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Manual abstract: user guide HANNA INSTRUMENTS HI 9026
Detailed instructions for use are in the User's Guide.
[. . . ] SALES AND TECHNICAL SERVICE CONTACTS
Tel. (07851) 9129-0 Fax (07851) 9129-99 Tel. (603) 5638. 9940 Fax (603) 5638. 9829 Tel. 886. 2. 2739. 3014 Fax 886. 2. 2739. 2983 Tel. [. . . ] Check tha t b uffer solution is correct a nd fresh. Cha ng e b a tteries; Press ON/OFF.
Clogged/dirty junction. L ow electrolyte level (refilla b le electrod es only). Rea d ing out of ra ng e.
D isp la y shows b linking full sca le va lue. D isp la y shows b linking °C or °F. D isp la y shows CL E AN b linking .
D ry memb ra ne or d ry junction. D ifference b etween new a nd p revious ca lib ra tion ha s b een d etected . D ead batteries; Auto-off feature is enabled: in this case, meter shuts off after 20 min of non-use. L oa d ed d efa ult p H ca lib ra tion va lues.
D isp la y shows b linking b a ttery symb ol. Meter d oes not work with temp era ture p rob e. Meter fa ils to ca lib ra te or g ives fa ulty rea d ing s. WRONG CAL is d isp la yed d uring p H ca lib ra tion p roced ure. Meter shuts off.
It is recommended to calibrate the instrument frequently, especially if high accuracy is required. The pH range should be recalibrated: a) Whenever the pH electrode is replaced. e) When the calibration time-out is expired (if feature is enabled). PROCEDURE The meter offers a choice of 7 memorized buffers (1. 68, 4. 01, 6. 86, 7. 01, 9. 18, 10. 01 and 12. 45 pH) and also allows the user to enter two more pH values for calibration, C1 and C2 (see Custom Buffer Selection section on page 12 for details). Pour small quantities of selected buffer solutions into clean beakers. For accurate calibration use two beakers for each buffer solution, the first one for rinsing the electrode and the second one for calibration. Remove the protective cap and rinse the electrode with some of the buffer solution to be used for the first calibration point. TWO-POINT CALIBRATION Press the CAL key. The "CAL" and " " indicators will be displayed. The secondary LCD will display buffer "7. 01". [. . . ] WRONG and WRONG blinking alternatively: wrong buffer, value not recognized. CLEAN blinking: an abnormal difference between new and previous calibration has been detected. Follow the cleaning procedure described in the Electrode conditioning & maintenance section. If the problem remains, check the buffer solutions.
During calibration the instrument will display the pH buffer value at 25 °C. [. . . ]
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