pH/ORP Electrode Maintenance and Use

Proper use and maintenance of the electrode will ensure maximum performance.

Contents:

  1. pH Electrode Instruction Guide
  2. Using pH Electrodes

  

pH Electrode Instruction Guide

Preparation

  • Remove the protective cap. DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT. This is normal with electrodes and they will disappear when rinsed with water.
  • Shake the electrode down as with a glass thermometer to eliminate any air bubbles inside the electrode.
  • If the bulb and/or junction are dry, soak the tip of the electrode in a Storage Solution (HI 70300M) or pH 7 (HI 7007M) or pH 4 (HI 7004M) buffer for at least an hour prior to using it.

Measurement:

  • Rinse the electrode tip with distilled or deionized water.
  • Immerse the tip in the sample, stir gently and wait for the reading to stabilize. For a faster response and to avoid cross contamination, rinse the tip with a few drops of the solution to be tested, before taking measurements.

Storage:

  • To minimize clogging and ensure a quick response time, the glass bulb of the pH electrode and the junction should be kept moist. Replace protective cap with a few drops of a Storage Solution (HI 70300M), or in its absence, pH 7 (HI 7007M) or pH 4 (HI 7004M) buffers.
  • NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.

Maintenance and Cleaning:

  • Rinse the electrode with clean water after use before putting it away and store it wet (see above).
  • Periodically clean the electrode thoroughly, by leaving it soaking for 10 to 15 minutes in a cleaning solution (for General Purpose use HI 7061M, for oily samples HI 7077M, for Inorganic samples HI 7074M and for protein etc. use HI 7073M cleaning solution).
  • Inspect the electrode for any scratches or cracks on the bulb or stem. If any are present, replace the electrode.

Trouble Shooting:

  • pH Meter: Follow attentively the meter's operating and calibration procedures from the manual.
  • Electrode: Evaluate your electrode performance based on the following possibilities:
  1. Noise: (Readings fluctuate) could be due to Clogged/Dirty Junction: Refer to Maintenance above; or Air Bubble insulating the junction: Shake the electrode down as with a clinical thermometer.
  2. Dry Membrane/Junction: Soak in a Storage Solution (HI 70300M) or pH 7 (HI 7007M) or 4 (HI 7004M) buffer for at least an hour.
  3. Drifting: Soak the electrode tip in warm (about 120 °F) pH 4 Solution (HI 7004M) for about an hour then rinse the tip with distilled or deionized water.
  4. Low Slope: Refer to Maintenance above.
  5. No Slope: (pH meter reads the same value all the time) Check for cracks in glass, stem or bulb. Replace electrode.
  6. Slow Response/Excessive Drift: Soak the tip in a Cleaning Solution (for General Purpose use HI 7061M, for oily samples HI 7077M, for Inorganic samples HI 7074M and for protein etc. use HI 7073M cleaning solution) for 30 minutes, rinse thoroughly with distilled or deionized water and then soak the electrode in a Storage Solution (HI 70300M) for an hour and recalibrate the meter.

Using pH Electrodes

Installing the Electrode

  1. All Hanna electrodes are shipped with a cap that protects the bulb and junction from damage. The cap must be REMOVED and set aside.
  2. Remove any salt (Potassium Chloride) deposit that may have formed on the surface of the electrode during storage or shipping by thorough rinsing with tap water. The presence of salt deposits is normal and generally indicates that the reference junction is open and free-flowing.
  3. Lower the rubber sleeve or unscrew the plug to expose the reference fill hole. This allows the reference chamber to "breath" and quickens the electrode's response time. This does not apply to gel and solid-filled electrodes.
  4. All refillable Hanna electrodes are shipped with the reference chamber filled. Once the level of the reference solution is 1/2" (1cm) below the fill hole, add more reference electrolyte with a syringe by unscrewing the plug or lowering the sleeve. Use 3.5 M KCl/AgCl Reference Electrolyte (HI 7071) for single junction electrodes and 3.5 M KCl (HI 7082) for double junction electrodes. Hold the electrode horizontally to obtain a level above the fill hole. Replace the plug or slide the cover back when finished.
  5. The electrode's glass bulb should always be kept wet. If dry, the tip should be soaked in Electrode Storage Solution (HI 70300) or in its absence, in pH 4 buffer or tap water for 2 hours to hydrate the pH glass membrane before use or calibration.
  6. Connect the electrode to the meter.


