YOKOGAWA PH202G (S) User Manual
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YOKOGAWA PH202G (S) User Manual

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User's
Manual
YOKOGAWA
Model PH202G (S)
pH Transmitter
IM 12B6C3-E-E
12th Edition

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Summary of Contents for YOKOGAWA PH202G (S)

  • Page 1 User’s Model PH202G (S) pH Transmitter Manual IM 12B6C3-E-E YOKOGAWA 12th Edition...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS PREFACE 1. INTRODUCTION AND GENERAL DESCRIPTION ..............1-1 1-1. Instrument check ........................1-1 1-2. Application ..........................1-2 2. PH202 SPECIFICATIONS ......................2-1 2-1. Genera• ........................... 2-1 2-2. Operating specifications ......................2-2 2-3. Model and suffix codes ......................2-3 2-4.
  • Page 3 5-2. Commissioning mode ........................5-6 5-2-1. Output Range ........................5-7 5-2-2. Hold ..........................5-8 5-2-3. Service .......................... 5-10 5-3. Notes for guidance in the use of service coded settings ............. 5-11 5-3-1. Parameter specific functions ..................5-12 5-3-2. Temperature compensation and measuring functions ........... 5-14 5-3-3.

  • Page 4: 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: •...

  • Page 5: Introduction And General Description

    This user’s manual contains the information needed to install, set up, operate and maintain the unit correctly. 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 followed. 1-1. Instrument check...

  • Page 6: Application

    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 without compromise, to assure the user of continued accurate performance in even the most demanding industrial installations.

  • Page 7: Ph202 Specifications

    Specification 2-1 2. PH202 SPECIFICATIONS 2-1. General G. Serial communication A. Input specifications : Bi-directional HART® digital : Dual high impedance inputs communication superimposed (2 x 10 Ω) with provision on the 4-20 mA signal. for liquid earth connection. Suitable for inputs from glass H.

  • Page 8: Operating Specifications

    - Max. cable length : 1500 m the Handheld communicator - Detailed information can be found at: (HHC) and compatible www.hartcomm.org devices. For more information contact your local Yokogawa F. Housing : Cast aluminium case sales offices. with chemically resistant coating, cover with flexible polycarbonate window.

  • Page 9: Model And Suffix Codes

    Specification 2-3 O. Intrinsic safety N. Regulatory compliance - EMC : meets council directive 89/336/EEC - ATEX : EEx ib [ia] IIC T4 for Ta -10 to 55 ºC - Emmission : meets EN 55022 Class A EEx ib [ia] IIC T6 for Ta -10 to 40 ºC - Immunity : meets EN 61000-6-2 II 2 (1) G...
  • Page 10 2-4 Specification IM 12B6C3-E-E...
  • Page 11 Specification 2-5 IM 12B6C3-E-E...
  • Page 12 2-6 Specification IM 12B6C3-E-E...
  • Page 13 Specification 2-7 IM 12B6C3-E-E...
  • Page 14 2-8 Specification IM 12B6C3-E-E...
  • Page 15 Specification 2-9 IM 12B6C3-E-E...
  • Page 16 2-10 Specification IM 12B6C3-E-E...
  • Page 17 Specification 2-11 IM 12B6C3-E-E...
  • Page 18 2-12 Specification IM 12B6C3-E-E...
  • Page 19 Specification 2-13 IM 12B6C3-E-E...

  • Page 20: Installation And Wiring

    3-1 Installation and wiring 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 21 Installation and wiring 3-2 Wall mounting Pipe mounting Pipe mounting (vertical) (horizontal) (2.20) 2x ø6.5 (0.26) 4x ø10 (0.4) (3.6) (4.5) (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 12B6C3-E-E...

  • Page 22: Preparation

    3-3 Installation and wiring 3-2. Preparation Refer to figure 3-4. The power/output connections and the sensor connections should be made in accordance with the diagram on page 3-6. The terminals are of a plug in style for ease of mounting. To open the EXA 202 for wiring: 1.

