YOKOGAWA SC450G User Manual
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YOKOGAWA SC450G User Manual

Conductivity converter
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User's
Manual
Model SC450G
Conductivity Converter
[Style: S2]
IM 12D08N05-01E
5th Edition

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  • Page 1 User’s Model SC450G Manual Conductivity Converter [Style: S2] IM 12D08N05-01E 5th Edition...

  • Page 2: Table Of Contents>

    NOTE Measurement setup This page may be referred to when  Measure Conductivity only reading pages where subsequent Configure sensor submenu screens are shown in the text.  Temperature settings Connection to the relevant submenu  Temp. Compensation screen is indicated by a dotted line with ...

  • Page 3: Preface

    WARNING Installation and wiring The SC450G converter should only be used with equipment that meets the relevant IEC, American or Canadian standards. Yokogawa accepts no responsibility for the misuse of this unit. CAUTION...

  • Page 4: Warranty And Service

    • If the product is not used in a manner specified in this manual, the safety of this product may be impaired. 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. • Use of the instrument in improper applications • Use of the instrument in an improper environment or improper utility program...
  • Page 5 <PREFACE> In the event of warranty claim, the defective goods should be sent (freight paid) to the service department of the relevant sales organization for repair or replacement (at Yokogawa discretion). The following information must be included in the letter accompanying the returned goods: • Part number, model code and serial number • Original purchase order and date • Length of time in service and a description of the process • Description of the fault, and the circumstances of failure • Process/environmental conditions that may be related to the failure of the device. • A statement whether warranty or non-warranty service is requested • Complete shipping and billing instructions for return of material, plus the name and phone number of a contact person who can be reached for further information.

  • Page 6: Safety Precautions

    • If this instrument is used in a manner not specified in this user’s manual, the protection provided by this instrument may be impaired. • If any protection or safety circuit is required for the system controlled by the product or for the product itself, prepare it separately. • Be sure to use the spare parts approved by Yokogawa Electric Corporation (hereafter simply referred to as YOKOGAWA) when replacing parts or consumables. • Modification of the product is strictly prohibited. • The following safety symbols are used on the product as well as in this manual. WARNING This symbol indicates that an operator must follow the instructions laid out in this manual in order to avoid the risks, for the human body, of injury, electric shock, or fatalities.
  • Page 7 • 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 find mistakes or omissions in the user’s manuals, please contact our sales representative or your local distributor. Drawing Conventions Some drawings may be partially emphasized, simplified, or omitted, for the convenience of description.

  • Page 8: Ce Marking Products

    <PREFACE> CE marking products Authorized Representative in EEA The Authorized Representative for this product in EEA is Yokogawa Europe B.V. (Euroweg 2, 3825 HD Amersfoort, The Netherlands). n Identification Tag This manual and the identification tag attached on packing box are essential parts of the product. Keep them together in a safe place for future reference. Users This product is designed to be used by a person with specialized knowledge.

  • Page 9: Table Of Contents

    TOC-1 <TABLE OF CONTENTS> Model SC450G Conductivity Converter [Style: S2] IM 12D08N05-01E 5th Edition CONTENTS PREFACE ....................i Safety Precautions ................. iv CE marking products ................vi 1. INTRODUCTION AND GENERAL DESCRIPTION .......1-1 Instrument check ................1-1 Application ..................1-2 2. GENERAL SPECIFICATIONS ............2-1 3.
  • Page 10 TOC-2 <TABLE OF CONTENTS> 3.6.4 Sensor cable connections using junction box (BA10) and extension cable (WF10) ....................3-13 4. OPERATION ..................4-1 Main display functions ..............4-1 Trending graphics ..............4-1 Zoom in on details ..............4-2 4.3.1 Actual mA1 ....................4-2 4.3.2 Actual mA2 ....................4-2 4.3.3 S1/S2/S3/S4 ....................4-2 4.3.4 C.C. (factory) ....................4-3 4.3.5 C.C. (adjusted) .....................4-3 4.3.6 Temp.
  • Page 11 APPENDICES .................. APP-1 Appendix 1 Temperature compensation ............APP-1 Appendix 2 TDS readings ................APP-5 Appendix 3 Calibration solutions for conductivity ...........APP-5 Appendix 4 Sensor selection for the SC450G ..........APP-7 Appendix 5 How to enter the cell constant for the SC21□G, SC8SG, and SC4AJ ...APP-9 Appendix 6 HART HHT (275/375) menu structure .........APP-9 Appendix 7 Control drawing for FM approval..........APP-13 Customer Maintenance Parts List ...... CMPL 12D08N05-02E Revision Record ..................
  • Page 12 Blank Page...

