The following support article is to help you set up metric weightings for additions; this allows the additive calculator to work out how much of an additive is required to reach the desired metric level.
This is commonly used for KMBS or PMS, CUSO4 and a variety of other sulfur additions/solutions.
Access your Sandbox database to set this up and test it out before doing the same in your Production database.
This involves setting up the Metric and the Addition and then using the Addition calculator.
Setting up the Metric
Head into Winery setup > Production > Metrics.
In this example I am using Free SO2, the important thing on this form is the ppm to g/L factor.
If you know your ppm to g/L factor you can enter it here, otherwise 0.001 will generally do.
Once this is entered, Save.
Setting up the addition
Head into the Additive category and select the Addition you want to tie to the metric.
In the following example, KMBS is the additive and Free SO2 is the metric.
The right hand side is where you select a metric and assign a weighting to it; this weighting is the percentage of this addition that will contribute to the metric.
Clicking the Add button on the center box will add it to the metric weighting list.
In this case 57% of the PMS addition will contribute to the Free SO2 metric.
Finally the Rate unit field is important as the rate of addition will be set to PPM.
In theory everything is ready to be used now, so next is using the addition calculator.
Using the Additive calculator
Exit the winery setup and head into the operations menu, select additive to start a new addition operation.
In the screenshot below I have marked out several areas in red, on the left you’ll see I have selected PMS as the addition.
On the right is the addition calculator; you will need to select the metric you want to use in the calculation (in this case, Free SO2).
If more than one additive uses this metric weighting, choose the additive you want to use.
Fill in the current rate if this metric has not been tested or has been invalidated in the system (via blending for example).
IMPORTANT: vintrace will calculate the delta from the current rate to the target rate. In our example, the delta is six. If you only enter the target rate, vintrace assumes you are going from zero to your target and will calculate a higher add. Pay particular attention to this factor to prevent adding too much sulfur or copper.
Fill in the desired rate and click Calculator.
Double check that the required amount looks right; if you are happy with the amount click [<<Use this value] to move the amount into the left hand side.