User manual HANNA INSTRUMENTS HI 96735

[. . . ] INSTRUCTION MANUAL HI 96735 Hardness ISM 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. Please read it carefully before using the meter. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. Functional description: Errors and warnings: ON ZERO READING: Light High: There is too much light to perform a measurement. [. . . ] 5· Place the cuvette into the cuvette holder and ensure that the notch on the cap is positioned securely into the groove. 6· Press ZERO/TIMER/CFM and the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. 7· After a few seconds the display will show "-0. 0-". The meter is now zeroed and ready for measurement. 8· Add the content of 1 packet of HI 93735C fixing reagent. Replace the cap and shake gently to mix. 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 ZERO/TIMER/CFM for three seconds and the display will show the countdown prior to measurement or alternatively wait for 2 minutes and press READ/ /UNIT. In all cases the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. 12·At the end of measurement, the instrument directly displays the hardness in the last unit selected on the LCD. Press the READ/ /UNIT key repeatedly to change the reading unit: mg/L, °f, °C 12 and °E respectively. The conversion factors are as follows: 1 mg/L = 0. 1 °f = 0. 0556 °D = 0. 07 °E INTERFERENCES: Interference may be caused by excessive amounts of heavy metals. Note: If the sample is very acidic, some extra drops of HI 93735B 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 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 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 Validation 3· Place the CAL CHECKTM Standard HI 96735-11 Cuvette A into the holder 4-5 and ensure that the notch on the cap is positioned securely into the groove. 4· Press ZERO/TIMER/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-". [. . . ] Now the display will show the day blinking. 16·Press RANGE/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/ /UNIT. [. . . ]