  • Page 13: 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 SC450G converter if these instructions are not followed.

  • Page 14: Application

    (see Chapter 5). While this initial configuration allows easy start-up, the configuration should be adjusted to suit each particular application. An example of an adjustable item is the type of temperature sensor used. The SC450G can be adjusted for a number of different types of temperature sensors. Details provided in this instruction manual are sufficient to operate the SC450G with all Yokogawa sensor systems and a wide range of third-party commercially available probes.

  • Page 15: General Specifications

    <2. GENERAL SPECIFICATIONS> 2. GENERAL SPECIFICATIONS Input specifications: Two or four electrodes measurement with square wave excitation, using max 60m (200 ft) cable (WU40/WF10) and cell constants from 0.005 to 50.0 cm Input ranges: Conductivity: 0.000 μS/cm to 2000 mS/cm Minimum: 1 μS/cm (underrange 0.00 μS x C) Maximum: 200 mS/cm (overrange 2000 mS x C) Resistivity: 0.0 Ω x cm to 1000 MΩ x cm Minimum: 5 Ω/cm (underrange 0.0 Ω/C) Maximum: 1 MΩ/cm (overrange 1000 MΩ/C) Note: “C” means cell constant. Temperature: Pt1000 -20 to 250ºC (0 to 500ºF) Pt100 -20 to 200ºC (0 to 400ºF) Ni100 -20 to 200ºC (0 to 400ºF) NTC 8k55 -10 to 120ºC (10 to 250ºF) Pb36 (JIS NTC 6k) -20 to 120ºC (0 to 250ºF) Accuracy: Conductivity/resistivity:...
  • Page 16 Approx. 1.5 kg Housing: Cast Aluminum housing with chemically resistant coating; Polycarbonate cover with Polycarbonate flexible window Protection IP66 / NEMA 4X / CSA Type 3S Colour; Silver grey SC450G-A(D)-A: IP66 cable glands are supplied with the unit SC450G-A(D)-U: N EMA 4X close up plugs are mounted in the unused cable entry holes and can be replaced by conduit fittings as required Pipe, Panel or Wall mounting using optional hardware Optional conduit adapter;...
  • Page 17 <2. GENERAL SPECIFICATIONS> Ratings; 100-240 V AC Acceptable range; 90 to 264 V AC Ratings; 50/60 Hz Acceptable range; 50 Hz ±5%, 60 Hz ±5% Power Consumption; 15 VA SC450G-D: Ratings; 12-24 V DC Acceptable range; 10.8 to 26.4 V DC Power Consumption; 10 W Safety, EMC and RoHS conforming standards Safety: EN 61010-1 EN 61010-2-030 EN 61010-2-201 CAN/CSA C22.2 No.61010-1 CAN/CSA C22.2 No.61010-2-030 CAN/CSA IEC 61010-2-201 UL 61010-1 UL 61010-2-030...
  • Page 18 <2. GENERAL SPECIFICATIONS> Model and Suffix Codes [Style: S2] Model Suffix code Option code Description SC450G ---------------- ----------------- Conductivity Converter Power ----------------- AC version (100…240 VAC) ----------------- DC version (12…24 VDC) Type ----------------- General purpose version ----------------- FM version (*3) Mounting Hardware Universal mounting kit (panel, pipe, wall) Pipe and wall mounting hardware (*2) Panel mounting hardware (*2) Hood Awning hood (stainless steel) (*2) Conduit adapter...

