YOKOGAWA PH402G Instruction Manual
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YOKOGAWA PH402G Instruction Manual

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Instruction
Manual
YOKOGAWA
Model PH402G
pH Converter
IM 12B6B3-E-H
7th Edition

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Summary of Contents for YOKOGAWA PH402G

  • Page 1 Instruction Model PH402G pH Converter Manual IM 12B6B3-E-H YOKOGAWA 7th Edition...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS PREFACE 1. INTRODUCTION AND GENERAL DESCRIPTION ........1-1 1-1.
  • Page 4 10-2. Configuration checklist for PH402G ........

  • Page 5: Preface

    Do not use an abrasive or solvent in cleaning the instrument. Notice Contents of this manual are subject to change without notice. Yokogawa is not responsible for damage to the instrument, poor performance of the instrument or losses resulting from such, if the problems are caused by: Improper operation by the user.
  • Page 6 IM 12B6B3-E-H...

  • Page 7: Introduction And General Description

    This manual also includes a basic troubleshooting guide to answer typical user questions. Yokogawa can not be responsible for the performance of the EXA analyzer if these instructions are not fol- lowed. 1-1. Instrument Check Upon delivery, unpack the instrument carefully and inspect it to ensure that it was not damaged during ship- ment.

  • Page 8: Application

    For best results, read this manual in conjunction with the corresponding sensor instruction manual. Yokogawa designed and built the EXA to meet the CE regulatory standards. The unit meets or exceeds stringent requirements of EN 55082-2, EN55022 Class A and low voltage safety directive IEC1010 without compromise, to assure the user of continued accurate performance in even the most demanding industrial installations.

  • Page 9: Ph402 Specifications

    Specification 2-1 2. PH402 SPECIFICATIONS buffer tables, with automatic stability check. 2-1. General Manual adjustment to grab A. Input specifications sample. : Dual high impedance inputs Slope and Asymmetry Ω) with provision for (2 x 10 Potential setting. liquid earth connection. Zero point can be selected for Suitable for inputs from glass calibration and display instead...

  • Page 10: Operating Specifications

    Model Suffix Option Description for mA output. code -10 to +70 C (10 to 160 ºF) PH402G ........pH/ORP transmitter for LCD -E ........ Always E Supply -1......115 Volts 50/60 Hz voltage -2......230 Volts 50/60 Hz C. Storage temperature -4......

  • Page 11: Installation And Wiring

    Installation and wiring 3-1 3. INSTALLATION AND WIRING 3-1. Installation and dimensions 3-1-1. Installation site The EXA converter is weatherproof and can be installed inside or outside. It should, however, be installed as close as possible to the sensor to avoid long cable runs between sensor and converter. In any case, the cable length should not exceed 50 meters (162 feet).
  • Page 12 3-2 Installation and wiring wall mounting pipe mounting pipe mounting (vertical) (horizontal) (3.15) 2x ø6.5 (0.26) 4x ø10 (0.4) (5.70) (2.75) 2” ND. pipe OPTION/U: Universal pipe/wall mounting kit Figure 3-3. Wall and pipe mounting diagram Figure 3-4. Internal view of EXA wiring compartment IM 12B6B3-E-H...

  • Page 13: Preparation

    Installation and wiring 3-3 3-2. Preparation Refer to figure 3-4. The relay contact terminals and power supply connections are under the screening (shielding) plate. These should be connected first. Connect the sensor, outputs and data communication connections last. To open the EXA 402 for wiring: 1.

  • Page 14: Wiring The Power Supply

    3-4 Installation and wiring REAR GLANDS FRONT GLANDS Sensor Power Output 0/4-20 mA Contact signals output 0/4-20 mA S3/WASH Contact RS485 output S4/FAIL Contact input Figure 3-6. System configuration 3-3. Wiring the power supply 3-3-1. General precautions Make sure the power supply is switched off. Also, make sure that the power supply is correct for the speci- fications of the EXA and that the supply agrees with the voltage specified on the textplate.

