YOKOGAWA FLXA402 User Manual
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YOKOGAWA FLXA402 User Manual

4-wire converter opeartion of ph/orp
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User's
Manual
Model FLXA402
4-Wire Converter
Opeartion of pH/ORP
IM 12A01F02-01EN
IM 12A01F02-01EN
1st Edition

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  • Page 1 User’s Manual Model FLXA402 4-Wire Converter Opeartion of pH/ORP IM 12A01F02-01EN IM 12A01F02-01EN 1st Edition...

  • Page 2: Introduction

    402 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 Specifications...
  • Page 3 • 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 find mistakes or omissions in the user’s manuals, please contact our sales representative or your local distributor.
  • Page 4 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 specified for 1st or 2nd input, e.g. PH8E�P, PH4�, OR8E�G, SC4AJ, SC8SG, SC210G, ISC40GJ, ISC40SJ, DO30G.
  • Page 5 IM 12A01F02-01EN 1st Edition : Nov. 22, 2018-00...

  • Page 6: Table Of Contents

    Toc-1 Model FLXA402 4-Wire Converter Operation of pH/ORP IM 12A01F02-01EN 1st Edition CONTENTS Introduction ....................i Sensor Menu Outline ................1-1 Sensor menu ..................... 2-1 Detail ........................2-2 Calibration ......................2-9 Reset wellness ....................2-9 Reset ........................ 2-10 Sensor settings ....................2-10 Sensor setting ...................

  • Page 7: Im 12A01A02-01E 1St Edition : Nov. 22,

    Toc-2 Revision Record .......................i IM 12A01A02-01E 1st Edition : Nov. 22, 2018-00...

  • Page 8: Sensor Menu Outline

    <1. Sensor Menu Outline> Sensor Menu Outline Main/Home screen > “Sensor menu”. > “Detail” / “Calibration” / “Setting” The operation is secured by password. See the section 5.4 in IM 12A01F01-03EN Operation of Converter. Figure 1.1 Sample image of “Sensor menu” Sensor detail On Sensor menu, tap “Detail”.
  • Page 9 <1. Sensor Menu Outline> Configure sensor Converter menu or Sensor menu > “Setting” Go to Converter menu to configure the setting of converter such as mA output, display setting. Go to Sensor menu to configure the sensor setting such as calibration setting. Figure 1.4 Sensor configuration (parameter list) Select a parameter to change.

  • Page 10: Sensor Menu

    <2. Sensor menu> Sensor menu Main screen > Sensor menu The following operation are available. Detail (details on sensors) Calibration (sensor calibration) Setting (sensor setting) etc. Figure 2.1 Sensor menu (sample) IM 12A01F02-01EN 1st Edition : Nov. 22, 2018-00...

  • Page 11: Detail

    (setup, sensor diagnosis, calibration, and module production number). 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.
  • Page 12 <2. Sensor menu> Measurement value pH/ORP_Zero(1/2) Calibrated sensor offset in mV. Theoretically, the sensor reads 0 mV in a buffer solution of pH 7. The ZERO value indicates the condition of the sensor. The trend of ZERO drift of the sensor is used to predict the lifetime of the sensor.
  • Page 13 For a PH sensor, “Impedance” shows electrical resistance of the glass membrane electrode. The FLXA402 checks the impedance to know damage of the electrode. For an ORP sensor, “Impedance” shows electrical resistance of metal electrode. The FLXA402 checks the impedance to know the surface condition of smudge and the snapping of sensor wires.
  • Page 14 <2. Sensor menu> SENCOM Sensor status The status of the sensor is displayed. Max temp. exposed Displays the maximum temperature, which is automatically updated every time a higher temperature is measured. High pH total time/Low pH total time Displays the total time during which the pH value remains above the upper pH limit or below the lower pH limit.
  • Page 15 <2. Sensor menu> Predict. maintenance Last calibrated at Date on which the last sensor calibration was performed. The displayed value of the Zero is the result of this calibration. The displayed value of Slope was calibrated on this date only if the last calibration was a 2-point calibration.
  • Page 16 <2. Sensor menu> Projected replacement The projected replacement function predicts the date when the sensor will need replacing for maintaining the measurement accuracy, based on the pH zero and pH slope on each calibration, and Impedance 2 after each calibration. The projected replacement date is predicted based on these parameters stored upon calibration, and displayed the same as that of projected maintenance.

