Hach PLATINUM Series Manual
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Hach PLATINUM Series Manual

Hach PLATINUM Series Manual

Ph electrode
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Cat. No. 51910-88
PLATINUM SERIES
pH ELECTRODE
© Hach Company, 1999-2002. All rights reserved. Printed in China
te/dk 02/05 2ed

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Summary of Contents for Hach PLATINUM Series

  • Page 1 Cat. No. 51910-88 PLATINUM SERIES pH ELECTRODE © Hach Company, 1999-2002. All rights reserved. Printed in China te/dk 02/05 2ed...

  • Page 3: Table Of Contents

    1.3.1 Assembling the Electrode ..........10 1.3.2 Conditioning the Electrode ...........12 1.4 Measuring Hints ................13 1.5 Checking the Slope ..............14 1.6 Accessories.................14 1.6.1 Hach Low Ionic Strength Sample Chamber Kits ..14 1.6.2 Sample Bottles ..............15 1.7 General Applications ..............15 Section 2 Applications ............17 pH, Water and Wastewater .............19...

  • Page 5: Specifications

    Cable Connector • sens 5-Pin Connector (Cat. No. 51910-00) • Hach One™ Meter Series BNC & 3.5 mm Phone Connector (Cat. No. 51910-11) • EC Series BNC & DIN Connector (Cat. No. 51910-22) Fill Solution KCl Cartridges, Reference Gel (Cat. No. 25469-00)

  • Page 7: Safety Precautions

    Safety Precautions Please read this entire manual before unpacking, setting up, or operating this instrument. Pay particular attention to all danger and caution statements. Failure to do so could result in serious injury to the operator or damage to the equipment. To ensure the protection provided by this equipment is not impaired, do not use or install this equipment in any manner other than that which is specified in this manual.

  • Page 9: Section 1 Introduction

    Section 1 Introduction 1.1 Electrode Description ™ The sens Platinum Series pH Electrode (Figure 1) with a renewable, free flowing reference junction is a reliable electrode specifically designed for fast, accurate pH measurement. ™ sens Figure 1 Platinum Series pH Electrodes...

  • Page 10: Electrolyte Description

    The Platinum Series pH Electrode, Model 51910, uses a full range pH glass that balances speed of response, full range, and longevity. It is suitable for a wide variety of samples, including hard-to-measure, pure water samples.
  • Page 11 2. Place the dispenser unit over the electrolyte cartridge. Screw the dispenser unit onto the electrode body until it stops turning. Do not over tighten. Figure 2 Assembling the Platinum Series Electrode Note: The electrode will be automatically primed by screwing the dispenser unit onto the electrode body.

  • Page 12: Conditioning The Electrode

    Save the bottle for reuse. Between uses: Between sample measurements of medium to high conductivity, store the electrode in Hach electrode storage solution, a pH 6.35/1.7 M KCl buffer solution. The solution keeps the bulb hydrated and prevents the reference gel from solidifying in the reference junction.

  • Page 13: Measuring Hints

    Introduction, continued 1.3.2.2 Low Ionic Strength (LIS) Conditioning (For measurements in samples of low ionic strength, approximately 150 µS/cm or less): Initial use: Before measuring a LIS sample, pre-soak the electrode in a solution similar to the sample in ionic strength and pH for 10 to 15 minutes.

  • Page 14: Checking The Slope

    A slope of -58 ±3 mV indicates a properly functioning electrode. 1.6 Accessories 1.6.1 Hach Low Ionic Strength Sample Chamber Kits The Hach Low Ionic Strength Sample Chamber Kit (Cat. No. 51899-00) prevents sample contamination by carbon dioxide.

  • Page 15: Sample Bottles

    • Continuous sampling in aqueous samples up to 45 °C and intermittent sampling in aqueous samples up to 100 °C. For information regarding applications not described in this manual, contact Hach Technical and Customer Service.

  • Page 17: Section 2 Applications

    Section 2 Applications...