  • Page 15: Ac Power

    After a brief interval, the display will change to the measured value. If errors are displayed or a valid measured value is not shown, consult the troubleshooting section (Chapter 8) before calling Yokogawa. Figure 3-8. Grounding the housing IM 12B6B3-E-H...

  • Page 16: Wiring The Contact Signals

    3-6 Installation and wiring 3-4. Wiring the contact signals 3-4-1. General precautions The contact output signals consist of voltage-free relay contacts for switching electrical appliances (SPDT). They can also be used as digital outputs to signal processing equipment (such as a controller or PLC). It is possible to use multi-core cables for the contact in and output signals and shielded multi-core cable for the analog signals.

  • Page 17: Wiring The Sensor System

    Installation and wiring 3-7 3-6. Wiring the sensor system 3-6-1. Impedance measurement jumper settings NOTE: It is important to decide first which application and which settings are appropriate for the installation. This decision is best done before the jumpers are installed, because the cables will rest on top of the jumpers in their installed positions.
  • Page 18 3-8 Installation wiring Default jumper connections for : - Input 1, High impedance - Input 2, Low impedance Service code 03 = 1.1.1 - Input 1, High impedance, Temp. comp., Check on Service code 04 = 0.0.1 - Input 2, Low impedance, Temp. comp. off, Check on Jumper connections for : - Input 1, High impedance - Input 2, High impedance...
  • Page 19 Installation and wiring 3-9 Jumper connections for : - Input 1, Low impedance - Input 2, High impedance Service code 03 = 0.0.1 - Input 1, Low impedance, Temp. comp. off, Check on Service code 04 = 1.1.1 - Input 2, High impedance, Temp. comp. on, Check on Jumper connections for : - Input 1, Low impedance - Input 2, Low impedance...

  • Page 20: Sensor Wiring

    The EXA PH402 can be used with a wide range of commercially available sensor types, both from Yokogawa and other manufacturers. The sensor systems from Yokogawa fall into two categories; the ones that use a fixed cable and the ones with separate cables.

  • Page 21: Connection Cable

    Installation and wiring 3-11 3-7-1. Connection cable There are two types of connection cable, one for single sensors and one for combined sensors. The former is a coaxial cable and has only two connections. to measuring element Blue to screen (shield) The latter is a triaxial cable with three connections, (it has an extra white wire termination) these wires are connected: to measuring element...

  • Page 22: Sensor Cable Connection With Special Grommet

    3-12 Installation and wiring Green Green 11 TEMPERATURE 11 TEMPERATURE BLUE BLUE 12 TEMPERATURE 12 TEMPERATURE Yellow BLUE 13 REFERENCE 13 REFERENCE BLACK BLACK 14 SOLUTION GROUND 14 SOLUTION GROUND Blue 15 GLASS (MEASURE) 15 GLASS (MEASURE) BLUE 16 SHIELD 16 SHIELD WHITE BLUE...

  • Page 23: Sensor Cable Connections Using Junction Box (Ba10) And Extension Cable (Wf10)

    8. Tighten the nut to form a firm seal. (Hand-tight is sufficient.) NOTE: The special gland is intended to be used to seal the multiple cables from the Yokogawa flow fittings such as FF20 and FP20. The designated cables are WU20 sensor cables, which are approximately 5 mm (0.2 “) in diameter, and 82895002 liquid earth cables, which are approximately 2.5 mm (0.1 “) in diameter.
  • Page 24 3-14 Installation and wiring Extension cable may be purchased in bulk quantities or in pre-finished lengths. In the case of bulk quantities cut to length, then it is necessary to terminate the cable as shown below. Termination procedure for WF10 cable. 1.

