User manual HANNA INSTRUMENTS HI 84100

[. . . ] If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization Number from the Customer Service Department and then send it with shipment costs prepaid. When shipping any instrument, make sure it is properly packaged for complete protection. To validate your warranty, fill out and return the enclosed warranty card within 14 days from the date of purchase. TABLE OF CONTENTS PRELIMINARY EXAMINATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Any variation introduced by the user to the supplied equipment may degrade the instrument EMC performance. To avoid damages or burns, do not put the instrument in microwave ovens. For yours and the instrument safety do not use or store the instrument in hazardous environments. 18 SIGNIFICANCE OF USE An important reason for adding SO2 is to avoid oxidation. When there is oxygen around, SO2 itself becomes oxidized before phenol compounds in the wine , and so acts as an oxygen scavenger. Also SO2 suppresses the activity of enzymes that cause browning and other problems. 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. What remains is called "free" and it is divided in two parts. The larger, and relatively ineffective free part is "bisulphite" (HSO3-). 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. 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). 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. Probe Maintenance Refill the reference chamber with fresh electrolyte (HI 7082). CLEANING PROCEDURE · Wine deposits Soak in Hanna HI 70635 cleaning solution for 15 minutes · Wine stains Soak in Hanna HI 70636 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 and soak the electrode in HI 70300 Storage Solution for at least 1 hour before taking measurements. In most situations, 0. 8 ppm molecular SO2 during bulk storage and at bottling will provide you with adequate protection from oxidation and bacterial action. It is important to remember that the amount of free SO2 in the wine depends on three things: how much is added, how much was present before the addition and how much of your addition promptly becomes bound. [. . . ] · Fill the 50 mL beaker up to the 50 mL mark with the wine sample, place the stir bar into the beaker and put the beaker in the appropriate place on the minititrator top. · Fill the 20 mL beaker up to the 5 mL mark with the HI 84100-53 Acid Reagent and add the content to the 50 mL beaker. · Add the content of one powder packet of HI 84100-54 Stabilizer into the beaker. · Place the probe holder on the top of the beaker and secure it by turning clockwise. 12 9 GUIDE TO DISPLAY CODES This prompt appears for a few seconds each time the instrument is turned ON. This error message appears when the sample concentration exceeds 400 ppm. The used standard solution is wrong. This error message appears when the input readings (mV) exceed the input limits (0÷1000mV). Press the START STOP button in order to stop the titration and return to the main screen. [. . . ]