horiba LAQUA F-71G Instruction Manual
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horiba LAQUA F-71G Instruction Manual

Benchtop ph/water quality analyzer ph meter
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pH METER ( F-71G )

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  • Page 1 Instruction Manual pH METER ( F-71G )

  • Page 3: Preface

    ● Warranty and responsibility HORIBA Advanced Techno Co., Ltd. warrants that the Product shall be free from defects in material and workmanship and agrees to repair or replace free of charge, at option of HORIBA Advanced Techno Co., Ltd., any malfunctioned or damaged Product attributable to responsibility of HORIBA Advanced Techno Co., Ltd.
  • Page 4 Regulations ■ Regulations ● EU regulations ● Conformable standards This equipment conforms to the following standards: EMC: EN61326-1 Class B, Basic electromagnetic environment Safety: EN61010-1 RoHS: EN50581 9. Monitoring and control instruments Warning: This product is not intended for use in industrial environments. In an industrial environment, electromagnetic environmental effects may cause the incorrect performance of the product in which case the user may be required to take adequate measures.
  • Page 5 Regulations ● Authorised representative in EU HORIBA UK Limited 2 Dalston Gardens, Stanmore, Middx HA7 1BQ, UK Regulations ● FCC rules Any changes or modifications not expressly approved by the party responsible for compliance shall void the user's authority to operate the equipment.
  • Page 6 Regulations ● China regulation Meaning of Marking This marking is applied to electric and electronic products sold in the People's Republic of China. The figure at the center of the marking indicates the environmental protection use period in years. (It does not indicate a product guarantee period.) It guarantees that the product will not cause environment pollution nor serious influence on human body and property within the period of the indicated years which is counted from...
  • Page 7 Regulations Name and amount of hazardous substance used in a product Hazardous substance Hexa- Poly Poly Unit name Cad- valent bromo- Lead bromo- cury mium chrom- diphenyl (Pb) biphenyl (Hg) (Cd) ether (PBB) (Cr (VI)) (PBDE) Main unit Battery AC adapter Cable Stand Printer...

  • Page 8: For Your Safety

    For Your Safety ■ For Your Safety ● Hazard classification and warning symbols Warning messages are described in the following manner. Read the messages and follow the instructions carefully. ● Hazard classification This indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
  • Page 9 For Your Safety ● [FRA] Informations de sécurité Veillez à lire le présent manuel avant d’utiliser le produit de manière à garantir son utilisation correcte et sûre. De même, rangez le manuel dans un lieu sûr de manière à pouvoir vous y reporter lorsque cela est nécessaire.
  • Page 10 For Your Safety ● [SWE] Säkerhetsinformation Se till att du läser denna handbok innan du börjar använda produkten för en korrekt och säker användning av den. Spara sedan handboken på en säker och lättåtkomlig plats så att du kan konsultera den när så behövs.
  • Page 11 For Your Safety ● [POL] Informacje dotyczące bezpieczeństwa Przed przystąpieniem do użytkowania tego produktu należy dokładnie zapoznać się z niniejszą instrukcją, aby zapewniona była prawidłowa i bezpieczna eksploatacja produktu. Instrukcję przechowywać w bez- piecznym miejscu, aby w razie potrzeby była zawsze dostępna. Treść...
  • Page 12 For Your Safety ● [JPN] 安全情報 ご使用になる前に、本書を必ずお読みください。お読みになった後は 必要なときにすぐに取り出せるように大切に保管してください。 本書に記載されている内容は予告なく変更される場合があります。あ らかじめご了承ください。 ● 設置環境 本製品は、EN61326-1 で定義される工業環境で使用することを想定し た製品ではありません。 工業環境においては、電磁妨害の影響を受ける可能性があり、その場 合には使用者が適切な対策を講ずることが必要となることがありま す。 本製品は、 EN61010-1 で定義される以下の環境用に設計されています。 過電圧カテゴリー II ● 汚染度 2 ●...
  • Page 13 For Your Safety ● Safety precautions This section provides precautions to enable you to use the product safely and correctly and to prevent injury and damage. The terms of DANGER, WARNING, and CAUTION indicate the degree of imminency and hazardous situation. Read the precautions carefully as it contains important safety messages.
  • Page 14 For Your Safety CAUTION Do not use the cable of serial communication, USB, or AC adapter under wet or humid conditions. Otherwise, it may cause a fire, electric shock, or breakage.

