Brand (pet name): LAQUA Series name: Benchtop pH/Water Quality Analyzer Model: DS-71G Model description: COND METER Be sure to read this manual before using the product to ensure proper and safe operation of the instrument. Also safely store the manual so it is readily possible whenever necessary.
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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.
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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.
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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...
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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...
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.
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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.
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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.
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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...
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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 ●...
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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.
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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.
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 ●...
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. ●...
■ Product Handling Information ............. XIII ■ Manual Information ................XIV Chapter 1 About DS-71G ................1 Chapter 2 Information of DS-71G ............. 2 2.1 Measurement Items ................2 2.2 Packing List .................... 3 2.3 Names and Functions ................4 2.3.1 Names of Each Part ................
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Contents 3.5 Data Operation ..................50 3.5.1 Data Memory of Measurement Value ........... 50 3.5.2 Memory Data Display ..............51 3.5.3 Memory Data Printing ..............52 Chapter 4 Maintenance and Troubleshooting ........54 4.1 Conductivity Electrode Maintenance ..........54 4.2 Troubleshooting ................... 55 4.2.1 Error Message Chart ..............
Chapter 1 About DS-71G Chapter 1 About DS-71G The benchtop type COND METER DS-71G is optimized for laboratory measurement, and allows you to measure conductivity, resistivity, salinity, and TDS. 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.
Chapter 2 Information of DS-71G 2.2 Packing List Packing List The DS-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.
Chapter 2 Information of DS-71G 2.3 Names and Functions Names and Functions 2.3.1 Names of Each Part Stand arm Display Stopper Stand base Operation key CH2 reference electrode CH2 measurement electrode CH2 temperature electrode Printer connector AC adapter connector...
Chapter 2 Information of DS-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.
Chapter 2 Information of DS-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 parameter Measurement Calibration unit status...
Chapter 2 Information of DS-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.
Chapter 2 Information of DS-71G 2.5 Setting (SET) Flow Chart Setting (SET) Flow Chart Temperature compensation ATC, MTC function setting ▲▼ key Automatic data memory ON, OFF setting ▲▼ key Sample ID setting ▲▼ key Conductivity S/cm, S/m, mS/cm unit setting ▲▼...
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...
Chapter 3 Basic Operation 3.1 Preparation 3.1.2 Electrode Connection CH2 reference electrode CH2 measurement electrode CH2 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.
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.
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)
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.
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.
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Chapter 3 Basic Operation 3.2 Settings If you select MTC, press the key to select a digit and press the ▲ or ▼ key to change the value, and then press the ENTER key. Setting range: 0C to 100C In Automatic Temperature Compensation (ATC), the instrument detects the solution temperature.
Chapter 3 Basic Operation 3.2 Settings 3.2.2 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.
Chapter 3 Basic Operation 3.2 Settings 3.2.3 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 ▲...
Chapter 3 Basic Operation 3.2 Settings 3.2.4 Conductivity Unit Setting Select the unit of electric conductivity measurement among S/cm, S/m, and mS/cm . When mS/cm is selected, the unit is fixed to mS/cm. Press the SET key on the measurement screen, and press the ▲...
Chapter 3 Basic Operation 3.2 Settings 3.2.5 Conductivity Temperature Coefficient Setting Set the coefficient used for temperature compensation in electric conductivity measurement (Input range: 0.00% to 10.00%). The default is 2.00%. Press the SET key on the measurement screen, and press the ▲ or ▼ key to enter the conductivity unit setting screen.
Chapter 3 Basic Operation 3.2 Settings 3.2.6 Conductivity Cell Constant Setting Set the cell constant of electrode (Setting range: 0.700 to 1.300). When using an electrode for the instrument for the first time, set the cell constant written on the label of the electrode.
Chapter 3 Basic Operation 3.2 Settings Press the key to select digit and press the ▲ or ▼ key to change value, and press the ENTER key. Setting range: 0.700 to 1.300 3.2.7 Salinity Unit Setting You can select the unit of salinity measurement between PPT and %.
Chapter 3 Basic Operation 3.2 Settings 3.2.8 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. ・You perform data memory during measurement. ・Calibration or check is completed in the calibration mode.
Chapter 3 Basic Operation 3.2 Settings 3.2.9 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.
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Chapter 3 Basic Operation 3.2 Settings Press the ENTER key to return to the maintenance item selecting screen. ● 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.
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Chapter 3 Basic Operation 3.2 Settings Press the ENTER key to start the printing. 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.
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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.
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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.
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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 ▲...
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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.
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Chapter 3 Basic Operation 3.2 Settings ● Calibration Data Clearing You can delete the calibration data of conductivity and salinity to initialize them. Note that this operation is irreversible. Press the SET key on the measurement screen, and press the ▲ or ▼ key to enter the maintenance screen.
