User manual HANNA INSTRUMENTS HI 9810

[. . . ] Instruction Manual HI 9810 Portable pH/EC/TDS Meter http://www. hannainst. com This Instrument is in Compliance with the CE Directives 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, as well as a precise idea of its versatility. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] The other range is thus automatically calibrated. PREPARATION Pour small quantities of pH 7. 01 (HI 7007 or HI 8007) or pH 4. 01 (HI 7004 or HI 8004) or pH 10. 01 (HI 7010 or HI 8010) solution into a clean beaker. To obtain accurate readings, use pH 7. 01 (HI 7007 or HI 8007) if you are going to measure neutral or close to neutral samples, pH 4. 01 ( H I 7004 or HI 8004) if you are going to measure acidic samples or pH 10. 01 (HI 7010 or HI 8010) for alkaline measurements. If you need to calibrate HI 9810 to NBS standards, use pH 6. 86 (HI 7006 or HI 8006) instead of pH 7. 01 and pH 9. 18 (HI 7009 or HI 8009) instead of pH 10. 01. PROCEDURE · Pour approximately 4 cm (1½") of a conductivity calibration solution (e. g. If possible, use plastic beakers to minimize any EMC interference. · Immerse the combined electrode in the solution. · Wait for a couple of minutes for thermal equilibrium to be reached. · Tap the combined electrode on the bottom, then shake it lightly while rotating to make sure no air bubbles remain trapped inside the probe. · Select the appropriate range, e. g. µS/cm. PROCEDURE · Switch the meter on after connecting the electrode and press pH to display pH measurement. · Remove the protective cap from the electrode, rinse and immerse it in the buffer and stir gently. Wait a couple of minutes for the reading to stabilize. · If the buffer solution is not at ambient temperature, take its temperature with a ChecktempC (or an accurate thermometer), e. g. Note: the electrode should be submerged approximately 4 cm (1½") into the solution. The ChecktempC should be located close to the electrode. · Adjust the pH calibration knob until the LCD shows the pH value at the above temperature (see the pH versus temperature chart on page 10). · The pH calibration is now complete. 8 · Turn the EC/TDS calibration knob until the display shows the EC or TDS reading at 25 C. 9 p H VALUES AT VARIOUS TEMPERATURES For temperature compensation during calibration, please refer to the following chart. TEMP °C °F 0 32 5 41 10 50 15 59 20 68 25 77 30 86 35 95 40 104 45 113 50 122 55 131 60 140 65 149 70 158 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 pH VALUES 7. 01 9. 18 7. 13 9. 46 7. 10 9. 39 7. 07 9. 33 7. 04 9. 27 7. 03 9. 22 7. 01 9. 18 7. 00 9. 14 6. 99 9. 10 6. 98 9. 07 6. 98 9. 04 6. 98 9. 01 6. 98 8. 99 6. 98 8. 97 6. 99 8. 95 6. 99 8. 93 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 TEMPERATURE COMPENSATION The conductivity of an aqueous solution is the measure of its ability to carry an electrical current by means of ionic motion. The conductivity invariably increases with increasing temperature. It is affected by the type and number of ions in the solution and by the viscosity of the solution itself. Both parameters are temperature dependent. The dependency of conductivity on temperature is expressed as a relative change per degree Celsius at a particular temperature, commonly as percent per C. For common ionic solution, this value is about 2%/ C. Acids, alkalis and concentrated salt solutions have somewhat lower value, typically 1. 5%/ C. [. . . ] You can also e-mail us at: tech@hannainst. com. 16 17 WARRANTY All Hanna Instruments meters are warranted for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. The electrodes and the probes are warranted for a period of six months. This warranty is limited to repair or replacement free of charge. Damages due to accident, misuse, tampering or lack of prescribed maintenance are not covered. [. . . ]