  • Page 15: Product Handling Information

    Product Handling Information ■ Product Handling Information ● Operational precautions Only use the product including accessories for their intended ● purpose. Do not drop, crash, or give any physical impact on the instrument. ● Do not immerse the instrument into alcohol, organic solvent, strong ●...

  • Page 16: Manual Information

    Manual Information ■ Manual Information ● Description in this manual This interprets the necessary points for correct operation and notifies the important points for handling the product. This indicates the part where to refer for information. HINT! This indicates reference information. ●...

  • Page 17: Table Of Contents

    Contents ■ Preface ....................... I ■ Regulations ....................II ■ For Your Safety ..................VI ■ Product Handling Information ............. XIII ■ Manual Information ................XIV Chapter 1 About F-71G ................1 Chapter 2 Information of F-71G ..............2 2.1 Measurement items ................2 2.2 Packing list ....................
  • Page 18 Contents 3.5.3 Memory data printing ..............56 3.5.4 Calibration history display ............. 57 3.5.5 Calibration history printing ............58 3.5.6 pH check history display ............... 60 3.5.7 pH check data printing ..............61 Chapter 4 Maintenance and Troubleshooting ........62 4.1 pH (ORP) electrode maintenance ............

  • Page 19: Chapter 1 About F-71G

    Chapter 1 About F-71G The benchtop type pH METER F-71G is optimized for laboratory measurement, and allows you to measure pH and ORP. It provides a comfortable measurement environment with the design easy to wipe clean without roughness on the surface, and the free-standing electrode stand and the custom LCD for ease of measurement.

  • Page 20: Chapter 2 Information Of F-71G

    Chapter 2 Information of F-71G 2.1 Measurement items Chapter 2 Information of F-71G Measurement items ・pH ・ORP (mV) ・Temperature...

  • Page 21: Packing List

    Chapter 2 Information of F-71G 2.2 Packing list Packing list The F-71G’s package includes the following. Electrodes are required for the measurement in addition to this package. If you want to buy an electrode, contact our representatives in your region. Product Quantity Main unit...

  • Page 22: Names And Functions

    Chapter 2 Information of F-71G 2.3 Names and functions Names and functions 2.3.1 Names of each part Stand arm Display Stopper Stand base Operation key CH1 reference electrode CH1 measurement electrode CH1 temperature electrode Printer connector AC adapter connector...

  • Page 23: Identification Of Manufacturing Date

    Chapter 2 Information of F-71G 2.3 Names and functions Connector for USB communication with a personal computer 2.3.2 Identification of manufacturing date Manufacturing date can be identified from MFG No. described in the ID label on the backside of the instrument.

  • Page 24: Display

    Chapter 2 Information of F-71G 2.3 Names and functions 2.3.3 Display Electrode status icon Printer connecting icon Data memory icon Setting mode Error No., USB icon Data No., Date Temperature HOLD indicator Measuring composition Measurement Calibration unit date...

  • Page 25: Operation Key

    Chapter 2 Information of F-71G 2.3 Names and functions 2.3.4 Operation key This instrument employs capacitance switches. You cannot operate them with thick gloves. Operate them with bare hands or thin rubber gloves. Operation key Function CAL key Starts/stops calibration or enters the calibration mode.

  • Page 26: Measurement (Meas) Flow Chart

    Chapter 2 Information of F-71G 2.4 Measurement (MEAS) flow chart Measurement (MEAS) flow chart pH measurement MODE key ORP measurement ORP measurement (mV) (Relative mV) CAL key MODE key...

  • Page 27: Setting (Set) Flow Chart

    Chapter 2 Information of F-71G 2.5 Setting (SET) flow chart Setting (SET) flow chart Standard solution setting NIST, USA, CUST ▲▼ key Temperature compensation ATC, MTC function setting ▲▼ key Automatic data memory ON, OFF setting ▲▼ key pH calibration interval setting ON, OFF ▲▼...

  • Page 28: Data (Data) Flow Chart

    Chapter 2 Information of F-71G 2.6 Data (DATA) flow chart Data (DATA) flow chart Data memory ▲▼ key Data display ▲▼ key pH calibration data ▲▼ key pH check data ▲▼ key...