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Chapter 3 Basic Operation 3.2 Settings Press the ENTER key and the key to select the measurement item to be deleted Press the ENTER key to enter the calibration data deleting (Yes/No) screen. Press the key to select Yes, and press ENTER key to delete the calibration data.
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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.
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Chapter 3 Basic Operation 3.2 Settings ● Temperature Calibration You can perform calibration of the temperature sensor of an electrode. 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.
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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.
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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"...
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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 ▲...
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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.
Chapter 3 Basic Operation 3.3 Calibration Calibration 3.3.1 Conductivity Calibration The cell constant of the electrode may change according to the using conditions. The calibration updates the cell constant to be appropriate for the current electrode. Wash the electrode with pure water (deionized), and wipe it off by filter paper or tissue paper.
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Chapter 3 Basic Operation 3.3 Calibration The conductivity value of the standard solution used in the calibration process is the compensated value into the calibrating temperature by the temperature coefficient 2%/°C from the 25°C value. For more precise measurement, it is recommended to operate the calibration process at 25°C.
Chapter 3 Basic Operation 3.3 Calibration 3.3.2 Salinity Calibration You can perform 1 point calibration using a salinity stan- dard solution. Prepare the electrode. Wash the electrode with pure water (deionized), and wipe it off by filter paper or tissue paper. Immerse the electrode in the desired standard solution used for calibration.
Chapter 3 Basic Operation 3.3 Calibration 3.3.3 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.
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.
Chapter 3 Basic Operation 3.4 Measurement 3.4.3 Auto Data Memory The instrument can perform data memory automatically at a regular interval. Refer to "3.2.2 Auto Data Memory Setting" P.18 for the setting operations. If the auto power off setting is ON, it is temporarily OFF while this function is active.
Chapter 3 Basic Operation 3.4 Measurement 3.4.4 Measurement Value Printing You can print out measurement values or the HOLD value. When the automatic printout setting is ON, automatic printout is executed at the following occasions. ・You perform data memory during measurement. ・Calibration or check is completed in the calibration mode.
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Chapter 3 Basic Operation 3.4 Measurement ● Salinity measurement mode HOLD condition ① At HOLD: AUTO ① Instant value: INST Temperature ② ② compensation setting ③ ④ At Manual mode: MTC ⑤ At Auto mode: ATC ⑥ Sample ID ③ ⑦...
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Chapter 3 Basic Operation 3.4 Measurement ● Resistivity measurement mode HOLD condition ① At HOLD: AUTO Instant value: INST ① Temperature ② compensation setting ② At Manual mode: MTC ③ ④ At Auto mode: ATC ⑤ Sample ID ③ ⑥ Instrument model ④...
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.46 for automatic data memory. Press the DATA key to enter the data operation screen.
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.
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.51. Press the ENTER key. The displayed measurement data is printed out. ●...
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Chapter 3 Basic Operation 3.5 Data Operation ● Salinity measurement mode Memory number ① ① HOLD condition ② At HOLD: AUTO ② Instant value: INST Temperature ③ ③ compensation setting ④ At Manual mode: MTC ⑤ ⑥ At Auto mode: ATC Sample ID ④...
Chapter 4 Maintenance and Troubleshooting 4.1 Conductivity 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.
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."...
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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.
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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.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.
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Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting ● ERROR No.0011 Cell constant out of range Definition The cell constant is out of the automatic calculation range. Cause Countermeasure COND electrode is at Replace the electrode. the end of the useful life.
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 There are air bub- Shake the electrode to remove the air bles on the elec-...
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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.
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Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting ● The measured value is blinks. ・The conductivity value is outside the display range (when conductivity value is displayed). Display range: 0.00 to 19.99 (when cell constant is 100 m Cause Countermeasure The sample is Use a sample within the measurement inappropriate.
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Chapter 4 Maintenance and Troubleshooting 4.2 Troubleshooting Cause Countermeasure The setting of the Initialize the settings referring to " ● temperature cali- Setting Initialization" P.36. bration is failed. ● Printout is not made even when a printer is connected. Check the following points. ・...
Chapter 5 Specifications Specifications ● Model information Item Description Brand (pet name) LAQUA Series name Benchtop pH/Water Quality Analyzer Model DS-71G Model description COND METER ● Measuring object Measuring Item Description object Measuring principle Thermistor method Measuring range 0.0C to 100.0C...
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Chapter 5 Specifications 5.1 Specifications Measuring Item Description object Conversion from conductivity Measuring principle value Cell constant 1 cm 0.000 k•cm to 19.99 M•cm Cell constant 0.1 cm Measuring range Resistivity 0.00 k•cm to 199.9 M•cm Cell constant 10 cm ...
Chapter 5 Specifications 5.2 Default Settings Default Settings Item Description Default value Temperature Automatic temperature compensation compensation (ATC) Manual temperature 25C compensation value Auto power off Common Sample ID 0000 settings Calibration interval Password Auto data memory Auto print Unit S/cm Temperature coefficient 2.00%/C (ON)
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...
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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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