  • Page 19: Installation And Wiring

    3. INSTALLATION AND WIRING Installation and dimensions 3.1.1 Installation site The SC450G 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 60 metres (197 feet).
  • Page 20 <3. INSTALLATION AND WIRING> Unit: mm (inch)  Hood (Option code: /H5, some cutout on the left side cover) 184(7.2") 220(8.66") 144(5.67") 4x M6 screw 72(2.8") depth 7 (0.79") M20 cable gland  Adapter for Conduit Work (optional) (When shipped, not installed) (option code : / AFTG, / ANSI, / AM20) (0.79") A : For output signal...
  • Page 21 <3. INSTALLATION AND WIRING> Unit: mm (inch) min.185 (7.25") (5.43") 138(5.43") (5.43") Figure 3.2 Option /PM: panel mounting diagram Note: When option code “/UM” is specified, universal pipe/wall/panel mounting kit are supplied---same as option code “/U” and “/PM” both specified. wall mounting pipe mounting pipe mounting (vertical) (horizontal) (0.51") (3.15") 4x Ф6.5 (0.26") (3.15") (7.87") 4x Ф10 (0.4") (1.38") 154.5 (6.08")

  • Page 22: Wiring

    The enclosure is provided with stoppers instead of M20 cable glands for the unused holes. These stoppers must be removed and replaced by FM approved conduit fittings in accordance with good installation practice. Also see Appendix 7, Control drawing for FM approval. Figure 3.4 Internal view of SC450G wiring compartment Wiring 3.2.1 Preparation Refer to figure 3.4.

  • Page 23: Cables, Terminals, Glands And Conduit Adapter

    If it occurs, leave the touchscreen unpressed, turn off power then on again. The screen positioning will be accurate. 3.2.2 Cables, Terminals, glands and conduit adapter SC450G-A(D)-A The SC450G is supplied with terminals suitable for the connection of finished wires in the size range of 0.13 to 2.5 sq.mm. (26 to 14 AWG). The cable glands supplied will form a tight seal on cables with an outside diameter of 6 to 12 mm (0.24 to 0.47 inches). Unused cable entry holes must be sealed with cable glands including the close up plugs supplied.
  • Page 24 <3. INSTALLATION AND WIRING> High voltage section Contact Contact (S1, S2) (S3, S4) Input Power Sensor output cables output contact cable Cables cables cables Suitable for cables with an outside diameter between 6 - 12 mm (0.24 - 0.47”) Figure 3.5a Cable glands diagram Gland nut Contents: 6 X Gland M20...

  • Page 25: Wiring The Power Supply

    Wiring the power supply 3.3.1 General precautions NOTE Make sure the power supply is switched off. Also, make sure that the power supply is correct for the specifications of the SC450G and that the supply agrees with the voltage specified on the textplate. IM 12D08N05-01E...

  • Page 26: Access To Terminal And Cable Entry

    <3. INSTALLATION AND WIRING> WARNING • Install an external switch or circuit breaker to the power supply of the converter. • Use an external switch or circuit breaker rated 5A and conforming to IEC 60947-1 or IEC 60947-3. • It is recommended that the external switch or circuit breaker be installed in the same room as the converter. • The external switch or circuit breaker should be installed within reach of the operator and identified with marking as a power supply switch to the converter. • Power lines such as power cables and contact outputs should be fixed securely onto a wall or construction using cable racks, conduit tubing, nylon bands or other appropriate ways. Accidental removal from terminals by pulling may result in electric shock.

  • Page 27: Grounding The Housing

    Switching on the instrument After all connections are made and checked, the power can be switched on from the power supply. Make sure the LCD display comes on. 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. IM 12D08N05-01E...

  • Page 28: Wiring The Contact Signals

    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. 3.4.2 Contact outputs The SC450G unit’s four contacts (switches) that can be wired and configured to suit user requirements. Contact S4 is programmed as a fail-safe contact. Please refer to section 5.7, Contact output setup for functionality description. Alarm (limits monitoring) Contacts configured as “ALARM” can be energized when limits are crossed. Fail Contacts configured as “FAIL” will be energized when a fail situation occurs. Some...

  • Page 29: Contact Input

    Wiring the mA-output signals 3.5.1 General precautions The analog output signals of the SC450G transmit low power standard industry signals to peripherals like control systems or strip-chart recorders (Figure 3.6). 3.5.2 Analog output signals The output signals consist of active current signals of 4-20 mA. The maximum load can be 600 ohms on each. Should be used the cable beyond 30 V AC.

