensor menu> tap . Read 2.3.
n Sensor reset
On Sensor menu, tap . Read 2.4.

<1. Sensor Menu Outline> 1-2
IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
n Congure sensor
Converter menu or Sensor menu > “Setting”
Go to Converter menu to congure the setting of converter such as mA output, display setting.
Go to Sensor menu to congure the sensor related setting such as calibration setting.
Figure 1.4 Sensor conguration (parameter list)
Select a parameter to change. The parameter becomes highlighted.To overwrite the data, tap
Read Chapter 3 about sensor conguration.

<2. Sensor Menu> 2-1
IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
2. Sensor menu
Main screen > Sensor menu
The following operation are available.
Detail (details on sensors)
Calibration (sensor calibration)
Setting (sensor setting)
etc.
3.1 3.2 3.3
3.53.4
Figure 2.1 Sensor menu (sample)

<2. Sensor Menu> 2-2
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2.1 Details
Go to Sensor menu > “Detail” to check detailed instrument information (instrument information
such as setup, sensor diagnosis, calibration, and module production number) through a transition
of screens.
In case of trouble, when you contact Yokogawa service, please inform us of the module and
FLXA402 software revision displayed on the Detail and module production number, revision
number indicated on the nameplate attached to the instrument.
*1
*2
Figure 2.2 Sensor menu ow chart
*1: “----”is displayed, depending on a measurement status.

<2. Sensor Menu> 2-3
IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
*2: The number of log page goes as many as the connected sensors.
n Measurement value
lc.c. (factory)
This parameter displays the cell constant. (factory setting)
The cell constant (factory setting) is determined by factory calibration made during sensor
manufacturing. This value can be set in Congure sensor > c.c. (factory)
The cell constant is indicated on the sensor or cable label.
l c.c. (adjusted)
This parameter displays the cell constant (adjusted).
The cell constant (adjusted) has been calibrated and is set by calibration action.
When the system’s cell constant is adjusted on-line by calibration using a process solution or
bu󰀨er solution, a new cell constant is logged here.
The di󰀨erence between this value and the default value set at factory shipment should not be
large. Should it be large, check and be sure there is no broken or contamination.
lTemp. comp. 1
This parameter shows the temperature compensation method for 1st measurement. The setting
is made in Setting > Measure setting >SC1 sel./comp.
lTemp. comp. 2
This parameter shows the temperature compensation method for 2nd measurement. The setting
is made in Setting > Measure setting >SC2 sel./comp.
2nd measurement does not imply that two measurements can be made individually, but it means
that two types of compensation methods can be congured, which enables two phases to be
monitored accurately in the same process. For instance, the switching between process and
washing solutions can be monitored.
l Sensor Ohms
Non-compensated resistivity of sensors
n Sensor wellness
Sensor wellness shows the soundness of a module. The larger number of nappears in
each gauge, the more sound the parameter concerned is. A gauge is indicated for only those
parameters whose sensor wellness setting is “enabled, “while a bar (----) is displayed if the
sensor wellness setting is “disabled.”
When analog sensor module is in use, if Impedance measurement (A) is set to “Disabled”, “----”is
displayed, even if Impedance wellness is “Enabled”.
For Sensor wellness, go to Sensor menu > Congure sensor > Wellness settings
See 3.4 for the details.
When a sensor or an electrode is exchanged or replaced, sensor wellness data should be reset.
Use Reset welness in Sensor menu. See 2.3.

<2. Sensor Menu> 2-4
IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
n SENCOM Sensor status
The status of the sensor is displayed.
l Max temp. exposed
Displays the maximum temperature, which is automatically updated every time a higher
temperature is measured.
lSterilization
Displays the number of times the temperature remains above the preset value for at least the
prescribed time period (min.).
Go to Sensor menu > Congure sensor > Wellness settings > Dene SENCOM status
An example of sterilization
User-defined sterilization time
User-defined
sterilization
temperature
Time
(min)
Temperature (°C)
a b c
Figure 2.3 Sterilization
a: does not count, because the length of time that the temperature exceeds the sterilization
temperature is shorter than the length of sterilization time.
b: counts, because the length of time that the temperature exceeds the sterilization
temperature is longer than the length of sterilization time.
c: counts, because the length of time that the temperature exceeds the sterilization
temperature is longer than the length of sterilization time.
If the temperature exceeds the sterilization temperature longer than the length of
sterilization time consecutively, the event counts as one.
The last time when the event counts is displayed as a last sterilization date/time.
Counter indicates a maximum of 9999. After the counter reaches the maximum, if the
requirements to count is satised, the data of last sterilization date and time is updated.
l High temp 1 total, High temp 2 total, Last date of High temp1/temp2,
To dene the temperature of “High temp 1” and “High temp 2”, go to Sensor menu > Congure
sensor > Wellness settings > Dene Sencom status
The total length of time that the measured temperature exceeds the dened High temp 1 or High
temp 2.
Displays the total time during which the temperature remains over the high temperature 1 or 2.
The last date and time (the end of high-temperature condition) is displayed as the “last date. “Up
to 10 years (87600 hours) can be counted. Even after that, the “last date” is updated if the event
meets the conditions.

