User manual HANNA INSTRUMENTS HI 931000

[. . . ] Instruction Manual HI 8014 · HI 8915 HI 931000 Portable pH Meters www. hannainst. com 1 Dear Customer, Thank you for choosing a Hanna product. Please read this instruction manual carefully before using the meter. This manual will provide you with the necessary information for a correct use of the instrument. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] The temperature probe should be located as close as possible to the pH electrode. · Press °C to display the temperature of the buffer (e. g. 20. 0°C). °C ºC PROCEDURE FOR HI 931000 · Turn the meter on. Note: The "" indicator blinks when the reading is not stable. · Press CAL and the display will flash "7. 01 ". CAL pH · Press the pH key to read pH values. Stir gently and wait for a couple of minutes. · Adjust the OFFSET trimmer on the front panel until LCD shows the pH value at the noted temperature (see the pH vs. temperature chart on page 18). pH · Remove the electrode protective cap, rinse the electrode tip with some pH 7. 01 solution, then immerse the pH electrode and temperature probe in a pH 7. 01 buffer solution. · Stir gently and wait a couple of minutes for thermal equilibrium. Note: The electrode should be submerged approximately 4 cm (1½") in the solution. · When electrode has stabilized, the "" indicator stops flashing. Press CFM to confirm the first buffer solution. 4 cm (1½") OFFSE T CFM · Rinse and immerse pH electrode and temperature probe in pH 4. 01 or pH 10. 01 buffer (2nd calibration point); stir gently. HI 7004 · Wait a couple of minutes and adjust the SLOPE trimmer on the front panel until the LCD shows the pH value at the noted temperature. pH SLOPE · To quit the calibration mode and save a one-point (offset) procedure, press the ON/OFF key. For best accuracy, however, it is recommended to perform a two-point calibration. · The LCD will now blink "4. 01 ". pH 10. 01 can be selected by pressing the CAL key. · Rinse the electrode with the second buffer solution (pH 4. 01 or pH 10. 01). · Dip the electrode into the buffer solution, stir gently and wait until the instability indicator "" stops flashing. Press CFM to confirm the second buffer solution. The pH calibration is now complete. CFM The meter is now calibrated and will return to operational mode. 16 17 pH VALUES AT VARIOUS TEMPERATURES For manual temperature compensation during calibration, please refer to the following chart. TEMP °C °F 32 0 41 5 50 10 59 15 68 20 77 25 86 30 95 35 40 104 45 113 50 122 55 131 60 140 65 149 70 158 pH VALUES 7. 01 9. 18 7. 13 9. 46 9. 39 7. 10 9. 33 7. 07 9. 27 7. 04 9. 22 7. 03 9. 18 7. 01 9. 14 7. 00 9. 10 6. 99 9. 07 6. 98 9. 04 6. 98 9. 01 6. 98 8. 99 6. 98 8. 97 6. 98 8. 95 6. 99 8. 93 6. 99 TEMPERATURE CALIBRATION HI 8915 and HI 931000 have been accurately precalibrated for temperature at the factory. For optimum accuracy, it is recommended that you have your pH meter recalibrated for temperature at least once a year. Contact your Dealer or the nearest Hanna Customer Service Center for more information. 4. 01 4. 01 4. 00 4. 00 4. 00 4. 00 4. 01 4. 02 4. 03 4. 04 4. 05 4. 06 4. 07 4. 09 4. 11 4. 12 6. 86 6. 98 6. 95 6. 92 6. 90 6. 88 6. 86 6. 85 6. 84 6. 84 6. 83 6. 83 6. 84 6. 84 6. 85 6. 85 10. 01 10. 32 10. 24 10. 18 10. 12 10. 06 10. 01 9. 96 9. 92 9. 88 9. 85 9. 82 9. 79 9. 77 9. 76 9. 75 mV OUTPUT It is possible to attach the HI 8915 to a recorder or plotter using the mV output sockets. pH, mV and °C readings can be transmitted through the output sockets at a voltage that proportionally matches the displayed value. [. . . ] Operation of these instruments in residential areas could cause unacceptable interferences to radio and TV equipment. The glass bulb at the end of the electrode is sensitive to electrostatic discharges. Avoid touching this glass bulb at all times. During operation, ESD wrist straps should be worn to avoid possible damage to the electrode by electrostatic discharges. [. . . ]