  • Page 29: Chapter 3 Basic Operation

    Chapter 3 Basic Operation 3.1 Preparation Chapter 3 Basic Operation Preparation 3.1.1 Assembling the electrode stand Attach the stand shaft to the stand base. Attach the stopper and the stand arm to the stand shaft. Stand shaft Stand arm Stopper Stand base...

  • Page 30: Electrode Connection

    Chapter 3 Basic Operation 3.1 Preparation 3.1.2 Electrode connection CH1 reference electrode CH1 measurement electrode CH1 temperature electrode ● Electrode connector Insert the groove of electrode plug by fitting it with the socket pin of the instrument. If the pin and groove are misaligned, do not insert the plug with force.

  • Page 31: Connecting The Power Source

    Chapter 3 Basic Operation 3.1 Preparation Put the connector cover on the connector. Just push the cover on the instrument. Do not screw in it. ● Temperature connector Insert the temperature connector into the jack socket on the instrument. CH1 temperature electrode If the temperature connector is unconnected or the connection is wrong, the MTC set temperature is displayed as the sample temperature.

  • Page 32: Connecting And Setting The Printer

    Chapter 3 Basic Operation 3.1 Preparation 3.1.4 Connecting and setting the printer ● Connecting the printer Insert the printer cable by fitting with the connector socket of the instrument. Printer connector The following printer is possible. Printer ・CITIZEN CBM-910-24RJ120 V: plain paper type (Parts No.: 3014030146) ・CITIZEN CBM-910-24RJ230 V: plain paper type (Parts No.: 3014030147)

  • Page 33: Connecting The Personal Computer

    Chapter 3 Basic Operation 3.1 Preparation ● Setting the printer Refer to the instruction manual of the printer for settings and operations of the printer. (1) Set the DIP switch No. 6 to ON and No. 7 to OFF, and then set printer paper and ink ribbon. Keep the LF key held down.

  • Page 34: Settings

    Chapter 3 Basic Operation 3.2 Settings Settings This section describes the procedures of the instrument condition settings for measurement, calibration, and maintenance. The settings apply when you press the MEAS key to return to the measurement screen. If you press the SET key during setting or after pressing the ENTER key, the settings are cancelled.
  • Page 35 Chapter 3 Basic Operation 3.2 Settings Press the key to change NIST, USA, and CUST, and press the ENTER key. NIST When using a standard solution of specification interior specification (NIST) Bottle mark US specification When using a standard solution of the (USA) USA specification Bottle mark...

  • Page 36: Temperature Compensation Function Setting

    Chapter 3 Basic Operation 3.2 Settings 3.2.2 Temperature compensation function setting You can perform temperature compensation for pH electrode outputs. Press the SET key on the measurement screen, and press the ▼ key to enter the temperature compensation function setting screen. Press the ENTER key to enter the temperature compensation function change screen.
  • Page 37 Chapter 3 Basic Operation 3.2 Settings In Automatic Temperature Compensation (ATC), the instrument detects the solution temperature. When the temperature sensor is connected, the current tempera- ture of the solutions is displayed automatically. If the sensor is not connected, the set value for MTC (default: 25°C) is displayed.

  • Page 38: Auto Data Memory Setting

    Chapter 3 Basic Operation 3.2 Settings 3.2.3 Auto data memory setting Data memory can be performed automatically at a regular interval. Press the SET key on the measurement screen, and press the ▲ or ▼ key to enter the auto data memory setting screen.

  • Page 39: Ph Calibration Interval Setting

    Chapter 3 Basic Operation 3.2 Settings 3.2.4 pH calibration interval setting This setting allows you to ensure calibration at a regular interval. When the set interval (days) elapses after the previous calibration, ERROR No.0008 (Calibration cycle error) is displayed. Press the SET key on the measurement screen, and press the ▲...
  • Page 40 Chapter 3 Basic Operation 3.2 Settings If you select ON, press the key to select a digit and press the ▲ or ▼ key to change the value, and then press the ENTER key. Setting range: 1 to 999 days...

  • Page 41: Sample Id Setting

    Chapter 3 Basic Operation 3.2 Settings 3.2.5 Sample ID setting If a sample ID is set here, it is recorded together with the measurement data at the data memory and it allows you to search data easily. Press the SET key on the measurement screen, and press the ▲...

