User manual HANNA INSTRUMENTS HI 8424NEW

[. . . ] SALES & TECHNICAL SERVICE CONTACTS Australia: Tel. (03) 9769. 0666 · Fax (03) 9769. 0699 Instruction Manual China: Tel. (10) 88570068 · Fax (10) 88570060 HI 8424NEW Portable pH/mV/°C Meter with Automatic Calibration and Battery Recharging System Egypt: Tel. & Fax (02) 2758. 683 Germany: Tel. [. . . ] · To enter the "mV" mode turn the instrument ON and press the RANGE key until the display changes to mV. · Submerge the ORP electrode tip (at least 4 cm / 1½") into the sample to be tested and allow time for the reading to stabilize (hourglass symbol turns off). · Measurements within the ±699. 9 mV range are displayed with 0. 1 mV resolution, while outside this range the resolution is 1 mV. FC 210 120 mm 4. 7" 22 7 Notes: · To perform correct ORP measurements, the surface of the ORP electrode must be clean and smooth. · When not in use, the tip of the electrode should be kept moist (use HI 70300 storage solution) and safe from any mechanical stress which might cause damage to the glass/platinum junction. TEMPERATURE MEASUREMENTS · Turn the instrument ON and press the RANGE key to select the temperature mode. · Make sure the temperature probe is connected to the meter. · Dip the temperature probe into the sample, allow the reading to stabilize (hourglass symbol turns off) and read the temperature value. · Temperature measurements can be displayed in °C or °F units (see "Menu selection" for details). HI 1083B Glass body, micro, Viscolene, non-refillable, combination pH electrode. Use: biotechnology, micro titration. 12 mm 0. 5" 5 mm 0. 2" 3 mm 0. 12" 3. 0 mm DIA 0. 12" HI 1083 120 mm 4. 7" HI 1131B / HI 1111S Glass body, single junction, refillable, combination pH electrode. Use: general purpose. 9. 5mm DIA 0. 37" 12 mm 0. 5" HI 1131 120 mm 4. 7" "S" VERSION Notes: · A blinking full scale value means that the reading is out of range. · To freeze a reading on display while in measurement mode, press the HOLD key. The pH, mV and temperature values are held, and the RANGE key can be used to view the values. Press HOLD again to return to normal mode. · If enabled, keypresses are followed with an acoustic signal. A lower note indicates that the key is not currently active. · To save battery life, the meter is provided with an auto-off feature, which turns the instrument off after 20 minutes of non-use. This feature can be disabled by the user (see "Menu selection" for details). HI 1230B / HI 1210S Plastic body, double junction, gel-filled, combination pH electrode. Use: general purpose. 12 mm 0. 5" HI 1230 120 mm 4. 7" "S" VERSION HI 1330B / HI 1310S Glass body, semimicro, single junction, refillable, combination pH electrode. Use: laboratory. 5mm DIA 0. 2" 5mm 0. 2" HI 1330 120 mm 4. 7" "S" VERSION HI 1331B / HI 1311S Glass body, semimicro, single junction, refillable, combination pH electrode. Use: flasks. 8 mm 0. 3" 7. 5mm DIA 0. 29" HI 1331 210 mm 8. 25" "S" VERSION 8 21 HI 7082 HI 8082 HI 8093 3. 5 M KCl electrolyte solution, 4 x 30 mL bottle, for double junction electrodes 3. 5 M KCl electrolyte solution, 4 x 30 mL FDA bottle, for double junction electrodes 1 M KCl+AgCl electrolyte solution, 4 x 30 mL FDA bottle, for double junction electrodes p H CALIBRATION For better accuracy, frequent calibration of the instrument is recommended. The instrument should be recalibrated for pH: a) Whenever the pH electrode or temperature probe is replaced b) At least once a week c) After testing aggressive chemicals d) When extreme accuracy is required PREPARATION Pour small quantities of pH 7. 01 (HI 7007) and pH 4. 01 (HI 7004) or pH 10. 01 (HI 7010) buffer solutions into two clean beakers. For accurate calibration use two beakers for each buffer solution, one for rinsing the electrode tip, and one for calibration. [. . . ] 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. [. . . ]