  • Page 19: Ph, Water And Wastewater

    Electrolyte Gel dispenser button until pH/ISE Cartridge in the gel comes out of the meter. Platinum Series pH reference junction. Note: Ensure that the Section Electrode. (See Rinse excess gel from electrode has been 1.3.1 on page the tip and the outlet.
  • Page 20 pH, Water and Wastewater, continued setup pH mV Turn on the meter Press . Press In three 50-mL SETUP by pressing . Press the up arrow three beakers or cups, until the times. Press prepare buffers of 4.0, PH MV ENTER display shows pH.
  • Page 21 7.0 buffer. Press blot dry. . The display Standard 1?. ENTER shows: Stabilizing... Note: Temperature variation causes changes in buffer pH. Hach sens meters correct for these changes during calibration when using buffers of pH 4,6.86, 7, and 10.
  • Page 22 pH, Water and Wastewater, continued READ enter When a stable pH Place the electrode After the last is determined, the in the 4.0 (or 10.0) pH calibration point has display will show buffer. Press stabilized and the ENTER Standard 2?. Remove display reads Standard the electrode from the 3?, press...
  • Page 23 pH, Water and Wastewater, continued Store or record the pH and temperature readings when they stabilize. Sampling and Storage Collect samples in clean plastic or glass bottles. Fill completely and cap tightly. Analyze samples immediately, preferably in the field. Accuracy Check Checking Electrode Response An electrode is responding properly if its calibration slope is -58 ±3 mV per pH unit.
  • Page 24 LIS or high purity methods. The Platinum Series Combination pH Electrode responds to the hydrogen ion concentration (activity) by developing an electrical potential. At a constant temperature, this potential varies linearly with the pH of the solution being measured.
  • Page 25 REQUIRED REAGENTS AND APPARATUS Quantity Required Description Per Test Unit Cat. No. Platinum Series Combination pH Electrode w/Temp..........1 ....each..51910-00 sens ™2 Portable pH/ISE Meter..1 ....each..51725-10 Potassium Chloride Electrolyte Cartridge1..2/pkg... 25469-02 OPTIONAL REAGENTS Buffer, Powder Pillow pH 4.01, color-coded red ......15/pkg ..22269-95 pH 6.86 ............

  • Page 27: Ph, High Purity Water

    Electrolyte Gel dispenser button until pH/ISE Cartridge in the gel comes out of the meter. Platinum Series pH reference junction. Note: Ensure that the Section Electrode. (See Rinse excess gel from electrode has been 1.3.1 on page the tip and the outlet.
  • Page 28 pH, High Purity Water, continued setup pH mV Turn on the meter Press . Press In three 50-mL SETUP by pressing . Press the up arrow three beakers or cups, until the times. Press prepare buffers of 4.0, PH MV ENTER display shows pH.
  • Page 29 7.0 buffer. Press blot dry. . The display Standard 1?. ENTER shows: Stabilizing... Note: Temperature variation causes changes in buffer pH. Hach sens meters correct for these changes during calibration when using buffers of pH 4, 6.86, 7, and 10.
  • Page 30 pH, High Purity Water, continued READ enter When a stable pH Place the electrode After the last is determined, the in 4.0 (or 10.0) pH calibration point has display will show buffer. Press stabilized and the ENTER display reads Standard 2?. Standard 3?, press Remove the electrode EXIT...
  • Page 31 pH, High Purity Water, continued READ enter The display will Condition the Remove from show Store?. Press electrode for 10 deionized water. Prime to store the minutes in deionized the reference junction ENTER calibration or water. by clicking the pump EXIT leave the calibration until fresh gel emerges.
  • Page 32 pH, High Purity Water, continued Connect the inlet Adjust inlet flow Allow three tube from the sample to slowly fill the volumes to pass source to the sample chamber from the through the chamber. chamber. bottom up. Allow Shut off sample flow. excess sample to flow Note: The inlet tube from the overflow...
  • Page 33 This method minimizes atmospheric (mainly carbon dioxide) contamination of the sample. The Platinum Series Combination pH Electrode responds to the hydrogen ion concentration (activity) by developing an electrical potential. At a constant temperature, this potential...
  • Page 34 REQUIRED REAGENTS AND APPARATUS Quantity Required Description Per Test Unit Cat. No. Platinum Series™ Combination pH Electrode w/Temp..........1 ....each ... 51910-00 sens ™4 Laboratory pH/ISE Meter, 115 VAC..........1 ....each ...51775-10 sens ™4 Laboratory pH/ISE Meter, 230VAC ..........1 ....each ...