  • Page 23: Wiring Of Sensors

    HOLD TEMP.MAN. F AIL MODE MEASURE AUT.CAL MAN.CAL YES NO DISPLA Y TEMP HOLD MODE > YOKOGAWA Computer Sensors Input Output/supply 2 , 5 or 10 m Distributor 1 0 0 1 8 0 Safety Barrier PH202S only Recorder pH/ORP temp.

  • Page 24: Liquid Earth

    In addition to that the sensor checking circuits also use the liquid earth for measurement of impedance of the sensors. All Yokogawa fittings have provisions for this connection. It is usually called liquid earth in all our manuals.

  • Page 25: Connection Of The Power Supply

    Installation and wiring 3-6 3-4-2. Connection of the power supply The terminal strip is accessed as was described in §3-2-1. Use the left-hand gland to insert the supply/ output cable to the transmitter. Connect the supply to the terminals marked +, - and G as is indicated in figures 3-8 and 3-9.

  • Page 26: Wiring The Sensor System

    3-7 Installation and wiring 3-5. Wiring the sensor system 3-5-1. 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 made before the jumpers are installed, because the cables will rest beside the jumpers in their installed positions.

  • Page 27: Sensor Wiring

    The EXA analyzers 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 28: Connection Cable

    3-9 Installation and wiring 3-6-1. 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) •...

  • Page 29: Sensor Cable Connection With Special Grommet

    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 30: Sensor Cable Connections Using Junction Box (Ba10) And Extension Cable (Wf10)

    Where a convenient installation is not possible using the standard cables between sensors and converter, a junction box and extension cable may be used. The Yokogawa BA10 junction box and the WF10 extension cable should be used. These items are manufactured to a very high standard and are necessary to ensure that the specifications of the system are not compromised.
  • Page 31 Installation and wiring 3-12 Extension cable may be purchased in bulk quantities, cut to length. Then it is necessary to terminate the cable as shown below. Termination procedure for WF10 cable. 1. Slide 3 cm of heat shrink tube (9 x 1.5) over the cable end to be terminated. 2.

  • Page 32: Operation; Display Functions And Setting

    4-1 Operation 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 user’s manual.

  • Page 33: Explanation Of Operating Keys

    TEMP WASH HOLD Commissioning MODE mode access key YOKOGAWA Figure 4-1. PH202 operator interface 4-2. Explanation of operating keys MODE key This key toggles between the measuring and maintenance modes. Press once to obtain access to the maintenance function menu.

  • Page 34: Setting Passcodes

    4-3 Operation 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 35: Display Functions

    FAIL TEMP.MAN. M E A S U R E A U T . C A L OUTPUT M A N . C A L SET HOLD D I S P L A Y SERVICE TEMP HOLD MODE YOKOGAWA IM 12B6C3-E-E...

  • Page 36: Display Functions Ph (Orp)

    4-5 Operation 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 TEMP. HOLD MODE "Logbook Scrolling" Logbook data is available only in instruments with "PIN" for advanced function AUT.CAL The display can give information DISPLAY...

  • Page 37: Display Functions Ph (Rh)

    Operation 4-6 4-5-3. Display functions pH (rH) 12B6B3-22 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 rH Display See Man Cal Chapter 6...

  • Page 38: Parameter Setting

    5-1 Parameter setting 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 window in the instrument cover.

  • Page 39: Manual Temperature Selection And Adjustment

    01. 5.1 Manual Temperature Selection & Adjustment. (pH Selected in Service Code 01) MODE FAIL Measure OUTPUT SET HOLD SERVICE MODE YOKOGAWA MODE AUT.CAL TEMP. TEMP.MAN. keys to adjust and enter manual temperature setting IM 12B6C3-E-E...

