User manual HANNA INSTRUMENTS HI 96741

[. . . ] READ/ /TIMER key: In measurement mode, press to make a measurement, or press and hold for three seconds to start a pre-programmed countdown prior to measurement. Cuvette holder ON SAMPLE READING: Inverted cuvettes: The sample and the zero cuvette are inverted. Follow the instructions of the measurement procedure for zeroing the meter. Under range: A blinking "0. 00" indicates that the sample absorbs less light than the zero reference. [. . . ] 8· Add the specific test reagent for each parameter: Total hardness: the third cuvette (nothing is added) Iron LR: Fill one graduated mixing cylinder up to the 25 mL mark with the sample. Add the content of one packet of HI 93746-0 reagent, close the cylinder and shake well for 30 seconds. Fill a cuvette with 10 mL of the reacted sample up to the mark and replace the cap. 10· Replace the cuvette into the holder and ensure that the notch on the cap is positioned securely into the groove. Alternatively, wait for: Iron LR: 30 seconds Then press READ/ /TIMER. For Hardness press READ/ /TIMER directly. In all cases the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. 12·The instrument directly displays the 12 concentration in mg/L of iron or for hardness the instrument will display the concentration of Calcium in mg/L CaCO3 on the LCD, depending on the selected parameter. INTERFERENCES: · Iron LR: Cadmium above 4. 0 mg/L, Chromium6+ above 1. 2 mg/L, Copper above 0. 6 mg/L, Manganese above 50. 0 mg/L, Molybdenum above 4. 0 mg/L, Nitrite ion above 0. 8 mg/L, Chromium3+ above 0. 25 mg/L, Cobalt above 0. 05 mg/L, Cyanide above 2. 8 mg/L, Mercury above 0. 4 mg/L, Nickel above 1. 0 mg/L. Sample pH should be between 3 and 4 to avoid developed color to fade or turbidity formation. Note: If the sample is very acidic, some extra drops of HI 93719B buffer reagent may be added. 8· Press CAL CHECK key and the lamp, cuvette and detector icons together with "CAL CHECK" will appear on the display, depending on the measurement phase. 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. 8 9 CALIBRATION Validation and Calibration procedures Warning: do not validate or calibrate the instrument with standard solutions other than the Hanna CAL CHECKTM Standards, otherwise erroneous results will be obtained. 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. VALIDATION Validation Note: The validation is performed only for the selected parameter. For full validation of the instrument, the following procedure must be performed for each parameter. 2· When the beeper sounds briefly and the LCD displays dashes, the meter is ready. 3· Place the CAL CHECKTM Standard Cuvette A into the cuvette holder and ensure that the notch on the cap is positioned securely into the 4-5 groove. 4· Press ZERO/CFM and the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. 5· After a few seconds the display will show "-0. 0-". [. . . ] Any variation introduced by the user to the supplied equipment may degrade the instrument's EMC performance. To avoid damages or burns, do not put the instrument in microwave oven. For yours and the instrument safety do not use or store the instrument in hazardous environments. GLP In GLP mode, the last calibration date can be verified and the factory calibration can be restored. Last Calibration Date LAST CALIBRATION DATE 1· Press and hold RANGE/GLP/ for three seconds to enter GLP mode. [. . . ]