Storage:

  • To minimize clogging and ensure a quick response time, the tip and the junction should be kept moist. Replace protective cap with a few drops of a Storage Solution HI 70300M), or in its absence, pH 4 buffer (HI 7004M).
  • NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.

Maintenance and Cleaning:

  • Rinse the electrode with clean water after use before putting it away and store it wet (see above).
  • Periodically clean the electrode thoroughly, by leaving it soaking for 10 to 15 minutes in a cleaning solution (HI 7061M).
  • Inspect the electrode for any scratches or cracks on the bulb or stem. If any are present, replace the electrode.
  • The surface of the platinum electrode must be clean and smooth. To clean the ORP electrode, rinse it briefly in turpentine, then wash it with abundant water and polish it with a light abrasive lint-free (emery) material, if necessary. The surface of the platinum electrode must not be scratched in the process and all traces of these cleaning substances must be rinsed off.

Trouble Shooting:

  • Noise/Slow Response/Excessive Drift: Could be due to Clogged/Dirty Junction: Refer to Maintenance above; or Air Bubble insulating the junction: Shake the electrode down as with a glass thermometer.
  • Drifting: Use a an emery (lint free) cloth and rub the platinum tip of the ORP electrode thoroughly to remove any grease or deposits and then follow the cleaning procedure above.
  • No Slope: (Meter always reads the same value) Check for cracks in glass, stem or bulb and replace electrode.
Proper use and maintenance of the electrode will ensure maximum performance. Contents: pH Electrode Instruction Guide Using pH Electrodes    pH... read more »
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pH/ORP Electrode Maintenance and Use

Proper use and maintenance of the electrode will ensure maximum performance.

Contents:

  1. pH Electrode Instruction Guide
  2. Using pH Electrodes

  

pH Electrode Instruction Guide

Preparation

  • Remove the protective cap. DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT. This is normal with electrodes and they will disappear when rinsed with water.
  • Shake the electrode down as with a glass thermometer to eliminate any air bubbles inside the electrode.
  • If the bulb and/or junction are dry, soak the tip of the electrode in a Storage Solution (HI 70300M) or pH 7 (HI 7007M) or pH 4 (HI 7004M) buffer for at least an hour prior to using it.

Measurement:

  • Rinse the electrode tip with distilled or deionized water.
  • Immerse the tip in the sample, stir gently and wait for the reading to stabilize. For a faster response and to avoid cross contamination, rinse the tip with a few drops of the solution to be tested, before taking measurements.

Storage:

  • To minimize clogging and ensure a quick response time, the glass bulb of the pH electrode and the junction should be kept moist. Replace protective cap with a few drops of a Storage Solution (HI 70300M), or in its absence, pH 7 (HI 7007M) or pH 4 (HI 7004M) buffers.
  • NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.

Maintenance and Cleaning:

  • Rinse the electrode with clean water after use before putting it away and store it wet (see above).
  • Periodically clean the electrode thoroughly, by leaving it soaking for 10 to 15 minutes in a cleaning solution (for General Purpose use HI 7061M, for oily samples HI 7077M, for Inorganic samples HI 7074M and for protein etc. use HI 7073M cleaning solution).
  • Inspect the electrode for any scratches or cracks on the bulb or stem. If any are present, replace the electrode.