  • Page 25: Tag Plate Mounting

    Installation and wiring 3-15 Figure 3-14. Sensor cable connections with special grommet 3-8. Tag plate mounting When option /SCT is specified, a stainless steel tagplate is supplied with the designated Tag No. stamped or engraved. It is mounted as shown in figure 3-14 using one of the cable glands. IM 12B6B3-E-H...
  • Page 26 IM 12B6B3-E-H...

  • Page 27: Operation; Display Functions And Setting

    Operation 4-1 4. OPERATION; DISPLAY FUNCTIONS AND SETTING 4-1. Operator interface This section provides an overview of the operation of the EXA operator interface. The basic procedures for obtaining access to the three levels of operation are described briefly. For a step-by-step guide to data entry, refer to the relevant section of this instruction manual.

  • Page 28: Explanation Of Operating Keys

    MODE mode access key Selection keys WASH/S3 YES : Accept setting Relay contact : Change setting FAIL/S4 status indicators YOKOGAWA Adjustment keys > : Choose digit to Measure/Maintenance adjust mode key : Adjust digit Broken line indicates area ENT : Confirm change...

  • Page 29: Setting Passcodes

    Operation 4-3 4-3. Setting passcodes 4-3-1. Passcode protection In Service Code 52, EXA users can set passcode protection for each one of the three operating levels, or for any one or two of the three levels. This procedure should be completed after the initial commissioning (setup) of the instrument.

  • Page 30: Display Functions

    (as. pot. or zero point) DISPLAY HOLD TEMP.MAN. FAIL MODE MEASURE AUT.CAL SETPOINTS MAN.CAL RANGE Efficiency DISPLAY SET HOLD TEMPERATURE WASH (slope) HOLD SERVICE DISPLAY CONTACTS Press YES to fix MODE the selected second line of display WASH/S3 FAIL/S4 YOKOGAWA IM 12B6B3-E-H...

  • Page 31: Display Functions Ph (Orp)

    Operation 4-5 4-5-2. Display functions pH (ORP) Service Code 01 Set for pH. Service Code 02 Set for ORP on parameter 2. MEASURE AUT.CAL MAN.CAL DISPLAY DISPLAY TEMP. HOLD MODE "Logbook Scrolling" AUT.CAL The display can give information DISPLAY about calibrations performed with date and time.

  • Page 32: Display Functions Ph (Rh)

    4-6 Operation 4-5-3. Display functions pH (rH) Service Code 01 Set for pH. Service Code 02 Set to rH on parameter 2. MEASURE AUT.CAL Temp Display MAN.CAL DISPLAY DISPLAY TEMP. HOLD MODE See Auto Cal Chapter 6 AUT.CAL DISPLAY pH Display See Man Cal Chapter 6 Current...

  • Page 33: Parameter Setting

    Parameter setting 5-1 5. PARAMETER SETTING 5-1. Maintenance mode Standard operation of the EXA instrument involves use of the maintenance (or operating) mode to set up some of the parameters. Access to the maintenance mode is available via the six keys that can be pressed through the flexible win- dow in the instrument cover.

  • Page 34: Manual Temperature Selection And Adjustment

    5-2 Parameter setting 5-1-1. Manual temperature selection and adjustment pH selected in service code 01. MODE MEASURE SETPOINTS RANGE SET HOLD WASH SERVICE CONTACTS MODE WASH/S3 FAIL/S4 YOKOGAWA MODE AUT.CAL TEMP. TEMP.MAN. keys to adjust and enter manual temperature setting IM 12B6B3-E-H...

  • Page 35: Process Temperature Measuring In Orp Mode

    5-1-2. Process temperature measuring in ORP mode ORP selected in service code 01. MODE MEASURE SETPOINTS RANGE SET HOLD WASH SERVICE CONTACTS MODE WASH/S3 FAIL/S4 YOKOGAWA MODE MAN.CAL TEMP. Display return to measuring mode with MEASURE temperature reading. IM 12B6B3-E-H...

