User manual HANNA INSTRUMENTS CHECKTEMP

[. . . ] Please check that the sample does not contain any debris. 2 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" 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. [. . . ] The code that appears on the secondary display is the one of the last selected parameter. The blinking "ZERO" indicates that the instrument needs to be zeroed first. 3· Calcium: Using a 5 mL syringe add exactly 3 mL of sample to the cuvette. Use the pipette to fill the cuvette up to the 10 mL mark with the HI 93752A-0 Ca Buffer Reagent. Magnesium: Using a 1 mL syringe add exactly 1 mL of HI 93752A-0 Mg Buffer Reagent. Use the pipette to fill the cuvette up to the 10 mL mark with the HI 93752B-0 Mg Indicator Reagent. 4· Place the cuvette into the holder and ensure that the notch on the cap is positioned securely into the groove. 5· Press ZERO/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-". 8· Calcium: Using a 1 mL syringe add exactly 1 mL of the HI 93752B-0 Ca Oxalate reagent. Magnesium: Using another 1 mL syringe, add to the cuvette exactly 0. 5 mL of sample. 6· Press ZERO/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-". 9· Place the specific CAL CHECKTM Standard Cuvette B into the cuvette holder, for: Calcium: B, CHECKTEMP-11 Magnesium: B, HI 96754-11 Ensure that the notch on the cap is positioned 10-11 securely into the groove. 10·Press READ/ /TIMER and the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. 11·The instrument will show for three seconds the CAL CHECKTM standard value. Note: If the display shows "STD HIGH", the 12-14 standard value was too high. If the display shows "STD LOW", the standard value was too low. Verify that both CAL CHECKTM Standard Cuvettes, A and B are free from fingerprints or dirt and that they are inserted correctly. 12·Then the date of last calibration (e. g. : or "01. 08. 2009") appears on the display, or "01. 01. 2009" if the factory calibration was selected before. If the key is kept pressed, the year number is automatically increased. 14·When the correct year has been set, press 15-16 ZERO/CFM or READ/ /TIMER to confirm. If the key is kept pressed, the month number is automatically increased. [. . . ] If a valid measurement was displayed before auto-shut off, the value is displayed when the instrument is switched on. The blinking "ZERO" means that a new zero has to be performed. One fresh battery lasts for arround 750 measurements, depending on the light level. The remaining battery capacity is evaluated at the instrument startup and after each measurement. [. . . ]