  • Page 30: Sensor Wiring

    3-12 <3. INSTALLATION AND WIRING> 3.6.2 Sensor wiring Refer to figure 3-9, which includes drawings that outline sensor wiring. The SC450G can be used with a wide range of sensor types. The sensor system fall into two categories, the ones that use fixed cables and the ones with separate cables. To connect sensors with fixed cables, simply match the terminal numbers in the instrument with the identification numbers on the cable ends. Figure 3.9 Sensor wiring diagrams 3.6.3 Other sensor systems To connect other sensor systems, follow the general pattern of the terminal connections as listed below: 11 and 12: Always used for temperature compensation resistor input.

  • Page 31: Sensor Cable Connections Using Junction Box (Ba10) And Extension Cable

    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 can be met.
  • Page 32 3-14 <3. INSTALLATION AND WIRING> 3 cm 9 cm heat shrink remove insulation Figure 3.11a 3 cm cotton threads Figure 3.11b Figure 3.11c IM 12D08N05-01E...

  • Page 33: Operation

    <4. OPERATION> 4. OPERATION Main display functions :EXAxt SC450 Go to trend screen 200.0 Go to zoom screen μS/cm Go to status screen 25.0 16.64 Go to maintenance screen Figure 4.1 Main Display A heart “ ” mark is lit on the right-upper corner of the screen when HART communication is active. An “Χ” mark is lit when HART communication is abnormal.

  • Page 34: Zoom In On Details

    <4. OPERATION> Zoom in on details This button gives access to the diagnostic information of the converter. The following messages will appear under normal (default) conditions: - Home key back to main screen. - One level up. - Scroll choices (grey means deactivated). Next - Enter selected data or choice. First zoom screen gives you inside into the parameters...

  • Page 35: Factory)

    <4. OPERATION> 4.3.4 C.C. (factory) The nominal cell constant as determined by the factory calibration during production. This value is set during commissioning, and is found on the nameplate of the sensor or the calibration certificate. Routing: Commissioning >> Measurement setup >> Configure sensor 4.3.5 C.C. (adjusted) The calibrated cell constant. When the cell constant of the system is adjusted on-line by grab sample or by calibrated solution technique, the new cell constant is recorded here.

  • Page 36: Hart Id

    The following files should be used when the HART Device revision level is 2. (0201.aot, 0201.fms, 0201.imp, 0201.sym) 4.3.16 Logbook The SC450G contains several logbooks to store history information on events, changed settings and calibrations. The logbooks have been categorized to simplify the retrieval of this information. Calibration will give information of previous calibrations. This logbook is useful as one now 1) Monitor the sensor performance over time.

  • Page 37: Information Function

    <4. OPERATION> Settings will give all history information on parameter settings concerning the analog outputs (mA1/mA2) and contact (S1…S4). This logbook is useful to trace back differences in performance due to changed settings. The events logged in this logbook are user definable. This is done in: Commissioning >> Configure Logbook >> Settings Logbook – mA and/or Settings Logbook – contact mA1/mA2 shows all (dynamic) events concerning the analog outputs S1/S2/S3/S4 shows all (dynamic) events concerning the contacts. Each HMI screen can contain up to 5 events. As the logbook can contain 50, one can access previous events by selecting events page 1 to 10.

  • Page 38: Navigation Of The Menu Structure

    <4. OPERATION> Navigation of the menu structure Main display Primary setup display Instrument in HOLD Commissioning menu display IM 12D08N05-01E...

  • Page 39: Menu Structure Commissioning

    <5. MENU STRUCTURE COMMISSIONING> 5. MENU STRUCTURE COMMISSIONING Measurement setup Main parameter Choose the required parameter, either conductivity or resistivity. If the main parameter is changed the instrument will reset main display settings, units and recalculate several values. The menu structure will change accordingly. 5.1 Configure sensor Sensor type Choose the sensor type used. Normally conductivity and/or resistivity measurements...

  • Page 40: Temperature Setting

    NaCl Temperature compensation according NaCl curve. See appendix 1 for values. Matrix The SC450G is equipped with a matrix type algorithm for accurate temperature compensation in various applications. Select the range as close as possible to the actual temperature/concentration range. The SC450G will compensate by interpolation. If user defined 1 or user defined 2 is selected, the temperature compensation range for the adjustable matrix must be defined.
  • Page 41 <5. MENU STRUCTURE COMMISSIONING> Conductivity only Resistivity only Conduct.+Concentr Concentration only Measurement setup  Measure Conductivity only Configure sensor  Temperature settings  Temp. Compensation  Calibration settings  Concentration Enter NOTE “Main parameter” and/or “Measure” determines the rest of the HMI menu structure Range Menu Parameter Default values min. max. Configure Sensor Cell constant 0.1 cm 0.005 cm...