  • Page 36: Manual Activation Of Hold

    5-4 Parameter setting 5-1-3. Manual activation of HOLD MODE MEASURE SETPOINTS RANGE SET HOLD WASH SERVICE CONTACTS MODE WASH/S3 FAIL/S4 YOKOGAWA MODE HOLD AUT.CAL HOLD MEASURE Note: The HOLD feature must first be activated in the commissioning mode section 5-2-3. IM 12B6B3-E-H...

  • Page 37: Manual Wash Start/Stop

    SET HOLD WASH SERVICE CONTACTS MODE WASH/S3 FAIL/S4 YOKOGAWA MODE MODE AUT.CAL WASH ACTIVE press YES to stop. Note: Wash must first be switched on in commissioning mode section 5-2-4, and set for adjustment in the maintenance mode, by service code 51.

  • Page 38: Setpoint Adjustment

    Service Code. MEASURE SETPOINTS RANGE SET HOLD WASH SERVICE CONTACTS MODE WASH/3 FAIL/S4 YOKOGAWA MODE AUT.CAL For adjustments, follow procedures as in section 5-2-1. Setpoint 3 and 4 when enabled in service codes 42 and 43 Setpoint analogue...

  • Page 39: Manual Impedance Check

    This enables the impedance data to be updated immediately after a maintenance MEASURE event (e.g. replacing an electrode). SETPOINTS RANGE SET HOLD WASH SERVICE CONTACTS MODE WASH/3 FAIL/S4 YOKOGAWA MODE AUT.CAL Return to measuring mode after updating impedance check IM 12B6B3-E-H...

  • Page 40: Commissioning Mode

    5-8 Parameter setting 5-2. Commissioning mode In order to obtain peak performance from the EXA, you must set it up for each custom application. Setpoints Alarms are set by default S1 - high process alarm S2 - low process alarm S3 - WASH S4 - FAIL The setpoints are at arbitrary default value.

  • Page 41: Setpoints

    Parameter setting 5-9 5-2-1. Setpoints MODE MEASURE AUT.CAL SETPOINTS MAN.CAL RANGE DISPLAY SET HOLD TEMPERATURE WASH HOLD SERVICE repeated keystrokes IM 12B6B3-E-H...
  • Page 42 5-10 Parameter setting Process Alarms on S.3 and S.4 are only available when enabled in Service Codes 40-49 Analogue control setpoint is only available when enabled in Service Code 31 Adjust setpoint value using > ENT keys as shown for setpoint 1. Setpoint confirmed- return to commissioning menu.

  • Page 43: Range

    Parameter setting 5-11 5-2-2. Range Range MODE MEASURE AUT.CAL SETPOINTS MAN.CAL RANGE DISPLAY SET HOLD TEMPERATURE WASH HOLD SERVICE See facing page IM 12B6B3-E-H...
  • Page 44 5-12 Parameter setting Choose Range to adjust, then set begin scale (0%) and end scale (100%) of the mA output signal, using the >, ,and ENT keys. Selection of mA output (0-20 / 4-20 mA) is in Service Code 30. Note: Range 2 does not Note: Range 2 does not appear when P1 control...

  • Page 45: Hold

    Parameter setting 5-13 5-2-3. Hold MODE MEASURE AUT.CAL SETPOINTS MAN.CAL RANGE DISPLAY SET HOLD TEMPERATURE WASH HOLD SERVICE HOLD deactivated, return to commissioning menu. HOLD HOLD HOLD active last measured value. IM 12B6B3-E-H...
  • Page 46 5-14 Parameter setting HOLD values set, return to commissioning menu. HOLD HOLD HOLD HOLD Set HOLD "fixed value" HOLD for mA2. HOLD Set HOLD "fixed value" for mA1. IM 12B6B3-E-H...