  • Page 17: Calibration

    <2. Sensor menu> Calibration Sensor menu > Calibration . See Chapter 4. Figure 2.6 Calibration selection If you have a password, a prompt dialog box appears to input your password. After the password is verified, the page shifts to Calibration. For password, see 5.4 in IM 12A01F01-03EN Operation of Converter.

  • Page 18: Reset

    <2. Sensor menu> Reset Sensor menu > Reset The screen jumps to Load PH config. File screen, where you can reset parameters of analog sensor module, SENCOM SA. While Wash is in progress, “Reset”is invalid. Even if you tap the icon, you will not jump to the sensor reset screen.
  • Page 19 2-10 <2. Sensor menu> IM 12A01F02-01EN 1st Edition : Nov. 22, 2018-00...

  • Page 20: Sensor Setting

    NOTE When setting parameters, FLXA402 features parameter reviewing function, which secures the parameter accuracy by network communication. You might find the end of a value you set edited. This does not affect any measurement or arithmetic.

  • Page 21: Configure Sensor

    <3. Sensor setting> Configure sensor Configure the setting of SENCOM SA and sensors, which connects to FLXA402. 3.1.1 Sensor type (A) Select sensor type from the following 3 types. When SENCOM SA is in use, the sensor type is automatically detected, thus you don’t need to set it.

  • Page 22: Others

    <3. Sensor setting> 3.1.3 Others MODBUS address (S) You can change MODBUS address only when SENCOM SA is in use. After changing MODBUS address, you need to change the configuration of the converter that connects to the system. To change the converter setting, go to Converter menu >...

  • Page 23: Measure Setting

    <3. Sensor setting> Measure setting Set parameters for measurement. 3.2.1 Temperature settings Unit Displays the unit for temperature, but you cannot change the setting here. To change the setting, go to Converter menu > Setting> Advanced setting > Other 3.2.2 Temp compensation Compensation This compensation of pH value is performed on the Nernst equation.
  • Page 24 <3. Sensor setting> 3.2.3 Method (pH) Select a temperature compensation method for pH measurement. “None” does not perform the temperature compensation. If “pH” is selected in “Sensor type”, choose process temperature compensation from among “None”, “TC”, “Matrix”, and “NEN6411”. Temp. coeff Temp.

  • Page 25: Orp

    <3. Sensor setting> 3.2.4 Method (ORP) ORP measurement involves no temperature input. No setting is required on the temperature compensation. Process temperature compensation is effective if “T.C. ORP mV/°C” in “Temp. Coef.”is set. Select from among “ORP1 (no compensation)”, “ORP1(TC)”, “ORP2 (no comp.)”, “ORP2 (TC)”, when you select “ORP”...

  • Page 26: Calibration Settings

    <3. Sensor setting> Calibration settings 3.3.1 Cal. set pH The screen flow differs depending on the combination of objects to be measured. Calibration settings for a pH converter involve slope (sensitivity), zero (aspot), and ITP (isothermal point). Figure 3.2 shows the pH value against the mV output of the sensor. The characteristic for pH measurement is an offset also known as aspot [mV] or zero [pH] and a Slope [%, mV/pH].

  • Page 27: Cal. Set Orp/Rh

    These data can be obtained from the manufacturer of the probe, by the users laboratory, etc. NOTE It is not always necessary to enter this data. In most cases, the FLXA402 automatically does this while performing calibration. Direct input is used when special electrode systems are used or the calibration in the process environment is not possible.

  • Page 28: Cal. Set Others

    • B is a value displayed on FLXA402 process. • C (current temperature offset) is confirmed on Temp. offset screen. When SA11 Smart Adapter is used with FLXA402, the following equation applies. Y=(B+C)-A where Y, B, C, A represent all the same as above mentioned.

  • Page 29: Wellness Settings

    3-10 <3. Sensor setting> Wellness settings This screen is used to set items relating to sensor diagnostics displayed on the Sensor wellness. Gauges are displayed for only parameters that have been enabled in Wellness settings. ”Parameters set to Disable are provided with a bar display. Figure 3.3 Sensor wellness The setting parameters include “Impedance settings”...
  • Page 30 The FLXA402 has an impedance check, which is capable of monitoring the impedance of various sensor systems. In order to “fine tune” this diagnostic tool, it is necessary to set it up to match the sensors used.
  • Page 31 Blank Page...