  • Page 42: Auto Printer Setting

    Chapter 3 Basic Operation 3.2 Settings 3.2.6 Auto printer setting You can set automatic printout when a printer is connected. When this setting is ON, automatic printout is executed at the following occasions. ・Data memory is performed during measurement. ・Calibration or check is completed in the calibration mode.

  • Page 43: Maintenance

    Chapter 3 Basic Operation 3.2 Settings 3.2.7 Maintenance The functions on the maintenance screen help you to use the instrument in good conditions. ● LCD check You can check the LCD. Press the SET key on the measurement screen, and press the ▲ or ▼ key to enter the maintenance screen.
  • Page 44 Chapter 3 Basic Operation 3.2 Settings ● Printer test You can check the printer connection and printout operation. Press the SET key on the measurement screen, and press the ▲ or ▼ key to enter the maintenance screen. Press the ENTER key to enter the maintenance item selecting screen.
  • Page 45 Chapter 3 Basic Operation 3.2 Settings Press the ENTER key to return to the printer test screen. ● Auto power off setting You can set ON/OFF of the auto power off function. When this function is ON and no key operations are performed for the set period, the instrument is powered OFF automatically.
  • Page 46 Chapter 3 Basic Operation 3.2 Settings Press the ▲ or ▼ key to enter the auto power off setting screen. Press the ENTER key to enter the auto power off change screen. Press the key to change ON or OFF, and press the ENTER key.
  • Page 47 Chapter 3 Basic Operation 3.2 Settings ● Date setting Perform this operation when you use the instrument for the first time or replace the lithium batteries. Press the SET key on the measurement screen, and press the ▲ or ▼ key to enter the maintenance screen.
  • Page 48 Chapter 3 Basic Operation 3.2 Settings Press the key to select a digit and press the ▲ or ▼ key to change the value for month and day setting, and then press the ENTER key. Press the key to select a digit and press the ▲...
  • Page 49 Chapter 3 Basic Operation 3.2 Settings Press the ENTER key to enter the maintenance item selecting screen. Press the ▲ or ▼ key to enter the memory data clear screen. Press the ENTER key to enter the memory data clear (Yes/No) screen. Press the key to select Yes, and press ENTER key to delete the memory data.
  • Page 50 Chapter 3 Basic Operation 3.2 Settings ● Calibration data clearing You can delete the calibration data of pH to initialize this. Note that this operation is irreversible. Press the SET key on the measurement screen, and press the ▲ or ▼ key to enter the maintenance screen.
  • Page 51 Chapter 3 Basic Operation 3.2 Settings Press the ENTER key to enter the measurement item screen. Press the ENTER key to enter the calibration data deleting (Yes/No) screen. (*Case of pH) Press the key to select Yes, and press ENTER key to delete the calibration data. When the deletion is completed, "End"...
  • Page 52 Chapter 3 Basic Operation 3.2 Settings ● Number of memory data display The number of memory data saved in the instrument is displayed. You can store up to 999 data. Press the SET key on the measurement screen, and press the ▲ or ▼ key to enter the maintenance screen.
  • Page 53 Chapter 3 Basic Operation 3.2 Settings Press the ENTER key to return to the number of memory data display screen. ● Temperature calibration You can perform calibration of the temperature sensor of an electrode. Press the SET key on the measurement screen, and press the ▲...
  • Page 54 Chapter 3 Basic Operation 3.2 Settings Press the key to select a digit and press the ▲ or ▼ key to change the value, and then press the ENTER key to return to the temperature calibra- tion screen. ● Setting initialization The settings are initialized.
  • Page 55 Chapter 3 Basic Operation 3.2 Settings ▲ or ▼ Press the key to enter the initializing set- tings screen. Press the ENTER key to enter the initializing set- tings (Yes/No) screen. Press the key to select Yes, and press ENTER key to initialize the settings. The initializing is complete when "End"...
  • Page 56 Chapter 3 Basic Operation 3.2 Settings ● Password setting This function prevents an unauthorized person from tam- pering the date of measurement data, or operating acci- dentally to change settings, delete memory data, etc. Press the SET key on the measurement screen, and press the ▲...
  • Page 57 Chapter 3 Basic Operation 3.2 Settings Press the key to change ON or OFF, and press the ENTER key. If you select ON, press the key to select a digit and press the ▲ or ▼ key to change the value, and then press the ENTER key and press the ENTER key to return to the password change screen.