  • Page 47: Wash

    Parameter setting 5-15 5-2-4. Wash MODE MEASURE (NOTE: The menu item "WASH" AUT.CAL SETPOINTS MAN.CAL RANGE will not appear unless selected in DISPLAY SET HOLD TEMPERATURE WASH Service Code 42) HOLD SERVICE Wash system timings are set with the >, , and ENT keys in the setpoint menu IM 12B6B3-E-H...

  • Page 48: Service

    5-16 Parameter setting 5-2-5. Service MODE MEASURE AUT.CAL SETPOINTS MAN.CAL RANGE SET HOLD DISPLAY TEMPERATURE WASH HOLD SERVICE Example: Service Code 01 Select main parameter for pH for ORP With the >, ,ENT keys IM 12B6B3-E-H...

  • Page 49: Notes For Guidance In The Use Of Service Coded Settings

    Parameter setting 5-17 5-3. Notes for guidance in the use of service coded settings IM 12B6B3-E-H...

  • Page 50: Parameter Specific Functions

    Note that in both cases a suitable sensor combination is needed to make this possible. The Yokogawa FU20 (4-in-1) sensor can be used for this purpose, or a combination of individual sensors. Contact your local Yokogawa sales office for advice regarding applications and sensor selection.
  • Page 51 Parameter setting 5-19 Code Display Function Function detail Default values Parameter specific functions *PH.ORP Select main parameter pH *PRM.2 Enable 2nd parameter Off *Z1.CHK Impedance check 1 1.1.1 High High Temp comp off Temp comp on Imp check off Imp check on *Z.L.xΩ...

  • Page 52: Temperature Compensation And Measuring Functions

    5-20 Parameter setting 5-3-2. Temperature compensation and measuring functions. Code 10 T.SENS Selection of the temperature compensation sensor. The default selection is the Pt1000 Ohm sensor, which gives excellent precision with the two wire connec- tions used. The other options give the flexibility to use a very wide range of other pH sensors.
  • Page 53 Parameter setting 5-21 Code Display Function Function detail Default values Temperature measuring and compensation functions *T.SENS Temperature sensor Pt1000 Pt1000 Pt100 3kBalco 8k55 10kPTC *T.UNIT Display in °C or °F °C °C °F *T.ADJ Calibrate temperature Adjust to allow for cable resistance None *T.COMP Set temp comp...

  • Page 54: Calibration Functions

    5-22 Parameter setting 5-3-3. Calibration Functions ∆t.SEC & Code 20 These functions are used to determine the stability level demanded by the EXA as ∆pH acceptance criteria for the automatic calibration. The default settings give a good calibration for general purpose electrode systems with a fast response. Where heavy duty electrodes are used, or when low temperatures are concerned, these values should be adjusted.
  • Page 55 Parameter setting 5-23 Code Display Function Function detail Default values Calibration functions *∆t.SEC Stability check time 5 sec. *∆PH Stability check pH 0.02 pH *AS.LOW As Pot low limit -120 mV *AS.HI As Pot high limit 120 mV *SL.LOW Slope low limit 70 % *SL.HI Slope high limit...

  • Page 56: Ma Output Functions

    5-24 Parameter setting 5-3-4. mA Output functions Code 30 *mA Select required output signal. 0-20 or 4-20mA to suit associated equipment (Recorders, controllers etc.). Code 31 OUTP.F Select the parameters to transmit on the two mA output signals mA1 & mA2.
  • Page 57 Parameter setting 5-25 Code Display Function Function detail Default Values mA Outputs output signal 0-20 mA on mA1 4-20 mA on mA1 mA1 4-20 0-20 mA on mA2 4-20 mA on mA2 mA2 4-20 The choices below appear when pH was selected in service code 01 *OUTP.F Output Parameter pH on mA1...