  • Page 32: Calibration Ph/Orp

    Calibration of “pH”, “ORP”, “rH” can be monitored on the calibration trend, while their measurement is being transitioned. Figure 4.2 Sample of Calibration trend If FLXA402 detects any sensor fault such as damage on temperature element, no calibration is implemented. NOTE Note the following when performing calibration with buffer solutions.

  • Page 33: Ph Calibration

    <4. Calibration pH/ORP> pH Calibration There are “pH Manual”, “pH Auto”, “Sample Cal.”. To “pH Manual”, and “pH Auto”, you can program “Favorite Calibration”. “Favorite Calibration” leads you directly to your programmed calibration, by tapping on Home/ Main screen. To program “Favorite Calibration”, go to Converter menu >...
  • Page 34 <4. Calibration pH/ORP> Zero/slope/ITP(3 pts) This calibration type is ITP-type three-point calibration. If ITP is not pH 7, three-point calibration is performed to obtain the zero (asymmetry), slope (sensitivity), and ITP (isothermal point) for calibration. Limitations • Three different buffer solutions whose difference in pH value between buffer solutions is 1 pH or more should be used.

  • Page 35: Automatic Calibration

    <4. Calibration pH/ORP> 4.1.2 Automatic Calibration Calibration can easily be performed by following the calibration menus. Sensor menu > Configure sensor > Cal.set pH > Buffers (select set) > Select Buffer At “Select Buffer”, select a buffer to use from among “NIST/DIN 19266”, “DIN 19267”, “US”, “Free programmable”.
  • Page 36 <4. Calibration pH/ORP> Table 4.1 Selection of Buffer Solution in 2-point calibration Buffer settings Buffer sequence selection menus NIST/DIN19266 pH1.7→pH4.0 pH1.7→pH6.9 pH4.0→pH6.9 pH1.7→pH9.2 pH4.0→pH9.2 pH6.9→pH9.2 pH4.0→pH1.7 pH6.9→pH1.7 pH6.9→pH4.0 pH9.2→pH1.7 pH9.2→pH4.0 pH9.2→pH6.9 DIN19267 pH4.7→pH6.8 pH4.7→pH9.2 pH6.8→pH9.2 pH6.8→pH4.7 pH9.2→pH4.7 pH9.2→pH6.8 pH4.0→pH7.0 pH4.0→pH10.0 pH7.0→pH10.0 pH7.0→pH4.0 pH10.0→pH7.0...

  • Page 37: Sample Cal

    <4. Calibration pH/ORP> Zero/slope1, 2 (3 pts) Calibration is performed in the sequence of the sequence selection menu (Table 5.1) of the solution that works with the “buffer solution” selected in calibration settings. Perform calibration by following the prompts on the screen. Limitations •...

  • Page 38: Cal. Set Orp/Rh

    <4. Calibration pH/ORP> Cal. set ORP/rH The calibration modes for ORP or rH are “Manual” and “Sample”. No automatic calibration feature is available in an ORP or rH calibration. Calibration is performed stepwise. Follow the prompts displayed on the screen. A stability check is made at each measurement point.
  • Page 39 Blank Page...

  • Page 40: Appendix 1 For Ph/Orp

    NOTE Yokogawa recommend the use of NIST (primary buffer standards) rather than buffers which have been adjusted by the addition of acid or alkaline materials to the buffer composition. In this way the customer gets a recognized standard, as well as the best buffer capacity (the ability to resist pH change with contamination).
  • Page 41 App.1-2 <Appendix 1 For pH/ORP> Matrix temperature compensation Table 5 shows the defaults for the matrix temperature compensation which are selectable in Temperature compensation (Section 4.2.3). Table 5 Defaults for the matrix temperature compensation (Reference temperature (Tref.): 25.0°C) Temp. range Solution 1 Solution 2 Solution 3...
  • Page 42 Be careful to touch the concentrated sulfuric acid. Figure 1 shows the ORP values of the checking solutions prepared with Yokogawa’s reagents. If the measured ORP value is in the tolerable range, the electrode of the ORP sensor is working normally.
  • Page 43 Blank Page...
  • Page 44 Revision Record Manual Title : Model FLXA402 4-Wire Converter Operation of pH/ORP Manual No. : IM 12A01F02-01EN Nov. 2018/1st Edition Newly published IM 12A01F02-01EN 1st Edition : Nov. 22, 2018-00...
  • Page 45 Blank Page Yokogawa Electric Corporation 2-9-32 Nakacho, Musashino-shi, Tokyo 180-8750, JAPAN http://www.yokogawa.com/...

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