  • Page 42: Calibration Settings

    <5. MENU STRUCTURE COMMISSIONING> Calibration settings Air adjust limit To avoid cable influences on the measurement, a “zero” calibration with a dry sensor may be done. If a connection box (BA10) and extension cable (WF10) are being used, “zero” calibration should be done including this connection equipment. When using a 4-electrode sensor additional connections are required. Temporarily Interconnect terminals 13 & 14 with each other and 15 & 16 with each other before making the adjustment.
  • Page 43 <5. MENU STRUCTURE COMMISSIONING> Measurement setup  Measure Conductivity only Configure sensor  Temperature settings  Temp. Compensation  Calibration settings  Concentration Enter Concentration measurement is only possible if “measure” in the “Configure sensor” menu is set to “conductivity + concentration” or “Concentration only”.

  • Page 44: Ma Output Setup

    <5. MENU STRUCTURE COMMISSIONING> mA output setup The general procedure is to first define the function (control, output, simulate, off) of the output and second the process parameter associated to the output. Available process parameters depend on selected “sensor type” and “measurement setup”. Off : W hen an output is set off the output is not used and will give an output of 4 Control : A selection of P- PI- or PID control Manual : Static output required to maintain reset equilibrium state with setpoint Direction : D irect. If the process variable is too high relative to the SP, the output of the controller is increased (direct action).
  • Page 45 <5. MENU STRUCTURE COMMISSIONING> mA2 similar structure to mA1 Range Menu Parameter Default values min. max. mA1 (control) Expire time 0.0 sec. 0 sec. 1800 sec. mA1 (output) Damping time 0.0 sec. 0 sec. 3600 sec. mA1 (simulate) Simulation perc. 100% PID-control mA1 Setpoint 250.0 μS/cm -inf +inf...
  • Page 46 <5. MENU STRUCTURE COMMISSIONING> Integral control Integral control is used to eliminate the steady state error and any future process changes. It will accumulate setpoint and process (load) changes by continuing to adjust the output until the error is eliminated. Small values of integral term (I-time in seconds) provide quick compensation, but increase overshoot. Usually, the integral term is set to a maximum value that provides a compromise between the three system characteristics of: overshoot, settling time, and the time necessary to cancel the effects of static loading (process changes). The integral term is provided with an anti windup function. When the output of PI portion of the controller is outside the control range (less than -5% or greater than 105%), the I-part is frozen.
  • Page 47 <5. MENU STRUCTURE COMMISSIONING> PI-control S1 Setpoint 250.0μS/cm 50.00μS/cm Range (proportional) Direction Reverse I-time 3600 s Enter Control Alarm Hold Fail Simulate S2, S3, S4 Similar structure to S1 Range Menu Parameter Default values min. max. PID-control S1 Setpoint 250.0 μS/cm -inf +inf Range...

  • Page 48: Contact Output Setup

    5-10 <5. MENU STRUCTURE COMMISSIONING> Contact output setup S1/S2/S3/S4 Each Switch (contact) can have the following functions. 1. Control: A selection of P- PI- or PID control 2. Alarm: Low or high value Limits monitoring 3. Hold: A hold contact is energised when the instrument is in HOLD 4. Fail: S4 is set as fail-safe contact. 6. Simulate: To test the operation of the contact, simulate can be used. The contact can be switched on or off or a percentage of duty cycle can be entered (DC period time) 6. Off: Switch is not used.
  • Page 49 5-11 <5. MENU STRUCTURE COMMISSIONING> S2, S3, S4 Similar structure to S1 Range Menu Parameter Default values min. max. Simulation Percentage 100% IM 12D08N05-01E...

  • Page 50: Fail

    5-12 <5. MENU STRUCTURE COMMISSIONING> % controller output t off > 0.1 sec Duty cycle t on t off Duty cycle t on > 0.1 sec Duty cycle Range Figure 5.4 Duty cycle control 0.3 s % controller output Maximum pulse frequency 0.3 s 50% pulse frequency No pulses...
  • Page 51 5-13 <5. MENU STRUCTURE COMMISSIONING> Errors 2/3 Temperature too high Warn Temperature too low Warn Polarization detect Warn Calibr. time exceeded USP limit exceeded Enter Errors 2/3 Temperature too high Warn Temperature too low Warn Polarization detect Warn Calibr. time exceeded USP limit exceeded Enter Range...