  • Page 58: Calibration

    Chapter 3 Basic Operation 3.3 Calibration Calibration 3.3.1 pH calibration Up to 5 points of pH calibration is possible. ● Repeatability check of calibration After calibration is completed, immerse the electrode in the standard solution of pH7 and press the ENTER key to perform the repeatability check of calibration.
  • Page 59 Chapter 3 Basic Operation 3.3 Calibration Press the CAL key to enter the NIST calibration screen. Wait for the instantaneous value to be stable and press the CAL key. The HOLD indicator blinks until the reading stabilizes. When the reading stabilizes, the HOLD indicator lights up and the reading is held.
  • Page 60 Chapter 3 Basic Operation 3.3 Calibration Wash the pH electrode with pure water (deionized), and wipe it off by filter paper or tissue paper. Immerse the pH electrode in the standard solution of pH4 to calibrate the second point. Press the CAL key to display the instantaneous value.
  • Page 61 Chapter 3 Basic Operation 3.3 Calibration Electrode status You can check the electrode status after calibration. Display Description Good condition. ,ERR Electrode sensitivity: 93% to 100% No display Electrode sensitivity: 90% to 93% ・Check that the standard solutions are correct. Blinks ・Wash the electrode.
  • Page 62 Chapter 3 Basic Operation 3.3 Calibration Open the filler port of the internal solution. During the calibration, the filler port should be kept open. Immerse the pH electrode in the standard solution of pH7 to calibrate the first point. Press the CAL key to enter the USA calibration screen.
  • Page 63 Chapter 3 Basic Operation 3.3 Calibration Press the CAL key to display the instantaneous value. Wait for the instantaneous value to be stable and press the CAL key. The HOLD indicator blinks until the reading stabilizes. When the reading stabilizes, the HOLD indicator lights up and the reading is held.
  • Page 64 Chapter 3 Basic Operation 3.3 Calibration Electrode status You can check the electrode status after calibration. Display Description Good condition. ,ERR Electrode sensitivity: 93% to 100% No display Electrode sensitivity: 90% to 93% ・Check that the standard solutions are Blinks correct.
  • Page 65 Chapter 3 Basic Operation 3.3 Calibration Press the CAL key to enter the CUST calibration screen. Press the key to select digit and press the ▲ or ▼ key to change value, to set the value of the desired standard solution. Check the stable indication value, and press the CAL key.
  • Page 66 Chapter 3 Basic Operation 3.3 Calibration Press the CAL key to display the instantaneous value. Wait for the instantaneous value to be stable and press the CAL key. The HOLD indicator blinks until the reading stabilizes. When the reading stabilizes, the HOLD indicator lights up and the reading is held.

  • Page 67: Calibration Value Printing

    Chapter 3 Basic Operation 3.3 Calibration 3.3.2 Calibration value printing You can print out the data during calibration HOLD or calibration error. Check the printer settings and that the printer is connected correctly. (Refer to "3.1.4 Connecting and setting the printer" P.14.) Press the DATA key during calibration HOLD or calibration error.

  • Page 68: Measurement

    Chapter 3 Basic Operation 3.4 Measurement Measurement 3.4.1 Measurement value hold The instrument can hold the measurement value automatically when it judges that the value is stable. Press the MEAS key when the instantaneous value is displayed in the instantaneous measurement, and the HOLD indicator blinks.

  • Page 69: Measurement Items Changing

    Chapter 3 Basic Operation 3.4 Measurement 3.4.2 Measurement items changing When the MODE key is pressed, measurement item can be changed in the channel where ACT is lit. pH measurement MODE key ORP measurement ORP measurement (mV) (Relative mV) CAL key MODE key 3.4.3 Auto data memory The instrument can perform data memory automatically...

  • Page 70: Measurement Value Printing

    Chapter 3 Basic Operation 3.4 Measurement To stop the auto data memory, press the ENTER key. ・ Do not power ON/OFF while the auto data memory function works. It may damage the reliability of the memory data. ・ Only the POWER, ENTER, and the ▲ or ▼ keys are possible while the auto data memory function works.
  • Page 71 Chapter 3 Basic Operation 3.4 Measurement ● pH measurement mode HOLD condition ① At HOLD: AUTO Instant value: INST ① Temperature ② ② compensation setting ③ At Manual mode: MTC ④ ⑤ At Auto mode: ATC Sample ID ③ ⑥ ⑦...

