User manual HANNA INSTRUMENTS PH 210

[. . . ] HANNA LITERATURE Hanna publishes a wide range of catalogs and handbooks for an equally wide range of applications. The reference literature currently covers areas such as: Instruction Manual · Water Treatment · Process · Swimming Pools · Agriculture · Food · Laboratory · Thermometry and many others. For these and other catalogs, handbooks and leaflets, contact your dealer or the Hanna Customer Service Center nearest to you. To find the Hanna Office in your vicinity, check our home page at www. hannainst. com. pH 210 pH 212 pH 211 pH 213 Microprocessor-based Bench pH/mV/°C Meters MANPH213R2 02/00 http://www. hannainst. com Manufacturers since 1978 These Instruments are in Compliance with the CE Directives Dear Customer, Thank you for choosing a Hanna Product. [. . . ] In addition, the response time will suffer to a greater degree at temperatures below 10 C. 2x109 -10 1x109 -10 -10 2x108 1x108 -10 RESET The RESET button (#14 on page 4;#15 on page 6) should only be used when the instrument displays erroneous messages due to strong electrical interference or when the instrument's power supply was disconnected before the meter was switched off. After pressing RESET always recalibrate the unit before proceeding. p H CALIBRATION Calibrate the instrument often, especially if high accuracy is required. The instrument should be recalibrated : a) Whenever the pH electrode is replaced. e) If higher accuracy is required. 2x107 -10 1x107 -10 -2-20 --20 0 0+10+20 +30+40+50 +60 +70 +80 +90 ° CC 0 10 +10 +20+30+40 +50+60+70 +80+90 Since the resistance of the pH electrode is in the range of 200 Mohm, the current across the membrane is in the pico Ampere range. Large currents can disturb the calibration of the electrode for many hours. For these reasons high humidity environments, short circuits and static discharges are detrimental to a stable pH reading. If constantly used at high temperatures, the electrode life is drastically reduced. Typical Electrode Life Ambient Temperature 90 °C 1- 3 years Less than 4 months PREPARATION Pour small quantities of the buffer solutions into clean beakers. For accurate calibration and to minimize cross contamination, use two HI 70 04 HI 7004 HI 7007 120°C Less than 1 month High concentrations of sodium ions interfere with readings in alkaline solutions; the pH at which the interference starts to be significant depends upon the composition of the glass. This interference is the alkaline error and causes the pH to be underestimated. Alkaline Error Sodium Ion Correction for the Glass at 20-25°C Concentration pH Error 13. 00 0. 10 0. 1 Mol L-1 Na+ 13. 50 0. 14 14. 00 0. 20 12. 50 0. 10 13. 00 0. 18 1. 0 Mol L-1 Na+ 13. 50 0. 29 14. 00 0. 40 22 beakers for each buffer solution. One for RINSE CALIBRATION rinsing the electrode and the second for calibration. HI 7007 HI 7007 If you are measuring in the acid range, use pH 4. 01 as second buffer; if you are measuring in the alkaline range, use pH 10. 01 or pH 9. 18 as second buffer. PROCEDURE Calibration has a choice of 5 memorized buffers: pH 4. 01, 6. 86, 7. 01, 9. 18 and 10. 01. The pH meters however also provide for one-point calibration, as described below. 11 One-point calibration · Immerse the pH electrode and the temperature probe approximately 4 cm (1½") into a buffer solution of your choice (pH 4. 01, 6. 86, 7. 01, 9. 18 or 10. 01) and stir gently. The temperature probe should be close to the pH electrode. CLEANING PROCEDURE Soak in Hanna HI 7061 or HI 8061 General Cleaning Solution for approximately ½ hour. Removal of films, dirt or deposits on the membrane/junction: - Protein Soak in Hanna HI 7073 or HI 8073 Protein Cleaning Solution for 15 minutes. - Inorganic Soak in Hanna HI 7074 or HI 8074 Inorganic Cleaning Solution for 15 minutes. - Oil/grease Rinse with Hanna HI 7077 or HI 8077 Oil and Fat Cleaning Solution. 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 or HI 80300 Storage Solution for at least 1 hour before taking measurements. TROUBLESHOOTING Evaluate your electrode performance based on the following. · Noise (Readings fluctuate up and down) could be due to: ­ Clogged/Dirty Junction: Refer to the Cleaning Procedure above. ­ Loss of shielding due to low electrolyte level (in refillable electrodes only): refill with fresh HI 7071 or HI 8071 for single junction or HI 7082 or HI 8082 for double junction electrodes. [. . . ] The "CAL" indicator will come on and the primary LCD will show 380. 0 mV. · Set 380. 0 mV on the simulator. For instance, if the buffer temperature is 25 C, the display will show pH 4. 01 or 7. 01 or 10. 01. If the buffer temperature is 20 C, it will show pH 4. 00/7. 03/10. 06 or at 50 C, the display will show pH 4. 06/ 6. 98/9. 82. · Wait for 3 sec. It is now possible to proceed with the temperature calibration, if necessary, as described above, or return to normal operation by pressing CAL. 15 18 INTERFACE WITH PC (pH (p H 212 AND p H 213 ONLY) Data transmission from the instrument to the PC is now much easier with the new HI 92000 Windows® compatible application software (optional). [. . . ]