User manual HANNA INSTRUMENTS HI 96745

[. . . ] 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. 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. [. . . ] The meter is now zeroed and ready for measurement (except for Hardness). 8· Add the specific test reagent for each parameter: pH: 5 drops of HI 93710-0 Free Chlorine: 1 packet of HI 93701-0 Total Chlorine: 1 packet of HI 93711-0 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. 9· Replace the cap and swirl the solution: for pH invert several times to mix, for free and total chlorine shake gently 20 seconds. 10· Replace the cuvette into the holder and ensure that the notch on the cap is positioned securely into the groove. 11·Press and hold READ/ /TIMER for three seconds. The display will show the countdown prior to measurement (not for Hardness). Alternatively, wait for: Free Chlorine: 1 minute Total Chlorine: 2 minutes and 30 seconds Iron LR: 30 seconds Then press READ/ /TIMER. In all cases the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. 11 or 12·The instrument directly displays the pH 12 measured value or the concentration in mg/L of free chlorine, total chlorine or iron on the LCD, depending on the selected parameter. For Hardness the instrument will display the concentration of Calcium in mg/L CaCO3 (together with `'C''). Press READ/ / TIMER again, the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. The isntrument will display the total hardness concentration in mg/L CaCO3 (together with `'t''). Alkalinity above 250 mg/L CaCO3 or acidity above 150 mg/L CaCO3 will not reliably develop the full amount of color or it may rapidly fade. In case of water with hardness greater than 500 mg/L CaCO3, shake the sample for approximately 2 minutes after adding the powder reagent. · Iron LR: Cadmium above 4. 0 mg/L, Chromin6+ above 1. 2 mg/L, Copper above 0. 6 mg/L, Manganese above 50. 0 mg/L, Molybdenum 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. Note: If the sample is very acidic, some extra drops of HI 93735B buffer reagent may be added. 6· Remove the cuvette. 7· Place the specific CAL CHECKTM Standard Cuvette B into the cuvette holder, for: pH: B, HI 96710-11 Free Chlorine: B, HI 96701-11 Total Chlorine: B, HI 96711-11 Hardness: B, HI 96719-11 Iron LR: B, HI 96746-11 Ensure that the notch on the cap is positioned securely into the groove. 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. 7 8 9 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. [. . . ] 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. [. . . ]