Tables are often used as a reference when adding sulphite
to wine. However, existing tables are static and may not meet
the preferences and precision desired by the winemaker. This
table generator allows the winemaker to enter his or her
preferences in order to generate a custom table. The table
can then be printed and used as a reference. The table values
are calculated using the same algorithm as Sulphite
Calculator.
Instructions
Setting Sulphite Data
Choose the sulphite source by selecting either
potassium metabisulphite or sodium metabisulphite from
the drop-down list. Most winemakers use potassium
metabisulphite for additions to wine, but sodium
metabisulphite is often used in sanitizing solutions.
If you are using campden tablets, check the
ingredients, then select the sulphite source from the
drop-down list.
Sulphite is available either in powder or tablet
form. In addition, many winemakers prepare a sulphite
solution by dissolving powder in water (see the resources section for
information regarding the preparation of sulphite
solutions). Click on the sulphite form that you are
using. If you are using a solution, you also need to
specify the strength of the solution as a percentage (1
to 100). A 10% solution is very common to use. If you
are using tablets, you need to specify the tablet
weight in grams. This weight should be printed on the
package.
Setting Batch Data
Set your batch size and specify the measurement
units. You can choose either, U.S. gallons, imperial
gallons, or litres as measurement units.
Setting Table Data
This feature allows you to define the table
structure. The starting and ending values can be
defined. The increment determines the number of rows to
generate. For example, setting the start value to 0,
the end value to 50, and the increment to 5, will
generate 11 rows (0,5,10,15...50).
Generate the Table
Click the Generate Table button and the table will
be displayed. It might take a few seconds for the table
to generate.
The table will show how much sulphite needs to be
added in order to reach a given free SO2 level. For
example, if your wine contains 30 mg/L of SO2 and you
wish to raise the level to 50 mg/L, your SO2
requirement is 20 mg/L (50-30). Look up 20 in the SO2
Requirement column of the table and read across to see
how much sulphite is required. If sulphite powder was
chosen as an option, the amounts will be shown in both
g and tsp. If a solution was chosen, then
the amounts will be shown in both ml and
tsp. If tablets was chosen, the amounts will be
shown as number of tablets. In the previous example, it
will require 0.66 g or 0.11 tsp to raise
the SO2 level from 30 mg/L to 50 mg/L. This example
assumes that potassium metabisulphite was used in
powder form and added to a 5 U.S. gallon batch.