User manual HANNA INSTRUMENTS HI 84429

[. . . ] Instruction Manual TITRATABLE ACIDITY MINITITRATOR & pH METER for Dairy Products HI 84429 w w w. c o m 1 Dear Customer, Thank you for choosing a Hanna product. This manual will provide you with the necessary information for the correct use of the instrument. Please read it carefully before using the meter. [. . . ] · The Clear key is displayed only if a previous calibration exists. pH BUFFER TEMPERATURE DEPENDENCE The temperature has an effect on pH. The calibration buffer solutions are affected by temperature changes to a lesser degree than normal solutions. During calibration the instrument will automatically calibrate to the pH value corresponding to the measured or set temperature. TEMP ºC 0 5 10 15 20 25 30 35 40 ºF 32 41 50 59 68 77 86 95 104 4. 01 4. 01 4. 00 4. 00 4. 00 4. 00 4. 01 4. 02 4. 03 4. 04 pH BUFFERS 6. 00 6. 12 6. 09 6. 06 6. 04 6. 02 6. 00 5. 99 5. 98 5. 97 8. 30 8. 48 8. 44 8. 41 8. 37 8. 33 8. 30 8. 27 8. 24 8. 21 During calibration the instrument will display the pH buffer value at 25 ºC. 23 PUMP TUBE INSTALLATION To mount the new peristaltic pump tube follow next steps: · Position one peristaltic pump fixing ring on its location. · Stretch the tube over the peristaltic pump cylinders. · Fix the second pump fixing ring on its location. · Attach the tube to the reagent bottle and to the dosing tip. Note: Purge the peristaltic pump until drops of reagent appears on the dosing tip by pressing the Purge key from the titrator main screen. To remove the tube of the peristaltic pump follow next steps: Caution: Purge line with water to remove NaOH from tube. · Detach the old tube system from the reagent bottle and from the dosing tip. · Grasp one fixing ring of the peristaltic pump tube. · Pull the tube until the fixing rings are taken out from their location. · Remove the other side of the tube. PURGE Purging should be performed whenever the tube of the peristaltic pump is replaced or before starting a pump calibration or a titration. In order to start purging press the Purge key from the titrator main screen. The purging stops automatically after 5 minutes. To access the Purge key follow the next steps. · From the instrument main screen (pH meter screen) press Titrator function key. The instrument will display the next screen if any of the following conditions exist: - the meter hasn't been calibrated in 8. 30 pH buffer - the pH calibration has expired - a pump calibration hasn't been performed or more than 3 days have passed since the last pump calibration 24 Press CAL to access the titration calibration menu where electrode and pump calibration may be accessed. · Press Continue or ESC to skip the message and enter Titrator main screen. · Press Purge to begin a purge cycle. The purging stops automatically after 5 minutes. To stop purging at any time and return to the main screen press ESC or Stop. During a purge, the remaining time until the purge process will be completed is shown on the lower right side of the display. [. . . ] 41 REFERENCE ELECTRODE CLEANING · Drain the old filling solution, rinse with an adequate HI 7072 solution, drain, then refill with HI 7072 solution. · Do not use an electrode if crystalized salts are visible inside the electrode. Drain electrode, dissasamble and rinse internal body with deionized water. Reassemble and refill with fresh fill solution. [. . . ]