  • Page 58: Contact Outputs

    5-26 Parameter setting 5-3-5. Contact outputs Code 40 *S1 & *S2 Process relays can be set for a variety of alarm and control function. & 41 Digit "X" sets the type of trigger: Off means that the relay is not active Low setpoint means that the relay is triggered by a decreasing measurement.
  • Page 59 Parameter setting 5-27 Code Display Function Function detail Default values Contacts Relay 1 settings 2.0.0 Low setpoint High setpoint High Note: Main process “HOLD” active means pH or ORP Process alarm Alarm whichever is set in Proportional duty cycle control code #1 Proportional frequency control Temperature alarm...
  • Page 60 5-28 Parameter setting Code 44 *D.TIME The delay time sets the minimum relay switching time. This function can be adjusted to give a good alarm function in a noisy process, preventing the relay from "chattering" or repeatedly switching when the signal is close to the setpoint. *PH.HYS The hysteris is the value beyond the setpoint that the measured value must *mV.HYS...
  • Page 61 Parameter setting 5-29 Code Display Function Function detail Default values Contacts (continued) *D.TIME Delay time Minimum relay switching time 0.2 sec. *PH.HYS Hysteresis pH Minimum pH/ORP change for relay reset 0.1 pH *mV.HYS Hysteresis ORP after switching 10 mV *rH.HYS Hysteresis rH Minimum rH change for relay reset 0.2 rH...

  • Page 62: User Interface

    5-30 Parameter setting 5-3-6. User interface Code 50 *RET. When Auto return is enabled, the converter reverts to the measuring mode from anywhere in the configuration menus, when no button is pressed during the set time interval of 10 minutes. Code 51 *MODE The adjustment of the contact setpoints, the manual operation of the wash...
  • Page 63 Parameter setting 5-31 Code Display Function Function detail Default values User interface *RET Auto return Auto return to measuring mode Off Auto return to measuring mode On *MODE Mode setup Setpoints in maintenance mode Off 0.0.0 Off Setpoints in maintenance mode On Wash in maintenance mode Off Wash in maintenance mode On Manual impedance check Off...

  • Page 64: Communication Setup

    The settings should be adjusted to suit the communicating device connected to the RS485 port. *SET. *ADDR. For the Yokogawa PC402 software package, the default settings match the soft- ware as shipped. Code 61 *HOUR The clock/calendar for the logbook is set for current date and time as reference.
  • Page 65 Parameter setting 5-33 Code Display Function Function detail Default values Communication *COMM. Communication Set communication Set communication Communication write enable write Communication write protect protect *SET. Baud rate & parity Baud rate 1200 2400 4800 9600 9600 Parity Even *ADDR. Network address Set address 00 to 15 *HOUR...

  • Page 66: Test And Setup Mode

    5-34 Parameter setting 5-3-9. Test and setup mode Code 80 *TEST The test mode is used to confirm the instrument setup. It is based on the factory setup procedure and can be used to check the QIC (factory generated test certifi- cate).
  • Page 67 Parameter setting 5-35 Code Display Function Function detail Default values Test and setup mode *TEST Test and setup Built in test functions as detailed in QIS and Service Manual Code Display Function Function detail Default values Not used 90-99 NOTE: Do not enter codes higher than #80 without authority, as altering the factory setup data will impair the EXA’s performance.
  • Page 68 IM 12B6B3-E-H...

  • Page 69: Calibration

    Default settings for the buffer solutions are the standard NIST (formerly NBS) recognised solutions “4”, “7” and “9”. These are known as primary buffers. They have a much better buffer capacity than the “commer- cial” or adjusted buffers. Yokogawa strongly recommends the use of these buffers to provide the best pH calibration.

  • Page 70: Calibration Procedures

    MAN.CAL DISPLAY TEMPERATURE HOLD CONTACTS MODE WASH/S3 FAIL/S4 YOKOGAWA Note: To start calibration with another solution, press NO to cycle through the other options. "CAL 7" "CAL 4" "CAL 9" "CAL 7" The instruments waits for the reading to stabilize.

