User manual HANNA INSTRUMENTS HI 96739

[. . . ] Follow the instructions of the measurement procedure for zeroing the meter. 4 Under range: A blinking "0. 0" 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 chronometer appears when the reaction timer is running 7. The month, day and date icons appear when a date is displayed 8. Four digit secondary display Standard High: The standard reading is higher than expected. 10 11 OTHER ERRORS AND WARNINGS: Cap error: Appears when external light enters in the analysis cell. 12 Note: With wastewater and seawater samples, before performing any measurement a distillation of the sample is needed. INTERFERENCES: Negative interferences may be caused by: Alkalinity (as CaCO3) above 5000 mg/L Aluminum above 0. 1 mg/L Iron, ferric above 10 mg/L Positive interferences may be caused by: Chloride above 700 mg/L Phosphate, ortho above 16 mg/L Sodium hexametaphosphate above 1. 0 mg/L Sulfate above 200 mg/L Highly colored and turbid samples may require distillation Highly alkaline samples can be neutralized with nitric acid. 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 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 3 VALIDATION 1· Turn the meter on by pressing ON/OFF. 2· When the beeper sounds briefly and the LCD displays dashes, the meter is ready. 3· Place the CAL CHECKTM Standard 4-5 HI 96739-11 Cuvette A into the holder and ensure that the notch on the cap is positioned securely into the 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-". The meter is now zeroed and ready for validation. 7· Place the CAL CHECKTM Standard HI 96739-11 Cuvette B into the holder and 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. 7 8 Calibration Note: It is possible to interrupt the calibration procedure at any time by pressing CAL CHECK or ON/OFF keys. 3 1· Turn the meter on by pressing ON/OFF. 2· When the beeper sounds briefly and the LCD displays dashes, the meter is ready. 3· Press and hold CAL CHECK for three seconds to enter calibration mode. The display will show "CAL" during calibration procedure. [. . . ] To restart the instrument, the battery must be replaced with a fresh one. To replace the instrument's battery, follow the steps: · Turn the instrument off by pressing ON/OFF. · Turn the instrument upside down and remove the battery cover by turning it counterclockwise. Warranty HI 96739 is warranted for two years against defects in workmanship and materials when used for its intended purpose and maintained according to the instructions. This warranty is limited to repair or replacement free of charge. [. . . ]