  • Page 40: Process Temperature Measuring In Orp Mode

    5-1-2. Process temperature measuring in ORP mode (ORP selected in Code 01) ORP selected in service code 01. MODE MEASURE OUTPUT SET HOLD SERVICE MODE YOKOGAWA MODE MAN.CAL TEMP. Display return to measuring mode with MEASURE temperature reading. IM 12B6C3-E-E...

  • Page 41: Manual Activation Of Hold

    5-1-3. Manual activation of HOLD MODE M E A S U R E OUTPUT SET HOLD SERVICE MODE YOKOGAWA MODE HOLD AUT.CAL HOLD MEASURE Note: The HOLD feature must first be activated in the commissioning mode section 5.2.2 IM 12B6C3-E-E...

  • Page 42: Manual Impedance Check

    Code 3 and 4. This enables the impedance data to be updated immediately after a maintenance event (e.g. replacing an electrode). MEASURE OUTPUT SET HOLD SERVICE MODE YOKOGAWA MODE AUT.CAL Return to measuring mode after updating impedance check IM 12B6C3-E-E...

  • Page 43: Commissioning Mode

    Parameter setting 5-6 5-2. Commissioning mode In order to obtain peak performance from the EXA, you must set it up for each custom application. Output range mA output is set as default to 0 - 14 pH. For enhanced resolution in more stable measuring processes, it may be desirable to select 5 - 10 pH range, for example.

  • Page 44: Output Range

    5-2-1. Output range MODE MEASURE AUT.CAL OUTPUT MAN.CAL SET HOLD DISPLAY SERVICE TEMP HOLD MODE YOKOGAWA Note: When rH or ORP is enabled in codes 02 and 31, the output range is set in a similar way to pH. IM 12B6C3-E-E...

  • Page 45: Hold

    Parameter setting 5-8 12B6C3-27 5-2-2. Hold Hold MODE MEASURE AUT.CAL OUTPUT MAN.CAL SET HOLD DISPLAY SERVICE TEMP HOLD MODE YOKOGAWA HOLD deactivated, return to commissioning menu. HOLD HOLD HOLD active last measured value. IM 12B6C3-E-E...
  • Page 46 5-9 Parameter setting HOLD value set, return to commissioning menu. HOLD HOLD HOLD HOLD Set HOLD "fixed value" for mA1. Set HOLD “fixed value” for mA Output IM 12B6C3-E-E...

  • Page 47: Service

    OUTPUT MAN.CAL SET HOLD DISPLAY SERVICE TEMP HOLD MODE Example: Service Code 01 YOKOGAWA Select main parameter for pH for ORP With the >, ,ENT keys Wait screen is displayed briefly before returning Wait screen is displayed to commissionning menu.

  • Page 48: 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 49 Parameter setting 5-12 Code Display Function Function detai• 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 50: Temperature Compensation And Measuring Functions

    5-13 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 connections used. The other options give the flexibility to use a very wide range of other pH sensors.
  • Page 51 Parameter setting 5-14 Code Display Function Function detai• Default values Temperature measuring and compensation functions *T.SENS Temperature sensor Pt1000 Pt1000 Pt100 3kBalco 8k55 PTC10k *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 52: Calibration Functions

    5-15 Parameter setting 5-3-3. Calibration functions Code 20 Δt.SEC & These functions are used to determine the stability level demanded by the EXA as acceptance criteria for the automatic calibration. The default settings give a good ΔpH 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 53 Parameter setting 5-16 Code Display Function Function detai• Default values Calibration functions *Δt.SEC Stability check time 5 sec. *ΔPH Stability check pH 0.02 pH *AS.LOW As Pot low limit -120 mV (As Pot) *AS.HI As Pot high limit 120 mV *ZR.LOW Zero Point low limit 5.00 pH...
  • Page 54 5-17 Parameter setting 5-3-4. mA output functions Code 31 OUTP.F When pH is set in code 1 as the main parameter, the output functions may be set as follows:- pH (table) Parameter 2 (ORP or rH as set in code 02) When ORP is set in code 1 as the main parameter, the output functions may be set to: ORP (table)

  • Page 55: Ma Output Functions

    Parameter setting 5-18 Code Display Function Function detai• Default values mA Outputs Not used *OUTP.F mA output functions Code 01 set for pH pH (table) Parameter 2 (with suitable sensor(s), and when enabled in code 02) *BURN Burn function No burnout No Burn.