  • Page 71: Automatic Calibration With Hold Active

    DISPLAY TEMPERATURE HOLD CONTACTS MODE HOLD WASH/S3 FAIL/S4 YOKOGAWA Note: To start calibration with another solution, press NO to cycle through the other options. "CAL 7" "CAL 4" "CAL 9" "CAL 7" HOLD The instruments waits for the reading to stabilize.

  • Page 72: Manual Calibration (2Nd Parameter Calibration)

    DISPLAY TEMPERATURE HOLD CONTACTS MODE WASH/S3 FAIL/S4 YOKOGAWA Put sensors in buffer solution. Press YES. Set the value using the >, , ENT key. Select the flashing digit with the > key. Increase its value by pressing the key. When the correct value is displayed, press ENT to enter the change.
  • Page 73 Calibration 6-5 Manual Calibration of Manual Calibration of mV zero point according offset for ORP (2nd parameter). to IEC 746-2 Where both pH and ORP (or rH) are measured, the offset (Asymmetry potential) of the second parameter is calibrated as shown below. Adjust value Adjust value with >, , ENT Keys...

  • Page 74: Sample Calibration

    DISPLAY TEMPERATURE HOLD CONTACTS MODE WASH/S3 FAIL/S4 YOKOGAWA (Note: Press NO to start calibration of zero point when enabled in Service Mode). Press YES at the same time as taking sample for analysis. PH402 now continues to measure/control, as before. SAMPLE flashes to indicate that data is stored waiting for input of analyzed value.
  • Page 75 Calibration 6-7 MODE MAN.CAL Put sensors in buffer solution. Press YES. Note: Display now shows the same value as at the time of taking the sample. Set the value using the >, , ENT key. Select the flashing digit with the > key. Increase its value by pressing the key.
  • Page 76 IM 12B6B3-E-H...

  • Page 77: Maintenance

    The EXA instrument contains a lithium cell to support the clock function when the power is switched off. This cell needs to be replaced at 5 yearly intervals (or when discharged). Contact your nearest Yokogawa service centre for spare parts and instructions.
  • Page 78 Their stability will be much worse than for NIST solutions. NOTE: NIST (formerly NBS) buffers are available as consumable items from any Yokogawa sales office under the following part numbers: 6C232 4.01 pH at 25°C}...

  • Page 79: Troubleshooting

    Troubleshooting 8-1 8. TROUBLESHOOTING The EXA PH402 is a microprocessor-based analyzer that performs continuous self-diagnostics to verify that it is working correctly. Error messages resulting from faults in the microprocessor systems itself are few. Incorrect programming by the user can be corrected according to the limits set in the following text. In addition, the EXA PH402 also checks the electrodes to establish whether they are still functioning within specified limits.

  • Page 80: Diagnostics

    8-2 Troubleshooting 8-1. Diagnostics 8-1-1. Off-line calibration checks The EXA PH402 transmitter incorporates a diagnostic check of the asymmetry potential after a calibration has been completed. This is a valid check for both manual and automatic calibration routines. The actual value can be called up from the DISPLAY routine in the maintenance menu. A large value often indicates a poisoning or pollution of the reference system used.

  • Page 81: Spare Parts

    Pipe and wall mounting hardware K1542KW Panel mounting hardware K1541KR /SCT Stainless steel tag plate K1543ST * NOTE: Contact your nearest Yokogawa service centre for the procedure for changing items 2 and 5. (Re-initialisation of the instrument). Fig. 9-1. Exploded view IM 12B6B3-E-H...
  • Page 82 IM 12B6B3-E-H...

