User manual HANNA INSTRUMENTS HI 9812-0

[. . . ] This warranty is limited to repair or replacement free of charge. Damages due to accidents, misuse, tampering or lack of prescribed maintenance are not covered. If service is required, contact the dealer from whom you purchased the instrument. If under warranty, report the model number, date of purchase, serial number and the nature of the failure. [. . . ] After cleaning, it is recommended to rinse the probe with some of the next sample to be measured. TAKING TEMPERATURE MEASUREMENTS (for HI 9812-5 only) · Submerge the tip (4cm/1½") of the probe into the sample to be tested. · Stir briefly and wait a couple of minutes for the reading to adjust and stabilize. The display shows the temperature value. TAKING EC/TDS MEASUREMENTS · Immerse the tip of the probe (4cm/1½") into the sample to be tested. If possible, use plastic beakers or containers to minimize any EMC interference. · Tap the probe lightly on the bottom of the beaker to remove any air bubbles which may be trapped inside the tip. 6 Note: If the display shows only a "1" on the far left hand side, the reading is out of range. Note: It is recommended to clean often the probe with HI 700661 Cleaning Solution. Note: After measurements have been completed, the instrument should be switched off, and the probe cleaned and covered with the protective cap. 7 pH CALIBRATION For greatest accuracy, frequent calibration of the instrument is recommended. The instrument should be recalibrated for pH: a) Whenever the electrode is replaced. d) Where extreme accuracy is required. Note: The probe should be submerged approximately 4 cm (1½") into the solution. The ChecktempC thermometer has to be located close to the probe. Note: If turning the knob the needed value can not be reached, clean the probe (see the "Probe Maintenance" section). If also after the probe cleaning the value can not be reached, replace the probe. PREPARATION Pour small quantities of pH 7. 01 (HI 7007) or pH 4. 01 (HI 7004) or pH 10. 01 (HI 7010) solution into a clean beaker. To obtain accurate readings, use pH 7. 01 (HI 7007) if you are going to measure neutral or close to neutral samples, pH 4. 01 (HI 7004) if you are going to measure acidic samples or pH 10. 01 (HI 7010) for alkaline measurements. If you need to calibrate to NBS standards, use pH 6. 86 (HI 7006) instead of pH 7. 01 and pH 9. 18 (HI 7009) instead of pH 10. 01. pH VALUES AT VARIOUS TEMPERATURES For temperature compensation during calibration, please refer to the following chart. TEMP °C °F 32 0 41 5 50 10 59 15 20 68 77 25 86 30 95 35 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 9. 46 7. 13 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 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 PROCEDURE · Connect the probe and switch the meter on, then press the "pH" key to display pH measurement. · Remove the protective cap from the probe, rinse and immerse it in the buffer and stir gently. Wait a couple of minutes for the reading to stabilize. · Take the temperature of the buffer solution, e. g. 10. 0°C, as follow: for HI 9812-0, with a ChecktempC (or another accurate thermometer); for HI 9812-5, select the °C mode and read the displayed value. · Adjust the pH calibration knob until the LCD shows the pH value at the above temperature (see the pH versus temperature chart). For instance, if the buffer temperature is 25°C, the display should show pH 4. 0 or 7. 0 or 10. 0. If the buffer temperature is 10°C, the display should show pH 4. 0 or 7. 0 or 10. 1. · The pH calibration is now complete. 8 9 EC/TDS CALIBRATION Accessories needed: · Use HI 70031 (1413 µS/cm) EC calibration solution or HI 70032 (1382 ppm) TDS calibration solution. Note: The conversion between EC and TDS is made by a built-in circuit, hence it is requested to calibrate the meter only in EC or TDS range. [. . . ] (03) 3258. 9565 · Fax (03) 3258. 9567 Korea: Tel. (02) 2278. 5147 · Fax (02) 2264. 1729 Malaysia: Tel. (603) 5638. 9940 · Fax (603) 5638. 9829 Singapore: Tel. 6296. 7118 · Fax 6291. 6906 South Africa: Tel. [. . . ]