Trouble Shooting:

  • pH Meter: Follow attentively the meter's operating and calibration procedures from the manual.
  • Electrode: Evaluate your electrode performance based on the following possibilities:
  1. Noise: (Readings fluctuate) could be due to Clogged/Dirty Junction: Refer to Maintenance above; or Air Bubble insulating the junction: Shake the electrode down as with a clinical thermometer.
  2. Dry Membrane/Junction: Soak in a Storage Solution (HI 70300M) or pH 7 (HI 7007M) or 4 (HI 7004M) buffer for at least an hour.
  3. Drifting: Soak the electrode tip in warm (about 120 °F) pH 4 Solution (HI 7004M) for about an hour then rinse the tip with distilled or deionized water.
  4. Low Slope: Refer to Maintenance above.
  5. No Slope: (pH meter reads the same value all the time) Check for cracks in glass, stem or bulb. Replace electrode.
  6. Slow Response/Excessive Drift: Soak the tip in a Cleaning Solution (for General Purpose use HI 7061M, for oily samples HI 7077M, for Inorganic samples HI 7074M and for protein etc. use HI 7073M cleaning solution) for 30 minutes, rinse thoroughly with distilled or deionized water and then soak the electrode in a Storage Solution (HI 70300M) for an hour and recalibrate the meter.

Using pH Electrodes

Installing the Electrode

  1. All Hanna electrodes are shipped with a cap that protects the bulb and junction from damage. The cap must be REMOVED and set aside.
  2. Remove any salt (Potassium Chloride) deposit that may have formed on the surface of the electrode during storage or shipping by thorough rinsing with tap water. The presence of salt deposits is normal and generally indicates that the reference junction is open and free-flowing.
  3. Lower the rubber sleeve or unscrew the plug to expose the reference fill hole. This allows the reference chamber to "breath" and quickens the electrode's response time. This does not apply to gel and solid-filled electrodes.
  4. All refillable Hanna electrodes are shipped with the reference chamber filled. Once the level of the reference solution is 1/2" (1cm) below the fill hole, add more reference electrolyte with a syringe by unscrewing the plug or lowering the sleeve. Use 3.5 M KCl/AgCl Reference Electrolyte (HI 7071) for single junction electrodes and 3.5 M KCl (HI 7082) for double junction electrodes. Hold the electrode horizontally to obtain a level above the fill hole. Replace the plug or slide the cover back when finished.
  5. The electrode's glass bulb should always be kept wet. If dry, the tip should be soaked in Electrode Storage Solution (HI 70300) or in its absence, in pH 4 buffer or tap water for 2 hours to hydrate the pH glass membrane before use or calibration.
  6. Connect the electrode to the meter.


Storage:

  • To minimize clogging and ensure a quick response time, the tip and the junction should be kept moist. Replace protective cap with a few drops of a Storage Solution HI 70300M), or in its absence, pH 4 buffer (HI 7004M).
  • NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.

Maintenance and Cleaning:

  • Rinse the electrode with clean water after use before putting it away and store it wet (see above).
  • Periodically clean the electrode thoroughly, by leaving it soaking for 10 to 15 minutes in a cleaning solution (HI 7061M).
  • Inspect the electrode for any scratches or cracks on the bulb or stem. If any are present, replace the electrode.
  • The surface of the platinum electrode must be clean and smooth. To clean the ORP electrode, rinse it briefly in turpentine, then wash it with abundant water and polish it with a light abrasive lint-free (emery) material, if necessary. The surface of the platinum electrode must not be scratched in the process and all traces of these cleaning substances must be rinsed off.

Trouble Shooting:

  • Noise/Slow Response/Excessive Drift: Could be due to Clogged/Dirty Junction: Refer to Maintenance above; or Air Bubble insulating the junction: Shake the electrode down as with a glass thermometer.
  • Drifting: Use a an emery (lint free) cloth and rub the platinum tip of the ORP electrode thoroughly to remove any grease or deposits and then follow the cleaning procedure above.
  • No Slope: (Meter always reads the same value) Check for cracks in glass, stem or bulb and replace electrode.
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