User manual HANNA INSTRUMENTS HI 96750

[. . . ] Instruction Manual HI 96750 Potassium LR and MR ISM www. hannainst. com 1 Dear Customer, Thank you for choosing a Hanna product. This manual will provide you with the necessary information for the correct use of the instrument. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. TABLE OF CONTENTS PRELIMINARY EXAMINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] · In order to maximize accuracy, prior to a measurement follow the validation procedure to be sure that the instrument is properly calibrated. If necessary, calibrate the instrument. STARTUP Prepare the instrument for measurement as follows: · Unpack the instrument by removing the dust protection sleeve from the instrument cuvette holder. · Place the battery in the instrument as described in the "BATTERY REPLACEMENT" chapter. 12 RANGE SELECTION The HI 96750 can measure Potassium LR when range P1 is selected, Potassium MR when range P2 is selected. To change the active range follow the procedure: · Turn the meter on by pressing ON/OFF. · After startup, the range identification number is displayed on the secondary LCD as P1 or P2. Code P1 P2 Parameter Potassium LR Potassium MR · Press RANGE/GLP/ to change the range. The range can be changed any time when the instrument is in measurement mode. The selected range is memorized and the selection remaines unchanged at power off or when the battery is removed. MEASUREMENT PROCEDURE To compensate the meter for the sample turbidity or color, the measurement takes place in two phases. · When the beeper sounds briefly and the LCD displays dashes, the meter is ready. The blinking "ZERO" indicates that the instrument needs to be zeroed first. 13 · Fill the cuvette with 10 mL of unreacted sample, up to the mark, and replace the cap. · Add six drops of HI 93750A-0, replace the cap and swirl the solution. · Place the cuvette into the cuvette holder and ensure that the notch on the cap is positioned securely into the groove. · Press ZERO/CFM and the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. · After a few seconds, the display will show "-0. 0-". Replace the cap and shake gently for about 1 minute to dissolve most of the reagent. · Replace the cuvette into the cuvette holder and ensure that the notch on the cap is positioned securely into the groove. In both cases, the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. · At the end of measurement, the instrument directly displays concentration in mg/L of potassium on the LCD. 14 · If the analysis result is over the method range, the sample should be diluted. · To measure exactly 10 mL of sample with the 5 mL syringe, push the plunger completely into the syringe and insert the tip into the sample. [. . . ] The instrument asks for confirmation of user calibration delete. · Press ZERO/CFM to restore the factory calibration or press RANGE/GLP/ again to abort factory calibration restore. · The instrument briefly notifies "done" when restores factory calibration and returns to measurement mode. BATTERY MANAGEMENT To save battery, the instrument shuts down after 10 minutes of non-use in measurement mode and after 1 hour of non-use in calibration mode. If a valid measurement was displayed before auto-shut off, the value is displayed when the instrument is switched on. The blinking "ZERO" means that a new zero has to be performed. [. . . ]