User manual HANNA INSTRUMENTS HI 98402

[. . . ] 6 CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 TEMPERATURE CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ELECTRODE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 BATTERY REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] · Immerse the temperature probe at least 1 cm (½") in the prepared sample. The temperature of the solution will be shown on the lower part of the display. 7 CALIBRATION In order to obtain accurate measurements, frequent calibration is recommended. For better results, calibrate at a temperature close to that of the solution to be tested (no more than ±3°C apart). Calibration points can be chosen among 1 ppm fluoride, 2 ppm , 10 ppm, 100 ppm and 1000 ppm. PREPARATION · The HANNA calibration solutions at 1 ppm (HI 4010-11), 2 ppm (HI 4010-12) and 10 ppm (HI 4010-10) are already mixed with TISAB II solution, while for 100 ppm (HI 4010-02) and 1000 ppm (HI 4010-05) it is necessary to prepare the calibration solutions by mixing with TISAB II (HI 4010-00), 50% and 50%. · Attach the fluoride and reference electrodes and the temperature probe to their respective connectors on top of the meter. Note: For best results, it is recommended to prepare two beakers for each calibration point: the first one to rinse the probes and the second one to calibrate. 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 4010-10 (10 ppm fluoride solution + TISAB) for at least 3 hours prior to measurement. · Rinse the electrodes with deionized water and dry them attentively with a non-abrasive cloth. · Immerse the fluoride and the reference electrode as well as the temperature probe at least 1 cm (½") in the calibration 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. 8 · Press CAL. The display will show "CAL" and "BUF" together with an intermittent "~" symbol. The upper display will show the calibration point (10 ppm) with the temperature of the solution shown on the lower LCD. · If the STD button is pressed, the instrument cycles through all the available calibration values. · When the CON symbol appears, it means that the calibration solution has been recognized and the reading has stabilized. Press CFM to confirm the first calibration point. Note: If the calibration solution value measured by the meter is too far from the ideal value, the " " symbol starts blinking to indicate an error in the calibration procedure. Ensure that the calibration solution is fresh and the correct one (in this case 10 ppm), and that the electrodes are in good working condition. · After pressing CFM, the display shows the second calibration point. · Press STD to choose the point corresponding to the second calibration solution. The instrument cycles through all the available calibration values, skipping the standard used as the first calibration point. 9 · Immerse the fluoride and reference electrodes at least 1 cm (½") in the second calibration 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. [. . . ] If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization number from the Customer Service department and then send it with shipping costs prepaid. When shipping any instrument, make sure it is properly packaged for complete protection. CE DECLARATION OF CONFORMITY Recommendations for Users Before using this product, make sure that it is entirely suitable for the environment in which it is used. Operation of this instrument in residential areas could cause unacceptable interferences to radio and TV equipment. [. . . ]