User manual HANNA INSTRUMENTS PH211 R

[. . . ] Instruction Manual pH211R Microprocessor-based Bench pH/mV/°C Meter with Analog Output www. hannainst. com Dear Customer, Thank you for choosing a Hanna Instruments Product. Please read this instruction manual carefully before using the instrument. This manual will provide you with all the necessary information for correct use of the instrument, as well as a precise idea of its versatility in a wide range of applications. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] · If necessary, press v°C or w°C to select a different buffer value. · The "NOT READY" indication will blink on the LCD until the reading has stabilized. · When the reading is stable, "READY" and "CFM" will blink. Press CFM to confirm the calibration. Note: The meter will automatically skip the buffer used for the first point. It also skips pH 6. 86 if 7. 01 was used, and viceversa, and pH 9. 18 if 10. 01 was used, and viceversa. · The "NOT READY" indication will blink on LCD until the reading has stabilized. · When the reading is stable, "READY" and "CFM" will blink. Press CFM to confirm the calibration. · If the reading is close to the selected buffer value, the meter stores the calibration point. The "Stor" message appears on the LCD for 1 second, then the buffer value is displayed on the primary LCD and the secondary LCD displays the second expected buffer value. · If the measured value is not close to the selected buffer, the "WRONG " and "WRONG " symbols will blink alternately. In this case check if the correct buffer has been used or refresh the electrode by following the maintenance procedure (see "Electrode Maintenance" section). If necessary change the buffer or the electrode. 10 · If the reading is close to the selected buffer, the meter stores the calibration point, displays the "Stor" message for 1 second and returns to normal operational mode. · If the measured value is not close to the selected buffer, "WRONG " and "WRONG " will blink alternately. In this case check if the correct buffer has been used, or refresh the electrode by following the maintenance procedure (see "Electrode Maintenance" section). Note: Press RANGE to display the temperature reading on the LCD during calibration. 11 ELECTRODE CONDITIONING & MAINTENANCE Note: To prevent damage to the pH electrode, remove it from the solution before turning the meter off. With the meter OFF, detach the electrode from the instrument and immerse it in the storage solution. For refillable electrodes If the filling solution (electrolyte) is more than 2. 5 cm (1") below the fill hole, add HI 7082 3. 5M KCl electrolyte solution for double junction or HI 7071 3. 5M KCl+AgCl electrolyte solution for single junction electrodes. For a faster response, unscrew the fill hole screw during measurements. Removal of films, dirt or deposits on the membrane/junction: - Protein Soak in Hanna HI 7073 protein cleaning solution for 15 minutes. - Inorganic Soak in Hanna HI 7074 inorganic cleaning solution for 15 minutes. IMPORTANT: After performing any of the cleaning procedures rinse the electrode thoroughly with distilled water, refill the reference chamber with fresh electrolyte (not necessary for gel-filled electrodes) and soak the electrode in HI 70300 storage solution for at least 1 hour before taking measurements. TROUBLESHOOTING Evaluate the performance of your electrode based on the following. · Noise (readings fluctuate up and down) could be due to: ­ Clogged/Dirty Junction: refer to the Cleaning Procedure. ­ Loss of shielding due to low electrolyte level (in refillable electrodes only): refill with fresh HI 7071 for single junction or HI 7082 for double junction electrodes. [. . . ] Use: general purpose for food industry. 12 mm 0. 5" FC 100 120 mm 4. 7" HI 1413B Glass body, single junction, flat tip, Viscolene, non-refillable, combination pH electrode. Use: surface measurement. 12 mm 0. 5" HI 1413 110 mm 4. 3" FC 200B PVDF body, open junction, conic, Viscolene, non-refillable, combination pH electrode. Use: meat & cheese. 6 mm 0. 25" ORP ELECTRODES HI 3131B Glass body, refillable, combination platinum ORP electrode. Use: titration. 12 mm 0. 5" FC 200 75 mm 2. 95" HI 3131 150 mm 5. 9" FC 210B Glass body, double junction, conic, Viscolene, non-refillable, combination pH electrode. [. . . ]