<2. Sensor Menu> 2-5
IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
n Predict. maintenance
l Last calibrated at
Date on which the last sensor calibration was performed. The displayed value of “ c.c.(adjusted)”
is renewed to the date and time of last calibration.
lCalibration due at
Date when the calibration must be done next according to the settings of the calibration interval.
To set the calibration intervals, go to Sensor menu > Calibration settings > Limits and timing
>Calib. interval. See 3.3.3 for details.
l Projected maintenance
The projected maintenance function predicts the date when the sensor unit will need recalibrating
for maintaining measurement accuracy. The function checks contamination level of sensors by
monitoring after-calibration constant cell. Clean the sensor before the predicted date.
Projected maintenance date is displayed in a format of projected maintenance(status).
As shown in the gure below, the date is predicted based on the intersection point of the upper or
lower limits and the extrapolated line of the values obtained by the least squares method.
Day
Impedance 2
Value
Lower limit
Upper limit
Current
date
Projected
maintenance date
Figure 2.4 Projected maintenance
The status shows the certainty of the projected maintenance date in terms of the correlation
coe󰀩cient R. Table 2.1, Table 2.2 shows pattern of the projected maintenance date, status.
Table Display pattern of the projected maintenance date
Projected
date ---- 0-1 month 1-3 months 3-6 months 6-12 months Over 1 year
- - : not predictable due to insu󰀩cient data
Table Display pattern of the status
Status (- - - - -) (Poor) Reasonable) (Excellent)
Criteria (R < 0.50) (0.50 ≤ R < 0.70) (0.70 ≤ R < 0.85) (0.85 ≤ R < 1.00)
nISC module
This screen enables operators to check the module Serial No., Hardware Rev, Software Rev.
n Converter log, Sensor log
Same as Converter log in IM -Operation of Converter. See “Converter log” in IM “Operation of
Converter.”
Same display as on the converter “Detail”.
See 3.1 in IM 12A01F01-03EN Operation of Converter.

<2. Sensor Menu> 2-6
IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
2.2 Calibration
Sensor menu > Calibration . Read Chapter 5.
Figure 2.5 Calibration selection
If you have a password, a prompt dialog box appears to input your password. After the password
is veried, the page shifts to Calibration.
For password, see 5.4 in IM 12A01F01-03EN Operation of Converter.
2.3 Reset wellness
Sensor menu > Reset wellness
A dialog box appears to ask if you want to reset sensor wellness data.
Yes: the wellness is reset
No-: the reset will not take place. The page switches to Sensor menu.
If you created a password, a prompt dialog box appears to input your password. After the
password is veried, a dialog appears to conrm if you want to reset. For further information on
password, read IM-Operation of Converter.

<2. Sensor Menu> 2-7
IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
2.4 Reset
Sensor menu > Reset
The screen jumps to Load SC cong. File screen.
While Wash is in progress, “Reset” is invalid. Even if you tap the icon, you will not jump to the
sensor reset screen.
Figure 2.7 Sensor reset
In the box of File name, name of dened sensor cong. le to load is displayed, after sensors
connected are automatically detected. You cannot change the le name.
If you tap “Execute”, the loading starts. When the loading ends, you will return to Sensor menu.
If you create a password, a prompt dialog box appears to enter the password. After the password
is veried, Sensor reset screen appears.
For password, see 5.4 in IM 12A01F01-03EN Operation of Converter.
If you go to Sensor reset screen, mA output becomes HOLD, and contact output keeps the
current status.
2.5 Sensor settings
Sensor menu > Sensor setting
When Wash is in progress, the character row is displayed in color. You cannot move to Sensor
settings.
For further information on sensor settings, read chapter 3.
Figure 2.8 Sensor settings
If you create a password, a prompt dialog box appears to enter the password. After the password
is veried, Sensor setting is displayed.
For password, see 5.4 in IM 12A01F01-03EN Operation of Converter.
If you go to Sensor setting, the mA output becomes HOLD, and contact output keeps the current
status.

