User manual HANNA INSTRUMENTS HI 96735

[. . . ] RANGE/GLP/ key: press to change the range or press and hold for three seconds to enter GLP mode. CAL CHECK key: press to perform the validation of the meter, or press and hold for three seconds to enter calibration mode. ZERO/TIMER/CFM key: press to zero the meter prior to measurement, to confirm edited values or to confirm factory calibration restore. Press and hold for three seconds to start a preprogramed countdown prior to measurement. [. . . ] 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-". 7· Place the CAL CHECKTM Standard HI 96735-11 Cuvette B into the holder and ensure that the notch on the cap is positioned securely into the groove. Note: It is possible to interrupt the calibration procedure at any time by pressing CAL CHECK or ON/OFF keys. 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. 4· Place the CAL CHECKTM Standard HI 96735-11 Cuvette A into the cuvette holder and ensure that the notch on the cap 5-6 is positioned securely into the groove. 5· Press ZERO/TIMER/CFM and the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. 6· After a few seconds the display will show "-0. 0-". [. . . ] If under warranty, report the model number, date of purchase, serial number and the nature of the failure. If the repair is not covered by the warranty, you will be notified of the charges incurred. · Turn the instrument upside down and remove the battery cover by turning it counterclockwise. 16 17 18 GLP In GLP mode, the last calibration date can be verified and the factory calibration can be restored. Last Calibration LAST CALIBRATION DATE Date 1· Press and hold for three seconds 1 RANGE/GLP/ to enter GLP mode. [. . . ]