  • Page 56: User Interface

    5-19 Parameter setting 5-3-5. 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 manual impedance check (on demand) can be setup for operation in the...
  • Page 57 Parameter setting 5-20 Code Display Function Function detai• Default values User interface *RET Auto return Auto return to measuring mode Off Auto return to measuring mode On *MODE Mode setup Manual impedance check Off Manual impedance check On *PASS Passcode Maintenance passcode Off 0.0.0 Off Note # = 0 - 9, where...

  • Page 58: Communication Setup

    The communication can be set to HART or to PH201 B distributor (for Japanese market only) *ADDR. For the Yokogawa PC202 software package, the default settings match the software as shipped. Code 61 *HOUR The clock/calendar for the logbook is set for current date and time as reference.
  • Page 59 Parameter setting 5-22 Code Display Function Function detai• Default values Communication *COMM. Communication Set communication Set communication write enable write write protect enable Set communication PH201 Without half time check With half time check *ADDR. Network address Set address 00 to 15 *HOUR Clock setup Adjust to current date and time using...
  • Page 60 5-23 Parameter setting 5-3-9. Notes for guidance in the use of service coded settings IM 12B6C3-E-E...

  • Page 61: 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 “commercial” or adjusted buffers. Yokogawa strongly recommends the use of these buffers to provide the best pH calibration.

  • Page 62: Calibration Procedures

    Press YES to start calibration. MEASURE AUT.CAL MAN.CAL DISPLAY TEMP HOLD MODE 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 63: Automatic Calibration With Hold Active

    MEASURE AUT.CAL MAN.CAL DISPLAY TEMP HOLD MODE HOLD 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 stabilise.

  • Page 64: Manual Calibration (2Nd Parameter Calibration)

    MEASURE AUT.CAL MAN.CAL DISPLAY TEMP HOLD MODE 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 65 Calibration 6-5 IM 12B6C3-E-E...

  • Page 66: Sample Calibration

    AUT.CAL MAN.CAL DISPLAY TEMP HOLD MODE YOKOGAWA Press YES at the same time as taking sample for analysis. PH 202 now continues to measure/control, as before. SAMPLE flashes to indicate that data is stored waiting for input of analyzed value.
  • Page 67 Calibration 6-7 When the laboratory analysis is completed the data is entered by first pressing MODE, then following the sequence below MODE MAN.CAL Return to maintenance menu MAN.CAL For first calibration of a new sensor MAN.CAL To calibrate ORP or rH Note: Display shows the value as at the time of taking the sample.
  • Page 68 IM 12B6C3-E-E...

  • Page 69: Maintenance

    (battery) 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 70 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 71: Troubleshooting

    Troubleshooting 8-1 8. TROUBLESHOOTING The EXA 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 also checks the electrodes to establish whether they are still functioning within specified limits.

  • Page 72: Diagnostics

    8-2 Troubleshooting 8-1. Diagnostics 8-1-1. Off-line calibration checks The EXA 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 poisoning or pollution of the reference system used.

  • Page 73: Error Codes

    Check cabling Sensor(s) defective Replace sensor(s) EEPROM write failure Fault in electronics Try again, if unsuccessful contact Yokogawa Wash recovery check error Measuring sensor aged Replace measuring sensor (if communication is set to pH201*B in code Sensor still coated after washing...

  • Page 74: Spare Parts

    9-1 Spareparts 9. SPARE PARTS Table 9-1. Itemized parts list Item No. Description Part no. Cover assembly including window, gasket and fixing screws K1542JZ Window K1542JN Internal works assembly (general purpose) K1544DA Internal works assembly (intrinsically safe) K1544DD Digital (display) board K1544DH Analog (input) board (general purpose) K1544PL...