  • Page 72: Data Operation

    Chapter 3 Basic Operation 3.5 Data operation Data operation 3.5.1 Data memory of measurement value Measurement data can be stored into the instrument memory. Refer to "3.4.3 Auto data memory" P.51 for automatic data memory. Press the DATA key to enter the data operation screen.

  • Page 73: Memory Data Display

    Chapter 3 Basic Operation 3.5 Data operation 3.5.2 Memory data display The memory data can be displayed on the screen. Press the DATA key to enter the data operation mode. Press the ▲ or ▼ key to enter the memory data dis- play screen.

  • Page 74: Memory Data Printing

    Chapter 3 Basic Operation 3.5 Data operation 3.5.3 Memory data printing The memory data can be printed out. Display the memory data referring to "3.5.2 Memory data display" P.55. Press the ENTER key. The displayed measurement data is printed out. ●...

  • Page 75: Calibration History Display

    Chapter 3 Basic Operation 3.5 Data operation 3.5.4 Calibration history display ● pH calibration history display Press the DATA key to enter the data operation screen. Press the ▲ or ▼ key to enter the calibration history display screen. Press the ENTER key. The asymmetry potential of the latest calibration data is displayed.

  • Page 76: Calibration History Printing

    Chapter 3 Basic Operation 3.5 Data operation When the electrode sensitivity is 90% to 93%, "Check" is dis- played instead of "Good". When the sensitivity is 85% to 90%, "bAd" is displayed. Refer to " Electrode status" P.43. 3.5.5 Calibration history printing The calibration history can be printed out for each measurement item.
  • Page 77 Chapter 3 Basic Operation 3.5 Data operation ● pH calibration history (with check data) ① Instrument model ① ② Serial number ② ③ ④ Electrode status ③ Asymmetry potential ④ Sensitivity ⑤ ⑤ Check value of repeatability ⑥ Calibration data ⑦...

  • Page 78: Ph Check History Display

    Chapter 3 Basic Operation 3.5 Data operation 3.5.6 pH check history display The pH check history can be printed out. ● Repeatability check of calibration After calibration is completed, immerse the electrode in the standard solution of pH7 and press the ENTER key to perform the repeatability check of calibration.

  • Page 79: Ph Check Data Printing

    Chapter 3 Basic Operation 3.5 Data operation 3.5.7 pH check data printing The pH check history can be printed out. Check that the printer settings and that the is con- nection are correctly. (Refer to "3.1.4 Connecting and setting the printer" P.14.) Display the memory data referring to "3.5.6 pH check history display"...

  • Page 80: Chapter 4 Maintenance And Troubleshooting

    Chapter 4 Maintenance and Troubleshooting 4.1 pH (ORP) electrode maintenance Chapter 4 Maintenance and Troubleshooting This chapter explains the daily maintenance operations and error messages. Daily maintenance is vital in assuring accurate measurement and preventing breakage from occurring. If electrode maintenance is neglected, it may cause various problems and erroneous measurements.
  • Page 81 Chapter 4 Maintenance and Troubleshooting 4.1 pH (ORP) electrode maintenance ● Maintenance after daily use After making measurements, wash the electrode using pure water (deionized water), wipe off water from the electrode with filter or tissue paper, and store it with its cap placed on.
  • Page 82 Chapter 4 Maintenance and Troubleshooting 4.1 pH (ORP) electrode maintenance Fill the electrode with new internal solution (model 300), until it nears the filler port. Up to here Wash the tip of the electrode well with pure water (deionized) and wipe it with filter or tissue paper. If the inside of the protective cap is dry, wash the inside with pure water (deionized).
  • Page 83 Chapter 4 Maintenance and Troubleshooting 4.1 pH (ORP) electrode maintenance ● Washing electrodes If the tip of the pH electrode is extremely dirty, response speed may become slow and it may cause errors in measurement value. If the electrode is so dirty that it cannot be cleaned by rinsing with pure water (deionized), wash the electrode using the methods below depending on the dirt.

