Hanna Instruments pH 211R Instruction Manual

Contents

Hanna Instruments pH 211R Instruction Manual Manual pdf 7 page image

1312For refillable electrodesIf the filling solution (electrolyte) is more than 2.5 cm (1") below thefill hole, add HI 7082 3.5M KCl electrolyte solution for double junctionor HI 7071 3.5M KCl+AgCl electrolyte solution for single junctionelectrodes.For a faster response, unscrew the fill hole screw during measure-ments.For AmpHel® electrodesIf the electrode does not respond to pH changes, the battery is rundown and the electrode should be replaced.MEASUREMENTRinse the electrode tip with distilled water. Immerse the tip (bottom 4cm /1½") in the sample and stir gently for a few seconds.For a faster response and to avoid cross contamination of the samples,rinse the electrode tip with a few drops of the solution to be tested,before taking measurements.STORAGETo minimize clogging and assure a quick response time, the glass bulband the junction should be kept moist and not allowed to dry out.Replace the solution in the protective cap with a few drops ofHI 70300storage solution or, in its absence, filling solution (HI 7071for single junction or HI 7082 for double junction electrodes). Followthe Preparation Procedure above before taking measurements.Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.PERIODIC MAINTENANCEInspect the electrode and the cable. The cable used for connection tothe meter must be intact and there must be no points of brokeninsulation on the cable or cracks on the electrode stem or bulb.Connectors must be perfectly clean and dry. If any scratches or cracksare present, replace the electrode. Rinse off any salt deposits withwater.For refillable electrodes:Refill the reference chamber with fresh electrolyte (HI 7071 for singlejunction or HI 7082 for double junction electrodes). Allow the elec-trode to stand upright for 1 hour.Follow the Storage Procedure above.AmpHel® is a registered Trademark of "Hanna Instruments"ELECTRODE CONDITIONING & MAINTENANCEPREPARATIONRemove the protective cap.DO NOT BE ALARMED IF SALT DEPOSITS ARE PRESENT. This is normalwith electrodes and they will disappear when rinsed with water.During transport tiny bubbles of air may form inside the glass bulbaffecting proper functioning of the electrode. These bubbles can beremoved by "shaking down" the electrode as you would do with aglass thermometer.If the bulb and/or junction is dry, soak the electrode in HI 70300storage solution for at least one hour.Note: To prevent damage to the pH electrode, remove it from thesolution before turning the meter off.With the meter OFF, detach the electrode from the instrumentand immerse it in the storage solution.