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<3. Sensor Setting> 3-1
IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
3. Sensor setting
When you congure each setting, ll in User setting table we provide, and keep it in safe place.
Download the user setting table from our website below.
http://www.yokogawa.com/an/xa402/download/
Congure sensor setting
Go to Main screen > Sensor menu > Sensor setting
You can conrm or edit the setting. When you go to Sensor setting, mA output becomes HOLD,
and contact output keeps the current status.
Figure 3.1 Sensor menu to Sensor setting
To know how to conrm or edit the settings with parameters, refer IM 12A01F01-03EN Operation
of Converter.
In the parameter list of Sensor setting, parameters with (A) or (S) represent (A) for Analog sensor
module, (S) for exclusively SENCOM SA.
You cannot congure parameters which do not apply to the sensors to be used.
When you congure sensor setting and save the data, a dialog box appears to notify the
operation is in progress. If you succeed the conguration, you will return to parameter list, and if
fail, a fail dialog appears.

<3. Sensor Setting> 3-2
IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
3.1 Congure sensor
Congure the setting of sensors, which connects to FLXA402.
3.1.1 Sensor setting
n Measuring unit
Either /cm or /m can be chosen here.
The process values will be expressed in S/cm or S/m in conductivity mode.
nc.c. (factory)
The cell constant given at factory shipment is set. The cell constant is indicated on the sensor
nameplate.
When a new sensor is connected, set the new cell constant which is indicated on the sensor.
When a cell constant is changed, a calibrated cell constant (c.c. (adjusted)) will be the same
value of the new cell constant (factory) after resetting an old one.
3.1.2 Temperature settings
nTemp. element
Select the temperature element used for compensation from among Pt1000 or NTC30k. Select
the same type as the temperature element that is actually connected.
3.1.3 Others
n MODBUS address (S)
You can change MODBUS address only when SENCOM SA is in use.
3.2 Measure setting
Set parameters for measurement.
3.2.1 Method (SC)
Select a temperature compensation method for SC main parameters.
nConductivity
Temperature compensation method : SC1 (Temp. comp. 1), SC2 (Temp. comp. 2)
● SC1 sel./comp.: Cond. (Uncomp.), Cond. (TC1), Cond. (NaCl), Cond. (Matrix1)
● SC2 sel./comp.: Cond. (Uncomp.), Cond. (TC2), Cond. (NaCl), Cond. (Matrix2)Resist.
l Temp. compensation
Select a method of temperature compensation from “Uncomp.”, “TC”, “NaCl”, “Matrix”. “Uncomp.”
does not call the temperature compensation.

<3. Sensor Setting> 3-3
IM 12A01F04-01EN 1st Edition : Nov. 20, 2018-00
●TC
This method uses the linear compensation function.
For how to calculate a temperature coe󰀩cient of the compensation function,
see “n Temperature compensation” on page App.1-1
●NaCl
This method uses the standard temperature compensation function with NaCl solution.
For details, see “n NaCl (standard temperature compensation)” on page App.1-1
●Matrix
This method uses the temperature compensation matrix, which is a table of the conductivity
values at di󰀨erent temperatures and concentrations for a specic solution. The measured
conductivity is compensated based on this matrix to the conductivity at the reference
temperature.
Prepared matrixes and user-dened matrixes can be used. Two di󰀨erent user-dened
matrixes are available.
For details, see “l Matrix” on page App.1-4
Note: The value of reference temperature “Tref”, which is dened in Matrix is used to compensate reference temperature only when
“User dened 1”or “User dened 2” are used. Note that the “Tref” is not used for temperature compensation.
When the measured temperature or the precompensated conductivity is out of the range, the
temperature compensation error (warning) will be issued. This is not a device error.
For more details, see “nTemperature compensation error” on page App.1-9
NOTE
The temperature compensation is not performed around zero conductivity. In this case, a warning
may be issued.