User manual HANNA INSTRUMENTS HI 98401

[. . . ] Instruction Manual HI 98401 Microprocessor-based Portable Fluoride Meter Dear Customer, Thank you for choosing a Hanna product. Please read this instruction manual carefully before using the meter. This manual will provide you with the necessary information for a correct use of the instrument, as well as a more precise idea of its versatility. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] The first point of calibration is fixed at 100 ppm (HI 70703). The second point can be selected between 10. 0 (HI 70702) and 1000 ppm (HI 70701). If the sample to be tested has low ionic strength (below 100 ppm), use HI 70702 for the second point. Likewise, with sample concentrations above 100 ppm, use HI 70701 as the second calibration point. PREPARATION · Use only clean beakers. Prepare two calibration solutions by mixing sufficient quantity of 50% HI 70703 (100 ppm) and 50% HI 7023 (TISAB) solution in one beaker and then 50% of HI 70702 (10. 0 ppm) or HI 70701 (1000 ppm) solution and 50% HI 7023 (TISAB) in the other. · Attach the fluoride electrode (#3 on page 4), the reference electrode (#2) and the temperature probe (#1) to their respective connectors on top of the meter. · Switch the meter on by pressing the ON/OFF button. Note: For best results, it is recommended to prepare two beakers for each calibration point: one beaker to rinse and the second one to calibrate. This minimizes contamination of the calibration solutions. Note: Use plastic beakers to minimize electro-magnetic interference. CALIBRATION PROCEDURE Note: If the fluoride electrode is new, or it has not been used for a few days, it must be soaked in a solution of HI 70702 (10 ppm of F-) for at least 3 hours prior to calibration. · Rinse the electrodes with deionized water and dry them attentively with a non-abrasive cloth. 8 MAGNETIC STIRRER HI 190M POWER ON OFF MAX SPEED Note: If the temperature probe is not connected, the meter will naturally not compensate for the temperature variance. In this case, accurate fluoride measurements are only possible if the temperature of the sample and the calibration solutions are close (no more than ±3°C apart). TEMPERATURE MEASUREMENT The temperature can be measured independently from fluoride concentration. · Immerse the temperature probe to a depth of at least 1 cm (½") in the prepared sample. · Wait for the reading to stabilize. The temperature of the solution will be shown on the lower part of the display. 7 · Immerse the fluoride and the reference electrode as well as the temperature probe to a depth of at least 1 cm (½") in the prepared buffer solution. Make sure that the electrodes are not touching the bottom of the beaker. Immerse the temperature probe close to the tip of the other electrodes. The display will show "CAL" and "BUF" together with an intermittent "~" symbol. The upper display will show the calibration point (100 ppm) with the temperature of the solution shown on the lower LCD. · Immerse the fluoride and the reference electrode to a depth of at least 1 cm (½") in the second buffer solution. Make sure that the electrodes are not touching the bottom of the beaker. [. . . ] · Reading drifts: Submerge the tip of the reference electrode in a HI 7082 or HI 8082 solution at a temperature of 50-60°C for about an hour. · No slope (meter always reads the same value) : Bulb or the stem of the fluoride electrode might be cracked. Repeat the measurement with a fresh fluoride electrode. · Response (of the fluoride electrode) is sluggish: Immerse the fluoride electrode in a HI 70702 solution for 3 hours. ACCESSORIES Calibration Solutions HI 70701/1L 1000 ppm F - solution, 1 L HI 70701L 1000 ppm F - solution, 460 mL HI 70701M 1000 ppm F - solution, 230 mL HI 70702/1L 10. 0 ppm F - solution, 1 L HI 70702L 10. 0 ppm F - solution, 460 mL HI 70702M 10. 0 ppm F - solution, 230 mL HI 70703/1L 100 ppm F- solution, 1 L HI 70703L 100 ppm F- solution, 460 mL HI 70703M 100 ppm F- solution, 230 mL HI 7023/1L TISAB II solution, 1 L HI 7023L TISAB II solution, 460 mL Cleaning Solutions HI 7061M General purpose cleaning solution, 230 mL HI 7061L General purpose cleaning solution, 460 mL HI 7073M Protein cleaning solution, 230 mL HI 7073L Protein cleaning solution, 460 mL HI 7077M Oil and fat cleaning solution, 230 mL HI 7077L Oil and fat cleaning solution, 460 mL HI 7082 Electrolyte solution 3. 5M KCl, 4x30mL HI 8061M General cleaning solution, 230 mL FDA approved bottle HI 8061L General cleaning solution, 460 mL FDA approved bottle HI 8073M Protein cleaning solution, 230 mL FDA approved bottle HI 8073L Protein cleaning solution, 460 mL FDA approved bottle HI 8077M Oil and fat cleaning solution, 230mL FDA approved bottle HI 8077L Oil and fat cleaning solution, 460mL FDA approved bottle HI 8082 Electrolyte solution 3. 5M KCl, 4x30mL FDA approved Another Accessories FC 301B Fluoride electrode, 1m cable and BNC connector HI 5313 Reference electrode, 1m cable and connector HI 7662 Temperature probe, 1m cable and connector HI 740027 1. 5V AA battery (4 pcs) HI 76405 Electrode holder BATTERY REPLACEMENT When the batteries are run down "LOBAT" is displayed on the Liquid Crystal Display. 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