User manual HANNA INSTRUMENTS HI 84100

[. . . ] SALES AND TECHNICAL SERVICE CONTACTS Australia: Tel. (03) 9769. 0666 · Fax (03) 9769. 0699 Instruction Manual China: Tel. (10) 88570068 · Fax (10) 88570060 Egypt: Tel. & Fax (02) 2758. 683 Germany: Tel. [. . . ] What is really protecting your wine is molecular SO2. When you add SO2, depending of circumstances, some of it immediately becomes bound. The relationship between the amount of added SO2 and the amount of SO2 remaining free is complex. It is clear, however, that it is largely governed by the total SO2 content of the wine. The rate of binding decreases as the free SO2 concentration increases. The exact relationship between free and bound (total - free) SO2 will vary from wine to wine. Below 30-60 ppm, 33% to 50% of SO2 addition becomes bounded. What remains is called "free" and it is divided in two parts. The larger, and relatively ineffective free part is "bisulphite" (HSO3-). The smaller part of the free is the active molecular SO2. The amount of molecular SO2 in your wine depends both on the level of free SO2 present as well as pH. For instance, at pH 3. 2, the amount of free SO2 for 0. 8 ppm molecular SO2 is 22 ppm. At pH 3. 5, you will need 43 ppm free - essentially double. Free SO2 concentration (ppm) for 0. 8 ppm molecular SO2: pH Free SO2 3. 0 14 3. 1 18 3. 2 22 3. 3 28 3. 4 35 3. 5 44 3. 6 55 3. 7 69 3. 8 87 3. 9 109 For faster response, unscrew the fill hole screw during measurements. STORAGE PROCEDURE To minimize clogging and assure a quick response time, the glass bulb and the junction of the electrode should be kept moist and not allowed to dry out. Replace the solution in the protective cap with a few drops of HI 70300 Storage Solution or, in its absence, Filling Solution (HI 7082). Follow the Preparation Procedure before taking measurements. Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER. PERIODIC MAINTENANCE Inspect the electrode and the cable. The cable used for connection to the instrument must be intact and there must be no points of broken insulation on the cable or cracks on the electrode stem or bulb. Connectors must be perfectly clean and dry. If any scratches or cracks are present, replace the electrode. [. . . ] Analyze the wine immediately after the sample is obtained. Clean the electrode with the HI 700635 or HI 700636 cleaning solution, specially made for wine industry, if it was unused for a long time. START UP · Place the instrument on a flat table. Do not place the instrument on direct sun light. · Connect the titrator to mains socket with ground connection and the correct voltage and frequency. [. . . ]