  • Page 75: 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 off no TC *CAL.CK AP on, Slope on Temperature functions *T.SENS Pt1000...
  • Page 76 10-2 Appendix FUNCTION SETTING DEFAULTS USER SETTINGS User interface *RET *MODE *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 hard fail *Err.08 hard fail *Err.09 hard fail *Err.11 soft fail *Err.16 soft fail *CALL.M 250 days...

  • Page 77: Configuration Checklist For Ph202G

    Appendix 10-3 10-2. Configuration checklist for PH202G 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 “output” pH range linearized disabled 21 point table codes 31& 35 ORP range -500 to 500 mV spans up to 3000 mV between...

  • Page 78: Setup For Sensor Compatibility

    Service Codes found in Chapter 5 of this manual. • Most Yokogawa sensor systems use an Iso-thermal point (ITP) of pH7 and a zero point at pH7. This is the default condition for which the transmitter is set. It is only necessary to consider this adjustment when installing a system with a different ITP.

  • Page 79: Setup For Other Functions

    Appendix 10-5 10-4. Setup for other functions Current outputs • Transmission signals for the measured parameters and FAIL signals can be set up in service codes 30 to 39. Diagnostic Checks • Impedance checks, response time and stability checks are all included in the PH202. In order to get the best performance from each of these features, the converter should be fine tuned according to experience in the installation, and for the particular sensors selected.

  • Page 80: Set Up For Pfaudler Type 18 Sensor

    10-6 Appendix 10-5. Set up for Pfaudler Type 18 sensor The PH202 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 81: Device Description (Dd) Menu Structure

    10-6. Device Description (DD) menu structure The Device Description (DD) is available from Yokogawa or the HART foundation. An example is shown below of the ON LINE menu structure. This manual makes no attempt to explain the operation of the Hand Held Communicator (HHC).

  • Page 82: Field Change Order

    10-8 Appendix 10-7. Field Change Order Software changes of the PH202 10-7-1. Changes made by software release 1.1 - The hardware and software of the PH202 has been modified in order to make the instrument suitable for 8 temperature sensors. - Software version 1.0 supports only the PCB suitable for 5 temp sensors.
  • Page 83 Appendix 10-9 10-7-7. Changes made by software release 1.7 - Default * T.COEFF changed from 0.00 to -0.00. - Error 5.1 occurs (instead of 4.1) if no sensor is connected. - E12 can only occur if second process is ORP or rH. 10-7-8.

  • Page 84: Test Certificate

    11-1 Test Certificate 11. Test Certificate Test EXA Series Certificate Model PH202 Transmitter for pH / ORP Introduction This inspection procedure applies to the model PH202 converter. There is a serial number, unique to the instrument, which is stored in non-volatile memory. Each time the converter is powered up, the serial number is shown in the display.
  • Page 85 Test Certificate 11-2 Overall accuracy test This test can be performed by the end-user to check the overall accuracy of the instrument. The data specified on the Test certificate are results of the overall accuracy test performed during production and can be reproduced by performing similar tests with the following test equipment: 1.
  • Page 86 11-3 Test Certificate IM 12B6C3-E-E...
  • Page 87 Glossary GLOSSARY (-log [H This is a logarithmic function of the Hydrogen ion activity (concentration). This provides 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 88 Yokogawa has an extensive sales and YOKOGAWA HEADQUARTERS YOKOGAWA CORPORATION OF AMERICA 9-32, Nakacho 2-chome, 2 Dart Road distribution network. Musashinoshi Newnan GA 30265 Tokyo 180 United States Please refer to the European website Japan Tel. (1)-770-253-7000 Tel. (81)-422-52-5535 Fax (1)-770-251-2088 (www.yokogawa.com/eu) to contact your...

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