User manual HANNA INSTRUMENTS HI 83141V

[. . . ] Damages due to accident, 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. If the repair is not covered by the warranty, you will be notified of the charges incurred. [. . . ] The instrument should be recalibrated for pH whenever the pH electrode is replaced, where extreme accuracy is required, and at least once a month. · Pour small quantities of pH7. 01 (HI 5007) and pH3. 00 (HI 5003) buffer solutions into two clean beakers. For an accurate calibration use two beakers for each buffer solution, the first one for rinsing the tip of the electrode, the second one for calibration. If a calibration with NBS standards is needed, use pH6. 86 (HI 5068) instead of pH7. 01. · Connect pH electrode and temperature probe to the meter and switch it ON. · Remove the protective cap, rinse the tips of pH electrode and temperature probe with some pH7. 01 solution. Immerse them into pH7. 01 buffer solution, stir gently and wait a couple of minutes for stable reading. Note: The electrode should be submerged approximately 4 cm (1½") into the solution and the temperature probe should be located as close as possible to the electrode. · Press the °C key to display the temperature of the buffer (e. g. Then press the pH key to read pH values. Stir gently and wait for a couple of minutes. ºC pH VALUES AT VARIOUS TEMPERATURES TEMP °C 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 pH VALUES 7. 01 7. 13 7. 10 7. 07 7. 04 7. 03 7. 01 7. 00 6. 99 6. 98 6. 98 6. 98 6. 98 6. 98 6. 99 6. 99 pH ELECTRODE MAINTENANCE Preparation Remove the electrode protective cap. Do not be alarmed if any salt deposits are present: this is normal with electrodes and they will disappear when rinsed with water. During transport tiny bubbles of air may have formed inside the glass bulb. The electrode cannot function properly under these conditions. These bubbles can be removed by "shaking down" the electrode as you would do with a glass thermometer. Sensitive bulb To avoid clogging problems and ensure a fast response, the bulb must be kept moist at any time. Store the electrode with few drops of HI 70300 storage solution in the protective cap. NEVER USE DISTILLED OR DEIONIZED WATER FOR STORING PURPOSES. Periodic maintenance Inspect electrode and cable. The cable used for the connection to the meter must be intact and there must be no points of broken insulation. The connector must be perfectly clean and dry. If any scratches or cracks are present, replace the electrode. [. . . ] Note: If the temperature probe is not connected, the pH reading will be compensated at 25°C. To take ORP (mV) measurements connect an ORP electrode (optional) to the BNC connector on the top of the meter, submerge the tip (at least 4 cm/1½") into the solution, enter the "mV" mode by pressing the mV key and wait a few minutes for the reading to stabilize. 3. 00 3. 07 3. 05 3. 03 3. 02 3. 00 3. 00 3. 00 3. 00 2. 99 2. 99 2. 99 2. 99 2. 99 2. 99 3. 00 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 BATTERY REPLACEMENT When the battery becomes weak, the meter displays a blinking additional decimal point on the left side of the LCD. When the low battery indicator appears only a few hours of battery life is remaining. A low battery level may also result in unreliable measurements. [. . . ]