  • Page 84: Troubleshooting

    Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting Troubleshooting This instrument is equipped with a simple error-message function to notify the operator that an operation error or problem with the equipment has occurred. Errors or other problems that occur in the measurement mode are announced by an "ERROR No."...
  • Page 85 Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting ● ERROR No.0001 Memory error Definition Data cannot be read from or written to the internal memory. Cause Countermeasure The instrument Disconnect and reconnect the AC does not start adapter, and press the ON/OFF key 10 properly due to seconds later.
  • Page 86 Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting Cause Countermeasure The temperature of Measure after the sample solution tem- the sample solution perature stabilizes. is fluctuating. ● ERROR No.0004 Zero calibration error Definition The asymmetry potential of the electrode is outside the range of ±45 mV.
  • Page 87 Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting ● ERROR No.0005 Span calibration error (pH) Definition The electrode sensitivity is not within the range from 85% to 105% for the theoretical sensitivity. Cause Countermeasure The electrode is Wash the electrode. dirty. The electrode is Replace the electrode.
  • Page 88 Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting ● ERROR No.0007 Buffer uncertain Definition The standard solution cannot be identified automatically. After performing the countermeasures below, perform calibration again from the beginning. Cause Countermeasure There is a problem Prepare new standard solution. with the standard solution.
  • Page 89 Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting ● ERROR No.0009 Printer communication error Definition There is a problem with the printer communication. Power OFF the instrument and perform the countermeasures below, and then power ON again. Cause Countermeasure There is a problem Check the printer connection, and con- with the printer unit nect the instrument and printer again.

  • Page 90: More Troubleshooting

    Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting 4.2.2 More troubleshooting This section describes the countermeasures for the troubles that are not indicated by ERROR messages. ● The indicated value fluctuates When there is a problem with the electrode. Cause Countermeasure The responsive Wash the responsive membrane.
  • Page 91 Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting When there is a problem in the sample. Cause Countermeasure The liquid junction Immerse the electrode in the sample solu- is not immersed in tion up until the liquid junction. the sample solu- tion.
  • Page 92 Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting ● The indicated value does not change/No response. Cause Countermeasure Key operation is Disconnect and reconnect the AC invalid. adapter, and press the ON/OFF key 10 seconds later. If the same error occurs again, seek repairs at contact our representatives in your region.
  • Page 93 Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting ● The measured value is blinks. ・The pH value is outside the measurement range (when pH value is displayed). Measurement range: pH0.000 to pH14.000 ・The mV value is outside the display range (when mV value is displayed). Display range: ±1999.9 mV Cause Countermeasure...
  • Page 94 Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting ● The temperature display blinks. The temperature display is fixed at 25°C. The temperature measurement value is outside the measurement range. Measurement range: −30°C to 130°C Cause Countermeasure The temperature of Check the sample temperature. the sample is out- Adjust it within the measurement range.
  • Page 95 Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting ● Measurements are not repeatable. Cause Countermeasure The effects of the The pH or other properties of the sample sample. solution may have changed over time, making poor repeatability. The responsive Wash the responsive membrane. membrane is dry or dirty.

  • Page 96: Chapter 5 Specifications

    Chapter 5 Specifications 5.1 Specifications Chapter 5 Specifications Specifications ● Model information Item Description Brand (pet name) LAQUA Series name Benchtop pH/Water Quality Analyzer Model F-71G Model description pH METER ● Measuring object Measuring Item Description object Measuring principle Glass electrode Display range pH−2.000 to pH19.999 Measuring range...

  • Page 97: Default Settings

    Chapter 5 Specifications 5.2 Default settings ● Functions ・PC USB interface ・Memory number: Up to 999 ・Calibration points: Up to 5 points ・Password setting ・Printer connection Default settings Item Description Default value Temperature Automatic temperature compensation compensation (ATC) Manual temperature 25°C compensation value Auto power off...

  • Page 98: Options

    Chapter 5 Specifications 5.3 Options Options This section lists spare and optional parts for the instru- ment. These parts are possible through our representatives in your region. Place an order specifying their names, and part numbers. Part name Part number Remarks 3200647413 With 6 plug adapters AC adapter...
  • Page 99 31, Miyanonishi-cho, Kisshoin Minami-ku, Kyoto 601-8306, Japan http://www.horiba-adt.jp For any questions regarding this product, please contact your local agency, or inquire from the following website. http://global.horiba.com/contact_e/index.htm...

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