User manual HANNA INSTRUMENTS HI 96748

[. . . ] Follow the instructions of the measurement procedure for zeroing the meter. Under range: A blinking "0. 000" indicates that the sample absorbs less light than the zero reference. Check the procedure and make sure you use the same cuvette for reference (zero) and measurement. Over Range: A flashing value of the maximum concentration indicates an over range condition. [. . . ] 5· Add 0. 2 mL of the HI 93748B-0 Alkalinecyanide reagent solution to each cuvette, replace the caps and invert gently to mix for about 30 seconds. 6· Add 1 mL of the HI 93748C-0 0. 1% PAN indicator solution to each cuvette, replace the caps and shake gently. 7· Place the cuvette with the reacted deionized water (blank) into the holder and ensure that the notch on the cap is positioned securely into the groove. 8· Press READ/ /TIMER and the display will show the countdown prior to zeroing the blank. Alternatively wait for 30 seconds and then 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-". The meter is now zeroed and ready for measurement. 9· Insert the second cuvette with the reacted sample into the holder and ensure that the notch on the cap is positioned securely into the groove. In all cases the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. 10·At the end of measurement, the instrument 10 directly displays concentration in µg/L of manganese on the LCD. Note: A temperature above 30 °C may cause turbidity. In this case, before zeroing and taking readings, add 2-3 drops of Dispersing agent (HI 93703-51) to each cuvette and swirl until complete dissolution of turbidity. INTERFERENCES: Interference may be caused by: Aluminum above 20 mg/L Cadmium above 10 mg/L Calcium above 200 mg/L as CaCO3 Cobalt above 20 mg/L Copper above 50 mg/L Iron above 10 mg/L Lead above 0. 5 mg/L Magnesium above 100 mg/L as CaCO3 Nickel above 40 mg/L Zinc above 15 mg/L. 9· At the end of the measurement the display will show the validation standard value. The reading should be within specifications as reported on the CAL CHECKTM Standard Certificate. If the value is found out of specifications, please check that the cuvettes are free of fingerprints, oil or dirt and repeat validation. If results are still found out of specifications then recalibrate the instrument. 9 11·Then the date of last calibration (e. g. : "01. 08. 2009") appears on the display, or "01. 01. 2009" if the factory calibration was selected before. In both cases the year number is blinking, ready for date input. 12·Press GLP/ to edit the desired year (2009-2099). If the key is kept pressed, the year number is automatically increased. 13·When the correct year has been set, press ZERO/CFM or READ/ /TIMER to confirm. Now the display will show the month blinking. Calibration 14·Press GLP/ to edit the desired month (01-12). If the key is kept pressed, the month number is automatically increased. [. . . ] For accurate validation and calibration results, please perform tests at room temperature (18 to 25°C; 64. 5 to 77. 0°F). Use the Hanna CAL CHECKTM cuvettes (see "Accessories") to validate or calibrate instruments. 16·Press GLP/ to edit the desired day (01-31). If the key is kept pressed, the day number is automatically increased. Note: It is possible to change the editing from day to year and to month by pressing READ/ /TIMER. [. . . ]