  • Page 52: Simulate

    5.10 Water for Injection Monitoring (USP 645 and EU 0169) Setting up SC450G for WFI monitoring A function “USP limit exceeded” is defined as an error code on sec. 5-12, Errors 2/3. This can be set to off/warn/fail according to your requirement. This function can be modified by the function “USP safety margin” in %. This is a percentage of the WFI conductivity value at that temperature that serves as safety margin. This is independent of what is being measured.
  • Page 53 5-15 <5. MENU STRUCTURE COMMISSIONING> Range Menu Parameter Default values High HART Network address IM 12D08N05-01E...

  • Page 54: Input Contacts

    0.2 s Expiry Time 0 (disabled) 5.11 Input contacts The terminal of the SC450G provides for an input contact (see Figure 3.7). This input contact can be used to switch the range of the outputs. The range can be increased by 1 decade. This is available for only mA1 output. 5.12 Error configuration Errors 1/3 ~ 3/3 Errors are intended to notify the user of any unwanted situations.
  • Page 55 5-17 <5. MENU STRUCTURE COMMISSIONING> Range Menu Parameter Default values High Y-axis Conduct low 0 μS/cm -inf +inf Conduct high 500 μS/cm -inf +inf Conduct 2 low 0 μS/cm -inf +inf Conduct 2 high 500 μS/cm -inf +inf Temp. low 0ºC, 32ºF -inf +inf Temp.

  • Page 56: Logbook Configuration

    Yokogawa Europe website. 5.14 Advanced setup Defaults The functionality of the SC450G allows to save and load defaults to come to a known instrument setting. The SC450G has both factory and user defined defaults. After a “load default” the instrument will reset. The following parameters are not included in the defaults 1. X-axis timing...

  • Page 57: Display Setup

    5-19 <5. MENU STRUCTURE COMMISSIONING> HART The address of the SC450G in a HART network can be set. Valid addresses are 0...15. Factory adjustment This menu is for service engineers only. This section is protected by a password. Attempting to change data in the factory adjustment menu without the proper instructions and equipment, can result in corruption of the instrument setup, and will impair the performance of the unit.
  • Page 58 Blank Page...

  • Page 59: Calibration

    In the commissioning menu, the original sensor configuration will include the programming of the cell constant defined for the sensor at manufacture. Follow the routing below to the setup screen : Commissioning >> Measurement setup >> Configure sensor The Calibration menu of the SC450G is provided for fine tuning the sensor setup, and checking and verification after a time in service. Where 1st and 2nd compensations are referred to in this part of the menu, these provide alternatives for the “wet” calibration, designed to give the user the greatest flexibility. This does not mean that two cell constants can or should be calibrated, they are alternative...

  • Page 60: Sample Calibration

    The laboratory data can then be entered regardless of the current process value, without the need for calculations. 6.5 Temperature coefficient calibration Simply input the solution conductivity at reference temperature (T ), after the sensor is allowed to stabilize at elevated temperature. The SC450G will calculate the temperature coefficient for you. The ideal temperature for this calibration, is the normal process value ). For good calibrations, the minimum span (T ) should be at least 2ºC. Note that the Temperature Compensation should be set to TC first.
  • Page 61 <6. CALIBRATION> • Polarization shows as a low side error at higher conductivity • A dirty sensor will often read perfectly at low conductivity • Wet calibration tests are best done towards the top of a sensor’s range • If the system responds correctly to the highest trip point, all is well IM 12D08N05-01E...
  • Page 62 Blank Page...

  • Page 63: Maintenance

    Battery The SC450G converter contains a logbook feature that uses a clock to provide the timings. The instrument contains a lithium cell (battery) to support the clock function when the power is switched off. The cell has an expected working life of 10 years. Should this cell need to be replaced, contact your nearest Yokogawa service center.

  • Page 64: Cleaning Methods

    LCD adjustment Contrast adjustment During the life of the analyzer the contrast of the display may fade. The contrast can be adjusted using the potentiometer on the backside of the LCD board. This adjustment must be done only by Yokogawa’s service personnel. The position is shown on the picture below. For units manufactured after July 2007, the potentiometer is placed behind the little hole in the LCD bracket as shown in Figure 3.4. For units manufactured between April 2006 and April 2007, the potentiometer is located as shown below.