  • Page 35: Ph, Low Ionic Strength (Lis) Water

    Electrolyte Gel dispenser button until pH/ISE Cartridge in the gel comes out of the meter. Platinum Series pH reference junction. Note: Ensure that the Section Electrode. (See Rinse excess gel from electrode has been 1.3.1 on page the tip and the outlet.
  • Page 36 pH, Low Ionic Strength (LIS) Water, continued pH mV Turn on the meter Press . Press In three 50-mL SETUP by pressing . Press the up arrow three beakers or cups, until the times. Press prepare buffers of 4.0, PH MV ENTER display shows pH.
  • Page 37 7.00 buffer. Press blot dry. . The display Standard 1?. ENTER shows: Stabilizing... Note: Temperature variation causes changes in buffer pH. Hach sens meters correct for these changes during calibration when using buffers of pH 4, 6.86, 7, and 10.
  • Page 38 pH, Low Ionic Strength (LIS) Water, continued READ enter When a stable pH Place the electrode After the last is determined, the in the 4.0 (or 10.0) pH calibration point has display will show buffer. Press stabilized and the ENTER display reads Standard 2?.
  • Page 39 pH, Low Ionic Strength (LIS) Water, continued Rinse electrode Fit the electrode If not using a with a small volume of into the clean LIS sample collection deionized water or sample chamber lid bottle that fits the sample and blot dry. and plug inlet and sample chamber, outlet ports with...
  • Page 40 This method reduces atmospheric (mainly carbon dioxide) contamination to the sample. The Platinum Series Combination pH Electrode responds to the hydrogen ion concentration (activity) by developing an electrical potential. At a constant temperature, this potential...
  • Page 41 Platinum Series Combination pH Electrode w/Temp..........1 ....each..51910-00 sens ™2 Portable pH/ISE Meter..1 ....each..51725-10 Potassium Chloride Electrolyte Cartridge1..2/pkg... 25469-02 Hach Low Ionic Strength Sample Chamber1..each... 51899-00 OPTIONAL REAGENTS Buffer, Powder Pillow pH 4.01, color-coded red ......15/pkg ..22269-95 pH 6.86 ............15/pkg ..14098-95 pH 7.00, color-coded yellow.......

  • Page 43: Section 3 Electrode Maintenance

    Section 3 Electrode Maintenance The Platinum Series pH electrode contains a sensing glass bulb and a liquid reference junction optimized for performance in difficult, cold, neutral, and low ionic strength (LIS) solutions. This sensitive instrument has been designed to give trouble- free use, but requires careful handling to extend longevity.

  • Page 44: Cleaning The Electrode

    Electrode Maintenance, continued entire reference electrolyte gel cartridge can become diluted through diffusion. Typically this will not harm the Ag/AgCl reference element, but the electrolyte cartridge itself will be ruined. This storage method keeps the electrode ready to use, but requires purging the gel every day. Shelf Storage: For very long-term storage, store the electrode dry.
  • Page 45 Electrode Maintenance, continued After cleaning, refresh reference half cells by pumping fresh electrolyte through them. If the electrode has been sitting in a sample for several weeks, the reference gel will become diluted. In this case, discard the cartridge and replace it with a fresh one.

  • Page 47: Section 4 Platinum Series Ph Electrode Characteristics

    This is known as the zero potential point. Both the isopotential point and the zero potential point are features designed into electrodes. Hach electrodes are designed so the isopotential and zero potential...

