Hanna Instruments HI 254 Instruction Manual

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29For refillable electrodes:If the filling solution (electrolyte) is more than 2Ω cm (1î) below the fill hole,add HI 7082 or HI 8082 3.5M KCl Electrolyte Solution for double junction orHI 7071 or HI 8071 3.5M KCl+AgCl Electrolyte Solution for single junctionelectrodes.For faster response, unscrew the fill hole screw during measurements.For AMPHELÆ electrodes:If the electrode does not respond to pH changes, the battery is run down andthe electrode should be replaced.MEASUREMENTRinse the electrode tip with distilled water. Immerse the tip (bottom 4 cm /1Ωî)in the sample and stir gently for a few seconds.For a faster response and to avoid cross-contamination of the samples, rinsethe electrode tip with a few drops of the solution to be tested, before takingmeasurements.STORAGE PROCEDURETo minimize clogging and assure a quick response time, the glass bulb andthe junction should be kept moist and not allowed to dry out.Replace the solution in the protective cap with a few drops of HI 70300 orHI 80300 Storage Solution or, in its absence, Filling Solution (HI 7071 orHI 8071 for single junction and HI 7082 or HI 8082 for double junctionelectrodes). Follow the Preparation Procedure on page 28 before takingmeasurements.Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.PERIODIC MAINTENANCEInspect the electrode and the cable. The cable used for connection to theinstrument must be intact and there must be no points of broken insulation onthe cable or cracks on the electrode stem or bulb. Connectors must be perfectlyclean and dry. If any scratches or cracks are present, replace the electrode.Rinse off any salt deposits with water.For refillable electrodes:Refill the reference chamber with fresh electrolyte (HI 7071 or HI 8071 forsingle junction and HI 7082 or HI 8082 for double junction electrodes). Allowthe electrode to stand upright for 1 hour.Follow the Storage Procedure above.All manuals and user guides at all-guides.com