  • Page 65: Troubleshooting

    Incorrect programming by the user will also result in an error, explained in a message, so that the fault can be corrected according to the limits set in the operating structure. The SC450G also checks the sensor system to establish whether it is still functioning properly.

  • Page 66: Predictive Maintenance

    Typical causes for this error are attempting to calibrate dirty sensors, calibration solution contamination and poor operator technique. Error displays and actions All errors are shown in the “Main Display” screen, however, the SC450G makes a distinction between diagnostic findings. The error messages may be set to OFF, WARN or FAIL. For process conditions where a particular diagnostic may not be appropriate, the setting OFF is used. FAIL gives a display indication only of that the system has a problem and inhibits the relay control action, and can be set to trigger the “Burn” function. “Burn-up...

  • Page 67: Appendices

    NaCl or standard temperature compensation From the factory the SC450G is set with the default of a general temperature compensation function based on a Sodium Chloride solution. This is suitable for many applications and is compatible with the NaCl compensation functions of typical laboratory or portable instruments.
  • Page 68 Calculate the temperature co-efficient of a liquid from the following data. Conductivity 124.5 µS/cm at a liquid temperature of 18.0 °C and a conductivity 147.6 µS/ cm at a liquid temperature of 31.0 °C. Substituting the data in the above formula gives the following result. 147.6 - 124.5 x 100= 1.298 %/C α = 124.5(31.0 - 25) - 147.6(18.0 - 25) Set the temperature coefficient in the SC450G converter. IM 12D08N05-01E...
  • Page 69 The compensation matrix is a table of temperature and conductivity values at differing concentrations. These values are used to calculate the temperature compensation applicable for a particular solution. Choose the component that you will be measuring in your application, and where appropriate the concentration range. SC450G will do the rest. By following the routing: Commissioning>> Measurement setup>> Temp.compensation>> Matrix you gain access to the Matrix selection area.
  • Page 70 . T h i s i s n e c e s s a r y a s otherwise the lookup function can give two results for one temperature. If an error is found, the SC450G will specify the location of the error as shown in the user interface screen “user defined 1/2”.

  • Page 71: Appendix 2 Tds Readings

    TDS reading ranges from 0.4 to 0.7 up to a conductivity of 500 µS/cm. At a conductance of approximately 3000 µS/cm the range would be from 0.5 and 1.0. The SC450G measures conductivity. This value can be used to display TDS values on the main display. One should use the additional concentration table. Please refer to section 5.5 for concentration measurement. The unit for the TDS reading can be set to ppm or ppb.
  • Page 72 Polarization is seen in contaminated sensors, and it is for this reason that there is a sophisticated polarization check built into the SC450G. Details of this diagnostic tool are found in the troubleshooting section (Chapter 8). SC450G is programmed with the following table of conductivity of Potassium Chloride (KCl) solutions at 25°C. This is used in the Automatic Cell Constant setting calibration feature. (See chapter 6 on calibration) The table is derived from the Standards laid down in “International Recommendation No. 56 of the Organisation Internationale de Métrologie...

  • Page 73: Appendix 4 Sensor Selection For The Sc450G

    For resistivity measurement the standard resistivity units of the calibration solution can be calculated as follows: R = 1000/G (kΩ•cm if G = μS/cm) Example: 0.001% weight R = 1000/21.4 = 46.7 kΩ•cm Appendix 4 Sensor selection for the SC450G Yokogawa supplies the following sensors, and their application is briefly described. All are compatible with the SC450G, and the user must be aware of the sensor configuration for 2 or 4 electrodes, in order to set the converter correctly. SC42-SP34 (&SX42-SX34) cc = 0.01 cm 2-electrode sensor This sensor is the first choice for pure and ultra pure water measurements. From 0.055µS/...
  • Page 74 APP-8 <APPENDIXES> SC4A-S(T)-XX-010..cc = 0.1 cm 2-electrode sensor This sensor is a good choice for clean water measurements. From 0.5µS/cm up to 200µS/ cm this is a good choice. The measuring range extends to 2000µS/cm, but there are better choices in that range. The “SC4A-” sensors make up a range that uses compression adapters or specialized fittings, including retractable. SC42-EP15(D) cc = 1 cm 2-electrode sensor This sensor is intended as a handy, short sensor. It is easy to fit in a branch (tee) on a pipeline, and is good for measurements where the precision is less critical than a convenient installation.

