User manual HANNA INSTRUMENTS CHECKTEMP 3

[. . . ] Change the battery and restart the meter. Measurement procedure: Measurement Technical specifications: Range Resolution Accuracy Typical EMC Dev. Light Source Light Detector Method 0 to 100 mg/L 1 mg/L ±5 mg/L ±5% of reading@ 25°C ±1 mg/L Tungsten Lamp Silicon Photocell with narrow band interference filter @ 525 nm Adaptation of the cadmium reduction method. The reaction between nitrate-nitrogen and the reagent causes an amber tint in the sample. 0 to 50°C (32 to 122°F); max 95% RH non-condensing 1 x 9 volt After 10' of non-use in measurement mode; after 1 hour of non-use in calibration mode; with last reading reminder. [. . . ] 4· Place the cuvette into the cuvette 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· Replace the cap and immediately shake vigorously for exactly 10 seconds by moving the cuvette up and down. Continue to mix by inverting the cuvette gently and slowly for 50 seconds, while taking care not to induce air bubbles. 9· Replace the cuvette into the holder and ensure that the notch on the cap is positioned securely into the groove. 10·Press and hold READ/ /TIMER for three seconds and the display will show the countdown prior to measurement or alternatively wait for 4 minutes and 30 seconds and press READ/ /TIMER. In all cases the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. 11·At the end of measurement, the instrument directly displays concentration in mg/L of nitrate-nitrogen on the LCD. To convert the reading to mg/L of nitrate (NO3-), multiply by the factor 4. 43. INTERFERENCES: or Interference may be caused by: 11 Ammonia and amines, as urea and primary aliphatic amines. Note: To ensure accurate results, preform the tests at room temperature, between 18 °C and 28 °C (65 °F to 83 °F). Operation of these instruments may cause unacceptable interferences to other electronic equipments, this requiring the operator to take all necessary steps to correct interferences. 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. 14-15 or 4· The instrument briefly indicates "donE" upon restoration of factory calibration prior to returning to measurement mode. Battery management To save the battery, the instrument shuts down after 10 minutes of non-use in measurement mode and after 1 hour of non-use in calibration mode. 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. The instrument displays a battery indicator with three levels as follows: · 3 lines for 100 % capacity · 2 lines for 66 % capacity · 1 line for 33 % capacity · Battery icon blinking if the capacity is under 10 %. If the battery is empty and accurate measurements can't be taken any more, the instrument shows "dEAd bAtt" and turns off. To restart the instrument, the battery must be replaced with a fresh one. [. . . ] 6· After a few seconds the display will show "-0. 0-". 8· Place the CAL CHECKTM Standard CHECKTEMP 3-11 Cuvette B into the holder and ensure that the notch on the cap is positioned securely into the groove. 9· Press READ/ /TIMER and the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. 10·The instrument will show for three seconds the CAL CHECKTM standard value. [. . . ]