  • Page 48: Sodium Error Interferences

    Section 4, continued calibration point. At 25 °C, the slope of an electrode performing at 100% efficiency will decrease by 59.2 mV for every unit increase in pH. 4.2 Sodium Error Interferences Sodium error occurs at elevated pH values due to the pH glass’ inability to discriminate between sodium ions and acidic H ions (specifically, solvated hydronium ions, H ).

  • Page 49: Section 5 Troubleshooting

    Section 5 Troubleshooting Symptom Cause Remedy Electrode is improperly Check connection. response connected to meter. If a two-channel meter, is Reconnect the electrode to the electrode connected to the desired channel or the displayed channel? change the displayed (A shorting cap on a channel channel on the meter.
  • Page 50 Troubleshooting, continued Symptom Cause Remedy Out-of- See “No response”, above. The bulb may be broken. range response Erratic Reference junction contains Push dispenser button and response bubbles. turn clockwise two turns. Electrode is not plugged in Plug electrode into meter to selected meter channel.
  • Page 51 Troubleshooting, continued Symptom Cause Remedy Low slope Bulb is old. Replace electrode. Section Bulb is dirty. Clean according to on page Standards are inaccurate. Make sure standards were entered into meter correctly. Use only NIST traceable buffers. Use fresh buffers. Change buffers frequently.

  • Page 53: Electrode Service Request Questionnaire

    Electrode Service Request Questionnaire 1. What model of meter is the electrode being used with? 2. What is the model number of the electrode? 3. What is the complete lot code of the electrode (located on the electrode cable)? 4. What is the date the electrode was purchased? 5.

  • Page 55: Glossary

    Glossary Acid—a chemical compound that contributes hydrogen ions ) to an aqueous solution or causes the pH to be less than 7.0. Acidic—A solution or system with a pH less than 7.0. Activity—The measure of work performed by an ion as it moves through a system.
  • Page 56 Glossary, continued regardless of solution composition. The sensing half-cell develops a potential proportional to solution composition. Conditioning—The process of preparing an electrode for use by soaking the electrode in a solution with a pH and ionic strength similar to the sample. Conditioning allows the formation of the hydrated layer, necessary for accurate measurements.
  • Page 57 Glossary, continued Ion—An atom, group of atoms or molecule that is electrically charged as the result of gaining or losing electrons. An ion resulting from the gain of electrons becomes negative (anion), while an ion resulting from the loss of electrons becomes positive (cation).
  • Page 58 Glossary, continued Sensing half-cell—Provides a voltage proportional to the concentration of a specific ion in solution. Siemen—The unit of conductivity equivalent to mho (ohm Conductivity is often expressed as microSiemens per centimeter (µS/cm) and milliSiemens per centimeter (mS/cm) and it is a measure of how readily a sample conducts electricity. More concentrated solutions conduct more electricity and have higher conductivity.

  • Page 59: General Information

    General Information At Hach Company, customer service is an important part of every product we make. With that in mind, we have compiled the following information for your convenience.

  • Page 61: How To Order

    Call 1-800-227-4224 or E-mail techhelp@hach.com. International Customers Hach maintains a worldwide network of dealers and distributors. To locate the representative nearest you, send E-mail to intl@hach. com or contact: In Canada, Latin America, Africa, Asia, Pacific Rim: Telephone: (970) 669-3050;...

  • Page 62: Repair Service

    Repair Service Authorization must be obtained from Hach Company before sending any items for repair. Please contact the HACH Service Center serving your location. In the United States: Hach Company 100 Dayton Avenue Ames, Iowa 50010 (800) 227-4224 (U.S.A. only)

  • Page 63: Warranty

    HACH WARRANTS TO THE ORIGINAL BUYER THAT HACH PRODUCTS WILL CONFORM TO ANY EXPRESS WRITTEN WARRANTY GIVEN BY HACH TO THE BUYER. EXCEPT AS EXPRESSLY SET FORTH IN THE PRECEDING SENTENCE, HACH MAKES NO WARRANTY OF ANY KIND WHATSOEVER WITH RESPECT TO ANY PRODUCTS.

This manual is also suitable for:

51910-8851910-0051910-1151910-22

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