  • Page 75: Appendix 5 How To Enter The Cell Constant For The Sc21□G, Sc8Sg, And Sc4Aj

    APP-9 <APPENDIXES> Appendix 5 How to enter the cell constant for the SC21□G, SC8SG, and SC4AJ When install a new sensor, or replace a new one, put the cell constant manually as below. (1) In the case that the only cell constant is mentioned on the text plate of the sensor (SC211G, SC8SG, SC4AJ). Enter the cell constant directly. (2) In the case that the deviation of a nominal cell constant (± X.X%) is mentioned on the text plate of the sensor (SC210G). When the nominal cell constant is 5 cm and the deviation (CORR.% = -1.1) is mentioned: The cell constant to be entered is calculated as follows: 5 + 5 x (-1.1/100) = 4.945 Enter the cell constant of 4.945 cm...
  • Page 76 APP-10 <APPENDIXES> Online menu Level 1 menu Level 2 menu Level 3 menu Level 4 menu Zoom Zoom sensor Fact CC Adj CC Method SC1 Method SC2* Pol% Ohms USP% Zoom outputs mA1 value mA2 value S1 perc. S2 perc. S3 perc.
  • Page 77 APP-11 <APPENDIXES> Online menu Level 1 menu Level 2 menu Level 3 menu Level 4 menu Commissioning Measurement setup Meas Sensor type Configure Meas unit sensor Fact CC Measure* Temp settings Temp sensor Temp unit Temp Temp comp compensation Man value* Ref temp Method SC1 TC SC1*...
  • Page 78 Descriptor Message Poll addr Num resp preams Review Model Distributor Write protect Manufacturer Dev id Descriptor Message Date Universal rev Fld dev rev Sofware rev Poll addr Num req preams (*1): A part of the HART device ID (descriptor) (*2): Make sure to exit/cancel the loop test before proceeding to a measurement. NOTE HART protocol DD files can be downloaded by following URL. https://www.yokogawa.com/library/documents-downloads/software/ Go to the URL above and enter "SC450." IM 12D08N05-01E...

  • Page 79: Appendix 7 Control Drawing For Fm Approval

    APP-13 <APPENDIXES> Appendix 7 Control drawing for FM approval IM 12D08N05-01E...
  • Page 80 Blank Page...

  • Page 81: Parts List

    Customer Model SC450G Conductivity Converter Maintenance [Style: S2] Parts List 5a, 5b 6a, 6b 1a, 1b Item Part No. Description K9676GA Power board assembly AC version K9676HA Power board assembly DC version K9677EB Main board assembly SC version K9676MA LCD module...
  • Page 82 Pipe/Wall Mounting Hardware (Option code: /U) Panel Mounting Hardware (Option code: /PM) UNIVERSAL MOUNT SET (Option code : /UM) includes both “/U” and “/PM”. Awning Hood (Option code: /H5) Item Part No. Description K9171SS Mounting Set (/U) Y9608KU Screw D0117XL-A U-Bolt Assembly K9171SY Plate...

  • Page 83: Revision Record

    Revision Record Manual Title : Model SC450G Conductivity Converter [Style: S2] Manual Number : IM 12D08N05-01E Jul. 2017 Added RoHS, All reviewed. Mar. 2012 PREFACE, Addition of “How to dispose the batteries”; p1, Addition of KC mark; p4, Some revision of O) Safety and EMC conforming standards (description for EMC revised), addition of KC mark; p9, Caution mark position on Section 3-3-1 changed; p15, HART communication mark added to Figure 4-1; p28, Some revision of Section 5-10. Water for Injection Monitoring, (USP 645 and EU 0169). Setting up EXA SC450 for WFI monitoring; p36, Some revision of...
  • Page 84 Published by Yokogawa Electric Corporation 2-9-32 Nakacho, Musashino-shi, Tokyo 180-8750, JAPAN http://www.yokogawa.co.jp/an KOHOKU PUBLISHING & PRINTING INC. n Printed by IM 12D08N05-01E...

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