  • Page 83: Appendix

    Appendix 10-1 10. APPENDIX 10-1. User setting table FUNCTION SETTING DEFAULTS USER SETTINGS Parameter specific functions *PH.ORP *PRM2 *Z1.CHK 1.1.1 High range, TC on check on *Z2.CHK 0.0.1 Low range, TC off check on *CAL.CK AP on, Slope on Temperature functions *T.SENS Pt1000 *T.UNIT...
  • Page 84 10-2 Appendix FUNCTION SETTING DEFAULTS USER SETTINGS Contacts 2.0.0 1.0.0 4.0.0 4.0.0 *D.TIME sec. *PH.HYS *RANGE *PER *FREQ p/min *tI.CNT *EXPIR User interface *RET *MODE both off *PASS 0.0.0 all off *Err.4.1 hard fail *Err.5.1 hard fail *Err.4.2 hard fail *Err.5.2 hard fail *Err.07...

  • Page 85: Configuration Checklist For Ph402G

    Appendix 10-3 10-2. Configuration checklist for PH402G Standard Configuration Options Reference for change Measured Variable(s) primary inputs pH, ORP and Temp pH range 0-14 pH any span within -2-16 pH "range" pH range linearized disabled 21 point table codes 31& 35...

  • Page 86: Setup For Sensor Compatibility

    It is for this reason that Yokogawa recommends that the NIST 4, 7 and 9 standard buffers be used to calibrate solutions. The temperature responses of these are pre-programmed into Service codes 24, 25, and 26 in the EXA PH402.

  • Page 87: Setup For Other Functions

    Appendix 10-5 10-4. Setup for other functions Contact Outputs Alarms, trips, and proportional control are all possible with the relay outputs, and configuration is by Service codes 40-49. In addition, FAIL alarm and wash cycle controller are available. Current outputs Transmission signals for the measured parameters and control signals can be set up in service codes 30 to 39.

  • Page 88: Set Up For Pfaudler Type 18 Sensor

    10-6 Appendix 10-5. Set up for Pfaudler Type 18 sensor The PH402 is intended to measure with all sorts of pH sensors, including the Pfaudler Type 18 sensor. The Pfaudler design of dual membrane system uses two enamels of differing sensitivity. The first a pH sensitive membrane, and the second one that responds to Na + and K + and acts as a reference.

  • Page 89: Field Change Order

    Appendix 10-7 10-6. Field Change Order Software changes of the PH402 10-6-1. Changes made by software release 1.1 - In the PH402 the limits for the impedance measurement can be set-up in service-code 3 and 4. When the measured impedance value goes beyond these limits, an impedance to low/high error is generated and Set-up limit value is displayed.
  • Page 90 10-8 Appendix 10-6-5. Changes made by software release 1.5 In release 1.3 sometimes a spike on the current output occurs. The repetition rate is very low (each week once or twice) and irregular. In release 1.5 this problem is solved. REMARK: this new version is based on release 1.3 and therefore does not have the functionality of release 1.4.

  • Page 91: Glossary

    Glossary GLOSSARY (-log [H+] ) This is a logarithmic function of the Hydrogen ion activity (concentration). This pro- vides a quick indication of the acidic or alkaline behavior of a dilute solution. Normally measured on a scale of 0-14 pH where low numerical values are acidic (0 is approximately 1 Normal acid) and high numbers are alkaline (14 is approximately 1 Normal NaOH).

  • Page 92: Error Codes

    Check cabling Sensor(s) defective Replace sensor(s) EEPROM write failure Fault in electronics Try again, if unsuccessful contact Yokogawa Wash response time check failure. Measuring sensor aged Replace measuring sensor Half-value recovery time too long. Sensor still coated after washing Check cleaning system...
  • Page 93 IM 12B6B3-E-H...
  • Page 94 Vicolo D. Pantaleoni, 4 Vélizy Valley SINGAPORE 18-20 Rue Grange Dame Rose 20161 MILANO THE NETHERLANDS Yokogawa Engineering Asia Pte. Ltd. Tel. +39-02-66 24 11 Yokogawa Nederland B.V. 78140 VELIZY VILLACOUBLAY 11, Tampines Street 92 Hoofdveste 11 Tel. +33-1-39 26 10 00...

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