User manual HANNA INSTRUMENTS HI 991300

[. . . ] Battery replacement The meter displays the remaining battery percentage every time it is turned on. When the battery level is below 5%, the -+ symbol on the bottom left of the LCD lights up to indicate a low battery condition. If the battery level is so low as to cause erroneous reading, the Battery Error Prevention System (BEPS) will automatically turn the meter off. [. . . ] To freeze the display Press and hold the SET/HOLD button until HOLD appears on the secondary display. To turn the meter off Press and hold the ON/OFF/MODE button while in normal measurement mode. Release the button. HI 991300 is in compliance with the CE directives. IS991300R3 11/00 w w w . h a n n a i n s t . c o m pH MEASUREMENTS & CALIBRATION · Before taking any measurement make sure the meter has been calibrated. · If the probe has been left dry, soak in a storage or pH 7 solution at least for one hour to reactivate it. · Submerge the probe in the sample to be tested while stirring it gently. Wait until the stability symbol on the top left of the LCD disappears. · The pH value automatically compensated for temperature is shown on the primary LCD while the secondary LCD shows the temperature of the sample. · If measurements are taken in different samples successively, rinse the probe tip thoroughly to eliminate crosscontamination; and after cleaning, rinse the probe tip with some of the sample to be measured. Calibration buffer set · While in pH measurement mode, press and hold the MODE button until TEMP and the current temperature unit are displayed on the lower LCD. · Press the MODE button again to show the current buffer set: pH 7. 01 BUFF (for 4. 01/7. 01/10. 01) or pH 6. 86 BUFF (for 4. 01/6. 86/9. 18). · Press the MODE button to return to normal pH measurement mode. pH calibration · While in pH measurement mode, press and hold the MODE button until CAL is displayed on the lower LCD. The LCD will display pH 7. 01 USE or pH 6. 86 USE (if you have selected the NIST buffer set). · For a single point pH calibration, place the probe in any buffer from the selected buffer set (eg. If using pH 7. 01 (or 6. 86 from the NIST buffer set), after recognition of the buffer press the MODE button to return to the pH measurement mode. · For a two point pH calibration, place the probe in pH 7. 01 (or 6. 86, if you have selected the NIST buffer set). The meter will recognize the buffer value and then display pH 4. 01 USE. Stabilty indicator Battery percentage Low battery indicator AT C Place the probe in the second buffer (pH 4. 01 or 10. 01, or, if using NIST, pH 4. 01 or 9. 18). [. . . ] · Release the button and immerse the probe in HI7031 calibration solution (µS 1413 USE). · Once the calibration has been automatically performed, the LCD will display OK for 1 second and return to normal measurement mode. · Since there is a known relationship between the EC and TDS reading, it is not necessary to calibrate the meter in TDS. [. . . ]